Yanyu Lu, Yao Huang, Qianlai Zhuang, Wei Sun, Shutao Chen, Jun Lu
{"title":"China’s terrestrial ecosystem carbon balance during the 20th century: an analysis with a process-based biogeochemistry model","authors":"Yanyu Lu, Yao Huang, Qianlai Zhuang, Wei Sun, Shutao Chen, Jun Lu","doi":"10.1186/s13021-022-00215-9","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>China’s terrestrial ecosystems play a pronounced role in the global carbon cycle. Here we combine spatially-explicit information on vegetation, soil, topography, climate and land use change with a process-based biogeochemistry model to quantify the responses of terrestrial carbon cycle in China during the 20th century.</p><h3>Results</h3><p>At a century scale, China’s terrestrial ecosystems have acted as a carbon sink averaging at 96 Tg C yr<sup>− 1</sup>, with large inter-annual and decadal variabilities. The regional sink has been enhanced due to the rising temperature and CO<sub>2</sub> concentration, with a slight increase trend in carbon sink strength along with the enhanced net primary production in the century. The areas characterized by C source are simulated to extend in the west and north of the Hu Huanyong line, while the eastern and southern regions increase their area and intensity of C sink, particularly in the late 20th century. Forest ecosystems dominate the C sink in China and are responsible for about 64% of the total sink. On the century scale, the increase in carbon sinks in China’s terrestrial ecosystems is mainly contributed by rising CO<sub>2</sub>. Afforestation and reforestation promote an increase in terrestrial carbon uptake in China from 1950s. Although climate change has generally contributed to the increase of carbon sinks in terrestrial ecosystems in China, the positive effect of climate change has been diminishing in the last decades of the 20th century.</p><h3>Conclusion</h3><p>This study focuses on the impacts of climate, CO<sub>2</sub> and land use change on the carbon cycle, and presents the potential trends of terrestrial ecosystem carbon balance in China at a century scale. While a slight increase in carbon sink strength benefits from the enhanced vegetation carbon uptake in China’s terrestrial ecosystems during the 20th century, the increase trend may diminish or even change to a decrease trend under future climate change.</p></div>","PeriodicalId":505,"journal":{"name":"Carbon Balance and Management","volume":"17 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9548143/pdf/","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Balance and Management","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1186/s13021-022-00215-9","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 3
Abstract
Background
China’s terrestrial ecosystems play a pronounced role in the global carbon cycle. Here we combine spatially-explicit information on vegetation, soil, topography, climate and land use change with a process-based biogeochemistry model to quantify the responses of terrestrial carbon cycle in China during the 20th century.
Results
At a century scale, China’s terrestrial ecosystems have acted as a carbon sink averaging at 96 Tg C yr− 1, with large inter-annual and decadal variabilities. The regional sink has been enhanced due to the rising temperature and CO2 concentration, with a slight increase trend in carbon sink strength along with the enhanced net primary production in the century. The areas characterized by C source are simulated to extend in the west and north of the Hu Huanyong line, while the eastern and southern regions increase their area and intensity of C sink, particularly in the late 20th century. Forest ecosystems dominate the C sink in China and are responsible for about 64% of the total sink. On the century scale, the increase in carbon sinks in China’s terrestrial ecosystems is mainly contributed by rising CO2. Afforestation and reforestation promote an increase in terrestrial carbon uptake in China from 1950s. Although climate change has generally contributed to the increase of carbon sinks in terrestrial ecosystems in China, the positive effect of climate change has been diminishing in the last decades of the 20th century.
Conclusion
This study focuses on the impacts of climate, CO2 and land use change on the carbon cycle, and presents the potential trends of terrestrial ecosystem carbon balance in China at a century scale. While a slight increase in carbon sink strength benefits from the enhanced vegetation carbon uptake in China’s terrestrial ecosystems during the 20th century, the increase trend may diminish or even change to a decrease trend under future climate change.
中国陆地生态系统在全球碳循环中扮演着重要角色。本文将植被、土壤、地形、气候和土地利用变化的空间信息与基于过程的生物地球化学模型相结合，量化了20世纪中国陆地碳循环的响应。结果在一个世纪尺度上，中国陆地生态系统的平均碳汇为96 Tg C /年，具有较大的年际和年代际变化。由于温度和CO2浓度的升高，区域碳汇强度有所增强，在本世纪内碳汇强度随净初级产量的增加略有增加。在胡焕永线的西部和北部，以C源为特征的区域有所扩展，而东部和南部地区的C汇面积和强度增加，特别是在20世纪后期。森林生态系统在中国碳汇中占主导地位，约占总碳汇的64%。在世纪尺度上，中国陆地生态系统碳汇的增加主要是由于CO2的增加。20世纪50年代以来，造林和再造林促进了中国陆地碳吸收的增加。尽管气候变化总体上促进了中国陆地生态系统碳汇的增加，但在20世纪最后几十年，气候变化的积极影响正在减弱。结论研究了气候、CO2和土地利用变化对中国陆地生态系统碳循环的影响，揭示了百年尺度下中国陆地生态系统碳平衡的潜在趋势。虽然20世纪中国陆地生态系统碳汇强度的小幅增加得益于植被碳吸收的增强，但在未来气候变化的影响下，碳汇强度的增加趋势可能会减弱甚至变为减少趋势。
期刊介绍：
Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle.
The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community.
This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system.
Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
