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草业学报  2010 

长期水分胁迫对典型湿地植物群落多样性特征的影响

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Keywords: 水位梯度,湿地植被,物种丰富度,Pielou均匀度,Shannon-Wiener多样性指数,三江平原

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Abstract:

不同水位梯度下的典型植被多样性特征研究,对湿地保护与恢复工作的开展具有重要借鉴意义。本研究基于为期3年的水分模拟试验,分析了不同水位梯度下,三江平原典型湿草甸、沼泽化草甸及沼泽群落多样性特征动态变化及响应差别。研究发现,沼泽化草甸群落与沼泽群落的3个多样性指数对不同水位梯度的响应较湿草甸群落明显;3个典型群落的Shannon-Wiener指数和物种丰富度总体均表现为随水位梯度的升高而下降的趋势,且每个群落均以物种丰富度的响应最为明显;而群落均匀度指数随水位梯度的升高以及淹水时间的延长,呈升高趋势;植物群落组成及格局在胁迫早期受水分条件影响最大,但最终格局是各环境及生物因子共同作用的结果。

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