水土保持学报2024，Vol.38Issue(4)：38-44,54,8.DOI:10.13870/j.cnki.stbcxb.2024.04.021
黄土高原水蚀风蚀交错区不同生物结皮类型对土壤有机碳及其转化的影响
Effects of Different Biocrust Types on Soil Organic Carbon and Its Transformation in the Water-wind Erosion Crisscross Region of the Loess Plateau
摘要
Abstract
[Objective]Wind-water erosion crisscross region in Loess Plateau is a typical fragile ecosystem.Biological soil crusts(BSCs)are widely distributed in this region and play key roles in the accumulation and transformation of soil organic carbon(SOC).However,the effect of BSCs succession and microorganisms on enzymes related to organic carbon conversion is still unclear.[Methods]In this manuscript,SOC contents,microbial number and enzymes related with carbon conversion in different BSCs types were investigated.The relationships among SOC,microbial number and enzume activities related with carbon conversion were also analyzed by SEM model.[Results](1)BSCs succession significantly inceased SOC content and enzyme activities related with carbon conversion.SOC and enzyme activities in BSCs layer(0-2 cm)were significantly higher than those in bare sand 2-5 cm soil layer(p＜0.05).(2)The number of bacteria,fungi and actinomyces in moss crusts was the highest,and the number of fungi and actinomyces significantly increases with BSCs succession.Bacteria and fungi in the BSCs were significantly higher than those in 2-5 cm soil layer.However,actinomycetes in BSCs(except moss crusts)were lower than 2-5 cm layer.(3)SEM model indicated that SOC,enzyme activities and microbial number showed significant correlation.[Conclusion]The accumulation of SOC by BSCs succession provided a rich substrate and nutrients for enzymes related with carbon conversion and microbes,which were helpful for the increase of microbes and improvement of enzyme activities related with carbon conversion.Microbes play critical roles in driving enzyme activities related with carbon conversion and maintaining carbon balance in BSCs.关键词
水蚀风蚀交错区/生物结皮/土壤有机碳/土壤酶活性Key words
wind-water erosion crisscross region/biological soil crusts/soil organic carbon/soil enzyme activity分类
农业科技引用本文复制引用
武杰,张丙昌,陈静,武志芳,赵康..黄土高原水蚀风蚀交错区不同生物结皮类型对土壤有机碳及其转化的影响[J].水土保持学报,2024,38(4):38-44,54,8.基金项目
国家自然科学基金项目(42271067,U2003214) （42271067,U2003214）
