论文部分内容阅读
水分条件是决定干旱沙漠区生态环境的关键因素,凝结水是干旱区植物和低等生物的重要水分来源。利用自制蒸渗计在春、夏、秋3个季节对古尔班通古特沙漠苔藓、地衣、藻类及流沙4种地表类型表层原状土壤凝结水形成进行了观测研究。结果表明,在2cm、5cm、10cm、20cm 4种高度原状土中,用纱网封底土壤表层2cm和5cm土壤的凝结水测定结果能够真实的代表古尔班通古特沙漠不同类型地表土壤凝结水形成特征;凝结水主要集中产生在土壤表层2cm范围内;凝结水的水汽来源于空气和土壤且以空气来源为主,春季由于表层土壤含水率较高,来自于土壤的水汽所占的比重较高,地衣0～2cm表层凝结水来源于土壤水汽补充的比例春季为35.5%,夏季和秋季分别降到15.5%和11.3%;秋季55d的观测结果表明,凝结水形成总量随流沙、藻类、地衣和苔藓依次增加,分别为3.46mm、4.07mm、4.89mm和5.15mm,说明在干旱的沙漠地带,凝结水是除降水以外补充表层土壤水分最重要的水分来源。
Moisture conditions are the key factors that determine the ecological environment in arid desert areas. Condensate is an important water source for plants and lower organisms in arid regions. The formation of surface undisturbed soil condensation water in four types of moss, lichens, algae and quicksand in the Gurbantunggut desert in spring, summer and autumn was investigated by using homemade steaming meter. The results showed that the results of the determination of the condensate at 2 cm, 5 cm, 10 cm and 20 cm in the 2 cm and 5 cm soil coverings on the top of the gauze net can truly represent the different types of surface soil condensate in the Gurbantunggut Desert The formation of features; condensed water is mainly generated in the soil surface within 2cm range; water vapor from the condensate and air from the soil and the main source of spring due to the higher surface water content of soil moisture, water vapor from the soil than the proportion of In the autumn and autumn, the observation results of autumn 55 days showed that the total amount of the condensate formed was higher than that of the quicksand, algae, Lichens and moss increased in sequence, 3.46 mm, 4.07 mm, 4.89 mm and 5.15 mm, respectively, indicating that in arid deserts, condensate is the most important source of moisture for replenishing surface soil moisture other than precipitation.