| 华南受干扰林和成熟林氮素流失对模拟氮沉降的响应 |
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| 作者姓名： | FANG Yun-Ting M. YOH MO Jiang-Ming P. GUNDERSEN ZHOU Guo-Yi |
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| 作者单位： | FANG Yun-Ting,MO Jiang-Ming,ZHOU Guo-Yi(Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, the Chinese Academy of Sciences, Zhaoqing, Guangdong 520670 China);M. YOH(Tokyo University of Agriculture and Technology, Tokyo 183-8509 Japan);P. GUNDERSEN(Forest & Landscape Denmark, Faculty of Life Sciences, University of Copenhagen, Hoersholm Kongevej 11 2970 Denmark)
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| 基金项目： | 国家自然科学基金，the Knowledge Innovation Program of the Chinese Academy of Sciences |
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| 摘 要： | Current nitrogen (N) leaching losses and their responses to monthly N additions were investigated under a disturbed pine (Pinus massoniana) forest and a mature monsoon broadleaf forest in southern China. N leaching losses from both disturbed and mature forests were quite high (14.6 and 29.2 kg N ha-1 year-1, respectively), accounting for 57% and 80% of their corresponding atmospheric N inputs. N leaching losses were substantially increased following the first 1.5 years of N applications in both forests. The average increases induced by the addition of 50 and 100 kg N ha-1 year-1 were 36.5 and 24.9 kg N ha-1 year-1, respectively, in the mature forest, accounting for 73.0% and 24.9% of the annual amount of N added, and 14.2 and 16.8 kg N ha-1 year-1 in the disturbed forest, accounting for 28.4% and 16.8% of the added N. Great N leaching and a fast N leaching response to N additions in the mature forest might result from long-term N accumulation and high ambient N deposition load (greater than 30 kg N ha-1 year-1 over the past 15 years), whereas in the disturbed forest, it might result from the human disturbance and high ambient N deposition load. These results suggest that both disturbed and mature forests in the study region may be sensitive to increasing N deposition.
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| 关 键 词： | 大气氮沉积 氮增加 氮流失 氮饱和 亚热带森林 |
| 收稿时间： | 18 March 2008 |
Response of nitrogen leaching to simulated nitrogen deposition in disturbed and mature forests of southern China |
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| FANG Yun-Ting,M. YOH,MO Jiang-Ming,P. GUNDERSEN,ZHOU Guo-Yi.Response of nitrogen leaching to simulated nitrogen deposition in disturbed and mature forests of southern China[J].Pedosphere,2009,19(1):111-120. |
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| Authors: | FANG Yun-Ting M YOH MO Jiang-Ming P GUNDERSEN and ZHOU Guo-Yi |
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| Institution: | Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, the Chinese Academy of Sciences, Zhaoqing, Guangdong 520670 (China);Tokyo University of Agriculture and Technology, Tokyo 183-8509 (Japan);Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, the Chinese Academy of Sciences, Zhaoqing, Guangdong 520670 (China); Tokyo University of Agriculture and Technology, Tokyo 183-8509 (Japan);Forest & Landscape Denmark, Faculty of Life Sciences, University of Copenhagen, Hoersholm Kongevej 11 2970 (Denmark);Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, the Chinese Academy of Sciences, Zhaoqing, Guangdong 520670 (China) |
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| Abstract: | Current nitrogen (N) leaching losses and their responses to monthly N additions were investigated under a disturbed pine (Pinus massoniana) forest and a mature monsoon broadleaf forest in southern China. N leaching losses from both disturbed and mature forests were quite high (14.6 and 29.2 kg N ha-1 year-1, respectively), accounting for 57% and 80% of their corresponding atmospheric N inputs. N leaching losses were substantially increased following the first 1.5 years of N applications in both forests. The average increases induced by the addition of 50 and 100 kg N ha-1 year-1 were 36.5 and 24.9 kg N ha-1 year-1, respectively, in the mature forest, accounting for 73.0% and 24.9% of the annual amount of N added, and 14.2 and 16.8 kg N ha-1 year-1 in the disturbed forest, accounting for 28.4% and 16.8% of the added N. Great N leaching and a fast N leaching response to N additions in the mature forest might result from long-term N accumulation and high ambient N deposition load (greater than 30 kg N ha-1 year-1 over the past 15 years), whereas in the disturbed forest, it might result from the human disturbance and high ambient N deposition load. These results suggest that both disturbed and mature forests in the study region may be sensitive to increasing N deposition. |
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| Keywords: | atmospheric N deposition N addition N leaching loss N saturation subtropical forests |
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