Quantitative analysis of soil pores under natural vegetation successions on the Loess Plateau  

作　　者：ZHAO ShiWei1,ZHAO YongGang1,2 & WU JinShui3 1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest Agriculture & Forestry University,Yangling 712100,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China 

出　　处：《Science China Earth Sciences》2010年第4期617-625,共9页中国科学（地球科学英文版）

基　　金：supported by Special-Fund Scientific Key Program of National Natural Science Foundation of China (Grant No.90502007);National Science & Technology Pillar Program in the Eleventh Five-year Plan Period (Grant No.2006BCA01A07);research progam of State Key Laboratory Foundation of Soil Erosion and Dryland Farming on the Loess Plateau (Grant No.10502-Z11)

摘　　要：Soil pore is a key attribute of the soil structure that affects soil reservoir under natural vegetation recovery on the Loess Plateau.This study is to quantitatively analyze soil pore parameters,measured with Computed Tomography(CT) at 15-57 mm depths under five different vegetation succession stages using a concept of substituting "space" for "time" in the Ziwuling Forest Region of the Loess Plateau.The results showed that the soil pore parameters,such as pore number,porosity,circularity,and fractal dimension,increased significantly under the natural vegetation successions and varied with the pattern climax community stage】pioneering arbor community stage】scrub community stage】herbaceous community stage】abandoned farmland stage,indicating that natural vegetation recovery could remarkably improve soil pore characteristics.With the vegetation succession,this positive effect will be strengthened gradually,which means that the soil pore parameters may appear to be best at the climax community stage.Soil organic matter content increased linearly with the soil pore parameters(P【0.001).Increased organic matter accumulation was one of the major reasons for the changes in soil pore characteristics in natural vegetation succession.Soil pore is a key attribute of the soil structure that affects soil reservoir under natural vegetation recovery on the Loess Plateau.This study is to quantitatively analyze soil pore parameters,measured with Computed Tomography(CT) at 15-57 mm depths under five different vegetation succession stages using a concept of substituting "space" for "time" in the Ziwuling Forest Region of the Loess Plateau.The results showed that the soil pore parameters,such as pore number,porosity,circularity,and fractal dimension,increased significantly under the natural vegetation successions and varied with the pattern climax community stage>pioneering arbor community stage>scrub community stage>herbaceous community stage>abandoned farmland stage,indicating that natural vegetation recovery could remarkably improve soil pore characteristics.With the vegetation succession,this positive effect will be strengthened gradually,which means that the soil pore parameters may appear to be best at the climax community stage.Soil organic matter content increased linearly with the soil pore parameters(P<0.001).Increased organic matter accumulation was one of the major reasons for the changes in soil pore characteristics in natural vegetation succession.

关 键 词：COMPUTED Tomography LOESS Plateau natural vegetation SUCCESSION SOIL PORE SOIL organic matter 

分 类 号：S154.4[农业科学—土壤学]