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Regeneration potential of Taxodium distichum swamps and climate change

机译:南方红豆杉沼泽的更新潜力与气候变化

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Seed bank densities respond to factors across local to landscape scales, and therefore, knowledge of these responses may be necessary in forecasting the effects of climate change on the regeneration of species. This study relates the seed bank densities of species of Taxodium distichum swamps to local water regime and regional climate factors at five latitudes across the Mississippi River Alluvial Valley from southern Illinois to Louisiana. In an outdoor nursery setting, the seed banks of twenty-five swamps were exposed to non-flooded (freely drained) or flooded treatments, and the number and species of seeds germinating were recorded from each swamp during one growing season. Based on ANOVA analysis, the majority of dominant species had a higher rate of germination in non-flooded versus flooded treatments. Similarly, an NMS comparison, which considered the local water regime and regional climate of the swamps, found that the species of seeds germinating, almost completely shifted under non-flooded versus flooded treatments. For example, in wetter northern swamps, seeds of Taxodium distichum germinated in non-flooded conditions, but did not germinate from the same seed banks in flooded conditions. In wetter southern swamps, seeds of Eleocharis cellulosa germinated in flooded conditions, but did not germinate in non-flooded conditions. The strong relationship of seed germination and density relationships with local water regime and regional climate variables suggests that the forecasting of climate change effects on swamps and other wetlands needs to consider a variety of interrelated variables to make adequate projections of the regeneration responses of species to climate change. Because regeneration is an important aspect of species maintenance and restoration, climate drying could influence the species distribution of these swamps in the future.
机译:种子库密度对局部到景观尺度的因素都有响应,因此,在预测气候变化对物种再生的影响时,可能需要了解这些响应。这项研究将分布在从伊利诺伊州南部到路易斯安那州的密西西比河冲积谷的五个纬度上的红豆杉沼泽种子的种子库密度与当地水情和区域气候因素相关联。在室外苗圃环境中,将25个沼泽的种子库暴露于非淹没(自由排水)或淹没处理,并记录每个沼泽在一个生长季节中发芽的种子的数量和种类。根据ANOVA分析,在非淹水处理和淹水处理中,大多数优势种的发芽率更高。类似地,NMS比较(考虑了当地的水情和沼泽的区域气候)发现,发芽的种子种类在未淹水处理与淹水处理下几乎完全转移。例如,在潮湿的北部沼泽中,紫杉的种子在非淹没条件下发芽,但在淹没条件下没有从同一种子库发芽。在南部潮湿的沼泽中,Eleocharis cellulosa的种子在水淹条件下发芽,但在非水淹条件下不发芽。种子萌发和密度关系与当地水情和区域气候变量之间的密切关系表明,预测气候变化对沼泽和其他湿地的影响需要考虑各种相互关联的变量,以充分预测物种对气候的再生响应更改。由于再生是物种维持和恢复的重要方面,因此气候干燥将来可能会影响这些沼泽的物种分布。

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