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草业学报  2015 

围封沙质天然草地植物的构件和个体生物量比较研究

DOI: 10.11686/cyxb2015048, PP. 206-215

Keywords: 个体生物量,构件生物量,根冠比,围封,沙质草地

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Abstract:

生物量是植物积累能量的主要体现,其在各器官中的分配是植物对环境适应的结果,反映了植物的生长策略。调查甘肃省景泰县绿洲边缘围封沙质草地常见的27种灌木和草本,采用全挖法研究了各植物盛花期时的个体和根、茎、花、叶等构件的生物量特征以及地下-地上生物量关系(根冠比,R/S)的变化趋势。结果表明:1)27种植物中,花、叶、茎干重小于1.0g的分别占到89%,70%,56%,27种植物的根冠比均小于1;2)随着封育措施和人工抚育措施的实施,4种灌木的根冠比(R/S):沙蒿(均值为0.32)、猫头刺(均值为0.78)、荒漠锦鸡儿(均值为0.24)和白刺(均值为0.10)在各样地中表现出显著差异性;3)大部分植物构件对地上生物量的贡献率为:茎>叶>花>根,植物构件对个体生物量的贡献率为:叶>茎>花>根;一年生草本地上(花、叶、茎)生物量与个体生物量的比率显著高于多年生草本和灌木(P<0.05),不同构件对生物量贡献率的差异有利于不同生活型植物的种群扩散和繁衍。

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