干旱区生态环境知识资源中心(Arid): Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem

Arid

DOI	10.1016/j.scitotenv.2020.140425
	Moss-biocrusts strongly decrease soil surface albedo, altering land-surface energy balance in a dryland ecosystem
	Xiao, Bo; Bowker, Matthew A.
通讯作者	Xiao, B
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	741
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.
英文关键词	Biological soil crust Microbiotic crust Soil re flectance Solar radiation balance Soil temperature Chinese Loess Plateau
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000568814100003
WOS关键词	LOESS PLATEAU ; SAND DUNES ; SPECTRAL REFLECTANCE ; CRUSTS ; DESERT ; MOISTURE ; TEMPERATURE ; WATER ; EVAPORATION ; DESERTIFICATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	西北农林科技大学 ; 中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326234
作者单位	[Xiao, Bo] China Agr Univ, Coll Land Sci & Technol, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China; [Xiao, Bo] Minist Agr & Rural Affairs, Key Lab Arabie Land Conservat North China, Beijing 100193, Peoples R China; [Xiao, Bo] 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; [Bowker, Matthew A.] 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]. 西北农林科技大学, 中国农业大学,2020,741.
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.
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).