supported by the National Natural Science Foundation of China(Grant No.39899370-03);Key Project of Chinese Academy of Agricultural Sciences;the Foundation of Red Soil Ecological Experiment Station of Chinese Academy of Sciences(2000-03).
Besides ruminant animals and their wastes, soil is an important regula ting medium in carbon cycling. The soil can be both a contributor to climate cha nge and a recipient of impacts. In the past, land cultivation has...