Amendment of Acid Soils with Crop Residues and Biochars  

作　　者：YUAN Jin-Hua XU Ren-Kou WANG Ning LI Jiu-Yu 

机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing210008 (China) [2]Graduate University of Chinese Academy of Sciences, Beijing 100049 (China)

出　　处：《Pedosphere》2011年第3期302-308,共7页土壤圈（英文版）

基　　金：Supported by the National Key Technology R&D Program of China (No.2009BADC6B02);the National Natural Science Foundation of China (No.40971135)

摘　　要：The liming potential of some crop residues and their biochars on an acid Ultisol was investigated using incubation experiments. Rice hulls showed greater liming potential than rice hull biochar, while soybean and pea straws had less liming potential than their biochars. Due to their higher alkalinity, biochars from legume materials increased soil pH much compared to biochars from non-legume materials. The alkalinity of biochars was a key factor affecting their liming potential, and the greater alkalinity of biochars led to greater reductions in soil acidity. The incorporation of biochars decreased soil exchangeable acidity and increased soil exchangeable base cations and base saturation, thus improving soil fertility.The liming potential of some crop residues and their biochars on an acid Ultisol was investigated using incubation experiments. Rice hulls showed greater liming potential than rice hull biochar, while soybean and pea straws had less liming potential than their biochars. Due to their higher alkalinity, biochars from legume materials increased soil pH much compared to biochars from non-legume materials. The alkalinity of biochars was a key factor aflecting their liming potential, and the greater alkalinity of biochars led to greater reductions in soil acidity. The incorporation of biochars decreased soil exchangeable acidity and increased soil exchangeable base cations and base saturation, thus improving soil fertility.

关 键 词：ALKALINITY exchangeable base cations inorganic N liming potential soil acidity 

分 类 号：S156.6[农业科学—土壤学] X592[农业科学—农业基础科学]