Temporal evolution of the hydromechanical properties of soil-root systems in a forest fire in China
文献类型:期刊论文
作者 | Lei, Mingyu2,4; Cui, Yifei3; Ni, Junjun1; Zhang, Guotao5; Li, Yao2,4; Wang, Hao5; Liu, Dingzhu2,4; Yi, Shujian2,4; Jin, Wen2,4; Zhou, Liqin2,4 |
刊名 | SCIENCE OF THE TOTAL ENVIRONMENT |
出版日期 | 2022-02-25 |
卷号 | 809页码:13 |
ISSN号 | 0048-9697 |
关键词 | Wildfire Vegetation Hydro-mechanical characteristics Time-dependent |
DOI | 10.1016/j.scitotenv.2021.151165 |
通讯作者 | Cui, Yifei(yifeicui@mail.tsinghua.edu.cn) ; Ni, Junjun(cenijj@ust.hk) |
英文摘要 | Y Plant roots generally enhance soil strength and stabilize slopes through hydro-mechanical effects, especially in forested areas prone to shallow slope failure. Forest fires can severely weaken the hydro-mechanical contribution of roots to slopes, however, the hydro-mechanical characteristics of soil-root systems (SRS) affected by wildfire remain poorly understood. To obtain insight into the post-fire hydro-mechanical characteristics of SRS, a subalpine conifer forested area in Sichuan Province, China that suffered a wildfire on March 30, 2019 was continuously monitored over two consecutive years. Samples from zones with different degrees of burn severity were collected and tests both for roots and SRS were performed. The results revealed a substantial decline in root number, which decreased by 46%-58% two years after the wildfire in the medium- and high-severity areas. The tensile strength tests indicated a reduction of root tensile strength by 36%-47% for roots with diameters less than 2 mm. The shear strength of the SRS determined from saturated direct shear tests strongly and had degraded by 55%-82% two years after the wildfire because of root death and reduced root reinforcement. The results of hydraulic conductivity tests over the same time period indicated an abrupt reduction of SRS hydraulic conductivity within several months after the fire owing to ash clogging and the formation of a hydrophobic layer. After more time had elapsed, however, hydraulic conductivity had increased unexpectedly by a factor of 2.2-3.2 greater than that of unburned soil. We attribute this observation to the form ation of macropore flow pathways from decayed roots, which was observed by scanning electron microscopy. The findings presented here provide important insight into the temporal changes of the hydro-mechanical characteristics of SRS in burned areas and their associated mechanisms and could be a useful reference to better evaluate post-wildfire stability of subalpine conifer forest in similar environmental conditions. (C) 2021 Elsevier B.V. All rights reserved. |
WOS关键词 | SHORT-TERM CHANGES ; WATER REPELLENCY ; ORGANIC-MATTER ; REINFORCEMENT DYNAMICS ; HILLSLOPE EROSION ; POSTFIRE RUNOFF ; BURN SEVERITY ; OVERLAND-FLOW ; WILDFIRE ; INFILTRATION |
资助项目 | National Natural Science Foundation of China[41941019] ; National Natural Science Foundation of China[41790432] ; National Natural Science Foundation of China[42077238] ; National Natural Science Foundation of China[42120104002] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA23090303] ; Research Fund Program of the State Key Laboratory of Hydroscience and Engineering[2020-KY-04] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0906] |
WOS研究方向 | Environmental Sciences & Ecology |
语种 | 英语 |
出版者 | ELSEVIER |
WOS记录号 | WOS:000743255100010 |
资助机构 | National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Research Fund Program of the State Key Laboratory of Hydroscience and Engineering ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/170212] |
专题 | 中国科学院地理科学与资源研究所 |
通讯作者 | Cui, Yifei; Ni, Junjun |
作者单位 | 1.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China 2.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 3.Tsinghua Univ, State Key Lab Hydrosdence & Engn, Beijing 100084, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China |
推荐引用方式 GB/T 7714 | Lei, Mingyu,Cui, Yifei,Ni, Junjun,et al. Temporal evolution of the hydromechanical properties of soil-root systems in a forest fire in China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,809:13. |
APA | Lei, Mingyu.,Cui, Yifei.,Ni, Junjun.,Zhang, Guotao.,Li, Yao.,...&Zhou, Liqin.(2022).Temporal evolution of the hydromechanical properties of soil-root systems in a forest fire in China.SCIENCE OF THE TOTAL ENVIRONMENT,809,13. |
MLA | Lei, Mingyu,et al."Temporal evolution of the hydromechanical properties of soil-root systems in a forest fire in China".SCIENCE OF THE TOTAL ENVIRONMENT 809(2022):13. |
入库方式: OAI收割
来源:地理科学与资源研究所
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