干旱区生态环境知识资源中心(Arid): Respiration rate of moss-dominated biocrusts and their relationships with temperature and moisture in a semiarid ecosystem

Arid

DOI	10.1016/j.catena.2019.104195
	Respiration rate of moss-dominated biocrusts and their relationships with temperature and moisture in a semiarid ecosystem
	Yao, Xiaomeng 1,2; Xiao, Bo 1,2; Kidron, Giora J.3 ; Hu, Kelin 1,2
通讯作者	Xiao, Bo
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2019
卷号	183
英文摘要	Biocrusts are widely distributed throughout the world in dryland ecosystems, but their respiration rate (R-s) and responses to soil temperature and mositure have not yet been fully investigated. In a semiarid region of the Loess Plateau in China, the R-s of moss-dominated biocrusts was continuously (104 days) measured in summer through an automated soil respiration system, and their relationships with soil temperature and moisture at 2, 5, and 10 cm depths were intensively analyzed. The results showed the biocrusts had 115% higher (t = - 3.82, P < 0.001) R-s during day and 44% higher (t = -10.22, P < 0.001) R-s during night as compared with the underlying soil; they averagely increased R-s by 81% (2.52 vs. 1.39 mu mol(-2)s(-1)) across day and night. More specifically, the R-s of biocrusts ranged from 0.33 to 6.33 mu mol m(-2)s(-1) in wet conditions (soil moisture >= 0.15 cm(3) cm(-3)) and 0.27 to 2.83 mu mol m(2)s(-1) in dry conditions (soil moisture = 0.05 cm(3)cm(-3)), with a daily mean of 2.11 mu mol m(-2)s(-1). Particularly, in wet conditions the R-s of biocrusts had positive responses to increasing temperature, and their relationship was well fitted with an exponential function (R-2 <= 0.44; P < 0.001), with a Q(10) value ranging between 1.73 and 2.08. Similarly, the R-s of biocrusts was positively correlated with soil moisture, but their relationship was not well fitted with the quadratic function (R-2 <= 0.22). A model based on the soil moisture and temperature at 2 cm depth performed much better (R-2 = 0.53; P < 0.001) with R-s than that based on the soil moisture and temperature at 5 or 10 cm depth or even air temperature. In conclusion, moss biocrusts made a significant contribution to soil respiration in semiarid ecosystem, firstly (and directly) due to the rich and diversified microbial communities in biocrust layer and secondly (and indirectly) due to the biocrust effects on soil temperature and moisture regimes. The temperature and moisture at 2 cm depth (biocrust layer) should be employed with a higher priority in simulating R-s of biocrusted surfaces, rather than the commonly used soil depth (5 cm) in estimating R-s of the ordinary soil without biocrusts.
英文关键词	Biological soil crust Soil respiration Soil carbon dioxide efflux Soil temperature Soil moisture Chinese Loess Plateau
类型	Article
语种	英语
国家	Peoples R China ; Israel
收录类别	SCI-E
WOS记录号	WOS:000488417700017
WOS关键词	BIOLOGICAL SOIL CRUSTS ; CARBON-DIOXIDE EXCHANGE ; CO2 EFFLUX ; LOESS PLATEAU ; SAND DUNES ; TEMPORAL VARIATION ; WESTERN NEGEV ; DESERT ; WATER ; CYANOBACTERIA
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
EI主题词	2019-12-01
来源机构	中国农业大学 ; Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311414
作者单位	1.China Agr Univ, Coll Resources & Environm Sci, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China; 2.Minist Agr, Key Lab Arable Land Conservat North China, Beijing 100193, Peoples R China; 3.Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel
推荐引用方式 GB/T 7714	Yao, Xiaomeng,Xiao, Bo,Kidron, Giora J.,et al. Respiration rate of moss-dominated biocrusts and their relationships with temperature and moisture in a semiarid ecosystem[J]. 中国农业大学, Hebrew University of Jerusalem,2019,183.
APA	Yao, Xiaomeng,Xiao, Bo,Kidron, Giora J.,&Hu, Kelin.(2019).Respiration rate of moss-dominated biocrusts and their relationships with temperature and moisture in a semiarid ecosystem.CATENA,183.
MLA	Yao, Xiaomeng,et al."Respiration rate of moss-dominated biocrusts and their relationships with temperature and moisture in a semiarid ecosystem".CATENA 183(2019).