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- Abstract：The application of plant growth regulators may alleviate some negative effects of drought stress.In order to examine the effects of a super water absorbent polymer (SAP) and fulvic acid (FA) on the soil water retention and water consumption during the crop growth,a pot experiment was conducted to study maize (Zea mays) growth,water consumption and water use efficiency by applying a SAP and FA under two soil moisture conditions in a greenhouse in 2011.The experiment included two levels of soil moisture (40%-50% and 70%-80% field capacity for drought and normal-water treatment conditions,respectively),two levels of SAP (0 and 0.9 g/pot),and four levels of FA.Each treatment had four replicates (0,0.6,1.2 and 1.8 g/pot) with soil collected from a maize field in Inner Mongolia.The results indicated that higher soil moisture significantly improved plant height,leaf area,grain number,dry weight,grain yield and harvest index,and these effects could be further improved with application of SAP and FA to the soil.In particular,the application of SAP alone reduced maize transpiration rate and increased production,and these effects increased with additional application of FA.At the most effective application rate of both SAP and FA (45 and 120 kg/hm2,respectively),a remarkably positive effect on reducing water consumption and improving water use efficiency in maize were achieved.Under low moisture content,the positive effect was even more obvious providing about 90% increase in the water use efficiency,and 50% increase in yield.Keywords：maize;super absorbent polymer;fulvic acid;water consumption;harvest index;water use efficiency5|9|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to determine the appropriate surface mulching measures in semi-arid areas,an experiment with randomized block design was conducted.The effects of four different soil surface mulching measures (including plastic film mulching,gravel mulching,animal manure mulching,straw mulching) and CK on soil water,temperature,the rate of emergence and maize growth in Yanchi County were investigated.The results showed that:1) Plastic film mulching and gravel mulching displayed good effects of increasing soil temperature which was conducive to the emerging,jointing and prolonging stages of crop development;2) Four soil surface mulching measures preserved the soil moisture,but the effect of animal manure mulching on soil water retention was the most significant;3) Four soil surface mulching measures increased plant height,stem diameter values,leaf area of maize at emergence,jointing,trumpet and heading stages of crop development;4) Four soil surface mulching measures increased the yield of maize,and the yield in the treatment of animal manure mulching was the highest,which followed by gravel mulching and the plastic film mulching compared to the CK.In conclusion,the appropriate surface mulching measure of maize is animal manure mulching followed by gravel mulching under the experiment condition.Keywords：maize;characteristics of soil hydro-thermal property;soil surface mulching;Yanchi County3|9|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to characterize the fatty acid metabolism variations during dormancy releasing and germination,GC-FID was adopted to analyse the fatty acid content in E.wushanense seed.The results showed that:1) Oil content of E.wushanese was 19.59%,wherein,3.28% was saturated and 16.31% was unsaturated;2) The content of the fatty acids decreased during both 10/20℃ and 4℃ stratification.However the content of linolenic acid increased during 4℃ stratification;3) There are differences in dynamic changes between content and relative content of the fatty acids at different stratification processes.The content of oleic acid and linoleic acid decreased while the relative contents increased during 4℃ stratification.Furthermore,the content of linoleic acid and linolenic acid were decreased while the relative contents were increased during 10/20℃ stratification;4) During 10/20℃ stratification,the fatty acid content was lower in 5 mg/L fluridone soaked seeds,indicating an acceleration effect of fatty acid metabolism by fluridone.Seeds soaked in fluridone were able to germinate during 10/20℃ stratification while the controlled seeds did not germinate at all.Significant difference of dynamic changes in fatty acids content was unobserved between 5 mg/L fluridone soaked seeds and the controlled seeds during 4℃ stratification.In conclusion,this study discovered the effects of fluridone and/or stratification temperature on E.wushanense seed and revealed the relationships among fatty acids during dormancy breaking by inspecting dynamic changes in fatty acids content.Keywords：gas chromatography;Epimedium wushanense;fluridone;fatty acid4|11|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：Screening for new varieties of white clover,the cutting seedlings of mutagenic white clover Haifa varieties by 60Co-γ,which had grown 64 d in pots,were treated with water stress for 21 days.The mutants were then evaluated by measuring the ground/underground fresh- and dry weight,chlorophyll,relative water content,water retention of leaves,MDA,electrical conductivity,soluble sugar and Pro.And the differences between the mutation and the original materials were compared.Besides,the materials' drought tolerance ability was evaluated by using the standard deviation coefficient of weight method.The results showed that 97 mutants were selected from 120 materials.Parameters excluding chlorophyll content and water retention of leaves,displayed significant differences (P<0.05).Through comprehensive evaluation, the comprehensive values of 41 mutagenic materials were greater than those of original material Ⅲ.It meant the drought tolerance of 41 materials was stronger than original material,and 4 extremely drought tolerance materials were identified (Ⅲ40-1,Ⅲ70-2,Ⅲ70-3 and Ⅲ70-5).Keywords：white clover;60;Co-γ mutagenesis;drought resistance mutants;screen5|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To investigate the function of RpoE2 in Brucella abortus,yeast two-hybird system was used to verify the interaction between RpoE2 and anti-sigma factor.Stress response assays were also performed to evaluate if the rpoE2 mutant tolerance to various stresses (oxidative stress,detergents,antimicrobial peptides,extreme pH,and iron limited).The survival ratios of rpoE2 mutant and WT in both J774A.1 cell and mouse infection model were also investigated.The results showed that RpoE2 interacted with anti-sigma factor,and the rpoE2 null mutant was not defective for the resistance to various stresses.Moreover,the survival ratio of all Brucella wild type strain and its mutant was almost the same in both macrophage and mice infection models.All these data demonstrated that RpoE2 was an ECF 16 sigma factor,and not involved in bacterial virulence in B.abortus.Keywords：Brucella abortus;ECF16 sigma factor;virulence;stress response1|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To illustrate the function of IGF-I and IGF-IR in leg muscle during chicken embryo development,fertilized eggs from Tibet chickens and Dwarf chickens were hatched and the leg muscle tissues of chicken embryo were collected at day 9,13 and 20.Real-time PCR was used to detect IGF-I and IGF-IR mRNA expression level.Furthermore,coding region of IGF-I was sequenced for searching the single nucleotide polymorphism (SNP) and then identified SNP was genotyped with RFLP in chicken population.The results indicate that the mRNA level of IGF-I and IGF-IR was significant higher in both day 9 and day 13 than day 20.The IGF-I mRNA expression was also significant higher at day 9 in relative to day13 in Tibet chicken while no obvious difference of the IGF-I mRNA was observed between day 9 and day 13 in Dwarf chicken.Furthermore,the expression pattern of IGF-I is similar to the IGF-IR during the Dwarf chicken incubation.The expression level of Tibet IGF-IR is higher in day 9 than day 13,but no significant (P>0.05).At day 9,the mRNA level of Tibet IGF-IR is higher than Dwarf chicken (P>0.05).In additional,a single nucleotide polymorphism c.282A>G was detected in coding region between Tibet and Dwarf chicken.In Tibet chicken,AG genotype was dominant which the frequency is 0.57 and GG genotype was dominant in Dwarf chicken which the frequency is 0.77.This study found that the mRNA level of IGF-I and IGF-IR in chicken leg muscle were significant higher at middle stage (day 9 and day 13) than late stage (day 20).The potential reason behind it is that development of leg muscle is faster at middle stage than late stage resulting to the mRNA level of IGF-I and IGF-IR changed.Keywords：chicken;IGF-I;IGF-IR;leg muscle;embryo;mRNA3|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To investigate the effects of Bacillus licheniformis on the growth performance and gut microflora in broiler chickens infected with necrotic enteritis (NE),a total of 240 one-day-old broilers were randomly divided into four groups:GroupⅠ(negative control),group Ⅱ(NE experimental model),group Ⅲ(chickens fed with diet containing 30% fishmeal and were infected with coccidiosis),group Ⅳ(NE group supplied with feed containing B.licheniformis).From day 14 onwards,chickens form groupsⅡ,Ⅲ and Ⅳ were given a diet containing 30% fishmeal and were given with coccidian on day 15.All birds in groupⅡand Ⅳ were fed with C.perfringens(2.2×108 CFU/mL) through oral gavage from day 18 to day 20.The trial lasted for 22 days.The results showed that:Necrotic enteritis reduced the bodyweight gain significantly and impaired feed weight ratio (P<0.05);Dietary supplementation with B.licheniformis increased the bodyweight gain of broilers;Clustering analysis of ileum microflora by DGGE indicated two clusters were formed,and the similarity reached 0.70;Moreover,compared with group Ⅱ,the amount of Lactobacillus spp.was significantly higher in group Ⅰand Ⅳ(P<0.05),and the amount of Enterobacteriaceae family was significantly lower in group Ⅰ(P<0.05) and Ⅳ and no significant difference was found compared with groupⅠand Ⅳ(P>0.05).Therefore,dietary supplementation with B.licheniformis could improve the growth performance of broilers and adjust the imbalance of flora caused by NE.Keywords：Bacillus licheniformis;broiler;necrotic enteritis;growth performance;gut microflora2|10|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：Epidemiological investigation and routine pathological observation were conducted to study onchocerciasis in camels for better prevention of disease caused in camels.The results showed that the infection rate of Onchocerca of camels was 85.4 percent on average in Inner Mongolia and a mean intensity of 1-15 nodules/host.Nodules containing the worms were observed from nuchal ligaments of camels.A total of 209 nodules were collected and their shape and texture were different.Soft nodules consisted of fibrous capsules and hard nodules formed calcification.The distribution of nodules showed different patterns with the age of the camel.Histologically,inflammatory cells around compartments and cavities contained different status of females.Camels' onchocerciasis caused parasitic granuloma.Keywords：Onchocerca fasciata;camel;prevalence;histopathology0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to select additive from 8 kinds of additives and its optimal concentration,different concentrations of vitamin B1,riboflavin,nicotinamide,adenine,D-calcium pantothenate,folic acid,cobalamin,mixture of glycine and adenine were added to liquid fermentation broth,and the effects of these additives on cordycepin production by Cordyceps militaris mycelia were detected by HPLC.The results showed that four additives promoted cordycepin production significantly.These additives were mixthure of glycine and adenine (14 and 2 g/L),adenine (2 g/L),riboflavin (1 g/L),D-calcium pantothenate (2 g/L).Vitamin B1 and cobalamin were less effective additives while nicotinamide,and folic acid inhibited cordycepin production.The mixture of glycine and adenine (14 g/L and 2 g/L,respectively) was the best of 8 kinds of additives where the production of cordycepin reached 300.868 μg/mL.Synergism effect was strongest of all ratios when the concentration ratio between glycine and adenine was 7:1.Glycine and adenine promoted meterials production of biosynthesis of cordycepin through denovo and salvage pathway,respectively.Keywords：Cordyceps militaris;trace additives;liquid fermentation;cordycepin3|9|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：The averaging methods of parameters in Richards equation can affect numerical simulation results of water movement in layered soil.The infiltration process of layered soil column under ponding condition is simulated with MATLAB software and compared the simulation results of eight different averaging methods.The results show that there exists a negative correlation between the arriving time of wetting front and the increasing rate of soil volumetric water content at a certain soil depth.The simulated soil water content has great numerical fluctuation for the averaging methods of indirect arithmetic mean and harmonic mean.Geometric mean and triadic mean have the minimum error for simulating infiltration rate,cumulative infiltration and wetting front.In conclusion,geometric mean and triadic mean are more suitable for simulating ponded infiltration in layered soil column.Keywords：soil water logging;infiltration parameters;averaging methods;layered soil with sand interlayer;numerical simulation;MATLAB0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：A small pilot plant was built to simulate Liaohe river estuary natural reed wetland in comprehensive test venue at Shenyang Agricultural University and investigate the variation of total phosphorus content in soil and reeds at different growth stages.The results show that:Under different concentrations of wastewater irrigation,with the increase of soil depth,changes of soil total phosphorus content displayed the same trend,and the highest total phosphorus content existed at 5-10 cm soil layer.Soil phosphorus content in waste water irrigation group distribution in soil profiles was:0-5 > 5-10 > 20-40 > 40-60 > 10-20 cm.Total phosphorus content variation irrigation concentration reached maximum at 300 mg/L soil treatment and minimum at 175 mg/L.Reeds growing trend with the total phosphorus content was mature > jointing stage > heading stage > leaf stage > germination stage.Irrigation group reeds phosphorus content was higher than in control group,and its content distribution in the reed was stem > leaf > root > ear.Correlation analysis showed that soil total phosphorus,total nitrogen,total phosphorus organic matter and reed showed significant positive correlation while the correlation between pH and total phosphorus was not significant.Keywords：paper wastewater;irrigation methods;wetlands;reed;total phosphorus0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to investigate the influence of reclaimed water irrigation under different nitrogen fertilizers on greenhouse gas emissions from winter wheat soil,an orthogonal experiment was conducted with reclaimed water and groundwater of different inorganic fertilizers (urea,amine fat,slow-release fertilizer).The impacts of different experimental treatments on winter wheat yield and emissions of greenhouse gases from the soil were analyzed.The results showed that:The treatment of reclaimed water as opposed to groundwater,the average of daily CO2 flux form soil increased by 4.78%-29.93%.The average of daily N2O flux form soil was increased by 17.48%-32.50%;Fertilized treatment by urea,ammonium sulfate and slow-released fertilizer was compared with no fertilizer,the average of daily CO2 flux increases 14.037%,13.230% and 7.353%.And the average of daily CO2 flux increases 81.4%,99.2% and 39.8%;The irrigation of reclaimed water can increase the yield of winter wheat 3.58%;Significance analysis showed that reclaimed water had no significant effect on the emission of CO2 from the soil (P>0.05) and affected N2O emission flux significantly (P<0.05).In conclusion,the type of fertilizer and water quality had no significant effect on the yield of winter wheat.Keywords：greenhouse gas;reclaimed water;fertilizer;yield3|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to examine the reliability and precision of dual-wavebands spectrometer CGMD-302,this study tested wheat canopy morphology by using hyper-spectrometer UniSpec SC and dual-wavebands spectrometer CGMD-302 simultaneously and analyzed linear relationships between vegetation index NDVI,RVI,DVI,and leaf area index (LAI) and leaf dry weight (LDW) quantitatively.Date analyses showed that both vegetation indices from UniSpec SC and CGMD-302 could monitor the growth condition of winter wheat.A linear relationship model was established between vegetation indices by dual-wavebands spectrometer and growth parameter.In the model of vegetation indices and LAI,the determination coefficients (R2) were not less than 0.891,with root mean square error (RMSE) and relative error (RE) not more than 0.792 and 0.225 respectively.In the model of vegetation indices and LDW,the R2 was not less than 0.85,with RMSE and RE not more than 440 kg/hm2 and 0.239 respectively.It was found that the nitrogen fertilizer 270 kg/hm2 not only guaranteed the yield but also took the quality into account,which can be used as the appropriate amount of nitrogen fertilizer.Under appropriate nitrogen fertilizer,wheat suitable leaf area index at jointing and booting stages were respectively 3.65±0.09 and 5.95±0.32 respectively;And the appropriate leaf dry weight were respectively 1 554±168 kg/hm2 and 2 231±130 kg/hm2.With the CGMD-302 monitoring model,suitable vegetation index interval of canopies could be calculated at jointing and booting stages of winter wheat.1|11|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to tackle the problem of color distortion caused by atmospheric dust,a method based on optical imaging model is developed to restore the color of leaf image.The model considers the optical characteristics of reflection and scattering of a dust layer.The parameters of model are estimated as follows:The dust reflectance is calculated according to the reflection characteristics of black part of dusty ColorChecker Chart,and the incident optical intensity and transmittance are estimated by dark channel prior and wavelet transforms.The images of dusty ColorChecker Chart and grape leaves are employed to check the effectiveness of the algorithm.The results show that the method can significantly reduce the mean absolute error of a and b color components of CIE Lab color model of the degraded images,effectively enhance their contrast and quality.The results also indicate that the method is applicable to images under various conditions such as weather,illumination and grape varieties.Keywords：leaf image;image degradation model;optical imaging model;color restoration0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to analyze the space robustness of Venlo greenhouse structure,five calculation models of Venlo greenhouse structure including single frame,whole frame,whole frame with membrane covering,whole frame with plate glass covering and whole frame with PC board covering,were established by using finite element analysis software ANSYS with consideration of the actual working condition,material nonlinearity,geometric large deformation and geometric imperfections.The overall mechanical behavior of the five models under five wind and snow load cases was obtained,respectively.At the same time their safety coefficient and space robustness coefficient were provided,and the space robustness of Venlo greenhouse structures were analyzed.The results showed that purlin support enhanced space robustness of greenhouse structure by 0-33.7%.The effect of covering material on enhancing space robustness of whole frame was significant,which was about 28.1%-383.4% enhancement.Among them,plate glass covering was the most favorable to the space robustness of greenhouse structure,PC board was the second and membrane is the least.The research can provide information for designing Venlo greenhouse structure.Keywords：Venlo greenhouse;stable bearing capacity;space robustness;numerical simulation0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To study the spatial distribution of soil nutrients in 2019 Beijing International Horticulture Exhibition site,top soil samples (0-20 cm) were collected in a 200 m×200 m grid and a total of 85 samples were taken within the 960 hm2 exhibition area of Beijing International Horticulture Exhibition site,analyzed for values of pH and concentrations of soil organic matter (SOM),total nitrogen (TN),available nitrogen (AN),available phosphorus (AP),available potassium (AK),available Fe (AFe),available Mn (AMn),available Cu (ACu) and available Zn (AZn).Descriptive statistics and geostatistics were used for data analyzes.The results showed that:The pH value of the soil was strongly alkaline (pH=8.76).Contents of SOM,TN and AK were at medium level;Contents of AN and AP were at lower level;Contents of AFe,AMn,ACu and AZn were at higher level.The spatial variation characteristics of all elements were analyzed by the geographic information system Kriging method.The conclusions were:The content distribution of SOM,TN and AN were mainly affected by topology factor,which decreased from the river bank to both coasts;AP decreased from north to south;AK content distribution was uniform;Available microelements regional distributions was affected by terrain and human factors.According to the spatial distribution of soil nutrient,2019 Beijing International Horticulture Exhibition site was classified as ‘Low level fertility zone in the east’,‘High level of fertility in the middle’,‘Low level fertility zone in the forest park’ and ‘Low level fertility zone in the west’.This study will provides a scientific theoretical basis for next step planning,landscape design,plant disposition and maintain of the exhibition area.Keywords：soil nutrients;Beijing International Horticulture Exhibition;semivariance;spatial distribution0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To provide references to guide planning and design of "Sponge City" scientifically,and from the prospectives of urban hydrologic cycle and stormwater managements and technology,three key elements (plant interception,soil infiltration and permeable pavement infiltration) were put forward.And the ecological function and influence factors of plant interception,influence factors of soil water infiltration,and the structure and infiltration ability of permeable pavement on the aspect of Sponge City construction in small scale were reviewed.The potential and function of stormwater retention and management of the three elements were then described.Finally,attention and research direction of future applications of the three elements were proposed respectively for promoting stormwater management capacity.Keywords：stormwater management;hydrological cycle;canopy interception;soil infiltration;permeable pavement2|11|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：The transition of farmland management patterns in China,which is shifted from decentralized and extensive operation to scale and intensive operation,is not only the key to improve the grain yield,but also one of the most important components in modern agricultural development and new-type urbanization.For this reason,an quantitative analytic method and analytic hierarchy process based on the fundamental connotation of cultivated land management mode are established to explain the evolution of rural land management patterns in 1999-2008 at provincial level. And factor analytical method and cluster analysis method are then adopted to illustrate the driving forces and development tendency of the transition of land management mode.The results demonstrated that:1) The farmland management patterns changed obviously during the period from 2004 to 2013.The areas which were under decentralized and extensive land operation type have a faster growth,while the scale and intensive areas have a relatively flat growth.Meanwhile,the extent of intensification and scale-degree in east region of China is higher than in the west,and the south region is higher than in the north region.2) The results of factor analysis show that the driving forces of the transition of farmland management patterns focus on four dimensions,including nonagricultural economic development level,natural resources,agriculture science development level and labor educational level.The first two factors play a leading role among all driving forces.3) The developing tendency of farmland management patterns of 31 provinces in China are aggregated into four regions,including steady development area,intensive and scale development area and special cases area.Keywords：farmland;management patterns;transition;intensity;scale-degree;spatial-temporal variance0|10|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to determine ecological diffusion range and reception range of cities around Yangtze River economic belt,bivariate spatial analysis method was applied to analyze the land use structure and economic environment.Overlay analysis was conducted on abnormal areas extracted and these areas were divided into the diffusion center or reception center of the ecological effects caused by land use.The results showed that land use structure had certain impacts on surrounding cities.The urban land and agricultural land had a positive effect on economic development,while ecological land displayed a negative effect on economic development.The area of high urbanization and economic development was the main region for ecological demand,while the area of high ecology and economic development was the main region for ecological diffusion.Keywords：land use;ecological effect;ecological diffusion;cities around Yangtze River economic belt;spatial analysis0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：Taking Ulanqab City as an example,the intensity attribute and influence influential factors of scale arable management of potato planting ordinary households and potato planting scale households land were investigated by using mathematical statistics methods.The results showed that the scale households were significantly higher in input and output levels than those of the ordinary households, but was significantly lower in cultivated land's sustainable utilization level than that of the ordinary households.On the whole,the intensity degree of cultivated land of the scale households was 4.84 times of the ordinary households. Main factors affecting the scale households cultivated land intensity degree included household age (negative correlation) and home loan amount (positive correlation).Main factors influencing the ordinary farmers cultivated land intensive degree included annual household income (positive correlation),family farming income (negative correlation) and loan amount (positive correlation).Keywords：cultivated land;intensity;ordinary households;scale households;factor0|7|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To evaluate the energy efficiency of five main grape producing areas in China,a fusion method based on Data Envelopment Analysis and Stochastic Frontier approach (D&S) is applied to evaluate the energy efficiency of grape production in this study.Different models were analyzed and validated.The results showed:The energy efficiency value of Shandong,Jilin,Anhui,Gansu,Shaanxi provinces was 1,while the value of Ningxia,Jiangsu and Yunnan was the lowest;Energy efficiency of grape in northern region was higher than in the southern region ranking North China,Northeast,Northwest,South China,Southwest;The energy efficiency calculated in D&S and DEA method displayed remarkable consistency.The D&S method avoided the deviation caused by production function setting and the parameter distribution compared with SFA method.And it preserved better stability compared with the traditional DEA method.In conclusion,D&S method is a reasonable and better energy efficiency evaluation method.Keywords：grape;data envelopment analysis;stochastic frontier analysis;fusion method;energy efficiency0|8|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：To explore the knowledge structure of land resource management,discipline construction conditions,research hotspots and trend of land resource management discipline development in the future,and to adapt to the new era of the discipline construction in China.Frontier and current hotspot evolution was investigate,and the distribution of time and journal characteristics,and research academic institutions,social network structure in the evolution of system analysis was revealed based on the informetrics of visualization software CiteSpaceⅢ by taking CSSCI as the data source,for the first time using the term words analysis,keywords co-occurrence network,etc.The results showed that:1) The domestic scholars' research on land resource management,mostly in environment and geography,was in consistent with that of scholars abroad.And the number of papers written by Chinese scholars has been rising steadily.2) At present,the field of land resources in China had formed a relatively complete basic theory research system,land use,land management and land planning were the main focus of the domestic development and the field of knowledge groups.3) Researchers had initially formed a relatively close cooperation group,but there were still half researchers were in the state of independent research.4) In front of the evolution process,as a starting point of "Land use",the evolution of land resource management research has been along the continuum of "generation-adaption-application".The subject of land resource management had changed to regional and multi-dimensional problem studies from macroscopic and passive research areas.In the follow-up study,we should strengthen practical application by combining the theoretical basis and the practical case and constantly improving the level of the researchers.Keywords：land resource management;evolution of subject;visualization;map of knowledge;CiteSpace0|9|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
