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-  2015 

三峡库区香溪河消落带植物群落构成及物种多样性 Floristic Composition and Plant Community Diversity of Water-Level Fluctuation Zone Along Xiangxi River,Three Gorges Reservoir Area

Keywords: 三峡库区,香溪河消落带,简化重要值,物种多样性

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Abstract:

通过对三峡库区香溪河消落带145~175m范围内植物群落的调查,研究了三峡水库低水位运行期间消落带植物群落构成和物种多样性.采用以植物所占体积(盖度乘以高度)表示的简化重要值(SIV)代替传统方法计算物种多样性.结果表明:调查共记录维管植物23科49属50种,以禾本科种类最多,菊科次之,为消落带优势科,绝大部分是1属1种的草本植物;一年生草本植物为消落带优势生活型,一年生草本植物狗尾草、稗、苍耳、鬼针草和多年生草本植物狗牙根、香附子等是三峡库区消落带优势物种;单因素方差分析表明,香溪河消落带植物群落的丰富度、多样性、均匀度和优势度在各水位梯度带上差异显著(p<0.05),植物群落物种多样性沿水位高程梯度145~175m呈先增加后降低的抛物线状变化;水文机制是影响消落带植物群落组成的重要因素

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