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首页> 美国卫生研究院文献>other >Response of Plant Height Species Richness and Aboveground Biomass to Flooding Gradient along Vegetation Zones in Floodplain Wetlands Northeast China
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Response of Plant Height Species Richness and Aboveground Biomass to Flooding Gradient along Vegetation Zones in Floodplain Wetlands Northeast China

机译：东北洪泛区湿地植被带植物高度物种丰富度和地上生物量对洪泛梯度的响应

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Flooding regime changes resulting from natural and human activity have been projected to affect wetland plant community structures and functions. It is therefore important to conduct investigations across a range of flooding gradients to assess the impact of flooding depth on wetland vegetation. We conducted this study to identify the pattern of plant height, species richness and aboveground biomass variation along the flooding gradient in floodplain wetlands located in Northeast China. We found that the response of dominant species height to the flooding gradient depends on specific species, i.e., a quadratic response for Carex lasiocarpa, a negative correlation for Calamagrostis angustifolia, and no response for Carex appendiculata. Species richness showed an intermediate effect along the vegetation zone from marsh to wet meadow while aboveground biomass increased. When the communities were analysed separately, only the water table depth had significant impact on species richness for two Carex communities and no variable for C. angustifolia community, while height of dominant species influenced aboveground biomass. When the three above-mentioned communities were grouped together, variations in species richness were mainly determined by community type, water table depth and community mean height, while variations in aboveground biomass were driven by community type and the height of dominant species. These findings indicate that if habitat drying of these herbaceous wetlands in this region continues, then two Carex marshes would be replaced gradually by C. angustifolia wet meadow in the near future. This will lead to a reduction in biodiversity and an increase in productivity and carbon budget. Meanwhile, functional traits must be considered, and should be a focus of attention in future studies on the species diversity and ecosystem function in this region.
机译：据预测，自然和人类活动造成的洪灾变化将影响湿地植物群落的结构和功能。因此，重要的是对一系列的洪水梯度进行调查，以评估洪水深度对湿地植被的影响。我们进行了这项研究，以查明中国东北洪泛区湿地植物的高度，物种丰富度和地上生物量的变化趋势。我们发现优势物种高度对淹没梯度的响应取决于特定物种，即，对于Lascarpocar​​pa的二次响应，对Calamagrostis angustifolia的负相关，而对Appexappliculata没有响应。物种丰富度显示了从沼泽到湿草甸沿植被带的中间效应，而地上生物量却增加了。当对群落进行单独分析时，只有地下水位深度对两个Carex群落的物种丰富度有显着影响，而对C. angustifolia群落没有影响，而优势种的高度影响地上生物量。当将上述三个群落组合在一起时，物种丰富度的变化主要取决于群落类型，地下水位深度和群落平均高度，而地上生物量的变化则取决于群落类型和优势物种的高度。这些发现表明，如果该地区这些草本湿地的生境干燥继续进行，那么不久的将来，两个Carex沼泽将逐渐被C. angustifolia湿地取代。这将导致生物多样性的减少以及生产力和碳预算的增加。同时，必须考虑功能性状，并且应成为今后对该区域物种多样性和生态系统功能的研究重点。

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