干旱区生态环境知识资源中心(Arid): Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions

Arid

DOI	10.3389/fevo.2021.673310
	Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions
	Jiang, Zhaoxia; Bian, Hongfeng; Xu, Li; Li, Mingxu; He, Nianpeng
通讯作者	Bian, HF (corresponding author), Northeast Normal Univ, State Environm Protect Key Lab Wetland Ecol & Veg, Sch Environm, Changchun, Peoples R China. ; He, NP (corresponding author), Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China. ; He, NP (corresponding author), Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China. ; He, NP (corresponding author), Northeast Normal Univ, Inst Grassland Sci, Minist Educ, Key Lab Vegetat Ecol, Changchun, Peoples R China.
来源期刊	FRONTIERS IN ECOLOGY AND EVOLUTION
ISSN	2296-701X
出版年	2021
卷号	9
英文摘要	The rapid and strong release of CO2 caused by precipitation (known as the pulse effect) is a common phenomenon that significantly affects ecosystem C cycling. However, the degree to which the pulse effect occurs overlarge regional scales remains unclear. In this study, we conducted continuous and high-frequency measurements of soil CO2 release rates (R-s) for 48 h after simulated precipitation, along a precipitation gradient of different grassland types (i.e., meadow, typical, and desert) in Inner Mongolia, China. Pulse effects were assessed using the maximum R-s (Rsoil-max) and accumulated CO2 emissions (A(Rs-soil)). Strong precipitation pulse effects were found in all sites; however, the effects differed among grassland types. In addition, an apparent decrease in both Rsoil-max and A(Rs-soil) was observed from the east to west, i.e., along the decreasing precipitation gradient. A(Rs-soil) values followed the order: temperate meadow grassland (0.097 mg C g(-1) soil) > typical temperate grassland (0.081 mg C g(-1) soil) > temperate desert grassland (0.040 mg C g(-1) soil). Furthermore, Rsoil-max and A(Rs-soil) were significantly positively correlated with soil quality (SOC, POC, and N, etc.; P < 0.01). A(Rs-soil) (P < 0.05) and A(Rs-SOC) (P < 0.01) were significantly affected. A(Rs-soil) and A(Rs-SOC) were also positively correlated with soil microbial biomass significantly (P < 0.05). Rsoil-max and A(Rs-soil) had similar spatial variations and controlling mechanisms. These results greatly support the substrate supply hypothesis for the effects of precipitation pulses, and provide valuable information for predicting CO2 emissions. Our findings also verified the significant effect of soil CO2 release from precipitation pulses on the grasslands of arid and semi-arid regions. Our data provide a scientific basis for model simulations to better predict the responses of ecosystem carbon cycles in arid and semi-arid regions under predicted climate change scenarios.
英文关键词	carbon cycle soil organic matter decomposition precipitation gradient pulse effect grassland
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000659092500001
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; MICROBIAL RESPIRATION ; TEMPERATURE SENSITIVITY ; N-MINERALIZATION ; CO2 FLUX ; GRASSLAND ; RESPONSES ; COMMUNITIES ; GRADIENT ; DROUGHT
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350285
作者单位	[Jiang, Zhaoxia; Bian, Hongfeng] Northeast Normal Univ, State Environm Protect Key Lab Wetland Ecol & Veg, Sch Environm, Changchun, Peoples R China; [Xu, Li; Li, Mingxu; He, Nianpeng] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China; [He, Nianpeng] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China; [He, Nianpeng] Northeast Normal Univ, Inst Grassland Sci, Minist Educ, Key Lab Vegetat Ecol, Changchun, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Zhaoxia,Bian, Hongfeng,Xu, Li,et al. Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions[J]. 中国科学院地理科学与资源研究所,2021,9.
APA	Jiang, Zhaoxia,Bian, Hongfeng,Xu, Li,Li, Mingxu,&He, Nianpeng.(2021).Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions.FRONTIERS IN ECOLOGY AND EVOLUTION,9.
MLA	Jiang, Zhaoxia,et al."Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions".FRONTIERS IN ECOLOGY AND EVOLUTION 9(2021).