摘要
本文应用除趋势对应分析方法（ＤＣＡ）对内蒙古草原中东部草原植被１２０个群落样地的分析表明：该区六种主要的草原群落类型在生境干燥度梯度上的顺序依次为：小针茅草原→短花针茅草原→克氏针茅草原→大针茅草原→贝加尔针茅草原和羊草草原。在上述分析基础上，研究了每种草原的群落组成、地上生物量及其种群结构，以及各类草原的理论载畜量。六种草原群落的地上生物量介于１１２Ｋｇ．ＤＭ．ｍ￣（－２）──１６２０Ｋｇ。ＤＭ．ｍ￣（－２）之间；相应地，理论载畜量变化于０．１０─１．５７羊单位／公顷。研究地区草原地上生物量（Ｂ）与年降水量（Ｐ）、年平均气温（Ｔ）和与≥１０℃的积温（Ｔａｃ）的关系分别为：Ｂ＝－１３４．９２＋０．８４Ｐ，Ｂ＝１３６．３７－２５．６８Ｔ，Ｂ＝３５１．６１－０．１２Ｔａｃ；与气候干燥度（依Ｐｅｎｍａｎ方法计算）的关系为Ｂ＝０．２６＋４．３３ｅ．
plots of steppe vegetation on the central-eastern part of Inner Mongolia plateauare analyzed by detrended correspondence analysis(DCA).The ordination of the six mainsteppe types on the gradient of aridity,in order from dry to humid,is along the sequence:Stipa Klemenzii steppe,S. breviflora steppe,S. krylovii S.grandis steppe and S.baicalensis steppe,Aneurolepidium chinense steppe has a wide ecological amplitude on thegradient. The community composition and population biomass are measured.The aerialbiomass of the steppe vegetation in the research area are 112-1620 kgDM,ha￣(-1). Accord-ingly,the carring capicity of the steppe rangelands are 0.10-1.75 sheep equivelent· ha￣(-1). The relations of steppe aerial biomass(B)with the annual precipitation(P),mean an-nual temperature(T)and the accumulated temperature(Tac> =10℃)are respectively:B=-134.92+0.84P,B=136.37-25.68T &B=351.61-0.12Tac,The relations withclimate aridity(A)are B=0.26+4,33e￣(8/a)
出处
《干旱区资源与环境》
CSCD
1994年第4期43-50,共8页
Journal of Arid Land Resources and Environment
