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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Vegetation succession prevents dry lake beds from becoming dust sources in the semi-arid steppe region of China
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Vegetation succession prevents dry lake beds from becoming dust sources in the semi-arid steppe region of China

机译：植被继承可防止干燥的湖床成为中国半干旱地区的尘埃源

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East Asian dust storms have become increasingly intense over the last two decades, and the arid inland regions of northern China have been recognized as the main dust source areas. Numerous lakes in this region have recently become desiccated, leaving large areas of bare ground prone to becoming potential dust sources. Vegetation cover characteristics and vegetation succession following lake desiccation remain unclear. Here we chose eight inland dry lakes, one outflow lake and one river on the southeast edge of the Inner Mongolian Plateau to investigate vegetation patterns along transects from lake bed to lake shore, and determine the relationships between vegetation patterns and environmental factors. The results show that dry lake bed soils do indeed have high contents of fine particles. Also, soil salt content is the most critical control on vegetation succession on desiccated lake beds, and vegetation is unlikely to colonize areas with soil salt content ≥5%. Soil texture additionally influenced vegetation patterns by affecting soil salt content. The likely vegetation succession on dry like beds is Nitraria tangutorum community > Suaeda corniculata and Suaeda glauca communities > Achnatherum splendens and Elymus sibiricus communities, and finally Carex duriuscula community as the probable climax. When vegetation is at the later stages of succession, for example with Achnatherum splendens communities, Elymus sibiricus communities and Carex duriuscula communities, soil may be protected from wind erosion because of their high vegetation cover and high proportion of perennials. We suggest grazing should be avoided around lake shores, especially in Achnatherum splendens communities, because high vegetation cover and biomass not only protect soil from erosion, but also promote the deposition of fine particles blown from upwind regions.
机译：在过去的二十年中，东亚尘暴变得越来越激烈，中国北方的内陆地区被认为是主要的尘埃源领域。该地区的许多湖泊最近变得干燥，留下了大面积的裸露的地面，以成为潜在的粉尘来源。湖泊干燥后植被覆盖特征和植被连续仍然不清楚。在这里，我们选择了八个内陆干湖，一个流出湖泊和内蒙古高原的东南边缘的一条河流，以调查距离湖泊湖到湖岸的植被模式，并确定植被模式与环境因素之间的关系。结果表明，干湖床土确实具有高含量的细颗粒。此外，土壤盐含量是在干燥的湖泊床上植被连续的最关键控制，植被不太可能与土壤盐含量≥5％的地区殖民地。土壤纹理通过影响土壤盐含量而另外影响植被模式。干燥床的可能植被连续是尼塔利亚·唐园社区> Suaeda Corniculata和Suaeda Glauca社区> Achnatherum Splendens和Elymus Sibiricus社区，最后Carex Duriuscula社区作为可能的高潮。当植被处于继承后来的阶段，例如achnatherum仙境社区，Elymus sibiricus群落和Carex Duriuscula社区，由于其高植被覆盖和多年生的高比例，土壤可能免受风蚀。我们建议在湖岸周围避免放牧，特别是在Achnatherum Splendens社区，因为高植被覆盖和生物量不仅保护土壤免受侵蚀，而且还促进了从涡卷区域吹出的细颗粒的沉积。

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