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Long-term Nitrogen Addition Decreases Carbon Leaching in a Nitrogen-rich Forest Ecosystem : Volume 10, Issue 6 (18/06/2013)

By Lu, X.

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Book Id: WPLBN0004003065
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Long-term Nitrogen Addition Decreases Carbon Leaching in a Nitrogen-rich Forest Ecosystem : Volume 10, Issue 6 (18/06/2013)  
Author: Lu, X.
Volume: Vol. 10, Issue 6
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Yu, G., Gilliam, F. S., Li, L., Chen, H., Mo, J., Lu, X., & Mao, Q. (2013). Long-term Nitrogen Addition Decreases Carbon Leaching in a Nitrogen-rich Forest Ecosystem : Volume 10, Issue 6 (18/06/2013). Retrieved from

Description: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China. Dissolved organic carbon (DOC) plays a critical role in the carbon (C) cycle of forest soils, and has been recently connected with global increases in nitrogen (N) deposition. Most studies on effects of elevated N deposition on DOC have been carried out in N-limited temperate regions, with far fewer data available from N-rich ecosystems, especially in the context of chronically elevated N deposition. Furthermore, mechanisms for excess N-induced changes of DOC dynamics have been suggested to be different between the two kinds of ecosystems, because of the different ecosystem N status. The purpose of this study was to experimentally examine how long-term N addition affects DOC dynamics below the primary rooting zones (the upper 20 cm soils) in typically N-rich lowland tropical forests. We have a primary assumption that long-term continuous N addition minimally affects DOC concentrations and effluxes in N-rich tropical forests. Experimental N addition was administered at the following levels: 0, 50, 100 and 150 kg N ha−1 yr−1, respectively. Results showed that seven years of N addition significantly decreased DOC concentrations in soil solution, and chemo-physical controls (solution acidity change and soil sorption) rather than biological controls may mainly account for the decreases, in contrast to other forests. We further found that N addition greatly decreased annual DOC effluxes from the primary rooting zone and increased water-extractable DOC in soils. Our results suggest that long-term N deposition could increase soil C sequestration in the upper soils by decreasing DOC efflux from that layer in N-rich ecosystems, a novel mechanism for continued accumulation of soil C in old-growth forests.

Long-term nitrogen addition decreases carbon leaching in a nitrogen-rich forest ecosystem

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