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本试验分别对腾格里沙漠东南缘沙坡头地区流动沙丘和1964年建植的人工固沙植被区生物土壤结皮的地表反照率和土壤湿度进行了同步测定。分析了该区这两种地表类型的反照率与太阳高度角和土壤湿度的相关性,分别提出了地表反照率与太阳高度角和土壤表层(0~2 cm)湿度的经验拟合关系式。结果表明,地表反照率随太阳高度角增加呈指数递减;排除太阳高度角的影响后,地表反照率随土壤湿度的增加也呈指数递减关系;流沙地表反照率对土壤湿度变化的响应要比生物土壤结皮地表敏感。
In this experiment, the surface albedo and the soil moisture of the biological soil crusts in the mobile sand dunes in Shapotou area at the southeast edge of the Tengger Desert and the artificial sand-fixing vegetation zone built in 1964 were measured synchronously. The correlation between the albedo of these two surface types and the solar elevation angle and soil moisture was analyzed. The empirical fitting relationship between the surface albedo and the solar elevation angle and the soil surface moisture (0 ~ 2 cm) was proposed respectively. The results showed that the surface albedo decreased exponentially with the increase of solar elevation angle. After altering the solar elevation angle, the surface albedo also showed an exponential decreasing relationship with the increase of soil moisture. The albedo of quicksand responded to changes of soil moisture more than that of biological Soil crust is sensitive to the earth’s surface.