Tropical tree water use under seasonal waterlogging and drought in central Cambodia

IF 5.9 1区 地球科学 Q1 ENGINEERING, CIVIL
Yoshiyuki Miyazawa , Makiko Tateishi , Hikaru Komatsu , Vuthy Ma , Tsuyoshi Kajisa , Heng Sokh , Nobuya Mizoue , Tomo’omi Kumagai
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引用次数: 28

Abstract

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.

柬埔寨中部季节性涝渍和干旱下的热带树木用水
在柬埔寨中部,种植了快速生长的非本地树种,用于未来的木材生产。然而,人们对引进非地方性物种对森林蒸腾特性的影响了解较少,因为森林是由适应高度季节性环境的本地物种组成的。测量了柬埔寨中部两种本地树种和一种非特有树种的树液通量,以揭示其在季风亚洲地区的季节性趋势和变异。测量是在一个有10到15年历史的森林中进行的,在旱季和雨季,由不同的降雨模式定义。深度与地下水位的季节变化趋势与降雨量的季节变化趋势不同;地下水位在雨季后期为零,旱季开始后逐渐升高。本地种(Shorea roxburghii)树液通量与平衡蒸发条件的比值在旱季结束时急剧下降,非本地种(eucalyptus camaldulensis)树液通量在雨季中期下降,而tbenus (Dipterocarpus obtusifolius)树液通量与平衡蒸发条件的比值则没有明显的趋势。树液通量与平衡蒸发量的比值与地下水位深度呈负相关,而与桉树呈正相关,这可能是由于洪水的负面影响。除了大的季节变化外,树液通量的种内变化也很大,这是该幼林立地在旱季和雨季树面吸水的主要控制因素。综上所述,该森林的蒸腾特征具有物种特异性,并且更多地受地下水深度波动的控制,而不是由降雨事件定义的雨季/旱季的开始。
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来源期刊
Journal of Hydrology
Journal of Hydrology 地学-地球科学综合
CiteScore
11.00
自引率
12.50%
发文量
1309
审稿时长
7.5 months
期刊介绍: The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.
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