Evapotranspiration and water source of a tropical rainforest in peninsular Malaysia
Evapotranspiration and water source of a tropical rainforest in peninsular Malaysia
复制标题
DOI：
10.1002/hyp.11360
复制
发表时间：
2017-10
影响因子：
3.2
通讯作者：
M. Lion;Y. Kosugi;S. Takanashi;S. Noguchi;Masayuki Itoh;M. Katsuyama;N. Matsuo;S. Shamsuddin
中科院分区：
文献类型：
--
作者：
M. Lion;Y. Kosugi;S. Takanashi;S. Noguchi;Masayuki Itoh;M. Katsuyama;N. Matsuo;S. Shamsuddin
为了评估热带雨林的用水和支持水源，在马来西亚半岛的一个低地龙脑香林Pasoh森林保护区进行了为期4年的蒸散量（ET）评估。利用涡度相关法和降雨、植物、土壤和溪流沃茨的同位素信号确定了不同水分条件下的森林水源。进行了四次采样活动，以收集土壤和植物枝条样品在潮湿，中度，干燥，非常干燥的条件下，同位素信号的识别。2012年至2015年的年蒸散量相当稳定，平均为1，182 ± 26 mm，即使在干旱时期也观察到大量的日蒸散量，尽管观察到一些下降，与土壤体积含水量相对应。在湿润期，ET所需的水来自0至0.5 m之间的表层土壤，而在干燥期，约50%至90%来自0.5 m以下的深层土壤，来自该森林几个月前的降水。同位素特征表明，植物、土壤和溪流的水源都是不同的。植物中的水通常与土壤中的水不同，这可能是因为植物中的水来自于与土壤颗粒紧密结合的水不同的来源。植物没有表现出偏好的土壤深度与它们的大小，而存在的木质部储存水的建议。除了一部分快速响应径流外，该森林的蒸散量是平衡的，并利用大部分可用水源维持。
To evaluate water use and the supporting water source of a tropical rainforest, a 4‐year assessment of evapotranspiration (ET) was conducted in Pasoh Forest Reserve, a lowland dipterocarp forest in Peninsular Malaysia. The eddy covariance method and isotope signals of rain, plant, soil, and stream waters were used to determine forest water sources under different moisture conditions. Four sampling events were conducted to collect soil and plant twig samples in wet, moderate, dry, and very dry conditions for the identification of isotopic signals. Annual ET from 2012 to 2015 was quite stable with an average of 1,182 ± 26 mm, and a substantial daily ET was observed even during drought periods, although some decline was observed, corresponding with volumetric soil water content. During the wet period, water for ET was supplied from the surface soil layer between 0 and 0.5 m, whereas in the dry period, approximately 50% to 90% was supplied from the deeper soil layer below 0.5‐m depth, originating from water precipitated several months previously at this forest. Isotope signatures demonstrated that the water sources of the plants, soil, and stream were all different. Water in plants was often different from soil water, probably because plant water came from a different source than water that was strongly bound to the soil particles. Plants showed no preference for soil depth with their size, whereas the existence of storage water in the xylem was suggested. The evapotranspiration at this forest is balanced and maintained using most of the available water sources except for a proportion of rapid response run‐off.