极干旱流沙区潜水蒸发量的测定与分析.doc

stxb201209281361- Determination and analysis of phreatic water evaporation in extra-arid dune region LI Hongshou, a, b, * WANG Wanfua, b a. The Conservation Institute of Dunhuang Academy, Dunhuang 736200, Gansu, China b. Key Scientific Research Base of Conservation for Ancient Mural (Dunhuang Academy) State Administration for Cultural Heritage, Dunhuang 736200, Gansu, China ) Abstracts: Extra-arid desert is a terminal of biological geochemistry circulation system. It has important value in scientific research and huge new discoveries, which is very useful in many regions, such as energy resources, mineral, water resources, ecology, biodiversity, tourism and characteristic agriculture. Meanwhile, extra-arid area’s desertification is a serious threat to the ecological safety of earth. Aeolian desertification is one of style of desertification caused by water shortage. Once desert has formed, it is very difficult to management or recovery. One of most effective methods for desert control is using integrated ecosystem management based on considering water and the soil. Therefore, it is very important to find a new available water resource, and authors’ research is in this field. In this paper, we select a Gobi on Dunhuang Mogao Grottoes of Kumtag desert fringe, where the buried depth of phreatic water is over 200 m. Using an arched shed-air conditioning system, where covered drift sand thickness of 2.0 m, the phreatic evaporation was measured for the first time. In order to analyze influence factors, the evaporation of phreatic water on Gobi was measured and compared. The temperature of soil and air, the humidity inside and outside of the arched shed were also monitored. It is found that the phreatic water under sand can go through sand layer and get to surface, which forms evaporation. The amount of evaporation changes along with solar radiation and temperature fluctuations in the day. It also changes periodically in the year. During five months from June to October