Data_Sheet_1_Effects of climate change and land use/cover changes on carbon sequestration in forest ecosystems in the coastal area of China.pdf

IntroductionClimate change and land use/cover changes (LUCC) greatly influenced terrestrial carbon sequestration.
MethodsThis study evaluated the effects of climate change and LUCC on the carbon sequestration of forest ecosystems from 1991 to 2020 in the coastal area of China using a process-based global vegetation dynamic model (IBIS).
Results and discussionThe results showed that temperature had an increasing trend, with a rate of 0.02 °C yr−1; 20.00% of the forest coverage shifted spatially but there was only a 0.31% increase in total area. The carbon sequestration amounts by plants (net primary productivity, NPP) and the net carbon budget (net ecosystem productivity, NEP) in the coastal area of China in 2020 were 666.49 and 58.45 Tg C yr−1, respectively, which increased by 18.31% and 2509.30%, respectively, compared to the values in 1991. The increased forest ecosystem NPP and NEP were mainly due to climate change, while forest cover changes increased NPP by only 0.06% and NEP by 9.75% with a strong regional difference. The NPP showed a significant increasing trend, with a rate of 3.01 Tg C yr−1, which was positively correlated with temperature (0.43, p < 0.01) and precipitation (0.42, p < 0.01). However, the NEP largely varied during 1991-2020 and did not show a significant correlation with precipitation or temperature. These results provide scientific guidance for the government to enact environmental protection and low-carbon land use planning policies.

**引言** 气候变化与土地利用/覆被变化（Land Use and Cover Change，LUCC）对陆地碳固存具有显著影响。
**研究方法** 本研究采用基于过程的全球植被动态模型（IBIS），评估了1991—2020年中国沿海地区气候变化与LUCC对森林生态系统碳固存的影响。
**结果与讨论** 结果显示，研究区气温以0.02 ℃·yr⁻¹的速率呈上升趋势；20.00%的森林覆盖发生空间位移，但总森林面积仅增加0.31%。2020年中国沿海地区森林生态系统的植物固碳量（净初级生产力，Net Primary Productivity，NPP）与净碳收支（净生态系统生产力，Net Ecosystem Productivity，NEP）分别为666.49 Tg C yr⁻¹和58.45 Tg C yr⁻¹，较1991年分别增长18.31%和2509.30%。森林生态系统NPP与NEP的提升主要源于气候变化，而森林覆被变化仅使NPP提升0.06%、NEP提升9.75%，且存在显著区域差异。NPP呈显著上升趋势，增速为3.01 Tg C yr⁻¹，与气温（相关系数0.43，p < 0.01）和降水（相关系数0.42，p < 0.01）均呈显著正相关。然而，1991—2020年间NEP波动幅度较大，且与降水、气温均未呈现显著相关性。本研究结果可为政府制定环境保护与低碳土地利用规划政策提供科学指导。