摘要:植物叶性状与光合生理特性对淹水的响应分析，有助于理解水淹生境中沼泽湿地植物叶片构建模型及其光合作用机理。按照小苏干湖湖水泛滥区静水持留时间长短变化设置：I （轻度淹水区，静水持留60-90 d）、Ⅱ （中度淹水区，静水持留90-150 d）、Ⅲ （重度淹水区，静水持留150-210 d）3个梯度，研究了小苏干湖湿地典型泌盐植物海乳草叶性状与光合生理特性对不同淹水生境的响应变化。结果表明：随着静水持留时间变长，土壤含水量逐渐增大，含盐量和光合有效辐射逐渐减小，湿地群落的盖度、密度呈增加趋势，地上生物量呈先减小后增加趋势；海乳草叶片的叶面积呈增加趋势，叶厚度、净光合速率和气孔导度呈减小趋势，叶干重和蒸腾速率变化不明显；不同生境条件下的海乳草净光合速率、蒸腾速率与叶面积、叶厚度之间均存在着显著差异（P<0.05）。随着静水持留时间的延长，海乳草选择增大叶面积，减小叶厚度的生长策略，适时调整叶片的净光合速率，实现植物叶片对吸收光能的有效利用，体现了植物在异质性生境中叶性状间的资源分配策略和光合产物积累模式。



Abstract:The response analysis of plant leaf traits and photosynthetic physiological characteristics to flooding is helpful to understand the leaf construction model and photosynthesis mechanism of marsh wetland plants in the flooded habitats. The sample area was divided into three levels based on the length of the still water retention time in the lake flooding area of Xiaosugan Lake wetland: I(mild flooded field, still water retention 60-90 d), Ⅱ (moderately flooded area, still water retention 90-150 d), Ⅲ (heavy flooded area, still water retention 150-210 d). The results showed that with the increasing still water retention time, the soil moisture was gradually increased, the soil salinity and photosynthetically active radiation were gradually reduced, the coverage and density of wetland communities were increased, the aboveground biomass exhibited increase first and decrease afterwards, the leaf area of Glaux maritima L increased and the leaf thickness, net photosynthetic rate, stomatal conductance decreased, the leaf dry weight and transpiration rate did not change significantly. There were significant differences in the relationship between net photosynthetic rate, photosynthetic rate and leaf area, leaf thickness of Glaux maritima L under different habitat conditions (P<0.05). With the extension of the still water retention time, the Glaux maritima L leaves selected the strategy to increase leaf area and reduce leaf thickness, improve the light energy utilization efficiency and reduce the net photosynthetic rate growth, which reflected the resource allocation strategy and photosynthetic product accumulation model of plant leaf traits in heterogeneous habitats.





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