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土壤凝结水是半干旱地区生态系统重要的水源,为阐明毛乌素沙地臭柏(Sabina vulgaris)冠层下土壤表层5cm凝结水的水汽来源,应用自制凝结试筒于2008年9—10月在毛乌素沙地开发整治研究中心院内开展试验。结果表明,毛乌素沙地土壤表层凝结水由吸湿水、大气水汽凝结水和土壤水汽凝结水组成;大气中的水汽总是先于土壤中的水汽到达和离开表层5cm土壤;大气中水汽对土壤表层5cm凝结水的贡献率小于土壤水汽的贡献率,9月上旬至中旬大气中水汽和土壤水汽的贡献比为2:5,9月下旬至10月中旬为3:10;单日凝结量和蒸发量呈现显著的线性关系。
In order to clarify the source of water vapor of 5 cm of condensate in the soil surface of Sabina vulgaris in the Mu Us desert, Sand Development and Rehabilitation Research Center hospital to carry out experiments. The results showed that the surface condensate in the Mu Us sandy soil consisted of hygroscopic water, condensed water vapor and condensed water from the soil. The water vapor in the atmosphere always reached and left the surface 5 cm before the water vapor in the soil. The contribution rate of 5cm condensate water is less than the contribution rate of soil water vapor. The contribution ratio of water vapor to soil water vapor in the atmosphere from early September to mid-September is 2: 5, from late September to mid-October: 3:10. The amount showed a significant linear relationship.