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	Soil Respiration of Biologically-Crusted Soils in Response to Simulated Precipitation Pulses in the Tengger Desert, Northern China
	Li Xiaojun; Zhao Yang; Yang Haotian; Zhang Peng; Gao Yongping
刊名	PEDOSPHERE
	2018-02-01
卷号	28期号:1页码:103-113
关键词	biological soil crusts C cycling CO2 emission desert ecosystem precipitation amount soil water content
ISSN号	1002-0160
DOI	10.1016/S1002-0160(17)60307-2
通讯作者	Li Xiaojun(xiaojunli@lzb.ac.cn)
英文摘要	Soil respiration (SR) is a major process of carbon loss from dryland soils, and it is closely linked to precipitation which often occurs as a discrete episodic event. However, knowledge on the dynamic patterns of SR of biologically-crusted soils in response to precipitation pulses remains limited. In this study, we investigated CO2 emissions from a moss-crusted soil (MCS) and a cyanobacteria-lichen-crusted soil (CLCS) after 2, 4, 8, 16, and 32 mm precipitation during the dry season in the Tengger Desert, northern China. Results showed that 2 h after precipitation, the SR rates of both MCS and CLCS increased up to 18-fold compared with those before rewetting, and then gradually declined to background levels; the decrease was faster at lower precipitation amount and slower at higher precipitation amount. The peak and average SR rates over the first 2 h in MCS increased with increasing precipitation amount, but did not vary in CLCS. Total CO2 emission during the experiment (72 h) ranged from 1.35 to 5.67 g C m(-2) in MCS, and from 1.11 to 3.19 g C m(-2) in CLCS. Peak and average SR rates, as well as total carbon loss, were greater in MCS than in CLCS. Soil respiration rates of both MCS and CLCS were logarithmically correlated with gravimetric soil water content. Comparisons of SR among different precipitation events, together with the analysis of long-term precipitation data, suggest that small-size precipitation events have the potential for large short-term carbon losses, and that biological soil crusts might significantly contribute to soil CO2 emission in the water-limited desert ecosystem.
收录类别	SCI
WOS关键词	CARBON-DIOXIDE FLUXES ; SONORAN DESERT ; CO2 EFFLUX ; COMMUNITY COMPOSITION ; SEMIARID ECOSYSTEMS ; CLIMATE-CHANGE ; WATER ; STEPPE ; REVEGETATION ; RAINFALL
WOS研究方向	Agriculture
WOS类目	Soil Science
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000433154600009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557823
专题	寒区旱区环境与工程研究所
通讯作者	Li Xiaojun
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Shapotou Desert Res & Expt Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Li Xiaojun,Zhao Yang,Yang Haotian,et al. Soil Respiration of Biologically-Crusted Soils in Response to Simulated Precipitation Pulses in the Tengger Desert, Northern China[J]. PEDOSPHERE,2018,28(1):103-113.
APA	Li Xiaojun,Zhao Yang,Yang Haotian,Zhang Peng,&Gao Yongping.(2018).Soil Respiration of Biologically-Crusted Soils in Response to Simulated Precipitation Pulses in the Tengger Desert, Northern China.PEDOSPHERE,28(1),103-113.
MLA	Li Xiaojun,et al."Soil Respiration of Biologically-Crusted Soils in Response to Simulated Precipitation Pulses in the Tengger Desert, Northern China".PEDOSPHERE 28.1(2018):103-113.

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