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Effect of crevice density on biological soil crust development on rock cut slope in mountainous regions,Sichuan,China

引用

Ecological Processes 2023年第1期12卷 46-63页

作者： Maoqiang Zhao Wanqiu Pu Jie Du Wenhu Liu Qian Zhang Yanmei Liu Li Xiao Yingwei Ai Chengmin Huang Department of Environmental Science and Engineering Sichuan UniversityNo.24 South Section 1Yihuan RoadChengdu 610065China Jiuzhaigou Administration Bureau Jiuzhaigou 623402SichuanChina School of Life Science Sichuan UniversityChengdu 610064SichuanChina Sichuan Institute of Geological Engineering Investigation Group Co. Ltd.Chengdu 610072SichuanChina

Background The rock cut slope(RCS)could cause damage to regional ecological functions and landscapes and requires *** soil crusts(BSCs)are pioneer and dominant colonizers during the initial recovery *** accelerate the natural recovery of RCS,the development process and influencing agents of BSC should be ***,the area index of crevices(IR),BSC coverage(COV)and biomass(BM),soil weight(SW),and major soil nutrients[organic carbon(OC),total nitrogen(TN)and total phosphorus(TP)]content,collected from 164 quadrats on 13 RCSs in the mountainous area of west Sichuan Province,China,were measured,to explore the effect of crevice of RCS on BSC *** Soil OC,TN and TP on RCSs ranged from 18.61 to 123.03 g kg^(-1),0.96 to 6.02 g kg^(-1)and 0.52 to 2.46 g kg^(-1),respectively,and were approximately to or higher than those on natural *** OC,TN and TP contents in soils elevated unsystematically with recovery time of *** on RCS distributed along crevices generally and *** the first 13 years of natural recovery,COV,BM and SW ranged from 6.5 to 28.2%,14.43 to 67.25 g m^(-2),and 127.69 to 1277.74 g m^(-2),***,BM and SW increased linearly with IR on *** positive correlation between COV and BM and IR was insignificantly impacted by bedrock,slope aspect and altitude within the recovery time less than 13 *** and BM on RCSs increased significantly when the recovery time is more than 27 *** crevice on RCSs could be a major environmental factor which is conducive to BSC development and soil accumulation through creating a space for water and soil ***,with the increase of recovery time of RCSs,BSCs may grow and reach a stable state with the promotion of soil nutrients,plant growth and microbial *** results provide a development process of BSC that from inside to outside the crevices on *** the areas with stable rock strata and a low risk of geological disast

关键词： Rock cut slope crevice density Natural recovery Biological soil crust Soil organic carbon Soil total nitrogen Soil total phosphorus

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