Divergent Response of Carbon Sink to Climate Change Along Topographical Gradient in China Based on EEMD Detrending

Author:

Kong Y.12345ORCID,Zhang M.256ORCID,Gong H.13478,Jiao F.13478ORCID,Xue P.13478ORCID,Wang K.256ORCID,Liu H.13478ORCID

Affiliation:

1. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing China

2. Key Laboratory of Agro‐ecological Processes in Subtropical Region Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha China

3. School of Geography Nanjing Normal University Nanjing China

4. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province) Nanjing Normal University Nanjing China

5. Huanjiang Observation and Research Station for Karst Ecosystems Chinese Academy of Sciences Huanjiang China

6. Institutional Center for Shared Technologies and Facilities of Institute of Subtropical Agriculture CAS Changsha China

7. Jiangsu Key Laboratory of Environmental Change and Ecological Construction Nanjing Normal University Nanjing China

8. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University) Ministry of Education Nanjing China

Abstract

AbstractNet ecosystem productivity (NEP) is important in the carbon cycle. However, the divergent responses of NEP to climate change along topographical gradient, particularly slope, and aspect, is not yet well understood. This study investigates divergent response of NEP to climate change during 1981–2018 along topographical gradient by Ensemble Empirical Mode Decomposition and multiple regression. The results indicate that: (a) NEP increases at low elevations, but first decreases and then increases at mid‐high elevations, and decreases at high elevations. NEP increases with slope. NEP is higher in the east and west but lower in the north and south. (b) With elevation increasing, negative correlation of temperature (TEM) and vapor pressure deficit (VPD), along with the positive correlation of precipitation (PRE) and Solar radiation (SR) strengthens first and then weaken, but PRE's positive correlation strengthens again after 4,000 m, and TEM's negative correlation changes to positive at high elevations. Moreover, soil moisture (SM's) positive correlation strengthens overall. NEP changes are dominated by PRE and VPD below 2,000 m, by TEM and PRE at 2,000–4,000 m, and by PRE and SM above 4,000 m. (c) With slope increasing, the negative correlation of TEM and the positive correlation of SM and SR and their importance strengthen. While PRE's positive correlation and VPD's negative correlation, and their importance weaken. (d) NEP changes are controlled by PRE and VPD in all respect, but the positive relationship of PRE and its importance weakens from north to west, opposite to VPD. Our results highlight the importance of topography for deeply understanding NEP's response to climate changes.

Publisher

American Geophysical Union (AGU)

Subject

Paleontology,Atmospheric Science,Soil Science,Water Science and Technology,Ecology,Aquatic Science,Forestry

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3