干旱区生态环境知识资源中心(Arid): Temporal accumulation and lag effects of precipitation on carbon fluxes in terrestrial ecosystems across semi-arid regions in China

Arid

DOI	10.1016/j.agrformet.2024.110189
	Temporal accumulation and lag effects of precipitation on carbon fluxes in terrestrial ecosystems across semi-arid regions in China
	Gong, Haixing; Wang, Guoyin; Fan, Chenqing; Zhuo, Xianwang; Sha, Lina; Kuang, Zexing; Bi, Jianrong; Cheng, Tiantao
通讯作者	Wang, GY ; Cheng, TT
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2024
卷号	356
英文摘要	Precipitation (PRE) plays a vital role in hydrological processes, ecological vegetation, and land-atmosphere interactions in semi-arid regions. Previous research has mainly focused on the impact of PRE on large-scale regional climate change and ecological evolution. However, there have been few studies on the long-term effects of PRE on carbon fluxes in these regions, especially the time-accumulation and-lag effects. Here, we employed observational data from the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) and integrated multiple data sources, including remote sensing and carbon flux simulation data, to quantitatively assess the lagged response of carbon fluxes to PRE and elucidate the underlying mechanisms from multiple perspectives. Characterization of PRE, soil water content (SWC) and carbon fluxes at SACOL qualitatively reveals the existence of a time-delayed response of carbon fluxes to PRE, both on monthly and finer daily temporal scales. The average lagged response of net ecosystem exchange (NEE) and gross primary productivity (GPP) to accumulated PRE (APRE) is approximately 42 days. When considering time-accumulation and-lag effects, the combined direct and indirect effects of APRE on NEE and GPP increase by 0.37 and 0.58, respectively. Notably, preceding APRE primarily exerts a direct effect on current carbon fluxes, whereas the impact of SWC at a depth of 0.1 m is primarily mediated through the memory effect of preceding APRE, resulting in an indirect effect on carbon fluxes. These findings emphasize the importance of preceding APRE. Significantly, our subsequent study indicates that the delay in NEE and GPP responses to APRE also extends to approximately 40 to 50 days at the regional scale. Our findings emphasize the significant time effects of APRE on carbon fluxes, and considering these effects will contribute to a better understanding of the interplay between PRE and vegetation over semi-arid regions in China.
英文关键词	Semi-arid regions Precipitation Carbon fluxes Time-accumulation and -lag effects Direct and indirect effects
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001295826300001
WOS关键词	LOESS PLATEAU ; SOIL-MOISTURE ; ENERGY-BALANCE ; NET CO2 ; RESPIRATION ; TEMPERATURE ; EXCHANGE ; HEAT ; DROUGHT ; IMPACTS
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402639
推荐引用方式 GB/T 7714	Gong, Haixing,Wang, Guoyin,Fan, Chenqing,et al. Temporal accumulation and lag effects of precipitation on carbon fluxes in terrestrial ecosystems across semi-arid regions in China[J],2024,356.
APA	Gong, Haixing.,Wang, Guoyin.,Fan, Chenqing.,Zhuo, Xianwang.,Sha, Lina.,...&Cheng, Tiantao.(2024).Temporal accumulation and lag effects of precipitation on carbon fluxes in terrestrial ecosystems across semi-arid regions in China.AGRICULTURAL AND FOREST METEOROLOGY,356.
MLA	Gong, Haixing,et al."Temporal accumulation and lag effects of precipitation on carbon fluxes in terrestrial ecosystems across semi-arid regions in China".AGRICULTURAL AND FOREST METEOROLOGY 356(2024).