天山南坡草地土壤因子与地下生物量的梯度变化研究  

Study on Gradient Changes of Soil Factors and Underground Biomass of Alpine Grasslands on Southern Slope of Tianshan Mountains

作　　者：王鑫[1,2] 胡玉昆[1] 热合木都拉·阿迪拉[1] 李凯辉[1] 高国刚[1,3] 

机构地区：[1]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [2]中国科学院新疆分院,新疆乌鲁木齐830011 [3]中国科学院研究生院,北京100039

出　　处：《中国草地学报》2008年第6期67-73,共7页Chinese Journal of Grassland

基　　金：新疆科技厅攻关计划项目(200533122)资助

摘　　要：对天山南坡高寒草地的土壤因子和地下生物量作了梯度分析和相关分析，结果表明：（1）土壤含水量和土壤pH值分别与海拔高度呈极显著正、负相关（r-0．941，r=-0．838），速效K与海拔之间存在显著负相关（r=-0．715）。（2）地下生物量随海拔的升高呈现降低-升高-降低的“∽”型分布趋势，并与海拔呈显著相关（r=0．763），与土壤含水量（r=0．803）、pH值（r=-0．897）呈极显著相关，与速效N呈显著相关（r=0．751）。（3）地下生物量主要集中在O～10cm深土层，这一土层的地下生物量占总地下生物量的79．5％，其分布自上而下呈倒金字塔型。Analysis and correlation analysis of soil factors and underground biomass of alpine grassland on southern slope of Tianshan Mountains were done. The results showed that： （1）Soil water content and soil pH value showed very significant positive and negative correlations with altitude（r= 0. 941, r=--0. 838） respectively, but there was a significant negative correlation between soil available K and altitude（r=--0. 715）; （2） Underground biomass showed decline--increase--decline＇s ＂∽＂distribution tendency, and significantly correlated with altitude（r=0. 763）, had fairly significant correlations with soil water content （r=0. 803） and soil pH value（r=-0. 897）, and it also had a significant correlation with available N（r= 0. 751） ; （3） Underground biomass mainly distributed in the soil layer of 0410 cm, in which underground biomass occupied 79.5% of total underground biomass, and it presented the top downward pyramid distribution from top to down.

关 键 词：高寒草地 海拔 土壤因子 地下生物量 

分 类 号：Q948[生物学—植物学]