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- Title
Divergent Response of Carbon Sink to Climate Change Along Topographical Gradient in China Based on EEMD Detrending.
- Authors
Kong, Y.; Zhang, M.; Gong, H.; Jiao, F.; Xue, P.; Wang, K.; Liu, H.
- Abstract
Net 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. Plain Language Summary: This study examines how China's carbon absorption, known as net ecosystem productivity (NEP), responds to climate change along topographical gradient by combining Ensemble Empirical Mode Decomposition detrending and multiple regression. We found that NEP changes along both elevation and slope gradients. Factors like temperature (TEM), precipitation (PRE), radiation, soil moisture (SM), and vapor pressure affect NEP differently across these gradients. Below 2,000 m, PRE and vapor pressure deficit play a crucial role in NEP, while between 2000 and 4,000 m, TEM and PRE become more influential. Above 4,000 m, PRE and SM are the main drivers. The slope gradient also influences NEP differently, with PRE and TEM being key factors. Additionally, changes of NEP in each aspect are mainly controlled by PRE and VPD. These findings highlight the complex relationship between climate and NEP, emphasizing the need to consider topography when studying carbon dynamics in ecosystems. Understanding these patterns can help inform climate change mitigation and land management strategies. Key Points: Based on Ensemble Empirical Mode Decomposition‐detrending, Net ecosystem productivity (NEP)'s response to each variable varies and has different spatial distribution patternThere are significantly divergent responses of NEP to each variable along elevation, slope and aspect gradientAlong elevation, slope, and aspect gradient, NEP changes were dominated by different variables
- Subjects
CARBON cycle; HILBERT-Huang transform; CLIMATE change mitigation; VAPOR pressure; ECOSYSTEM dynamics; CLIMATE change; LANDSLIDE hazard analysis
- Publication
Journal of Geophysical Research. Biogeosciences, 2023, Vol 128, Issue 11, p1
- ISSN
2169-8953
- Publication type
Article
- DOI
10.1029/2023JG007641