| 长期氮添加对草甸草原生态系统氮库的影响 |
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| 引用本文： | 耿倩倩,王银柳,牛国祥,王楠楠,哈斯木其尔,李昂,黄建辉. 长期氮添加对草甸草原生态系统氮库的影响[J]. 应用生态学报, 2021, 32(8): 2783-2790. DOI: 10.13287/j.1001-9332.202108.005 |
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| 作者姓名： | 耿倩倩 王银柳 牛国祥 王楠楠 哈斯木其尔 李昂 黄建辉 |
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| 作者单位： | 1.中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093;2.中国科学院大学, 北京 100049;3.中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室, 长春 130102 |
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| 基金项目： | 国家自然科学基金项目(32071562)资助 |
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| 摘 要： | 大气氮沉降增加深刻影响生态系统物种多样性、生产力及其稳定性,研究草原生态系统N库如何响应不断增加的大气氮沉降至关重要.本研究在内蒙古额尔古纳草甸草原开展刈割和不同水平外源氮添加试验,设置6个氮添加水平:0、2、5、10、20和50 g·m-2·a-1,同时设置刈割处理,分为刈割和不刈割2个水平.在连续处理的第7年,采集...
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| 关 键 词： | 氮添加 刈割 氮含量 氮库 草甸草原 氮饱和 |
| 收稿时间： | 2021-02-12 |
Effects of long-term nitrogen addition on the nitrogen pools in a meadow steppe ecosystem |
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| GENG Qian-qian,WANG Yin-liu,NIU Guo-xiang,WANG Nan-nan,HASI Muqier,LI Ang,HUANG Jian-hui. Effects of long-term nitrogen addition on the nitrogen pools in a meadow steppe ecosystem[J]. The journal of applied ecology, 2021, 32(8): 2783-2790. DOI: 10.13287/j.1001-9332.202108.005 |
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| Authors: | GENG Qian-qian WANG Yin-liu NIU Guo-xiang WANG Nan-nan HASI Muqier LI Ang HUANG Jian-hui |
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| Affiliation: | 1.State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China |
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| Abstract: | Increasing atmospheric nitrogen (N) deposition greatly affects species diversity, productivity, and stability of ecosystems. It is thus of the great importance to understand how grassland N pools respond to the increased atmospheric N deposition. This study was conducted in a meadow steppe in Erguna, Inner Mongolia, China. There were six levels of N addition (i.e., 0, 2, 5, 10, 20 and 50 g·m-2·a-1) and two levels of mowing (i.e., mowing and unmown). Samples of aboveground tissues of dominant plant, root, aboveground litter, and soil to the depth of 100 cm were collected in the seventh year after treatments. The N content was measured and the N pool was calculated. The results showed that N addition significantly increased the N content of aboveground plant tissues and litter, as well as N pools of Leymus chinensis, plant community, litter and ecosystem. Mowing significantly increased the N content of L. chinensis leaf and litter, but reduced N pools of L. chinensis, plant community and litter, and did not affect their responses to N addition. There was a significant interactive effect between mowing and N addition on plant community N pool. High levels of N addition in the unmown treatment led to more N stored in the litter pool, with the saturation threshold for the plant community N pool occurred at 10 g·m-2·a-1. Under mowing treatment, the plant community N pool increased with the increasing N addition, and more N stored in plant community N pool after mowing. Mowing could alleviate the negative impacts of increasing N deposition on biodiversity and ecosystem stability, and extended postponing the occurrence of ecosystem N saturation induced by increasing N deposition. |
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| Keywords: | nitrogen addition mowing N content N pool meadow steppe nitrogen saturation |
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