干旱区生态环境知识资源中心(Arid): Response of abiotic soil CO2 flux to the difference in air-soil temperature in a desert

Arid

DOI	10.1016/j.scitotenv.2021.147377
	Response of abiotic soil CO2 flux to the difference in air-soil temperature in a desert
	Gao, Yang; Zhao, Zhong; Zhang, Yuqing; Liu, Jiabin
通讯作者	Liu, JB (corresponding author), Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	785
英文摘要	Abiotic soil CO2 flux (F-a) has been observed in drylands worldwide, while its generation mechanismis not determined. The remarkable features for the occurrence time of F-a, that the positive F-a (CO2 emission from soil) and negative F-a (CO2 absorption by soil) generally occurred in the daytime and nighttime, respectively, suggested that the generation of Fa is related to temperature. Previous studies have focused on the sole effect of soil temperature (T-s) or air temperature (T-a) on F-a, but very little is regarding to the overall response of F-a to both T-a and T-s in the air-soil system. In theMu Us Desert, China, we continuously measured the hourly F-a, T-s, T-a and the difference between T-a and T-s (T-a-T-s) at 4-day intervals from June to October 2016. During this period, soil abiotically absorbed atmospheric CO2 at a rate of 0.32 +/- 0.19 gm(-2) d(-1). F-a was not correlated with T-s and was weakly correlated with T-a, however, it was strongly and positively correlated with T-a-T-s. A quadratic model adequately fitted the relationship between F-a and T-a-T-s, and similar relationships were also observed between positive F-a and T-a-T-s and between negative F-a and T-a-T-s. The results of F-a measurement highlight that desert soils can absorb CO2 from the atmosphere through abiotic processes. The relationships of F-a with T-s, T-a and T-a-T-s indicate that, abiotic CO2 exchange between soil and atmosphere depends on air-soil temperature gradient in desert. Furthermore, the thermal convection driven by T-a-T-s may play a major role in the generation of nocturnal negative F-a. Our findings provide a new possible perspective for revealing the reasons of F-a generation in drylands. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Abiotic CO2 absorption Soil temperature Air temperature Air-soil temperature gradient Desert soil
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000659453200002
WOS关键词	NET ECOSYSTEM ; SEMIARID SHRUBLAND ; CARBON ; EXCHANGE ; ATMOSPHERE ; RESPIRATION ; HIDDEN ; WINTER
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 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351681
作者单位	[Gao, Yang; Liu, Jiabin] Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China; [Gao, Yang; Zhao, Zhong] Northwest A&F Univ, Coll Forestry, Yangling 712100, Shaanxi, Peoples R China; [Zhang, Yuqing] Beijing Forestry Univ, Yanchi Res Stn, Sch Soil & Water Conservat, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Gao, Yang,Zhao, Zhong,Zhang, Yuqing,et al. Response of abiotic soil CO2 flux to the difference in air-soil temperature in a desert[J]. 西北农林科技大学, 北京林业大学,2021,785.
APA	Gao, Yang,Zhao, Zhong,Zhang, Yuqing,&Liu, Jiabin.(2021).Response of abiotic soil CO2 flux to the difference in air-soil temperature in a desert.SCIENCE OF THE TOTAL ENVIRONMENT,785.
MLA	Gao, Yang,et al."Response of abiotic soil CO2 flux to the difference in air-soil temperature in a desert".SCIENCE OF THE TOTAL ENVIRONMENT 785(2021).