贺兰山西坡草地植物多样性与其叶片C∶N∶P计量比的关系  

Relationship between Grassland Plant Diversity and Foliar C∶ N∶ P Stoichiometry on the Western Slope of the Helan Mountain

作　　者：江世高[1] 尚振艳[1] 牛得草[1] 张宝林 张斯莲 傅华[1] 

机构地区：[1]草地农业生态系统国家重点实验室、兰州大学草地农业科技学院,甘肃兰州730020 [2]内蒙古阿拉善盟草原总站,内蒙古巴彦浩特750306 [3]内蒙古阿拉善盟气象局,内蒙古巴彦浩特750306

出　　处：《干旱区研究》2014年第3期523-529,共7页Arid Zone Research

基　　金：中国科学院战略性先导科技专项“应对气候变化的碳收支认证及相关问题”(XDA05050406-8);国家科技基础性工作专项(2012FY111900);国家自然科学基金(31070412);兰州大学中央高校基本科研业务费专项资金(lzujbky-2012-98);高等学校博士学科点专项科研基金(20120211110029)资助

摘　　要：植物生态化学计量学特征的地理学分布规律及其影响因素的研究是生态学研究的热点问题之一。以贺兰山西坡不同海拔高度7个群落为对象,研究群落物种多样性与植物叶片碳（C）∶氮（N）∶磷（P）计量特征的关系。结果表明：贺兰山低海拔区域,植物群落物种丰富度与群落植物叶片N∶P及其变异系数间无显著相关关系,没有支持＂群落植物叶片N∶P介于14～16时,群落植物丰富度最高;N∶P〈14或N∶P〉16时,群落植物丰富度均较少＂的模型,以及＂群落植物丰富度与群落植物叶片N∶P变异系数正相关＂的假设。其原因在于所调查样地群落植物丰富度均较低,且各样地物种丰富度相对集中,梯度较小（9～16种）。In recent years, the geographic variation in the plant stoichiometry has become as the center of stud- ying the structure and function of ecosystems with global climate change. This resarch explored the relationship between the biodiversity and the foliar stoichiometry （ C, N and P contents） in 7 different plant communities at different altitudes on the western slope of the Helan Mountain. The results showed that the species richness in plant comunity was decreased with the increase of elevation in low-altitude areas in the Helan Mountain, and there was no significant correlation between the species richness in plant community and the foliar stoichiometry （C, N and P contents and stoichiometric ratios and coefficients of variation of these indicators） in the Helan Mountain, which did not surpport the viewpoint that the value of species richness was higher when the foliar N： P mass ratio varied in a range of 14 - 16 than that when the foliar N： P mass ratio was higher than 14 or lower than 16, and the hypothesis that there was a positive correlation between the species richness and the variance of foliar mass ratio was surpported neither. Such results may be caused by the slight change of plant species richness in our research （9 - 16 plant species）.

关 键 词：生态化学 植物群落 多样性 植物组织 养分含量 贺兰山 

分 类 号：Q948[生物学—植物学]