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首页> 外文期刊>Ecological research >Occurrence of seasonal water replacement in mangrove soil and the trunk growth response of Avicennia alba related to salinity changes in a tropical monsoon climate
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Occurrence of seasonal water replacement in mangrove soil and the trunk growth response of Avicennia alba related to salinity changes in a tropical monsoon climate

机译：热带季风气候下红树林土壤中季节性换水的发生和白僵菌树干生长与盐度变化的关系

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摘要

Salinity is a crucial factor regulating mangrove growth. We evaluated seasonal variations in soil water salinity and the water replacement process in a tropical monsoon mangrove forest of eastern Thailand during 2015-2018. Trunk growth of Avicennia alba was monitored monthly using dendrometer bands and was analyzed in relation to water replacement. Soil water salinity showed remarkable seasonal variation that was influenced by the infiltration of inundated water from the river, with a salinity level similar to that of seawater during the middle of the dry season and to that of fresh water during the middle of the rainy season. Patterns of soil water salinity shifted seasonally in both horizontal and vertical distributions, highlighting soil water replacement between the two seasons. In the middle of the rainy season, soil water salinity across the horizontal distribution was nearly fresh at most sampling points on the river side but gradually increased landward along a 120-m transect. The vertical distribution of soil water salinity showed relatively low salinity at the surface horizon, which gradually increased downward to a 100-cm depth. In the dry season, the soil salinity gradient in both distributions was opposite to that in the rainy season. This seasonal change in soil water salinity was significantly related to the trunk growth of A. alba, which increased greatly during the rainy season. Seasonal water replacement causes fluctuations in soil salinity and probably nutrient availability. The combination of low soil water salinity and large nutrient influx might enhance trunk growth during the rainy season.
机译：盐度是调节红树林生长的关键因素。我们评估了泰国东部热带季风红树林在2015-2018年期间土壤水盐分和水置换过程的季节性变化。每月使用树状测风计带监测白晨草的树干生​​长，并分析其与水替代的关系。土壤水盐度显示出显着的季节性变化，受河水淹没的影响，其盐度水平与旱季中期的海水相似，与雨季中期的淡水相似。土壤水盐度的模式在水平和垂直分布上均季节性变化，突出了两个季节之间的土壤水替代。在雨季的中段，水平分布的土壤水盐分在河边的大多数采样点几乎是新鲜的，但沿120米的样带逐渐向陆地增加。土壤水盐分的垂直分布在地表水平显示出较低的盐分，并逐渐向下增加至100厘米深。在干旱季节，两种分布的土壤盐分梯度与雨季相反。土壤水盐度的这种季节性变化与白曲霉的树干生长显着相关，在雨季时白桦的树干生长显着增加。季节性补水会引起土壤盐分的波动，并可能导致养分的供应。低水盐分和大量养分流入的结合可能会增加雨季的树干生长。

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