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Effect of topography and protecting barriers on revegetation of sandy land, Southern Tibetan Plateau

机译:地形和保护屏障对青藏高原南部沙地植被恢复的影响

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Revegetation on sandy land has attracted worldwide attention, especially on the extremely fragile alpine eco-region of the Tibetan Plateau. However, the effectiveness of revegetation and its controlling factors have rarely been reported. We collected plant growths and species composition from seven field sites in 2011 and conducted a follow-up random investigation in 2016. The indicators, including richness and diversity, were used to compare the differences among these sites based on redundancy and cluster analyses. The results indicated that plant growth has different characteristics in different land types. The distribution and growth of Artemisia sphaerocephala, Artemisia younghusbandii and Heteropappus gouldii varied with topography, and the crown widths of A. sphaerocephala were 100.6?cm?×?87.2?cm on barchan dune and 26.0?cm?×?25.4?cm on moving sandy land at valley slopes. These species are likely the pioneer plants for revegetation on sandy land. It seems that sand-protecting barriers play an important role in revegetation. The stone and plastic checkerboard barriers increase plant diversity, while straw barrier promotes the plant growth. These findings provide useful guidance to the ongoing vegetation recovery on sandy land, an important component of the Project on Construction and Protection of Ecological Security Barriers on the Tibetan Plateau.
机译:沙地上的植被再造引起了全世界的关注,特别是在青藏高原极其脆弱的高山生态区。但是,很少有关于植被恢复的效果及其控制因素的报道。我们于2011年收集了七个野外站点的植物生长和物种组成,并于2016年进行了后续随机调查。基于冗余度和聚类分析,使用了丰富度和多样性等指标来比较这些站点之间的差异。结果表明,不同土地类型的植物生长具有不同的特征。球形沙蒿,小青蒿和古氏异形藻的分布和生长随地形而变化,在沙丘沙丘上,冠状动脉冠的宽度为100.6?cm?×?87.2?cm,移动时为26.0?cm?×?25.4?cm。谷地的沙质土地。这些物种可能是在沙地上进行植被再造的先锋植物。防沙屏障似乎在植被恢复中起着重要作用。石头和塑料棋盘格屏障增加了植物的多样性,而稻草屏障则促进了植物的生长。这些发现为正在进行的沙地植被恢复提供了有用的指导,沙丘是青藏高原建设和保护生态安全屏障项目的重要组成部分。

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