How do depth, duration and frequency of flooding influence the establishment of wetland plant communities?
How do depth, duration and frequency of flooding influence the establishment of wetland plant communities?
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DOI：
10.1023/a:1009875226637
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发表时间：
2000-04-01
期刊：
影响因子：
1.7
通讯作者：
Brock, MA
中科院分区：
文献类型：
--
作者：
Casanova, MT;Brock, MA
在许多临时湿地，如澳大利亚新南威尔士州北方高原，植物群落的发展主要是从一个长寿命的休眠种子库发芽和建立的结果，以及在干旱中生存的营养繁殖体。在这些湿地中，植物地带性的模式可以每年和季节不同，深度并不总是一个很好的指标，在不同的区域的植物群落组成。为了确定哪些方面的水制度（深度，持续时间或频率的洪水）是重要的，在植物群落的发展实验，使用种子库材料从两个湿地进行了16周的时间在1995-1996年春末夏初。种子库样品暴露于17个不同的水位处理与不同的深度，持续时间和频率的洪水。在实验结束时，对从种子库建立的群落的物种丰富度和生物量进行了评估，并对数据进行了检查，以确定水分状况的哪些方面在不同群落的发展中是重要的。结果发现，淹没的深度，持续时间和频率影响植物群落组成，但深度是最不重要的，也是个人的洪水事件的持续时间是重要的隔离植物群落。物种根据其耐受或应对洪水和干旱波动的能力进行分组。最高的生物量和物种丰富度的盆，从来没有被淹没。最少的生物量和物种丰富度的盆，不断淹没。短时间频繁的洪水促进了物种丰富度和生物量的增加，特别是具有异源性的两栖类波动耐受种和两栖类波动响应种。陆地物种能够建立在短期洪水之间的干旱阶段。深度是重要的，在确定是否两栖波动容忍或两栖波动响应物种有更大的生物量。洪水持续时间越长，陆地物种的物种丰富度和生物量就越低。这种实验可以帮助预测植被对自然湿地和改良湿地水位变化的响应。
In many temporary wetlands such as those on the Northern Tablelands of New South Wales Australia, the development of plant communities is largely the result of germination and establishment from a long-lived, dormant seed bank, and vegetative propagules that survive drought. In these wetlands the pattern of plant zonation can differ from year to year and season to season, and depth is not always a good indicator of the plant community composition in different zones. In order to determine which aspects of water regime (depth, duration or frequency of flooding) were important in the development of plant communities an experiment using seed bank material from two wetlands was undertaken over a 16 week period in late spring-early summer 1995-1996. Seed bank samples were exposed to 17 different water-level treatments with different depths, durations and frequencies of flooding. Species richness and biomass of the communities that established from the seed bank were assessed at the end of the experiment and the data were examined to determine which aspects of water regime were important in the development of the different communities. It was found that depth, duration and frequency of inundation influenced plant community composition, but depth was least important, and also that the duration of individual flooding events was important in segregating the plant communities. Species were grouped according to their ability to tolerate or respond to fluctuations in flooding and drying. The highest biomass and species richness developed in pots that were never flooded. Least biomass and species richness developed in pots that were continuously flooded. Short frequent floods promoted high species richness and biomass especially of Amphibious fluctuation-tolerator species and Amphibious fluctuation-responder species that have heterophylly. Terrestrial species were able to establish during dry phases between short floods. Depth was important in determining whether Amphibious fluctuation-tolerator or Amphibious fluctuation-responder species had greater biomass. Longer durations of flooding lowered species richness and the biomass of terrestrial species. Experiments of this kind can assist in predicting vegetation response to water-level variation in natural and modified wetlands.