摘要
利用模拟降雨装置,研究了演替恢复初期不同植被覆盖以及不同处理下坡面降雨的产流过程和入渗率。实验研究结果表明,植被演替开始之初,由于地表土壤的土质比较疏松,土壤的入渗率比较大。随着植被演替的进行,土壤中有机质等物质的逐渐累积,土壤的理化性质发生了变化,土壤的入渗特征也随之降低。剪草降雨小区的实验研究结果说明,在降雨的初期,土壤的入渗性能相对较低,随着实验的进行,在雨滴的打击下,部分结皮被破坏,土壤的入渗率也随之增大。说明地表生物结皮的存在,降低了土壤的入渗性能。采取适当的措施破坏地表生物结皮,有利于提高土壤的入渗性能,增加干旱半干旱地区对降雨的利用程度。
In this study, simulating rainfall was applied to study the runoff process and infiltration rate of soil under the cover of vegetation at the preliminary succession stages. Results indicated that at the preliminary succession stages, as the soil texture was loose, soil infiltration was large. With the development of vegetation succession and the accumulation of organic matter in the soil, both physical and chemical properties of the soil were improved, which made the soil texture tight, and soil infiltration rate decrease. Simulating rainfall on clipped vegetation plots indicated that at the start of the rainfall, soil infiltration rate was low. With the progress of the rainfall, parts of the microbiotic soil crust were destroyed by the splash of the raindrop, and soil infiltration rate was improved. This result indicated that the existence of microbiotic soil crust reduced the soil infiltration rate. Thus it is of great importance to improve soil infiltration by destroying the microbiotic soil crust with proper measures (grazing or fire) in arid and semi-arid areas.
出处
《水土保持学报》
CSCD
北大核心
2004年第1期54-57,62,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目"坡面侵蚀输沙动力实验研究"(40371075)
关键词
植被恢复
植被演替
模拟降雨
产流特征
vegetation succession stage
simulating rainfall
microbiotic soil crust
infiltration rate
