摘要
Abstract
The Aibinur Lake region has great position for its ecology and geography.As an essential indicator of soil quality,soil organic carbon (SOC) and its fractions play an important role in many soil chemical,physical and biological properties.A field experiment was conducted to determine the variation of soil nutri ents and soil active organic carbon under different land use patterns in Aibinur Lake region of Xinjiang.The results are as follows.The soil mechanical composition under different land use patterns was different,and the change trend of soil total porosity was contrary with the soil bulk density.The soil organic carbon,total nitrogen,total phosphorus and total potassium had the same change trends,which showed the order:forest land＞grassland＞cultivated land＞ unused land,while the soil total phosphorus had no significant difference under different land use patterns (p＞0.05).The easy oxidation of soil organic carbon (EOC),particulate organic carbon (POC),light fraction of organic carbon (LFOC),water soluble organic carbon (WSOC),soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) had the same change trends,which showed the sequence:forest land＞grassland＞cultivated land＞unused land.The ratios of EOC to SOC of forestland and grassland were higher than those in cultivated land and unused land which showed that the stability of soil organic carbon decreased in the progress of conversion of forestland and grassland to cultivated land.The ratios of MBC to SOC showed the sequence:forest land＞ grassland＞ cultivated land＞unused land,while the ratios in forestland and cultivated land had no significant difference (p＞0.05).Correlation analysis showed that soil active organic carbon components had a significant correlation with SOC,TN,TK,and EOC,POC,LFOC,WSOC and MBC had the extremely significant correlation each other (p＜0.05),which indicated that soil active organic carbon mainly depended on the organic carbon content to a large extent and active organic carbon influenced each other.In addition,the contents of SOC,TN,and TK were the important influencing factors on change in active organic carbon under different land use patterns in Aibinur Lake region of Xinjiang.关键词
艾比湖/土地利用类型/土壤养分/有机碳组分Key words
Aibinur Lake/land use patterns/soil nutrients/soil active organic carbon分类
农业科技
