黄土高原小流域土壤养分的空间分布格局-Kriging插值分析
收稿日期: 2002-09-15
修回日期: 2002-12-20
网络出版日期: 2003-06-15
基金资助
国家自然科学基金重点资助项目(90102018);国土资源部科技项目资助(2001010104)
Spatial distribution patterns of soil nutrients in a small catchment of the Loess Plateau-Kriging method
Received date: 2002-09-15
Revised date: 2002-12-20
Online published: 2003-06-15
本文应用Kriging空间内插法,分析了黄土高原大南沟流域土壤有机质以及全N、全P、有效N和有效P等4种养分含量的空间分布格局。结果表明:土壤有机质呈现出坡上部低于坡下部的规律,其含量低于05%所占的面积最大,以耕地分布的区域为主,较高含量(06～08%)则分布在农果间作地和林地的区域;土壤全N的分布格局与土壤有机质具有相似性,只是坡下部的全N含量高于坡上部的趋势较为明显;土壤全P含量相差较小为138%,不同全P含量的空间分布面积基本相等;有效N和有效P并未表现出土地利用和景观位置控制的分布格局,有效P的空间分布较有效N更为复杂。
王军, 傅伯杰, 邱扬, 陈利顶, 余莉 . 黄土高原小流域土壤养分的空间分布格局-Kriging插值分析[J]. 地理研究, 2003 , 22(3) : 373 -379 . DOI: 10.11821/yj2003030014
Understanding the spatial distribution of soil organic matter (SOM) and soil nutrients is important for refining agricultural management practices and for improving sustainable land use Due to serious soil erosion and nutrient losses on the Loess Plateau, many researchers have studied the mechanism of soil nutrient loss and how to control soil nutrient loss, and nutrients in relation to land use and landscape position, and others have explored the distribution of soil nutrients described by classical statistical methods However, there is little information on spatial distribution patterns of soil nutrients using GIS and geostatistics in this area In this paper, based on spatial dependence of SOM, total N (TN), total P (TP), available N (AN) and available P (AP) through semivariogram of geostatistics, their distribution patterns using Kriging are explored in Danangou catchment The results are as follows: (1) Distribution pattern of SOM content exhibited its value in the upper slope less than that of the foot slope The area with SOM value less than 0 5% occupied the biggest proportion which mainly occurred in the farmland, and the scope with the value more than 0 6% had the smallest area where existed intercropping land and woodland (2)Spatial distribution of TN showed similar pattern to that of SOM, while the distribution of its value at the foot slope higher than the upper slope became more clear In addition, lower content (<0 035%)had the biggest connected area because of easy loss of N element (3) The areas with different TP contents (<0 056%, 0 056～0 059%, 0 059～0 062% and >0 062%) had almost equal proportion, because they tended to be controlled by soil parent materials and existed mostly in stable form in soil (4) Compared with SOM, TN and TP, AN and AP did not indicate the increasing value from the upper slope to the foot slope controlled by land use and landscape position, because of AP and AN direct absorption by plants and easy loss with soil and runoff The spatial pattern of AP was more complicated than that of AN
Key words： The Loess Plateau; soil nutrient; soil organic matter; Kriging
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