Decrease in winter respiration explains 25% of the annual northern   forest carbon sink enhancement over the last 30 years

doi:10.1111/geb.12441

CORC > 北京大学 > 城市与环境学院

	Decrease in winter respiration explains 25% of the annual northern forest carbon sink enhancement over the last 30 years
	Yu, Zhen ; Wang, Jingxin ; Liu, Shirong ; Piao, Shilong ; Ciais, Philippe ; Running, Steven W. ; Poulter, Benjamin ; Rentch, James S. ; Sun, Pengsen
刊名	GLOBAL ECOLOGY AND BIOGEOGRAPHY
	2016
关键词	Climate change ecosystem respiration net ecosystem exchange northern forests non-permafrost snow cover INCREASED SNOW DEPTH SUB-ALPINE FOREST SOIL RESPIRATION GROWING-SEASON HIGH-ELEVATION BOREAL FOREST CO2 EXCHANGE CLIMATE DIOXIDE VEGETATION
DOI	10.1111/geb.12441
英文摘要	Aim Winter snow has been suggested to regulate terrestrial carbon (C) cycling by modifying microclimate, but the impacts of change in snow cover on the annual C budget at a large scale are poorly understood. Our aim is to quantify the C balance under changing snow depth. Location Non-permafrost region of the northern forest area. Methods Here, we used site-based eddy covariance flux data to investigate the relationship between depth of snow cover and ecosystem respiration (R-eco) during winter. We then used the Biome-BGC model to estimate the effect of reductions in winter snow cover on the C balance of northern forests in the non-permafrost region. Results According to site observations, winter net ecosystem C exchange (NEE) ranged from 0.028 to 1.53 gCm(-2)day(-1), accounting for 44123% of the annual C budget. Model simulation showed that over the past 30 years, snow-driven change in winter C fluxes reduced non-growing season CO2 emissions, enhancing the annual C sink of northern forests. Over the entire study area, simulated winter R-eco significantly decreased by 0.33 gCm(-2)day(-1)year(-1) in response to decreasing depth of snow cover, which accounts for approximately 25% of the simulated annual C sink trend from 1982 to 2009. Main conclusion Soil temperature is primarily controlled by snow cover rather than by air temperature as snow serves as an insulator to prevent chilling impacts. A shallow snow cover has less insulation potential, causing colder soil temperatures and potentially lower respiration rates. Both eddy covariance analysis and model-simulated results show that both R-eco and NEE are significantly and positively correlated with variation in soil temperature controlled by variation in snow depth. Overall, our results highlight that a decrease in winter snow cover restrains global warming as less C is emitted to the atmosphere.; China National Science Foundation [31290223]; Sino-US cooperative project [2015DFA31440]; United States Department of Agriculture National Institute of Food and Agriculture [2012-6700919660]; SCI(E); ARTICLE; Jingxin.Wang@mail.wvu.edu; liusr@caf.ac.cn; 5; 586-595; 25
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438262]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Yu, Zhen,Wang, Jingxin,Liu, Shirong,et al. Decrease in winter respiration explains 25% of the annual northern forest carbon sink enhancement over the last 30 years[J]. GLOBAL ECOLOGY AND BIOGEOGRAPHY,2016.
APA	Yu, Zhen.,Wang, Jingxin.,Liu, Shirong.,Piao, Shilong.,Ciais, Philippe.,...&Sun, Pengsen.(2016).Decrease in winter respiration explains 25% of the annual northern forest carbon sink enhancement over the last 30 years.GLOBAL ECOLOGY AND BIOGEOGRAPHY.
MLA	Yu, Zhen,et al."Decrease in winter respiration explains 25% of the annual northern forest carbon sink enhancement over the last 30 years".GLOBAL ECOLOGY AND BIOGEOGRAPHY (2016).