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植物研究  2015 

小兴安岭谷地云冷杉林林隙形成木特征及植物多样性

DOI: 10.7525/j.issn.1673-5102.2015.02.019, PP. 304-309

Keywords: 云冷杉林,林隙形成木,多样性,重要值

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Abstract:

?2013年6~8月,在小兴安岭凉水国家级自然保护区云冷杉林1.5hm2的固定标准地内,调查了所有林隙形成木的树种、基径、胸径、树高、折断高度、形成方式、腐烂等级以及草本植物、灌木的种类、多度、高度、盖度,并计算了它们的丰富度和重要值。结果表明:掘根倒木为36株,干中折断和干基折断倒木分别为17株和6株。就Shannon多样性指数(H)、物种均匀度指数(J)、Simpson生态优势度指数(D)而言,均为掘根样地>干中折断样地>干基折断样地。在掘根和折干样方内,东北羊角芹的重要值均最大,分别为14.2、13.2。掘根样方内的优势种为水金凤和荨麻,折干样方内的优势种为乌头。在相同倒木腐烂等级条件下,掘根样方的物种丰富度均大于折干样方。干基折断和干中折断草本层植物的丰富度在东、南、西、北样方内均小于对照样方的,而掘根样方内却相反。

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