Gao Li-Qian, Zhao Yun-Ge, Qin Ning-Qiang, Zhang Guo-Xiu
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2013 Jan;24(1):105-12.
Based on the analysis of the effects of biological soil crust (biocrust) in re-vegetated grasslands on soil physical and chemical properties, and by using EPIC estimation model in combining with simulated rainfall trials, this paper studied the effects of biocrust with different biomass and different soil texture on the soil erodibility (K value) in Hilly Loess Plateau Region of Northwest China in different seasons. The results showed biocrust could significantly decrease soil erodibility, with the K value of biocrust soil decreased by about 17%, compared with subsoil. The soil erodibility decreased with the increasing biomass of biocrust. The K value of moss crust soil decreased by 21%, compared with cyanobacteria crust soil. The erodibiliy of biocrust soil differed with different seasons, being significantly higher in rainy season than before or after the rainy season due to the differences in the biological activity of the biocrust organisms. The erodibilty of biocrust soil with different texture also varied significantly, with the K value in the order of sandy loam soil > silt soil > sandy soil. The measurement under simulated rainfall showed that the development of biocrust could decrease the erodibility of biocrust soil by about 90%, compared with that of the subsoil (5-10 cm).
通过分析生物结皮对植被恢复草地土壤理化性质的影响，并结合模拟降雨试验运用EPIC估算模型，研究了中国西北黄土高原丘陵区不同生物量和不同土壤质地的生物结皮在不同季节对土壤可蚀性（K值）的影响。结果表明，生物结皮能显著降低土壤可蚀性，与下层土壤相比，生物结皮土壤的K值降低了约17%。土壤可蚀性随生物结皮生物量的增加而降低。苔藓结皮土壤的K值比蓝藻结皮土壤降低了21%。生物结皮土壤的可蚀性因季节而异，由于生物结皮生物的生物活性不同，雨季的可蚀性显著高于雨季前或雨季后。不同质地生物结皮土壤的可蚀性也有显著差异，K值大小顺序为砂壤土>粉砂土 >砂土。模拟降雨条件下的测定结果表明，与下层土壤（5-10厘米）相比，生物结皮的发育可使生物结皮土壤的可蚀性降低约90%。
