中文摘要：

[目的]研究干热河谷沟壑区表层土壤水分的变化特征。[方法]通过使用农业环境监测仪,测定沟壑区不同土壤类型（燥红土和变性土）、不同季节（旱季和雨季）、不同草本盖度、模拟浇灌条件下的表层土壤含水量。[结果]不同环境条件下,干热河谷沟壑区表层土壤含水量的变化规律具有差异性。燥红土表层土壤含水量小于变性土,二者含水量的变化幅度均较小,变性土含水量按幂函数微弱的衰减,而燥红土大体上呈波动性稳定;雨季土壤含水量大于旱季;高盖度草地区的表层土壤含水量高于低盖度草地区,随光照强度呈现同步变化;模拟灌溉条件下燥红土与变性土的土壤水分呈幂函数下降,尤其是在初期燥红土的衰减速度更快。[结论]研究结果不仅揭示了干热河谷沟壑区土壤水分动态变化规律,也能为区域生态恢复提供科学指导。

英文摘要：

[ Objective ] This research was conducted to study the variation characteristic of soil moisture in dry-hot valley. [ Method ] The agro-environment monitoring instrument was used to measure the surface soil moisture under different soil types（ dry red soil and vertisol）, differ-ent seasons （ dry and wet seasons ） ,different herb coverage and condition of simulate pour. [ Result] Differences existed in the change lawsof surface soil moisture in the gully region of dry-hot valley under different environment conditions. The surface soil moisture of dry red soilwas lower than vertisol＇ s, and the variations range of them were small, the soil moisture of vertisol was decaying weakly by power function,but the fluctuation of dry red soil was largely stable ; the soil moisture content of rainy season was less than dry season ; the surface soil mois-ture dominated by high coverage grassland was larger than those dominated by low coverage grassland, and both of them were keeping pacewith the light intensity; the soil moisture of dry red soil and vertisol declined by power function, and the soil moisture of dry red soil was de-caying faster, especially in the early. [ Conclusion] The results not only reveals the dynamic variation law of soil moisture in dry-hot valley,but also could provide scientific guidance for ecological recovery.