The Distribution of Soil Labile Organic Carbon on Alpine Grassland Slope

Soil labile organic carbon is the most active part of soil organic carbon and plays a very vital role in the soil carbon cycle.With Dangxiong Tibet alpine grassland slope as research objects,we studied the distribution of soil labile organic carbon at different gradient of surface soil layer(0-10 cm).The results showed that soil labile organic carbon had less difference with soil total organic carbon,and the standard variations were separately between 0.0273-0.1642 and 0.0301-2.2835;the soil labile organic carbon accounted for 6% of soil total organic carbon;both soil labile organic carbon and soil total organic carbon increased with land gradient.The regression analysis showed that there was significant difference between soil labile organic carbon and soil total organic carbon(r=0.9383).The regression equation was y=0.0763x-0.4634.Soil labile organic carbon was positively correlated with soil clay content(y=0.0548x+ 1.4847),but this correlation didn't reach to the significant level(r=0.6488).Soil labile organic carbon could be explained by soil total organic carbon and soil clay content by 88.04% and 42.1%,respectively.