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OALib Journal期刊
ISSN: 2333-9721
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太白山土壤种子库储量与物种多样性的垂直格局
DOI: 10.11821/xb200406010, PP. 880-888
Keywords: 太白山,土壤种子库,物种多样性,海拔
Abstract:
通过野外植被调查和室内试验，从1220份土样中，挑选土壤中的种子，进行分类统计，研究秦岭太白山南坡土壤种子库储量与物种多样性沿海拔梯度的变化。研究结果如下(1)太白山南坡土壤种子库中的植物种为172种；从总体上看，土壤种子库中的物种丰富度(S)随着海拔的上升呈下降趋势。土壤种子库生物多样性特征表现为在2个海拔段发生较明显的变化一是从低海拔到中等海拔(1500~2500m)，二是从中等海拔到高海拔(2500~3500m)。在?琢多样性方面，生态优势度在海拔2500m处最大；在海拔2400m以下(包含2400m)的样地中，种子库生态优势度大于海拔2500m以上(含2500m)的样地种子库的生态优势度。H′(Shannon-Wiener指数)与生态优势度的变化趋势相反。(2)太白山南坡土壤种子库储量最大值出现在海拔2600m的样地，为2.24×104Ind./m2；种子库储量最小值出现在海拔3500m的样地，为4.43×102Ind./m2。储量沿海拔梯度的变化趋势表现为在海拔2600m以下，种子库储量沿海拔的上升呈逐渐增加的趋势；在海拔2600m以上，种子库储量沿海拔的上升呈逐渐下降的趋势。(3)土壤种子库的种子储量与种子密度的变化规律基本一致。而用单位面积土壤中的种子储量来表示种子库的大小特征比用种子密度来表示更为实用和方便，而且采集具有不同性质的土壤研究种子库，考虑到了土壤性质等因素的影响，更能客观反映土壤种子库的特点。
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