【摘要】 本文根据1996年在中国科学院阿克苏水平衡试验站（E80°50’、N40°37’）棉田进行的试验观测资料，分析了灌溉前后农田土壤水分运动，阐述了绿洲棉田蒸散和土壤水热状况的特点和变化规律．更多还原

【Abstract】 Aksu Water Balance Experimental Station, where the research experlment was done )is located in the northern Tarim Basin, where is the largest cotton production region ofChina- Annual precipiahon is 44. 7nun and evaporation from water surface is 1500nunthere. This region is an irrigating area so the irrigating water is the only supply of soilmoisture. From Aug. 7 to Aug. 16, 1996, the parameters about sun radiation, air temperature and soil water-heat were measured in the stahon (E80°40’ , N40°37’). Accord-ing to the analysis of experiment data, some results are as following: (1) Betweent thecotton evapotranspiration (ET) and net radiation (An) there are the same changlng pro-cesses. The process of soil heat flux is alse siwhlar with the Rn. But the time of heattransthession from air to soil is less than Rn for 2~ 3 hours. Compared the oasis withdesert land, the processes and rate of ET are different. One of the reason is the moistureconditions are different- (2) Alter irrigahon, soil moirture are changed in whole ulisturat-ed zone. Groundwater table are rised 0. 3~5. 0m. The soil moisture not only moved con-tinuously vertical but also in horizontal in some location and some time. The changingspeed of soil moisture in cotton root zone is quicker than in other layer- The more soilmoisture content is,the more obvious this phenomenon is. Following the continuously ris-ing movement of soil mositure salt gathered in surface layer is serious- bo in this area it’sessential to wash surface salt before seeding. (3) There is a good relationship between cotton ET and the soil water storage changing (nW). But the rate of ET and main zone wa-ter storage changing have a good relation. bW in the layer of 1m from earth surface is lessthan ET. There are capillary ascension water from deep soil or grounnd water suppliedfrom 1m lower in soil layer.This paper includes four parts: (1) nature conditions of experimental area and experi-ment design. (2) the ET of cotton field and its changing characteristics. (3) soil water-heat condition and its changing in cotton field. (4)the relation analysising between ET ofcotton and soil water storage.更多还原