应用土壤-景观定量模型预测土壤属性空间分布及制图

以土壤-景观定量模型为基础的土壤制图方法在世界范围内得到了广泛研究。本文在皖南宣城的丘陵地带内选择研究区,从该区的数字高程模型(DEM)中获取景观信息:地形因子,定量地分析了土壤属性与地形因子之间的相关关系,并建立基于该关系的线性土壤-景观定量模型,最后应用该模型来预测土壤属性在空间上的分布并制图。结果表明:土体厚度和表层有机质含量与地形因子之间有着显著相关性;建立的线性回归模型分别能解释土体厚度、表层有机质含量空间变异的32.2%和35.3%;依据该模型预测的土体厚度和表层有机质含量具有较高的准确度,并能制图表达土壤属性在空间上的自然连续性。

Prediction and mapping of spatial distribution of soil attributes by using soil-landscape models

Soil mapping based on quantitative soil-landscape model has been studied all over the world.This paper chose a hilly area in Xuancheng,southern part of Anhui province,as the study site,and produced soil mapping based on quantitative soil-landscape models relying on quantitative relationships between soil and landscapes.The results showed that there were strong correlations between solum thickness,organic material content in topsoil and some of topographic indexes.Quantitative soil-landscape models could explain 32.2% and 35.3% of the spatial variations of solum thickness and organic content in topsoil,respectively.The predicted values of solum thickness and organic content in topsoil on validation points by the two soil-landscape models matched the determined in a high degree.Additionally,the maps produced by the two soil-landscape models kept the natural spatial continuity of soil properties,which cannot be captured on traditional soil maps.