2013-2020年呼伦湖流域植被碳源/汇估算及影响因子分析

doi:10.19741/j.issn.1673-4831.2021.0699

生态与农村环境学报 ›› 2022, Vol. 38 ›› Issue (11): 1437-1446.doi: 10.19741/j.issn.1673-4831.2021.0699

2013-2020年呼伦湖流域植被碳源/汇估算及影响因子分析

李朝晖^1,2, 单楠^1,2, 王琪^2,3, 李文静^1,2, 王增龙^2,3, 包萨茹^2,3, 窦华山^2,3, 敖文^2,3, 庞博^2,3, 王文林^1,2

1. 生态环境部南京环境科学研究所, 江苏南京 210042;
2. 国家环境保护呼伦湖湿地生态环境科学观测研究站, 内蒙古呼伦贝尔 021000;
3. 呼伦贝尔市北方寒冷干旱地区内陆湖泊研究院, 内蒙古呼伦贝尔 021000

收稿日期:2021-11-14 出版日期:2022-11-25 发布日期:2022-11-23
通讯作者: 单楠,E-mail:dannan333@163.com;王琪,E-mail:wangqi907291797@163.com E-mail:dannan333@163.com;wangqi907291797@163.com
作者简介:李朝晖(1995-),男,江西上饶人,硕士,主要研究方向为植被遥感、全球碳循环与气候变化。E-mail:lizhaoh2015@gmail.com
基金资助:
内蒙古自治区科技成果转化专项资金项目;呼伦湖生态安全调查评估项目;中央级公益性科研院所基本科研业务专项

Estimation of Vegetation Carbon Source/Sink and Analysis of Its Influencing Factors in Hulun Lake Basin from 2013 to 2020

LI Zhao-hui^1,2, SHAN Nan^1,2, WANG Qi^2,3, LI Wen-jing^1,2, WANG Zeng-long^2,3, BAO Sa-ru^2,3, DOU Hua-shan^2,3, AO Wen^2,3, PANG Bo^2,3, WANG Wen-lin^1,2

1. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China;
2. National Environmental Protection Hulun Lake Wetland Ecological Environment Scientific Observation and Research Station, Hulun Buir 021000, China;
3. Hulunbuir Inland Lake Research Institute of Northern Cold and Arid Areas, Hulun Buir 021000, China

Received:2021-11-14 Online:2022-11-25 Published:2022-11-23

摘要/Abstract

摘要： 陆地生态系统碳循环是气候变化和全球碳循环研究的重要组成部分。植被净生态系统生产力(NEP)是定量描述植被生态系统碳源/汇能力的重要指标。草地生态系统是全球陆地生态系统重要组成部分,呼伦湖流域是以草地生态系统为主的混合农田、森林和湿地等生态系统的多生态系统区域,其碳源/汇时空规律及其影响机制对该区域生态环境保护和修复以及区域气候变化研究具有重要意义。基于Landsat 8 OLI高分辨率卫星遥感影像以及ERA5气候再分析数据和地表覆盖分类数据,采用光能利用率模型和土壤呼吸模型估算呼伦湖流域不同植被类型碳汇时空变化规律及对气候因子的响应差异。结果表明,2013年以来,呼伦湖流域生态系统整体发挥碳汇功能,但植被固碳能力降低,58.29%的区域植被NEP呈减少趋势,36.77%的区域植被NEP呈微弱增加趋势;区域月均NEP(以C计)呈现先减少后增大的年际变化特征,变化区间为8.41~16.44 g·m^-2·月^-1;流域内草地生态系统具有最高碳汇总量(以C计),约为37 Tg·月^-1;流域内农田NEP受温度影响最大,森林NEP受温度、降水量和辐射共同影响,草地NEP主要受温度和降水量共同影响,而湿地NEP与气候因子相关不明显。

关键词: 净生态系统生产力, 碳源/碳汇, 呼伦湖流域, GEE, ERA5气候再分析数据

Abstract: The terrestrial carbon cycle is an important component for researches on climate change and global carbon cycle. Net ecosystem productivity (NEP) is an essential indicator to quantitatively describe the carbon source/sink capacity of vegetated ecosystems. The grassland ecosystem is an important part of the global terrestrial ecosystem, and the Hulun Lake Basin is a multi-ecosystem area dominated by grassland ecosystem and mixed with farmland, forest and wetland ecosystems. The spatiotemporal variations and drivers of its carbon source/sink are of great significance in the study of ecological environmental protection and restoration as well as the local climate change in this region. Based on Landsat 8 OLI high-resolution satellite remote sensing images, ERA5 climate reanalysis data and land cover data, the spatiotemporal patterns of carbon sinks of different vegetation types in the Hulun Lake basin from 2013 to 2020 and their differences in response to climate factors were estimated using a light use efficiency model and a soil respiration model. The results show that since 2013, the Hulun Lake Basin has been functioning as a carbon sink, while the carbon sequestration capacity decreased, with 58.29% of the regional vegetation NEP showing a decreasing trend and 36.77% of the regional vegetation NEP showing a weak increasing trend. The regional monthly average NEP showed inter-annual variation characteristics of firstly decreasing and then increasing, with a variation range of 8.41-16.44 g·m^-2·mo^-1, In the watershed, the grassland ecosystem had the highest total carbon sink, about 37 Tg·mo^-1, and the farmland NEP was mostly affected by temperature, and the forest ecosystem was influenced by the combination of temperature, precipitation, and radiation. The grassland ecosystem is concurrently affected by temperature and precipitation, while the wetland NEP is not significantly correlated with climate factors.

Key words: net ecosystem productivity, carbon source/sink, Hulun Lake Basin, GEE, ERA5

中图分类号:

李朝晖, 单楠, 王琪, 李文静, 王增龙, 包萨茹, 窦华山, 敖文, 庞博, 王文林. 2013-2020年呼伦湖流域植被碳源/汇估算及影响因子分析[J]. 生态与农村环境学报, 2022, 38(11): 1437-1446.

LI Zhao-hui, SHAN Nan, WANG Qi, LI Wen-jing, WANG Zeng-long, BAO Sa-ru, DOU Hua-shan, AO Wen, PANG Bo, WANG Wen-lin. Estimation of Vegetation Carbon Source/Sink and Analysis of Its Influencing Factors in Hulun Lake Basin from 2013 to 2020[J]. Journal of Ecology and Rural Environment, 2022, 38(11): 1437-1446.

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2013-2020年呼伦湖流域植被碳源/汇估算及影响因子分析

Estimation of Vegetation Carbon Source/Sink and Analysis of Its Influencing Factors in Hulun Lake Basin from 2013 to 2020

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