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水分为干旱区固沙造林的主要制约因子,特别是在荒漠地区无地下水和灌溉水补给的高大沙丘、栽植固沙植物后,由于蒸腾耗水,使沙丘水分发生变化,进而影响到固沙植物的生长发育。因此,探讨固沙林下沙丘水分的变化规律具有现实意义。我国西北地区,梭梭分布面积约110万公顷,是当地重要固沙造林树种。但是,七十年代以来,人工梭梭林普遍出现衰退、死亡现象,许多专家,学者认为与造林后沙丘水分状况恶化有关。为此,本文重点讨论梭梭造林后沙丘水分状况的变化。
Water is the main limiting factor for afforestation in arid areas. Especially in the tall sand dunes without groundwater and irrigated water supply in the desert areas, after the sand-fixing plants are planted, the water content in the dune changes due to transpiration and water consumption, which affects the growth and development of sand-fixing plants . Therefore, it is of practical significance to explore the variation law of sand dune under sand-fixation. In northwestern China, Haloxylon distributes an area of about 1.1 million hectares and is an important afforestation tree species. However, since the 1970s, artificial Haloxylon ammodendron forests generally experienced recessions and deaths, and many experts and scholars believe that they are related to the deteriorating water conditions of sand dunes after afforestation. Therefore, this paper focuses on the changes of sand dune water status after Haloxylon ammodendron forestation.