| 我国自然生态系统氮沉降临界负荷评估 |
| 摘要点击 1583 全文点击 405 投稿时间：2022-06-21 修订日期：2022-08-30 |
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| 中文关键词 氮沉降 临界负荷 超临界负荷 盐基阳离子沉降量 稳态质量平衡法 |
| 英文关键词 nitrogen deposition critical load exceedances of critical load base cations deposition steady-state mass balance method |
| 作者 | 单位 | E-mail | | 黄静文 | 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | huangjingwen@issas.ac.cn | | 刘磊 | 兰州大学资源环境学院, 兰州 730000 | | | 颜晓元 | 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | | | 遆超普 | 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | cpti@issas.ac.cn |
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| 中文摘要 |
| 过量的氮沉降引起了一系列环境问题并导致生物多样性损失,因此评估当前生态系统氮沉降临界负荷对区域氮管理及其污染控制至关重要.利用稳态质量平衡法估算了当前我国自然生态系统的氮沉降临界负荷,并与氮沉降数据对比,获取了我国超过氮沉降临界负荷的生态系统空间分布情况.结果表明,6%的地区氮沉降临界负荷大于56 kg·(hm2·a)-1,67%的地区氮沉降临界负荷在14~56 kg·(hm2·a)-1之间,27%的地区氮沉降临界负荷小于14 kg·(hm2·a)-1.氮沉降临界负荷较高的区域主要分布在青藏高原东部、内蒙古东北部和南部部分地区.氮沉降临界负荷较低的区域主要分布在青藏高原西部、西北地区和东南部分地区.氮沉降超过临界负荷的区域约占我国的21%,主要分布在东南和东北部分地区.东北、西北和青藏高原地区超临界负荷值普遍低于14 kg·(hm2·a)-1.因此,未来这些超过氮沉降临界负荷地区的氮素管理和控制更为值得关注. |
| 英文摘要 |
| Excessive nitrogen (N) deposition causes a series of environmental problems, including biodiversity loss. Therefore, assessing current N deposition thresholds of natural ecosystems is critical for regional N management and pollution control. In this study, the critical loads of N deposition in mainland China were estimated using the steady-state mass balance method, and the spatial distribution of ecosystems that exceeded the critical load was evaluated. The results showed that areas with critical loads of N deposition higher than 56, in the range of 14-56, and lower than 14 kg·(hm2·a)-1 accounted for 6%, 67%, and 27% of that in China, respectively. The areas with higher critical loads of N deposition were mainly distributed in the eastern Tibetan Plateau, northeastern Inner Mongolia, and parts of south China. Lower critical loads of N deposition were mainly distributed in the western Tibetan Plateau, northwest China, and parts of southeast China. Moreover, the areas where N deposition exceeded the critical loads accounted for 21% of that in mainland China, being mainly distributed in southeast and northeast China. The exceedances of critical loads of N deposition in northeast China, northwest China, and the Qinghai-Tibet Plateau were generally lower than 14 kg·(hm2·a)-1. Therefore, the management and control of N in these areas that exceeded the critical load of deposition is more worthy of future attention. |
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