摘要
为分析典型黄土区土壤有机质横向和垂向分布,本文以典型黄土区少量采样点土壤信息和ASTER GDEM数据为基础,借助土壤-环境推理模型反演不同深度区域土壤有机质精细的空间分布信息,再对深度与有机质含量进行线性回归拟合,得到区域有机质垂向斜率(k)及判定系数(R2)的空间分布,最后与土地利用图叠加,利用局部G统计量剖析不同土地利用方式下土壤有机质的横向分布及垂向变异特性。结果表明,土壤-环境推理模型在本区域适用且精度较高;人类作用较多的土地利用方式下土壤有机质横向分布与垂向变异存在均一性,相反,自然作用较多形成的土壤,其有机质分布离差较大,较为复杂;横向与垂向综合分析可获取更为全面的土壤信息。
In order to analyze the horizontal and vertical distribution of soil organic matter(SOM)in typical loess area,this paper derives detailed regional soil matter distribution data of different depths using Soil-Land Inference Model(SoLIM)based on a few sampling nodes and ASTER GDEM data,and then gets the regression slope(k)and determination coefficients(R2)spatial distribution data using linear regression fitting method.Finally,overlay with land use map to analyze the horizontal and vertical SOM variation characteristics in different land use pattern using local G statistics.The results show that SoLIM is suitable in this area and has a good performance;the distribution of horizontal and vertical SOM is consistency in more human land use pattern and on the contrary is complicated and has big difference in more natural use condition;analysis both in horizontal and vertical perspective can obtain more comprehensive soil information.
基金
中国博士后科学基金项目(2012M510588)
