Dynamics of Postfire Aboveground Carbon in a Chronosequence of Chinese Boreal Larch Forests

doi:10.1029/2018JG004702

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	Dynamics of Postfire Aboveground Carbon in a Chronosequence of Chinese Boreal Larch Forests
	Yang, Yuan Z.1,3,4; Cai, Wen H.1,3; Yang, Jian 2; White, Megan 2; Lhotka, John M.2
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
	2018-12-01
卷号	123 期号:12 页码:3490-3506
关键词	aboveground carbon postfire carbon dynamics stand density boreal larch forests ecosystem resilience
ISSN号	2169-8953
DOI	10.1029/2018JG004702
通讯作者	Yang, Jian(jian.yang@uky.edu)
英文摘要	Boreal forests store a large proportion of the global terrestrial carbon (C), while wildfire plays a crucial role in determining their C storage and dynamics. The aboveground C (AC) pool is an important component of forest C stocks. To quantify the turning point (transforming from C source to C sink) and recovery time of postfire AC, and assess how stand density affects the AC, 175 plots from eight stand age classes were surveyed as a chronosequence in the Great Xing'an Mountains of Northeast China. Linear and nonlinear regression analyses were conducted to describe postfire AC recovery patterns. The results showed that (1) postfire AC exhibited a skewed U-shaped pattern with the turning point at approximately year 30, when the change rate of AC shifted from negative to positive, (2) it took more than 120years for this forest ecosystem to recover 80% of AC in unburned old-growth (200years) stands, and (3) there was an overall positive relationship between AC and stand density over the entire range of stand age classes; and such relationship was stronger during the early- and late-successional stages, but weaker (p>0.05) during the midsuccessional stage. Although boreal larch forests have been C sinks under historical fire free intervals, predicted increases in fire frequency could potentially shift it to a C source. Understanding postfire AC dynamics in boreal larch forests is central to predicting C cycling response to wildfire and provides a framework for assessing ecosystem resilience to disturbance in this region. Plain Language Summary Boreal forests store more than 32% of total global forest carbon (C), but this C pool is very susceptible to wildfires which are one of the most pervasive disturbances in the boreal biome. Identifying the dynamic trajectory and recovery pattern of postfire aboveground C (AC) storage is crucial for understanding the global ecological significance of wildfire disturbance. A total of 175 plots from eight stand age classes were surveyed in the Great Xing'an Mountains of Northeast China to quantify ecological resilience, and further examine the relationship between various components of AC and stand density throughout successional stages. Our data analysis showed that the AC pool could be a C source to the atmosphere for several decades following fire disturbances; and it would take more than a century for the AC to recover 80% of that in old-growth boreal larch forests in Northeastern China. Increases in fire frequency due to climate change and human activities will increase C emission, which may significantly influence the regional C budget. Stand density was considered as a positive factor on AC accumulation following wildfire, but this effect may be counteracted by variation in tree size due to site productivity in other successional stages.
资助项目	National Key R & D Program of China[2016YFA0600804] ; National Natural Science Foundation of China[31500387] ; National Natural Science Foundation of China[41222004] ; National Natural Science Foundation of China[41501200] ; Open Project Program of Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Guangxi Teachers Education University), Ministry of Education[GTEU-KLXTJJ-201718] ; Open Project Program of Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Guangxi Teachers Education University), Ministry of Education[GTEU-KLXTJJ-201720]
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000455437900001
资助机构	National Key R & D Program of China ; National Natural Science Foundation of China ; Open Project Program of Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Guangxi Teachers Education University), Ministry of Education
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131488]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang, Jian
作者单位	1.Guangxi Teachers Educ Univ, Guangxi Key Lab Earth Surface Proc & Intelligent, Nanning, Peoples R China 2.Univ Kentucky, Dept Forestry & Nat Resources, TP Cooper Bldg, Lexington, KY 40546 USA 3.Guangxi Teachers Educ Univ, Minist Educ, Key Lab Environm Change & Resources Use Beibu Gul, Nanning, Peoples R China 4.Chinese Acad Sci, Inst Appl Ecol, Shenyang, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yuan Z.,Cai, Wen H.,Yang, Jian,et al. Dynamics of Postfire Aboveground Carbon in a Chronosequence of Chinese Boreal Larch Forests[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2018,123(12):3490-3506.
APA	Yang, Yuan Z.,Cai, Wen H.,Yang, Jian,White, Megan,&Lhotka, John M..(2018).Dynamics of Postfire Aboveground Carbon in a Chronosequence of Chinese Boreal Larch Forests.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(12),3490-3506.
MLA	Yang, Yuan Z.,et al."Dynamics of Postfire Aboveground Carbon in a Chronosequence of Chinese Boreal Larch Forests".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.12(2018):3490-3506.