水成土壤演化中有机质含量变化的研究  

STUDY ON CHANGES IN ORGANIC MATTER CONTENT IN THE SUCCESSION OF HYDRO-MORPHJC SOILS

作　　者：董元华[1] 徐琪[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《生态学报》1990年第4期323-327,共5页Acta Ecologica Sinica

摘　　要：本文研究了湖北四湖地区和江苏里下河地区沼泽化的湖泊、沼泽与稻田生态系统演化中土壤有机质含量的变化规律及其同还原能力的关系。结果表明,土壤有机质含量的变化极有规律。从湖泊生态系统演化为沼泽生态系统时,土壤有机质含量显著增高。四湖地区表层土壤由3.80％增加到10.1％,里下河地区亦由4.32％变为14.4％。而当沼泽被开垦利用,演化为稻田生态系统时,土壤有机质含量又迅即下降,并随着开垦时间及土壤脱沼程度的增加,而下降的幅度增大。四湖地区初期脱沼土表层土壤下降了35％,脱沼土则下降了47％,里下河地区亦下降58％。潜育层土壤有机质含量的变化趋势与之相似,土壤的还原能力与有机质含量呈密切的正相关。Changes in organic matter content of surface and gleying horizon soils in the succession of wetland ecosystems were studied, which are from senile lake to swamp and rice fields in Four Lake region and Lixiahe region of China. In addition, the relation between organic matter content and reduction potential was also studied with incubation experiment. The results are as follows:The organic matter content of soil increased sharply in the succession from senile lake to swamp, and decreased significantly in the succession from swamp to rice fields, developsment with of soil deswamping, the degree of reduction was more remarkable.The organic matter content in surface horizon increased from 3.80% to 10.1% in Four Lake region, and from 4.32% to 14.4% in Lixiahe regoin after senile lake became swamp, but declined by 35 per cent in younger deswamping soil, by 47 per cent in deswamped soil in Four Lake region, and by 58 per cent in deswamped soil in Lixiahe region. The changes in organic matter content in gleying horizon were similar to surface horizon,but the degree of decrease was greater than surface horizon in deswamped soil, and slighter than surface horizon in younger deswamping soil.The date from incubation experiment indicated that the reduction potential was in a close relation to content of organic matter. Organic matter content was negative correlation with Eh value,and positive correlation with reductive substances.

关 键 词：水成土壤 有机质 土壤演化 

分 类 号：S154.1[农业科学—土壤学]