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Water stability of biological soil crusts in hilly regions of Loess Plateau,Northwest China
Authors
杨凯
赵允格
马昕昕
Publication date
1 January 2012
Publisher
Abstract
采用改进的土壤水稳性团聚体数量测定方法,研究了黄土丘陵区不同组成和生物量的生物结皮层水稳定性.结果表明:生物结皮层的水稳定性与其生物组成有关,苔藓结皮的水稳定性显著高于藻结皮,震荡390次后,苔藓结皮的厚度和质量损失率仅分别是藻结皮损失率的47.3%和40.1%;生物结皮层水稳定性与生物结皮的生物组成有关,60%以上苔藓覆盖度的生物结皮的稳定性最高,质量和厚度损失率分别是藻结皮(无苔藓覆盖)损失率的28.6%和22.7%;生物结皮层水平方向结构水稳定性显著大于垂直方向,震荡390次后,苔藓结皮的面积损失率仅为厚度损失率的6.4%.试验分析证实,生物结皮层是一种水平方向稳定性极强的层状结构体,这一结构特性增强了其抗风蚀和水蚀的能力. </span
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018