拉萨河中下游河谷自然土壤有机质空间变化特征研究  

Research on spatial variation characteristics of natural soil organic matter in the middle and lower reaches of Lhasa River Valley

作　　者：次仁[1] 赵茜茜 孙永明 Tsering;ZHAO Xixi;SUN Yongming(School of science,Tibet university,Lhasa 850000,China)

机构地区：[1]西藏大学理学院,西藏拉萨850000

出　　处：《高原科学研究》2020年第1期1-7,共7页Plateau Science Research

基　　金：青藏高原第二次科考之:西藏大学一江四河科学考察项目。

摘　　要：通过对拉萨河中下游河谷土壤进行采样,测定该区域土壤中的有机质含量和空间分布特征。研究结果表明:拉萨河谷中下游地区土壤有机质含量偏低;土壤有机质的变化受到多种因素影响,其中海拔变化是引起有机质变化的最主要因素,水热条件在不同环境下的分异也会引起土壤有机质含量变化,水分条件与土壤有机质含量呈正相关,热量条件与土壤有机质含量呈负相关;当地植被覆盖度与土壤有机质含量呈正相关;采样点所处地形部位坡度不同也会引起土壤有机质含量的变化。The organic matter content of the soil sampled in the middle and lower reaches of the Lhasa River Valley and its spatial distribution characteristics were studied. The results show that the organic matter content was low in the soil samples from the lower and middle reaches of Lhasa River Valley and the changes in organic matter content have been influenced by many factors. Altitude is the most important factor influencing organic matter content in the soil and the various hydrothermal conditions at different environments can also cause the changes of the soil organic matter content. The water condition and local vegetation cover were positively correlated with the soil organic matter content, but the heat condition was negatively correlated with the soil organic matter content. The different slopes of the terrain at the sampling points could also cause changes in soil organic matter content.

关 键 词：土壤有机质 空间变化 拉萨河谷 

分 类 号：S151.9[农业科学—土壤学]