| 天山北坡典型草地净初级生产力对氮沉降及气候变化的响应阈值研究 |
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| 引用本文： | 彭开兵,韩其飞,李超凡,许文强,唐华岗,王婧,张昌银,王珂.天山北坡典型草地净初级生产力对氮沉降及气候变化的响应阈值研究[J].南京气象学院学报,2021,13(2):242-251. |
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| 作者姓名： | 彭开兵 韩其飞 李超凡 许文强 唐华岗 王婧 张昌银 王珂 |
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| 作者单位： | 南京信息工程大学 地理科学学院, 南京, 210044,南京信息工程大学 地理科学学院, 南京, 210044;南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京, 210044,南京信息工程大学 地理科学学院, 南京, 210044,中国科学院新疆生态与地理研究所, 乌鲁木齐, 830011,南京信息工程大学 地理科学学院, 南京, 210044,南京信息工程大学 地理科学学院, 南京, 210044,南京信息工程大学 地理科学学院, 南京, 210044,南京信息工程大学 地理科学学院, 南京, 210044 |
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| 基金项目： | 荒漠与绿洲生态国家重点实验室开放基金（G2018-02-05，G2019-02-03） |
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| 摘 要： | 生态阈值现象普遍存在于自然系统中.气候变化幅度过大，超出了生态系统本身的调节和修复能力，生态系统的结构功能就会遭到破坏.新疆干旱区气候波动明显，该区草地生态系统对大气氮沉降和气候变化的响应是否存在阈值，有待深入研究.本文以天山北坡沿海拔梯度分布的四种草地类型（高山草甸（AM）、中山森林草地（MMFM）、低山干草原（LMDG）和平原荒漠草原（PDG））为研究对象，基于DNDC模型，揭示氮沉降及气候变化对天山北坡草地生态系统净初级生产力的影响.研究结果表明：1）草地净初级生产力 （NPP）对氮沉降增加的响应存在阈值，PDG、LMDG、MMFM和AM的响应阈值分别为20±5.77、60±26.46、50±15.28和30±11.55 kg·hm-2.2）四种草地类型的NPP从大到小依次为MMFM、LMDG、PDG和AM，水热条件是决定NPP的主要因素.3）PDG草地NPP对温度升高的响应存在阈值，而对于其他类型的草地，在目前的研究中尚未得出确切结论.4）PDG和LMDG草地NPP与降水有明显的正相关关系，而AM草地NPP的变化与降水变化呈负相关.不同草地类型对降水变化的敏感程度也有较大差异，PDG最大，其次是LMDG，之后是AM和MMFM.
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| 关 键 词： | 氮沉降 气候变化 净初级生产力 DNDC模型 |
| 收稿时间： | 2020/5/19 0:00:00 |
Effects of nitrogen deposition and climate change on NPP of typical grasslands on the northern slopes of Tianshan Mountain |
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| PENG Kaibing,HAN Qifei,LI Chaofan,XU Wenqiang,TANG Huagang,WANG Jing,ZHANG Changyin and WANG Ke.Effects of nitrogen deposition and climate change on NPP of typical grasslands on the northern slopes of Tianshan Mountain[J].Journal of Nanjing Institute of Meteorology,2021,13(2):242-251. |
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| Authors: | PENG Kaibing HAN Qifei LI Chaofan XU Wenqiang TANG Huagang WANG Jing ZHANG Changyin and WANG Ke |
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| Affiliation: | School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044,School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044,School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044,Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011,School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044,School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044,School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044 and School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044 |
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| Abstract: | Climate change in the arid area of Xinjiang is obvious in recent years.Whether there is a threshold value for grassland ecosystem response to atmospheric nitrogen deposition and climate change in this area needs to be further studied.This paper takes the four types of grassland (alpine meadow (AM),mid-mountain forest-meadow (MMFM),low-mountain dry grassland (LMDG) and plain desert grassland (PDG)) in the northern slopes of Tianshan Mountain as research object,based on the DNDC model,to reveal the influence of atmospheric nitrogen deposition and climate change on the grassland net primary productivity (NPP).The results showed that:1) there was a threshold value of NPP response to nitrogen deposition,and the response thresholds of PDG,LMDG,MMFM,and AM were 20±5.77,60±26.46,50±15.28,and 30±11.55 kg·hm-2,respectively;2) the hydrothermal condition was the main factor determining NPP;3) there was a threshold value of NPP response to temperature rise in PDG grassland,while no definite conclusion had been drawn for the other types in the current study;4) the NPP of PDG and LMDG grassland was positively correlated with precipitation,while the change of AM grassland NPP was negatively correlated with precipitation.The sensitivity of different grassland types to precipitation changes also varied greatly,with PDG being the largest,followed by LMDG,AM,and MMFM. |
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| Keywords: | nitrogen deposition climate change net primary productivity (NPP) DNDC model |
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