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机械沙障在退化人工梭梭林恢复中的应用 预览 被引量:17

Application of Sand Barriers in Regenerating the Degenerated Artificial Forests of Haloxylon ammodendron Bge
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摘要 在民勤治沙综合试验站进行的退化人工梭梭林恢复试验表明,机械沙障可以提高退化梭梭林下垫面的粗糙度,降低近地面层风速,固定流沙,减少风蚀,同时对退化植被及其土壤含水率也有一定的恢复作用,可在绿洲边缘退化植被恢复中推广应用.三种机械措施相比,布设前两年的麦草方格沙障的防风固沙效果最好,但作用年限最短,年成本最高,价值系数低;粘土沙障的防风固沙效果最差,年成本最低,价值系数最高;塑料方格沙障防风固沙效果、年成本和价值系数均介于麦草方格沙障和粘土沙障之间. The study area is at Minqin Desert Control Experiment Station located in the Shajingzi region in the southern marginal zone of the Badain Juran Desert, where it belongs to the typical arid desert climate, the annual, maximum and minimum temperatures are 7.68℃, 40.0℃ and -28.8℃ respectively; the annual precipitation and evaporation are 116.2 mm and 2 643.9 mm respectively, the average relative humidity is 51%, the aridity index is 5.3, and the frost-free period is 175 days; the average annual wind speed and sand-rising wind speed are 2.5 m/s and 5.0 m/s respectively; and the days of occurring strong winds, dust storms, blowing dusts and floating dusts are 26.3, 25, 37.5 and 29.7 days respectively. In this paper, an experimental study on regenerating the degenerated artificial forests of Haloxylon arnrnodendron Bge with the mechanical sand barriers is carried out at Minqin Desert Control Experiment Station. The results show that the roughness of underlaying surface under the degenerated forests of Haloxylon arnrnodendron Bge is increased as soon as the mechanical sand barriers are built in the forests, the wind speed and sand flux intensity at height of 0~20 cm is decreased, the mobile dunes can be fixed, and the wind erosion can be reduced. Moreover, the mechanical sand barriers can play a certain role in regenerating the degenerated artificial forests of Haloxylon arnrnodendron Bge and increasing soil moisture content, and they can be extensively applied in regenerating the degenerated vegetations in the marginal zone of oases. After comparing, it is considered that the sand-fixing effect of wheat straw breaks is the best in the first 2 years, but their service time is short, their annual cost is high, and their value coefficient is low; the sand-fixing effect of clay sand barriers is the poorest, their annual cost is the lowest, and their value coefficient is the highest; the sand-fixing effect, annual cost and value coefficient of plastic breaks are moderate among the 3 kinds of sand barriers.
作者 马全林 王继和 刘虎俊 詹科杰 MA Quan-lin, WANG Ji-he, LIU Hu-jun, ZHAN Ke-jie (Gansu Provincial Institute of Desert Control Research, Wuwei 733000, Gansu Province, China)
出处 《干旱区研究》 CSCD 北大核心 2005年第4期 526-531,共6页 Arid Zone Research
基金 科技部专项基金
关键词 机械沙障 退化 人工梭梭林 恢复重建 防风固沙 价值分析 民勤 mechanical sand barrier degeneration artificial forests of Haloxylon ammodendron Bge vegetation regeneration sand-fixing effect value analysis.
作者简介 马全林(1974-),男,甘肃陇西人,助理研究员,硕士,主要从事荒漠植物生理生态学与荒漠化防治研究. Email:mql@gsdcri.com
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