亚热带内陆云雾林系统中雾水的水文生态效应

雾水对于一些陆地水文生态系统有着不可忽略的重要意义，然而目前国内外对于亚热带内陆云雾林系统中雾水水文生态效应的认识远不如沿海或热带地区。在我国南方地区雾日数增加和雾水酸化趋势的背景下，加强对雾水参与森林水文生态过程机制的研究更是具有重要意义。本项目基于前期在地处我国西南内陆的赤水山地云雾林所开展的研究工作和认识，进一步探究雾水在该地区的水文生态效应。通过开展野外长期气象观测和雨雾采样，揭示内陆水汽来源条件下的雨雾特征及其同位素组成的时空变化规律。探明林区典型植被的用水策略和对雾水的利用规律，阐述雾水对该地区生态系统的影响机制。将不同时空尺度下的同位素水文学方法与传统水文学方法相结合，在弄清水文转化过程的基础上确定雾水参与水文循环的机制及其贡献量。研究成果将有助于拓展人们在亚热带内陆地区雾水的水文生态意义方面的认识。

The significance of fog water in some terrestrial ecohydrological systems cannot be neglected. However, the ecohydrological functions of fogs in the subtropical inland cloud forest systems are far less understood than in coastal or tropical areas according to the literature around the world. Under the circumstance of increasing fog days and fog acidification in southern China regions, it is of great significance to further conduct the study on the behaviors of fog water in the forest ecohydrological processes. Based on our previous research work and findings in the Chishui montane cloud forest located in southwestern inland area, this project is to further explore the hydrological and ecological effects of fogs in this region. By carrying out long-term field meteorological observation and rain/fog water sampling, the characteristics of rain and fog events as well as their spatio-temporal variations of stable isotopic composition will be revealed. The water use strategy of typical plants and their utilization pattern of fog water will be explored to explain the influences of fogs on local ecosystems. By combining the isotope hydrology methods under different temporal and spatial scales with traditional hydrology methods, the participation mechanism of fog water and its contribution to the hydrological cycle will be determined on the basis of a good knowledge of hydrological processes. The research outcome will generate further insights into the hydrological and ecological significance of fogs in subtropical inland areas.