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水淹对三峡库区消落带南川柳植物群落的影响

DOI: 10.3969/j.issn.1000-2006.2013.04.005, PP. 23-28

Keywords: 消落带,水文生态过程,生物多样性,南川柳,三峡库区

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Abstract:

根据三峡库区冬蓄夏汛的水文生态过程,研究了消落带典型的冬季蓄水淹没和夏季汛期水淹对不同高程消落带土著植物南川柳(salixrosthorniiseemen)的盖度、基径和株高等生物学特征及群落物种多样性格局的影响。结果表明:冬季水淹后172m高程南川柳平均盖度与株高及175m高程平均株高显著增大(p<0.05),而对两高程段南川柳基径影响不明显(p>0.05)。夏季水淹后,172m高程南川柳平均盖度显著降低(p<0.05),基径和株高变化较小(p>0.05);而175m高程南川柳生物学特征受水淹影响不明显(p>0.05)。经过冬季和夏季水淹,172m高程物种patrick丰富度指数和shannon-wiener多样性指数先增大后降低,而175m高程则出现相反变化趋势;172m高程simpson优势度指数显著增大(p<0.05),而175m高程仅冬季水淹后显著增大(p<0.05)。就水淹后生物特征短时效而言,南川柳可以有效地作为三峡消落带植被恢复的适生物种,但为降低夏季水淹后由泥沙堆压造成的物理胁迫,需要适当的人为管护。

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