Effects of Long-term Micro-area Experimental Simulation of Differ-ent Land Use Patterns on Composition of Organic Carbon and Hu-mus in Black Soil
In order to explore the changes of soil organic carbon and humus components in bare land(BS),natural vegetation growth land(NG),straw returning bare land(BS+CS)and straw returning corn land(CS),black soil under 12 years of long-term micro area experimental treatment in the black soil area of Jilin Agricultural University was used as research object to study the effects of different land use patterns on organic carbon and humus components of black soil.The results showed that the order of soil organic carbon content was NG＞CS＞BS＞BS+CS,and natural vegetation growth and straw returning to corn land were beneficial to increasing soil organic carbon content.The content of HE,HA,FA and HM in NG soil was higher,followed by HA in CS soil.The proportion of humus components to organic carbon in different land use patterns was:fulvic acid carbon(FAC)＜humic acid carbon(HAC)＜humin carbon(HMC).The degree of humification of CS soil was the largest in the surface layer,and the degree of humification of BS in the subsurface soil was significantly accel-erated.NG was beneficial to the increase of HA proportion in soil organic carbon of the surface soil,while NG was not conducive to increasing the relative content of FA in the surface soil.CS treatment was higher than BS treatment.The relative content of FA in the subsurface soil of natural vegetation growth areas(NG)decreased,while straw returning to corn land(CS)increased the relative content of soil HM.In general,grassland and straw returning land are beneficial to the increase of carbon con-tent in soil organic carbon and humus components,accelerating the process of soil humification,but not conducive to increasing the proportion of soil humus in soil organic carbon.
万方数据
维普
