水土保持研究2018，Vol.25Issue(2)：58-65,71,9.
近30年南方丘陵山区耕地土壤养分时空演变特征——以江西省为例
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
摘要
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.关键词
耕地/土壤养分/空间自相关/克里金插值/时空变异/江西省Key words
cultivated land/soil nutrients/spatial autocorrelation/ordinary Kriging/spatiotemporal variability/Jiangxi Province分类
农业科技引用本文复制引用
张晗,李伟峰,赵小敏,朱美青,欧阳真程,郭熙,匡丽花,叶英聪,黄聪,汪晓燕..近30年南方丘陵山区耕地土壤养分时空演变特征——以江西省为例[J].水土保持研究,2018,25(2):58-65,71,9.基金项目
国家自然科学基金(41361049) （41361049）
江西省自然科学资助项目(20122BAB204012) （20122BAB204012）
土壤与农业可持续发展国家重点实验室(中科院南京土壤研究所)开放课题(0812201202) （中科院南京土壤研究所）
