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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.
The water stability of bio-crust layers with different compositions and biomass of loess hilly region was studied with the improved soil water stable aggregates quantitative method.The results show that the water stability of the bio-crust is related to its biological composition, and the moss crust Water stability was significantly higher than that of algal crust. After shaking for 390 times, the thickness and mass loss rate of moss crust were only 47.3% and 40.1% of the loss rate of algal crust, respectively. The water stability and bio-crust Biological composition of the biological crust coverage of more than 60% coverage of the highest stability, quality and thickness loss rates were algal crust (no moss coverage) loss rate of 28.6% and 22.7%; biological crust horizontal structure of water The stability was significantly higher than the vertical direction, the area loss rate of moss crust was only 6.4% of the thickness loss rate after shaking 390 times.Experimental analysis confirmed that the bio-crust was a horizontal structural stability of the layered structure, This structural feature enhances its resistance to wind and water erosion.