globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13327
论文题名:
High retention of 15N-labeled nitrogen deposition in a nitrogen saturated old-growth tropical forest
作者: Gurmesa G.A.; Lu X.; Gundersen P.; Mao Q.; Zhou K.; Fang Y.; Mo J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:11
起始页码: 3608
结束页码: 3620
语种: 英语
英文关键词: 15N tracer ; fate of deposited N ; N saturation ; nitrogen addition ; tropical forest
Scopus关键词: deposition ; leaching ; nitrogen ; retention ; tracer ; tropical forest ; nitrogen ; soil ; China ; ecosystem ; forest ; soil ; China ; Ecosystem ; Forests ; Nitrogen ; Soil
英文摘要: The effects of increased reactive nitrogen (N) deposition in forests depend largely on its fate in the ecosystems. However, our knowledge on the fates of deposited N in tropical forest ecosystems and its retention mechanisms is limited. Here, we report the results from the first whole ecosystem 15N labeling experiment performed in a N-rich old-growth tropical forest in southern China. We added 15N tracer monthly as 15NH4 15NO3 for 1 year to control plots and to N-fertilized plots (N-plots, receiving additions of 50 kg N ha−1 yr−1 for 10 years). Tracer recoveries in major ecosystem compartments were quantified 4 months after the last addition. Tracer recoveries in soil solution were monitored monthly to quantify leaching losses. Total tracer recovery in plant and soil (N retention) in the control plots was 72% and similar to those observed in temperate forests. The retention decreased to 52% in the N-plots. Soil was the dominant sink, retaining 37% and 28% of the labeled N input in the control and N-plots, respectively. Leaching below 20 cm was 50 kg N ha−1 yr−1 in the control plots and was close to the N input (51 kg N ha−1 yr−1), indicating N saturation of the top soil. Nitrogen addition increased N leaching to 73 kg N ha−1 yr−1. However, of these only 7 and 23 kg N ha−1 yr−1 in the control and N-plots, respectively, originated from the labeled N input. Our findings indicate that deposited N, like in temperate forests, is largely incorporated into plant and soil pools in the short term, although the forest is N-saturated, but high cycling rates may later release the N for leaching and/or gaseous loss. Thus, N cycling rates rather than short-term N retention represent the main difference between temperate forests and the studied tropical forest. © 2016 John Wiley & Sons Ltd
资助项目: This study was initiated under the Sino-Danish Centre for Education and Research (SDC). It was supported by National Natural Science Foundation of China (No. 41473112 ; 31370498), the National Basic Research Program of China (2014CB954400) and the SDC. We would like to thank the State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, and the Chinese Academy of Sciences (No. LFSE 2013-13) for analyzing the water samples. We are grateful to the support we got from the K.C. Wong Education Foundation, Hong Kong. We also wish to thank Lijie Deng, Cong Wang and Xiaoping Pan for their skillful assistance in field and laboratory work. The authors declare no conflict of interest with the organization that sponsored the research.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61259
Appears in Collections:影响、适应和脆弱性

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作者单位: Vegetation Restoration and Management of Degraded Ecosystems and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China; Department of Geosciences and Natural Resource Management, University of Copenhagen, 1958 Frederiksberg C, Denmark; Sino-Danish Center for Education and Research, DK-8000, Aarhus C, Denmark; University of Chinese Academy of Sciences, Beijing, China; Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China; Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang, China

Recommended Citation:
Gurmesa G.A.,Lu X.,Gundersen P.,et al. High retention of 15N-labeled nitrogen deposition in a nitrogen saturated old-growth tropical forest[J]. Global Change Biology,2016-01-01,22(11)
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