Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China

doi:10.1016/j.agrformet.2016.06.020

NWIPB OpenIR

	Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China
	Li, Hongqin 1; Zhang, Fawei 1,3; Li, Yingnian 1; Wang, Junbang 2; Zhang, Leiming 2; Zhao, Liang 1; Cao, Guangmin 1; Zhao, Xinquan 1; Du, Mingyuan 4
	2016-11-15
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
卷号	228 页码:95-103
文章类型	Article
摘要	Alpine ecosystems play an important role in the global carbon cycle, yet the long-term response of in situ ground-based observations of carbon fluxes to climate change remains not fully understood. Here, we analyzed the continuous net ecosystem CO2 exchange (NEE) measured with the eddy covariance technique over an alpine Potentilla fruticosa shrubland on the northeastern Qinghai-Tibetan Plateau from 2003 to 2012. The shrubland acted as a net CO2 sink with a negative NEE (-74.4 +/- 12.7 g C m(-2) year(-1), Mean +/- S.E.). The mean annual gross primary productivity (GPP) and annual ecosystem respiration (RES) were 511.8 +/- 11.3 and 437.4 +/- 17.8 g Cm-2 year(--1), respectively. The classification and regression trees (CART) analysis showed that aggregated growing season degree days (GDD) was the predominant determinant on variations in monthly NEE and monthly GPP, including its effect on leaf area index (LAI, satellite-retrieved data). However, variations in monthly RES were determined much more strongly by LAI. Non-growing season soil temperature (T-s) and growing season length (GSL) accounted for 59% and 42% of variations in annual GPP and annual NEE, respectively. Growing season soil water content (SWC) exerted a positive linear influence on variations in annual RES (r(2) = 0.40, p = 0.03). The thermal conditions and soil water status during the onset of the growing season are crucial for inter-annual variations of carbon fluxes. Our results suggested that an extended growing season and warmer non-growing season would enhance carbon assimilation capacity in the alpine shrubland. (C) 2016 Elsevier B.V. All rights reserved.
关键词	Ecosystem Respiration Gross Primary Production Growing Season Length Aggregated Growing Season Degree Days Classification And Regression Trees
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI	10.1016/j.agrformet.2016.06.020
关键词[WOS]	GRASSLAND ECOSYSTEMS ; VEGETATION GROWTH ; GROWING-SEASON ; ARCTIC TUNDRA ; EXCHANGE ; CARBON ; VARIABILITY ; RESPONSES ; MEADOW ; WINTER
收录类别	SCI
语种	英语
项目资助者	Strategic Priority Research Program (B) of Chinese Academy of Sciences(XDB03030502) ; National Natural Science Foundation of China(31270520 ; International Cooperation Research Program of Qinghai Province(2015-HZ-804) ; 31300385 ; 31270523)
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000383295200009
引用统计	被引频次：68[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/6453
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
推荐引用方式 GB/T 7714	Li, Hongqin,Zhang, Fawei,Li, Yingnian,et al. Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China[J]. AGRICULTURAL AND FOREST METEOROLOGY,2016,228:95-103.
APA	Li, Hongqin.,Zhang, Fawei.,Li, Yingnian.,Wang, Junbang.,Zhang, Leiming.,...&Du, Mingyuan.(2016).Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China.AGRICULTURAL AND FOREST METEOROLOGY,228,95-103.
MLA	Li, Hongqin,et al."Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China".AGRICULTURAL AND FOREST METEOROLOGY 228(2016):95-103.