Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem
文献类型：期刊论文
| 作者 | Xiao, Bo1,2,3; Bowker, Matthew A.4 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2020-11-01 |
| 卷号 | 741页码:15 |
| 关键词 | Biological soil crust Microbiotic crust Soil re flectance Solar radiation balance Soil temperature Chinese Loess Plateau |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2020.140425 |
| 通讯作者 | Xiao, Bo(xiaobo@cau.edu.cn) |
| 英文摘要 | Land surface albedo measures the degree to which the sun's radiation is absorbed or reflected, and thus can be highly influential in global climate trends, local weather phenomena, and biological processes. As an extensive living cover in drylands, biocrusts cover substantial land surface but their potential influences on surface albedo and energy balance are underdocumented, and its temporal dynamic is virtually unknown. We continuously measured the surface albedo, land-surface energy balance, temperature and moisture of moss-biocrust covered soil and bare soil for two years, and measured the surface color and roughness of the two land cover types. Our results showed that the surface albedo of the biocrusts was 43.4% lower than that of the bare soil, due to the increased darkness (43.7%) and roughness (90.4%) together with increased moisture (20.7%) of the biocrust layer. Through time, the albedo of the biocrusts were negatively and linearly related with surface soil temperature or moisture, which resulted in lower albedo in summer and higher albedo in other seasons. As a result of decreased albedo, biocrusts decreased outgoing short-wave radiation by 44.8% in comparison to the bare soil, and consequently they increased net short-wave radiation by 11.4% and net all-wave solar radiation by 22.9% However, the increased energy absorption by the biocrusts did not consistently increase soil temperature; instead, soil temperature increased by up to 9.3 degrees C under dry conditions but decreased by as much as 11.4 degrees C under wet conditions, resulting in a net cooling. This indicates that the temperature regimes of the biocrust-covered soil were not determined only by albedo, but also by modification of soil thermal properties by biocrusts. Because biocrusts are highly responsive to land use, it appears that altered albedo and energy balance may be one of the ways in which human activity can impact climate and weather. (C) 2020 Elsevier B.V. All rights reserved. |
| WOS关键词 | LOESS PLATEAU ; SAND DUNES ; SPECTRAL REFLECTANCE ; CRUSTS ; DESERT ; MOISTURE ; TEMPERATURE ; WATER ; EVAPORATION ; DESERTIFICATION |
| 资助项目 | National Natural Science Foundation of China[41671221] ; China Scholarship Council[201906355019] ; Light of West China Program of the Chinese Academy of Sciences[2019] ; National Science Foundation Dimensions of Biodiversity Program[1638966] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000568814100003 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; China Scholarship Council ; Light of West China Program of the Chinese Academy of Sciences ; National Science Foundation Dimensions of Biodiversity Program |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/156911]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Xiao, Bo |
| 作者单位 | 1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.China Agr Univ, Coll Land Sci & Technol, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China 3.Minist Agr & Rural Affairs, Key Lab Arabie Land Conservat North China, Beijing 100193, Peoples R China 4.No Arizona Univ, Sch Forestry, Flagstaff, AZ 86011 USA |
| 推荐引用方式 GB/T 7714 | Xiao, Bo,Bowker, Matthew A.. Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,741:15. |
| APA | Xiao, Bo,&Bowker, Matthew A..(2020).Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem.SCIENCE OF THE TOTAL ENVIRONMENT,741,15. |
| MLA | Xiao, Bo,et al."Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem".SCIENCE OF THE TOTAL ENVIRONMENT 741(2020):15. |
入库方式： OAI收割
来源：地理科学与资源研究所
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