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《Journal of Desert Research》 2012-04
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Source of Soil Condensation Water in the Gurbantunggut Desert

CHEN Rong-yi(Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China)  
Water is a key factor for desert ecological environment.Soil condensation water is an important source of moisture for plants and lower organisms.By making use of homemade micro-lysimeter we measured soil condensation water from different soil crusts(cyanobacterial crust,lichen crust and moss crust,and bare sand as check) within surface undisturbed soil columns underlaid with nylon yarn net bed or waterproof plastic film.Soil condensation water is mainly formed in the upper 2 cm soil layer,and originates from two separate sources: the soil and the air,but the latter was more important.The proportion of soil condensation water within surface 2 cm soil layer from the soil source is 35.5% in spring,15.5% in summer,and 11.3% in autumn because the soil water content decreases from spring to autumn.The total condensation water in 55 days in autumn is 3.46 mm from bare sand,4.07 mm from cyanobacterial crust,4.89 mm from lichen crust,and 5.15 mm from moss crust.The results suggest that,besides precipitation,the condensation water is an essential source for replenishing surface soil water in arid and semi-arid areas.
【Fund】: 国家自然科学基金项目(40801019);; 新疆自然科学青年基金项目(2009211B41)资助
【CateGory Index】: S152.7
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