干旱区生态环境知识资源中心(Arid): Biotic and Abiotic Contribution to Diurnal Soil CO2 Fluxes from Saline/Alkaline Soils

Arid

DOI	10.1038/s41598-020-62209-2
	Biotic and Abiotic Contribution to Diurnal Soil CO2 Fluxes from Saline/Alkaline Soils
	Wang, Zhong-Yuan; Xie, Jiang-Bo; Wang, Yu-Gang; Li, Yan
通讯作者	Xie, JB
来源期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
出版年	2020
卷号	10 期号:1
英文摘要	As the second largest carbon flux in terrestrial ecosystems, the soil CO2 flux is closely related to the atmospheric CO2 concentration. The soil CO2 flux is the sum of biotic respiration and abiotic geochemical CO2 exchange; however, little is known about abiotic CO2 fluxes in arid areas. To investigate the relative contribution of abiotic and biotic soil CO2 fluxes over a diurnal course, the abiotic CO2 flux was distinguished by autoclaving sterilization in both saline and alkaline soils at an arid site in northwestern China. The results demonstrated that: (1) Over the diurnal course, the abiotic CO2 was a significant component of the soil CO2 flux in both saline and alkaline soil, which accounted for more than 56% of the diurnal soil CO2 flux. (2) There was a dramatic difference in the temperature response between biotic and abiotic CO2 fluxes: the response curves of biotic respiration were exponential in the saline soil and quadratic in the alkaline soil, while the abiotic CO2 flux was linearly correlated with soil temperature. They were of similar magnitude but with opposite signs: resulting in almost neutral carbon emissions on daily average. (3) Due to this covering up effect of the abiotic CO2 flux, biotic respiration was severely underestimated (directly measured soil CO2 flux was only one-seventh of the biotic CO2 flux in saline soil, and even an order of magnitude lower in alkaline soil). In addition, the soil CO2 flux masked the temperature-inhibition of biotic respiration in the alkaline soil, and veiled the differences in soil biological respiration between the saline and alkaline soils. Hence, the soil CO2 flux may not be an ideal representative of soil respiration in arid soil. Our study calls for a reappraisal of the definition of the soil CO2 flux and its temperature dependence in arid or saline/alkaline land. Further investigations of abiotic CO2 fluxes are needed to improve our understanding of arid land responses to global warming and to assist in identifying the underlying abiotic mechanisms.
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000560013900020
WOS关键词	CARBON-DIOXIDE FLUX ; MOJAVE-DESERT ; TERRESTRIAL ECOSYSTEMS ; NET ECOSYSTEM ; RESPIRATION ; TEMPERATURE ; FEEDBACKS ; EFFLUX ; HIDDEN ; SCALE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325643
作者单位	[Wang, Zhong-Yuan; Xie, Jiang-Bo; Li, Yan] Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Linan 311300, Peoples R China; [Wang, Yu-Gang; Li, Yan] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; [Wang, Yu-Gang; Li, Yan] Chinese Acad Sci, Fukang Stn Desert Ecol, Fukang 831505, Xinjiang, Peoples R China
推荐引用方式 GB/T 7714	Wang, Zhong-Yuan,Xie, Jiang-Bo,Wang, Yu-Gang,et al. Biotic and Abiotic Contribution to Diurnal Soil CO2 Fluxes from Saline/Alkaline Soils[J]. 中国科学院新疆生态与地理研究所,2020,10(1).
APA	Wang, Zhong-Yuan,Xie, Jiang-Bo,Wang, Yu-Gang,&Li, Yan.(2020).Biotic and Abiotic Contribution to Diurnal Soil CO2 Fluxes from Saline/Alkaline Soils.SCIENTIFIC REPORTS,10(1).
MLA	Wang, Zhong-Yuan,et al."Biotic and Abiotic Contribution to Diurnal Soil CO2 Fluxes from Saline/Alkaline Soils".SCIENTIFIC REPORTS 10.1(2020).