气候变化领域集成服务门户(CCPortal): 13-year nitrogen addition increases nonstructural carbon pools in subtropical forest trees in southern China

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DOI	10.1016/j.foreco.2020.118748
	13-year nitrogen addition increases nonstructural carbon pools in subtropical forest trees in southern China
	Huang J.; Wang X.; Zheng M.; Mo J.
发表日期	2020
ISSN	0378-1127
英文摘要	Nonstructural carbohydrates (NSC) are important for plant growth and defense, and represent an important carbon pool that contributes to carbon (C) cycling and balance, but we know little about the variation of NSC in trees under global change scenarios, particularly nitrogen (N) deposition. Here, we investigated the responses of NSC (sugar and starch) pools of two dominant tree species (Castanopsis chinensis (broadleaf) and Pinus massoniana (coniferous)) to 13-year N treatments in different seasons in southern Chinese forests. Nitrogen addition increased NSC pools of the two tree species at the whole-tree and organ levels. We observed the larger starch pool (only in the wet season) and the highest increased NSC in the branches (3.8-fold) of C. chinensis following N addition. We also found the larger sugar pools (both in the dry and wet season) and the highest increased NSC in the roots (2.2-fold) of P. massoniana after N addition. Despite the increases in NSC of trees, we found no changes in chloroplast and photosynthetic capacity in response to N addition; however, the increased NSC may support prime defense of trees, as evidenced by significant correlations between NSC pools with volatile organic compounds (VOCs) emission (P < 0.05, R2 in the range of 0.5–0.8). Our findings indicate that long-term N deposition induced carbon distribution and adaptation strategies of different subtropical trees, with increased NSC storage at the whole-tree and organ levels and more NSC being allocated to the branches of broadleaf tree species and to the roots of coniferous tree species, respectively. This study provides a new insight into understanding the mechanisms of subtropical forest trees adapting and surviving under long-term N deposition, and is also important for exploring the ecosystem C-N coupling relationships under global environment changes. © 2020 Elsevier B.V.
英文关键词	Broadleaf trees; Carbon allocation; Coniferous trees; Nitrogen deposition; Nonstructural carbohydrates (NSC)
语种	英语
scopus关键词	Carbon; Deposition; Lakes; Network security; Nitrogen; Starch; Tropics; Volatile organic compounds; Adaptation strategies; Carbon distribution; Dry and wet seasons; Global environment; Nitrogen additions; Non-structural carbohydrates; Photosynthetic capacity; Subtropical forests; Forestry
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155655
作者单位	Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou, 510650, China; Center for Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, 510650, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Kehua Road 511, Tianhe District, Guangzhou, 510640, China
推荐引用方式 GB/T 7714	Huang J.,Wang X.,Zheng M.,et al. 13-year nitrogen addition increases nonstructural carbon pools in subtropical forest trees in southern China[J],2020.
APA	Huang J.,Wang X.,Zheng M.,&Mo J..(2020).13-year nitrogen addition increases nonstructural carbon pools in subtropical forest trees in southern China.Forest Ecology and Management.
MLA	Huang J.,et al."13-year nitrogen addition increases nonstructural carbon pools in subtropical forest trees in southern China".Forest Ecology and Management (2020).