| Emissions of nitrous oxide from three tropical forests in Southern China in response to simulated nitrogen deposition | |
| Zhang W. ; Mo J. M. ; Yu G. R. ; Fang Y. T. ; Li D. J. ; Lu X. K. ; Wang H. | |
| 2008 | |
| 关键词 | anthropogenic disturbances. N(2)O emission N deposition tropical forests China impacted pine forest trace gas fluxes soil n dynamics land-use subtropical china nutrient dynamics litter decomposition organic-matter co2 emissions n2o emissions |
| 英文摘要 | Emissions of nitrous oxide (N(2)O) from the soil following simulated nitrogen (N) deposition in a disturbed (pine), a rehabilitated (pine and broadleaf mixed) and a mature (monsoon evergreen broadleaf) tropical forest in southern China were studied. The following hypotheses were tested: (1) addition of N will increase soil N(2)O emission in tropical forests; and (2) any observed increase will be more pronounced in the mature forest than in the disturbed or rehabilitated forest due to the relatively high initial soil N concentration in the mature forest. The experiment was designed with four N treatment levels (three replicates; 0, 50, 100, 150 kg N ha(-1) year(-1) for C (Control), LN (Low-N), MN (Medium-N), and HN (High-N) treatment, respectively) in the mature forest, but only three levels in the disturbed and rehabilitated forests (C, LN and MN). Between October 2005 to September 2006, soil N(2)O flux was measured using static chamber and gas chromatography methodology. Nitrogen had been applied previously to the plots since July 2003 and continued during soil N(2)O flux measurement period. The annual mean rates of soil N(2)O emission in the C plots were 24.1 +/- 1.5, 26.2 +/- 1.4, and 29.3 +/- 1.6 mu g N(2)O-N m(-2) h(-1) in the disturbed, rehabilitated and mature forest, respectively. There was a significant increase in soil N(2)O emission following N additions in the mature forest (38%, 41%, and 58% when compared to the C plots for the LN, MN, and HN plots, respectively). In the disturbed forest a significant increase (35%) was observed in the MN plots, but not in the LN plots. The rehabilitated forest showed no significant response to N additions. Increases in soil N(2)O emission occurred primarily in the cool-dry season (November, December and January). Our results suggest that the response of soil N(2)O emission to N deposition in tropical forests in southern China may vary depending on the soil N status and land-use history of the forest. |
| 出处 | Plant and Soil |
| 卷 | 306 |
| 期 | 1-2 |
| 页 | 221-236 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0032-079X |
| 内容类型 | SCI/SSCI论文 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22361]  |
| 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 | Zhang W.,Mo J. M.,Yu G. R.,et al. Emissions of nitrous oxide from three tropical forests in Southern China in response to simulated nitrogen deposition. 2008. |
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