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DOI	10.1007/s10533-020-00750-y
	Retention and partitioning of 15N-labeled deposited N in a tropical plantation forest
	Gurmesa G.A.; Mo J.; Gundersen P.; Mao Q.; Fang Y.; Zhu F.; Lu X.
发表日期	2021
ISSN	1682563
起始页码	237
结束页码	251
卷号	152 期号:2021-02-03
英文摘要	The effects of deposited nitrogen (N) on forest ecosystems largely depend on the amount of N retained in the ecosystems and its partitioning among ecosystem pools. However, our understanding of the capacity of tropical plantations to retain deposited N is limited. To evaluate the retention of deposited N in a human-disturbed pine plantation in southern China and compare the result with previous findings in an adjacent old-growth forest, we added 15N-tracer monthly to the forest floor for one year and determined its recovery in ecosystem compartments four months after the last addition. We monitored 15N recoveries in soil solution monthly to quantify leaching losses. The pine forest retained about 58 ± 5% of the 15N-labeled deposited N, which is lower than that reported in the adjacent old-growth forest (72 ± 6%). Both forests experience chronic N deposition (recently measured at 51 kg N ha−1 yr−1) and we attribute the difference in retention to effects of previous disturbance mainly understory and litter harvesting in the pine plantation. Only 3 kg N ha−1 yr−1 (5% of the 15N-labeled deposited N) out of the measured total leaching (54 kg N ha−1 yr−1) originated from deposited (and labeled) N from the measurement year, suggesting that N leaching is dominated by unlabeled N sources. Furthermore, results from our study and other similar 15N labeling experiments together show similar patterns of total ecosystem retention of deposited N in tropical and temperate forests, but here we demonstrate a decreasing retention of N with increased N deposition in these forests. Our findings indicate that plantation forests that experience human-disturbance and chronic N deposition have lower N retention compared to old-growth forests, and thus elevated N inputs in such ecosystems can cause risk of hydrological N losses, soil acidification, and freshwater pollution. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.
英文关键词	China; Nitrogen deposition; Nitrogen saturation; Stable nitrogen isotope; Tracer study; Tropical forest
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184624
作者单位	Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden; and Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, 510650, China; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, 1958 Frederiksberg C, Denmark; Sino-Danish Center for Education and Research, Aarhus, 8000 Aarhus C, Denmark; CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; Key Laboratory of Stable Isotope Techniques and Applications, Shenyang, 110016, China
推荐引用方式 GB/T 7714	Gurmesa G.A.,Mo J.,Gundersen P.,et al. Retention and partitioning of 15N-labeled deposited N in a tropical plantation forest[J],2021,152(2021-02-03).
APA	Gurmesa G.A..,Mo J..,Gundersen P..,Mao Q..,Fang Y..,...&Lu X..(2021).Retention and partitioning of 15N-labeled deposited N in a tropical plantation forest.Biogeochemistry,152(2021-02-03).
MLA	Gurmesa G.A.,et al."Retention and partitioning of 15N-labeled deposited N in a tropical plantation forest".Biogeochemistry 152.2021-02-03(2021).