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Effects of soil-plant system change on ecohydrology during revegetation for mobile dune stabilization, chinese arid desert

引用

research in cold and arid regions 2009年第3期1卷 230-237页

作者： honglang xiao, juan ren, xinrong li key laboratory of ecohydrology and river basin science, shapotou desert research and experiment station, cold and arid regions environmental and engineering research institute, chinese academy of sciences, lanzhou, gansu 730000, china. chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst Key Lab Ecohydrol & River Basin Sci Shapotou Desert Res & Expt Stn Lanzhou 730000 Gansu Peoples R China

Soil-plant systems play an important role in sand fixing and surface protection in the arid desert of china. This study examines the ecohydrological responses after a soil-plant system change for mobile dune stabilization by using a series of soil hydrological experiments and ecological investigation. The study results showed that decades of succession of soil-plant system has endangered the stability of the protection system. With the accumulated water and nutrient, a bio-logical system develops in a thinner and thinner surface soil. Redistribution of precipitation has changed completely in the ecosystem. In 3–15 mm of soil, a high capacity of crust water retention ultimately limits most rainfall from infiltrating below 10–20 cm deep. When that takes place, lower plants begin to compete for water with grasses and shrubs. A drought horizon forms in 20–500 cm depth with shrub transpiration. Artificial shrubs with deep roots obtain hardly rainfall supply and are gradually eliminated from the protection system. All changes in water environment affect the structure and func-tion and stabilization of whole protection systems. It is necessary to establish a relatively stable water environment by managing the soil-plant system for constructing a sustainable protective system in arid desert.

关键词： drought layer ecohydrology soil-plant system water cycle

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