Long-term nitrogen addition decreases carbon leaching in a nitrogen-rich forest ecosystem
文献类型：SCI/SSCI论文
| 作者 | Lu X. ; Gilliam F. S. ; Yu G. ; Li L. ; Mao Q. ; Chen H. ; Mo J. |
| 发表日期 | 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 |
| 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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