关键词: 土壤活性有机碳（LOC）, 碳库管理指数（CMI）, 土地利用方式

Abstract: To explore the effects of different land use patterns on Soil Labile Organic Carbon（LOC）,Carbon Pool Management Index（CMI） and crop yields,selecting the arable land（T1）,grape land（T2）,jujube orchard land（T3） and vegetable land（T4） in Xinzheng city of Henan province as case object,to compare and analyze the variations of soil labile organic carbon and carbon pool management index under the 4 typical land use patterns（arable land,grape land,jujube orchard land and vegetable land）. The results indicated that,under different land use patterns,total organic carbon（TOC） of 0-60 cm soil layer existed obvious difference,and decreased with increasing soil depth,among them,TOC mass fraction of 0-20 cm soil layer differed greatly,T4,T3,T2 was increased 60.0%,53.3% and 13.3% than T1 respectively,and LOC and CMI were significantly improved compared with unused land（T0）. The crop yields was positively correlated with available nitrogen,carbon library activity （L） significantly（P<0.05）,but had no significant correlation with LOC and CMI, that may be caused by different statistical standards of crop yield. For the obvious different effects of different land use patterns on soil TOC,LOC and CMI,the LOC and CMI could be used as the evaluation index for different land use patterns and soil carbon pool quality.

Key words: soil labile organic carbon, carbon pool management index, land use pattern