土壤学报2013，Vol.50Issue(1)：1-11,11.
徐淮黄泛平原土壤有机质空间变异特征及主控因素分析
SPATIAL VARIABILITY OF SOIL ORGANIC MATTER AND ITS DOMINATING FACTORS IN XU-HUAI ALLUVIAL PLAIN
摘要
Abstract
In an agricultural ecosystem,soil organic matter (SOM) is an index key to estimating soil C sequestration,soil fertility and quality,etc.Estimation of these soil properties at an acceptable level of accuracy is very important.In this research,a square area (116°45′32″～ 117°2′14″E,34°31′12″～ 34°45′6″N),about 580 km2,was chosen as an example in the northwest of the Xu-Huai alluvial plain (Xuzhou and Huaiyin).A total of 168 soil samples were collected according to nested scenario's,for analysis of SOM content and soil texture.And furthermore,spatial variability of SOM in the surface layer of this region was analyzed using the geostatistics and GIS method,and its dominating factors,too,by means of variance analysis and regression analysis.Descriptive statistics of the results shows that the SOM content of the region varying in the range of 21.80 ± 7.43 g kg-1 with a variation coefficient being 34.08％,both belonging to a moderate level.Geostatistical analysis suggests that the study area was very strong in spatial autocorrelation and structural factors played a dominating role in spatial variability of SOM,which was significant in anisotropy.The variation at 45° in direction was the most severe.SOM in the area was distributed in a band,decreasing from northeast to southwest.Variance analysis and stepwise regression analysis indicates that mechanical composition of the soil was the dominating factor,which alone could explain 64.9％ of the SOM spatial variability of the region,and land use,parent material and soil type followed in role.The four factors together could explain 74.6％ of the variability of SOM in the study area.关键词
土壤有机质/空间变异/影响因素/地统计学/逐步回归Key words
Soil organic matter/ Spatial variability/ Influencing factors/ Geostatistics / Stepwise regression分类
农业科技引用本文复制引用
赵明松,张甘霖,王德彩,李德成,潘贤章,赵玉国..徐淮黄泛平原土壤有机质空间变异特征及主控因素分析[J].土壤学报,2013,50(1):1-11,11.基金项目
江苏省基础研究计划项目(No.BK2008058)、科技部国际科技合作项目(No.2010DFB24140)、中国科学院战略性先导科技专项"中国农田土壤固碳潜力与速率研究"子课题"华东农田固碳潜力与速率研究(XDA0505050303)"资助 （No.BK2008058）
