Tropical tree water use under seasonal waterlogging and drought in central Cambodia
Tropical tree water use under seasonal waterlogging and drought in central Cambodia
复制标题
DOI：
10.1016/j.jhydrol.2014.04.049
复制
发表时间：
2014-07
影响因子：
6.4
通讯作者：
Y. Miyazawa;M. Tateishi;H. Komatsu;V. Ma;T. Kajisa;H. Sokh;N. Mizoue;T. Kumagai
中科院分区：
文献类型：
--
作者：
Y. Miyazawa;M. Tateishi;H. Komatsu;V. Ma;T. Kajisa;H. Sokh;N. Mizoue;T. Kumagai
在柬埔寨中部，种植了生长迅速的非特有物种，用于未来的木材生产。然而，较少被理解的影响，引进非特有物种的蒸腾特性的森林，这是由本地物种，适应高度季节性的环境。在柬埔寨中部的两个本地和一个非特有树种的树干液流进行了测量，以揭示其在季风亚洲地区的季节性趋势和变化。测量进行了10至15岁的森林在旱季和雨季，由不同的降雨模式定义。地下水埋深的季节趋势与降雨量的季节趋势不同;地下水埋深在雨季后期达到零，在旱季开始后逐渐增加。树干液流的比例，本地物种，波普（刺梨），平衡蒸发条件下，在旱季结束时，表现出急剧下降，而一个非特有的物种，桉树（赤桉），在雨季中期下降，而Tbeng（Dipterocarpus obtusifolius）没有表现出明显的趋势。树干液流的平衡蒸发的比例呈负相关，在波佩尔的地下水位的深度，但在桉树呈正相关，可能是因为洪水的负面影响。除了大的季节变化，种内变化的汁液通量也很大，是一个主要的控制因素，在这个年轻的森林网站在旱季和雨季的树级水分吸收。总之，这片森林的蒸腾特性是种特异性的，控制地下水的波动深度，而不是由降雨事件定义的雨季/旱季的开始。
In central Cambodia, rapid growing non-endemic species are planted for future timber production. However, less is understood about the impact of the introduction of non-endemic species on the transpiration characteristics of the forest, which has been composed of native species that adapted to the highly seasonal environments. Sap flux of two native and one non-endemic tree species in central Cambodia was measured to reveal its seasonal trends and variability in the Monsoon Asia region. Measurements were carried out in a 10- to 15-year-old forest in the dry and rainy seasons that were defined by differing rainfall patterns. The seasonal trend in depth to water table differed from that of rainfall; groundwater table depth reached zero late in the rainy season and increased gradually after the onset of the dry season. The ratio of sap flux to an equilibrium evaporation condition of the native species, Popel (Shorea roxburghii), showed a sharp decline at the end of the dry season, whereas that of a non-endemic species, eucalyptus (Eucalyptus camaldulensis), decreased in the mid rainy season while Tbeng (Dipterocarpus obtusifolius) did not show a clear trend. The ratio of sap flux to an equilibrium evaporation was negatively correlated with the depth to water table in Popel, but was positively correlated in eucalyptus, possibly because of the negative effects of flooding. In addition to the large seasonal variation, intra-species variation in sap flux was also large and was a major controlling factor for tree-level water uptake at this young forest site in both dry and rainy seasons. In conclusion, the transpiration characteristics of this forest were species-specific and were controlled more by the fluctuating depths to groundwater rather than the onset of the rainy/dry seasons defined by rainfall events.