气候变化领域集成服务门户(CCPortal): Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland

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DOI	10.1088/1748-9326/ab1c91
	Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland
	Leffler A.J.; Beard K.H.; Kelsey K.C.; Choi R.T.; Schmutz J.A.; Welker J.M.
发表日期	2019
ISSN	17489318
卷号	14 期号:8
英文摘要	Rapid warming in northern ecosystems over the past four decades has resulted in earlier spring, increased precipitation, and altered timing of plant-animal interactions, such as herbivory. Advanced spring phenology can lead to longer growing seasons and increased carbon (C) uptake. Greater precipitation coincides with greater cloud cover possibly suppressing photosynthesis. Timing of herbivory relative to spring phenology influences plant biomass. None of these changes are mutually exclusive and their interactions could lead to unexpected consequences for Arctic ecosystem function. We examined the influence of advanced spring phenology, cloud cover, and timing of grazing on C exchange in the Yukon-Kuskokwim Delta of western Alaska for three years. We combined advancement of the growing season using passive-warming open-top chambers (OTC) with controlled timing of goose grazing (early, typical, and late season) and removal of grazing. We also monitored natural variation in incident sunlight to examine the C exchange consequences of these interacting forcings. We monitored net ecosystem exchange of C (NEE) hourly using an autochamber system. Data were used to construct daily light curves for each experimental plot and sunlight data coupled with a clear-sky model was used to quantify daily and seasonal NEE over a range of incident sunlight conditions. Cloudy days resulted in the largest suppression of NEE, reducing C uptake by approximately 2 g C m-2 d-1 regardless of the timing of the season or timing of grazing. Delaying grazing enhanced C uptake by approximately 3 g C m-2 d-1. Advancing spring phenology reduced C uptake by approximately 1.5 g C m-2 d-1, but only when plots were directly warmed by the OTCs; spring advancement did not have a long-term influence on NEE. Consequently, the two strongest drivers of NEE, cloud cover and grazing, can have opposing effects and thus future growing season NEE will depend on the magnitude of change in timing of grazing and incident sunlight. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Arctic ecosystem; cloud cover; grazing; herbivory; migratory geese; net ecosystem exchange; phenological mismatch
语种	英语
scopus关键词	Biology; Climate change; Precipitation (meteorology); Timing circuits; Cloud cover; grazing; Herbivory; migratory geese; Net ecosystem exchange; phenological mismatch; Ecosystems; cloud cover; growing season; herbivory; light availability; migratory population; net ecosystem exchange; phenology; plant-herbivore interaction; spring (season); Alaska; Arctic; United States; Yukon-Kuskokwim Delta; Animalia; Anser
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154445
作者单位	Department of Natural Resource Management, South Dakota State University, Brookings, SD 57006, United States; Department of Wildland Resources, Utah State University, Ecology Center, Logan, UT 84322-5230, United States; Department of Biological Sciences, University of Alaska-Anchorage, Anchorage, AK 99508, United States; US Geological Survey Alaska Science Center, Anchorage, AK 99508, United States; UArctic, Ecology and Genetics Research Unit, University of Oulu, Finland
推荐引用方式 GB/T 7714	Leffler A.J.,Beard K.H.,Kelsey K.C.,et al. Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland[J],2019,14(8).
APA	Leffler A.J.,Beard K.H.,Kelsey K.C.,Choi R.T.,Schmutz J.A.,&Welker J.M..(2019).Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland.Environmental Research Letters,14(8).
MLA	Leffler A.J.,et al."Cloud cover and delayed herbivory relative to timing of spring onset interact to dampen climate change impacts on net ecosystem exchange in a coastal Alaskan wetland".Environmental Research Letters 14.8(2019).