伊犁河谷不同土地利用方式下土壤有机碳含量与土壤理化性质相关性分析

Soil organic carbon content in relation to soil physicochemical properties under different land use types in the Yili Valley

通过对伊犁河谷地区四种典型土地利用类型（耕地,草地,园地和林地）0~60cm土层深度土壤有机碳含量与理化性质（速效氮、磷、钾,蔗糖酶活性,脲酶活性,过氧化氢酶活性）进行测定并分析土壤有机碳与理化性质的剖面分布特征及内在联系。结果表明：有机碳含量、速效氮、磷、钾、蔗糖酶、脲酶和过氧化氢酶的含量都随着土壤深度增加而降低。其中草地的有机碳含量、耕地的速效氮含量、园地的速效钾、速效磷含量、林地的蔗糖酶、脲酶、过氧化氢酶活性都高于其余三种土地利用方式。耕地的有机碳含量与速效氮、速效钾、速效磷和蔗糖酶活性在0.01水平上显著相关,园地的有机碳含量与速效氮、钾,脲酶和过氧化氢酶在0.01水平上显著相关,草地的有机碳含量与速效氮、磷、钾和两种酶活性（蔗糖酶和脲酶）呈极显著相关（P〈0.01）,林地的有机碳含量与速效钾,脲酶和过氧化氢酶呈极显著相关（P〈0.01）。

Soil organic carbon content from 0 to 60 cm and available nitrogen,available phosphorus,rapidly- available potassium,sucrase,urease and catalase was determined under different land use types in the Yili river Valley. Profile distribution characteristics of soil organic carbon,physical and chemical properties and intrinsic link were analyzed. The results show that organic carbon content,available nitrogen,available phosphorus and available potassium,sucrase,urease and catalase content decreased with increasing soil depth. The carbon content of grassland was higher than cultivated land,garden and forest land. The content of available N in cultivated land was higher than garden,woodland and grassland. The content of available potassium was higher than forest,farmland and grassland. The content of available phosphorus in garden was higher than cultivated land,woodland and grassland. Soil invertase,urease and catalase activity in forest were higher than in cultivated land,grassland and garden. The correlation between organic carbon and available N,available P,available K,and the activity of invertase was significant. The correlation between organic carbon and available N,available P,urease activity and catalase activity was significant. The content of organic carbon in grassland was significantly correlated with available nitrogen,available potassium,available phosphorus and two enzymes（invertase activity and urease activity）. The correlation between organic carbon in forest land and available potassium,urease activity and catalase activity was significant.