Late growing season carbon subsidy in native gymnosperms in a northern temperate forest

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	Late growing season carbon subsidy in native gymnosperms in a northern temperate forest
	Li, Ximeng ; Xu, Chengyuan ; Li, Zhengzhen ; Feng, Jinchao ; Tissue, David T.; Griffin, Kevin L.
刊名	TREE PHYSIOLOGY
	2019-06
卷号	39 期号:6 页码:971-982
关键词	carbon subsidy evergreen species photosynthesis respiration temperate forest
ISSN号	0829-318X
英文摘要	Evergreen tree species that maintain positive carbon balance during the late growing season may subsidize extra carbon in a mixed forest. To test this concept of 'carbon subsidy', leaf gas exchange characteristics and related leaf traits were measured for three gymnosperm evergreen species (Chamaecyparis thyoides, Tsuga canadensis and Pinus strobus) native to the oak-hickory deciduous forest in northeast USA from March (early Spring) to October (late Autumn) in a single year. All three species were photosynthetically active in Autumn. During the Summer-Autumn transition, photosynthetic capacity (A(max)) of T. canadensis and P. strobus increased (T-test, P < 0.001) and was maintained in C. thyoides (T-test, P = 0.49), while dark respiration at 20 degrees C (R-n) and its thermal sensitivity were generally unchanged for all species (one-way ANOVA, P > 0.05). In Autumn, reductions in mitochondrial respiration rate in the daylight (R-L) and the ratio of R-L to R-n (R-L/R-n) were observed in P. strobus (46.3% and 44.0% compared to Summer, respectively). Collectively, these physiological adjustments resulted in higher ratios of photosynthesis to respiration (A/R(n)and A/R-L) in Autumn for all species. Across season, photosynthetic biochemistry and respiratory variables were not correlated with prevailing growth temperature. Physiological adjustments allowed all three gymnosperm species to maintain positive carbon balance into late Autumn, suggesting that gymnosperm evergreens may benefit from Autumn warming trends relative to deciduous trees that have already lost their leaves.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42748]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Minzu Univ China, Coll Life & Environm Sci, 27 Zhongguancun South Ave, Beijing 100081, Peoples R China 2.Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA 3.Cent Queensland Univ, Sch Hlth Med & Appl Sci, Bundaberg, Qld 4670, Australia 4.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA 5.Western Sydney Univ, Hawkesbury Inst Environm, Locked Bag 1797, Penrith, NSW 2751, Australia
推荐引用方式 GB/T 7714	Li, Ximeng,Xu, Chengyuan,Li, Zhengzhen,et al. Late growing season carbon subsidy in native gymnosperms in a northern temperate forest[J]. TREE PHYSIOLOGY,2019,39(6):971-982.
APA	Li, Ximeng,Xu, Chengyuan,Li, Zhengzhen,Feng, Jinchao,Tissue, David T.,&Griffin, Kevin L..(2019).Late growing season carbon subsidy in native gymnosperms in a northern temperate forest.TREE PHYSIOLOGY,39(6),971-982.
MLA	Li, Ximeng,et al."Late growing season carbon subsidy in native gymnosperms in a northern temperate forest".TREE PHYSIOLOGY 39.6(2019):971-982.