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[1]ZHANG Han,ZHAO Xiaomin,ZHU Meiqing,et al.Characteristics of Spatiotemporal Variability of Cultivated Soil Nutrients in the Southern Hilly Area of China in the Past 30 Years—A Case Study of Jiangxi Province[J].Research of Soil and Water Conservation,2018,25(02):58-65,71.

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Characteristics of Spatiotemporal Variability of Cultivated Soil Nutrients in the Southern Hilly Area of China in the Past 30 Years—A Case Study of Jiangxi Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 58-65,71 Column: Public date: 2018-04-03

Title:: Characteristics of Spatiotemporal Variability of Cultivated Soil Nutrients in the Southern Hilly Area of China in the Past 30 Years—A Case Study of Jiangxi Province

Author(s):: ZHANG Han^1,2, ZHAO Xiaomin^1,3, ZHU Meiqing^1,2, OUYANG Zhencheng^1,2, GUO Xi^1,2, KUANG Lihua⁴, YE Yingcong^1,2, HUANG Cong^1,2, WANG Xiaoyan^1,2, LI Weifeng; 1. Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology of Jiangxi Province, Jiangxi Agricultural University/Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Nanchang 330045, China;
2. College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China;
3. College of Public Administration, Nanjing Agricultural University, Nanjing 210095, China

Keywords:: cultivated land; soil nutrients; spatial autocorrelation; ordinary Kriging; spatiotemporal variability; Jiangxi Province

CLC:: S158.5

DOI:: -

Abstract:: This study aimed to understand the spatialtemporal evolution patterns of cultivated soil nutrients of Jiangxi Province from 1985 to 2012. The data were obtained from the second national soil survey (SNSS) in 1985 and the soil test and fertilizer recommendation in 2012 in Jiangxi Province. Classical statistics of SPSS, geo-statistics and semi-variance function of ArcGIS were used to process data, the global Moran’s I and ordinary Kriging method were applied to analyze the characteristics of spatiotemporal variability of TN, TP, TK, SOM and pH value of the cultivated soils during the past 30 years. The results showed that there were major differences in cultivated soil nutrients of Jiangxi Province from 1985 to 2012, global Moran’s I value and Nugget/Sill of soil nutrients presented as the strong positive spatial autocorrelation in 2012 compared with that in 1985. In 1985, the variograms of cultivated soil nutrients belonged to exponential model except that soil pH value fitted the spherical model. TN, TP, and SOM fitted the spherical model in 2012, while TK and pH value fitted the exponential model. All the results of cross-validation reached significant level during the two periods. During 30 years, cultivated soil nutrient contents of study area dropped or rose, showing the dominant rise as a whole. TN and SOM were at the high levels and the increases were particularly obvious, average grades increased 0.41 and 0.44 units, respectively. TP was at the middle level and the rise was more significant, average grade increased 0.39 units. TK was at the lowest level and the increase sharply dropped, average grade decreased 0.89 units. Soil pH value was at the acid level and dropped obviously, average grade decreased 0.66 units. In recent years, the increases of TN, SOM and TP contents, the decreases of TK content and pH value should be attributed to the effects of different tillage methods and fertilization, straw returning, industrial pollution, together with acid precipitation. The results of the study can provide theoretical supports and the scientific basis for soil regionalized soil nutrient management, high efficiency fertilization, soil nutrient sustainable utilization and cultivated land quality improvement in Jiangxi Province.

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