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草业科学  2015 

亚高寒草甸物种内稳性与生物量变化模式

DOI: 10.11829\j.issn.1001-0629.2015-0205, PP. 1539-1547

Keywords: 化学计量,生物量,亚高寒草甸,内稳性

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Abstract:

?植物的内稳性与其在群落中的生态策略和适应性密切相关,然而从物种或功能群水平探讨内稳性与其竞争力关系的研究非常有限。本研究以青藏高原亚高寒草甸为例,通过N添加、P添加及N-P共添加的方式,选取4个功能群的10个物种,探讨养分添加下生物量变化规律及物种内稳性差异。结果显示,N添加及N-P共添加促进生物量的积累,而P添加抑制群落生物量的积累,说明该地区主要限制类型为N限制;N添加、P添加及N-P共添加均促进禾本科植物生物量的积累,而降低豆科及杂类草植物的生物量,其中仅N添加增加莎草科植物的生物量;P添加下,禾本科植物P内稳性强于其他物种,P内稳性可能在禾本科植物的竞争力上起到重要作用;其他处理及N、N∶P比未表现出一般性规律。因此,养分添加条件下,内稳性差异在高寒草甸物种竞争中可能并非主导因素。

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