典型温冰川区多相态水体稳定同位素示踪研究

Selecting Mt. Yulong in China's monsoonal temperate glacier region as the study area , the following work plans to do in this applied program, based on the methods of isotopic investigation, tracing and modeling: (1) to study the stable isotopic fractionation in different water bodies in this typical temperate-glacier basin and to reveal the temporal and spatial variation patterns of stable isotopes caused by various origins of vapor transportation, temperature and precipitation, in relation to the water circulation in the southern-monsoon climate system; (2) to describe the contributions of various water sources to local water resources, especially of the impact of changing glaciers in Mt. Yulong on water resource in Lijiang Basin; to assess different contributions to land-surface runoffs based on the establishment of a hydrograph separation with a mixing-model by isotopic tracing; (3) to investigate stable isotopic composition of plant water in different habitats, to explore the isotopic characteristics in soil-vegetation-atmosphere system and quantitatively estimate the water sources of some selected plants. The project can make contributions to further understanding of the relationship and interaction of atmosphere-hydrology-ecosystem by the way of isotopic tracing, to provide scientific basis for the protection of ecosystem and rational use of natural resources in the temperate-glacier area under the background of climate warming.

选择我国典型季风温冰川区玉龙雪山地区为研究区，通过调查观测、同位素示踪和模型模拟等手段，主要开展如下研究工作：（1）分析温冰川区多相态水体稳定同位素的分馏变化规律，揭示多相态水体中稳定同位素的时空变化特征及其与水汽源地、水汽输送及气温降水等影响因素的相互关系，并尝试分析南亚季风区水循环过程；（2）选择典型流域为研究对象，以稳定同位素为示踪剂建立径流分割模型，定量评估不同水源对区域地表地下水的贡献，分析玉龙雪山冰川变化对丽江盆地水资源的影响；（3）比对不同生活型植物和各个水源的氢氧同位素组成，研究典型温冰川研究区土壤－植被－大气系统不同载体中水分的稳定性同位素特征，分析典型植物的水分来源及其时空差异。研究有助于了解全球变化背景下温冰川区的大气-水文-生态系统的相互作用关系，为本区生态系统的修复和保护，区域水资源的合理利用提供科学依据。

本项目选用同位素方法，对我国典型季风温冰川区玉龙雪山地区开展了水文-生态过程的系统研究。研究揭示了研究区多相态水体稳定同位素的分馏变化规律，分析各类水体之间的补给和转换关系；以同位素为示踪剂建立径流分割模型，定量评估冰川融水对流域水资源的贡献率和影响；调查玉龙雪山东坡的植被分布特征，结合同位素方法，分析高山生态系统植物的水分来源，并进一步开展冰川末端的植被演替研究，了解全球变暖和冰川退缩背景下冰川与植被的相互关系，为当地水资源管理和生态环境的保护和修复提供科学依据。