王朗自然保护区不同地带土壤的水分特征曲线研究

Water Characteristic Curves of Soils in Different Zones in Wanglang Nature Reserve

土壤水分特征曲线是研究土壤水分运动的重要参数,但是长期以来,测定土壤对气态水分的运移规律是非常困难的。本研究通过使用吸湿等温曲线自动测绘仪-Aqua Sorp进行测定,并分析四川王朗国家级自然保护区不同地带土壤的水分特征曲线。结果表明,在相同水势的情况下,相同立地条件下不同土层的土壤水分特征曲线差异明显,不同立地条件相同土层的土壤水分特征曲线差异亦明显;整体上讲,森林地带土壤的持水能力最好,滑坡地带土壤的保水性最差。

Soil water characteristic curve is one of the most important parameters for studying soil water movement. However,it has been regarded as a difficult work to measure the movement law of vapor water in dry soil for a long time.This paper established and analyzed the soil water characteristic curves for soils in different zones in the Wanglang Nature Reserve of Sichuan,using Moisture Sorption Isotherm Generator-AquaSorp.The results showed that the soil water characteristic curves of different layers in the same sample site were different with each other and the soil water characteristic curves of same layers in the different layers were also different under the same water potential.In general,the moisture holding capacity of soil in the forestry is the best whereas that of soil in the landslide is the worst.