气候变化领域集成服务门户(CCPortal): Experimental Evidence Supporting the Seasonal Availability of Water Hypothesis in a Mixed C3/C4 Grassland

CCPortal

DOI	10.1007/s10021-023-00896-4
	Experimental Evidence Supporting the Seasonal Availability of Water Hypothesis in a Mixed C3/C4 Grassland
	Hajek, Olivia L.; Sturchio, Matthew A.; Knapp, Alan K.
发表日期	2024
ISSN	1432-9840
EISSN	1435-0629
起始页码	27
结束页码	3
卷号	27 期号:3
英文摘要	Understanding how cool-season C-3 and warm-season C-4 grasses will respond to climate change is critical for predicting future ecosystem functioning in many grasslands. With warming, C-4 grasses are expected to increase relative to C-3 grasses, but alterations in the seasonal availability of water may also influence C-3/C-4 dynamics because of their distinct seasons of growth. To better understand how shifts in the seasonal availability of water can affect ecosystem function in a northern mixed-grass prairie in southeastern Wyoming, we reduced early season rainfall (April-June) using rainout shelters and added the amount of excluded precipitation later in the growing season (July-September), effectively shifting spring rainfall to summer rainfall. As expected, this shift in precipitation seasonality altered patterns of soil water availability, leading to a 29% increase in soil respiration and sustained canopy greenness throughout the growing season. Despite these responses, there were no significant differences in C-3 aboveground net primary production (ANPP) between the seasonally shifted treatment and the plots that received ambient precipitation, likely due to the high levels of spring soil moisture present before rainout shelters were deployed that sustained C-3 grass growth. However, in plots with high C-4 grass cover, C-4 ANPP increased significantly in response to increased summer rainfall. Overall, we provide the first experimental evidence that shifts in the seasonality of precipitation, with no change in temperature, will differentially impact C-3 versus C-4 species, altering the dynamics of carbon cycling in this geographically extensive semi-arid grassland.
英文关键词	seasonality; grasslands; precipitation; carbon cycling; C-3/C-4 dynamics
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001145076700002
来源期刊	ECOSYSTEMS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289630
作者单位	Colorado State University
推荐引用方式 GB/T 7714	Hajek, Olivia L.,Sturchio, Matthew A.,Knapp, Alan K.. Experimental Evidence Supporting the Seasonal Availability of Water Hypothesis in a Mixed C3/C4 Grassland[J],2024,27(3).
APA	Hajek, Olivia L.,Sturchio, Matthew A.,&Knapp, Alan K..(2024).Experimental Evidence Supporting the Seasonal Availability of Water Hypothesis in a Mixed C3/C4 Grassland.ECOSYSTEMS,27(3).
MLA	Hajek, Olivia L.,et al."Experimental Evidence Supporting the Seasonal Availability of Water Hypothesis in a Mixed C3/C4 Grassland".ECOSYSTEMS 27.3(2024).