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Spatial and seasonal patterns of water use in Mediterranean coastal dune vegetation
Plant and Soil ( IF 4.9 ) Pub Date : 2022-05-12 , DOI: 10.1007/s11104-022-05443-z
María Zunzunegui, M. Paz Esquivias, Juan B. Gallego-Fernández

Aims

This paper examines the water dynamics of a coastal dune plant community, addressing spatial and seasonal variations. We aimed to detect the patterns of water use by plants at the community level according to their distribution across a coastal dune gradient from beach to inland.

Methods

Five sites were established: upper beach, embryo-dune, slack, foredune, and inland. Eight perennial species were collected seasonally to analyse the isotopic composition and water potential. Soil water samples at 3 depths, groundwater, and atmosphere, were obtained to determine plant water sources.

Results

The species from Inland and foredune plant communities, Retama, Juniperus, and Helichrysum, showed the most stable isotopic signal throughout the year. On the contrary, the species most abundant on the upper beach, embryo-dune, and slack (Ammophila, Achillea, and Polygonum) showed the highest variability. Water deficit decreased the dependence on shallow and mid-soil layers along the beach-inland gradient. Beach and embryo-dune sites showed less negative leaf water potential values than the other positions in the dune gradient.

Conclusions

Three factors mark the proportion of water sources used for vegetation in coastal vegetation: community composition, distance to the sea, and seasonality. Coastal dune vegetation exhibited a species-specific response in water uptake that was modified by its location on the gradient. From upper beach to inland, the plant communities showed a slight progressive increase in the use of water from deeper layers. This pattern was similar and overlapped with the wet to dry seasonal pattern.



中文翻译:

地中海沿岸沙丘植被用水的空间和季节格局

目标

本文研究了沿海沙丘植物群落的水动态,解决了空间和季节变化。我们的目的是根据植物在从海滩到内陆的沿海沙丘梯度上的分布来检测社区一级植物的用水模式。

方法

建立了五个地点:上海滩、胚胎沙丘、松弛、前丘和内陆。季节性收集八种多年生物种以分析同位素组成和水势。获取 3 个深度的土壤水样、地下水和大气,以确定植物水源。

结果

来自内陆和前缘植物群落的物种RetamaJuniperusHelichrysum全年表现出最稳定的同位素信号。相反,在上海滩、胚胎沙丘和松弛处最丰富的物种(AmmophilaAchilleaPolygonum)表现出最高的变异性。缺水减少了对沿海滩-内陆梯度的浅层和中层土层的依赖。与沙丘梯度中的其他位置相比,海滩和胚胎-沙丘位点显示出较少的负叶水势值。

结论

三个因素标志着沿海植被中用于植被的水源比例:群落组成、到海的距离和季节性。沿海沙丘植被在吸水方面表现出物种特异性反应,该反应因其在梯度上的位置而改变。从上海滩到内陆,植物群落显示出对深层水的使用略有增加。这种模式与湿季干季模式相似并重叠。

更新日期:2022-05-13
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