文献类型：期刊文献

英文题名：Carbon exchange in a tropical montane rainforest: Annual budgets, drivers, and anomalies

作者：Liu, Peirong[1] Zhou, Zhang[1] Wu, Guilin[1] Tong, Xiaojuan[2] Zhang, Tao[1] Zhang, Jingru[3] Wang, Fangyuan[4] Chen, Dexiang[1]

第一作者：Liu, Peirong

通信作者：Chen, DX[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Hainan Jianfengling Forest Ecosyst Natl Field Sci, Guangzhou 510520, Peoples R China;[2]Beijing Forestry Univ, Sch Ecol & Nat Conservat, Beijing 311300, Peoples R China;[3]Zhejiang A&F Univ, Sch Environm & Resources Sci Conservat, Hangzhou 311300, Peoples R China;[4]Fujian Agr & Forestry Univ, Coll Forestry, Fuzhou 350002, Peoples R China

年份：2026

卷号：379

外文期刊名：AGRICULTURAL AND FOREST METEOROLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001684667700001)】；

基金：This study was sponsored by the National Natural Science Foundation of China (32401358, 32271875) , the Hainan Provincial Natural Science Foundation of China (423CXTD389) , and the Jianfengling

语种：英文

外文关键词：Carbon fluxes; Tropical rainforest; Climate change; Typhoon; Drought

摘要：Tropical forests store substantial carbon stocks and play important roles in biogeochemical carbon cycling. Understanding the drivers of carbon fluxes in tropical forests and how they respond to extreme events are crucial for predicting future global carbon dynamics. Utilizing a 12-year CO2 flux dataset and meteorological variables from a tropical montane rainforest ecosystem in southern China. This study assessed the effects of climatic drivers on the seasonal and interannual variations in gross primary productivity (GPP), ecosystem respiration (ER), and net ecosystem productivity (NEP), as well as the responses of carbon fluxes to extreme climate events. The ecosystem functioned as a strong carbon sink (NEP = 368 +/- 121 g C m(-2)) across the study period. Both GPP and ER were generally higher in the wet season. Compared to the dry season, NEP values decreased by 18% during the wet season, primarily due to a temperature-induced increase in ER surpassing GPP. Annual GPP, ER, and NEP showed increasing trends of 32.32 g C m(-2) year(-1) (P < 0.1), 24.4 g C m(-2) year(-1) (P > 0.1), and 12.78 g C m(-2) year(-1) (P > 0.1), respectively. For seasonal fluxes, GPP was mainly controlled by solar-induced chlorophyll fluorescence (SIF), air temperature (T-a), and solar radiation (R-s); ER was predominantly influenced by the SIF and T-a; and NEP was primarily driven by T-a and R-s. On the interannual scale, T-a was the most important factor affecting GPP, ER, and NEP, followed by SIF, precipitation (PPT), and R-s. Extreme climate events, such as typhoons, significantly reduced GPP and NEP via physical pathways, while having a minimal effect on ER. Droughts notably enhanced GPP and ER (P < 0.05). In contrast, a severe drought in 2006 led to reductions in GPP, ER, and NEP of 11%, 12%, and 8%, respectively. Overall, this study addresses the lack of long-term research on CO2 fluxes in the tropical rainforest of China and will improve the understanding and prediction of the forest carbon dynamics.