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	Long-term nitrogen addition decreases carbon leaching in a nitrogen-rich forest ecosystem
	Lu X. ; Gilliam F. S. ; Yu G. ; Li L. ; Mao Q. ; Chen H. ; Mo J.
	2013
关键词	dissolved organic-carbon old-growth forests tropical forest temperate forests inorganic nitrogen soil solution n-deposition terrestrial ecosystems litter decomposition subtropical china
英文摘要	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.
出处	Biogeosciences
卷	10
期	6
页	3931-3941
收录类别	SCI
语种	英语
ISSN号	1726-4170
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30357]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Lu X.,Gilliam F. S.,Yu G.,et al. Long-term nitrogen addition decreases carbon leaching in a nitrogen-rich forest ecosystem. 2013.

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