关键词: 热害, 碳汇损失, 福鼎茶园, GF-7卫星, 风险评估, 精细区划

Abstract: Carrying out risk division of carbon sink losses caused by heat damage in tea plantation is of great signi-ficance for regional carbon balance and the sustainable development of tea industry. With tea plantations in Fuding City of Fujian Province as an example, we retrieved distribution information of tea plantations based on GF-7 sate-llite images, and integrated carbon sink data, temperature, elevation, and socioeconomic data to build a risk indicator system. The system covered the exposure of the disaster environment, the vulnerability of carbon sink, the risk of the disaster factor, and the disaster prevention and mitigation ability. By combining the entropy weight method, the analytic hierarchy process method and the comprehensive weighted method, we constructed a heat damage risk assessment model to achieve a refined division of carbon sink loss risk for tea plantation under heat damage. The results showed that the accuracy of tea plantation distribution information extracted from GF-7 satellite images was relatively high, with a producer’s accuracy of 76.4% and a user’s accuracy of 78.6%. The fitting degree between the remote sensing estimated tea plantation area and the records of statistical yearbook reached a significant level (R²=0.89). In the heat damage risk assessment model, the risk of the disaster factor had the maximum weight value (0.62), followed by the exposure of the disaster environment (0.21) and the vulnerability of carbon sink (0.16), while the disaster prevention and mitigation ability had the minimum weight value (0.01). Areas where the risk disaster factor reached severe level and above mainly distributed in the central, northern, southeastern and some southern parts of the study area. Those of exposure of the disaster environment were mainly located in the central, southeastern, eastern and some northern parts, and those of the vulnerability of carbon sink and extremely strong disaster prevention and mitigation ability were mainly in the central and southeastern regions. The risk area of carbon sink losses for tea plantation under heat damage could be divided into four levels, with low, moderate, high, and extremely high accounting for 18.4%, 27.0%, 29.8%, and 24.8% of the total tea plantation area, respectively. The areas with low and moderate risks were mainly distributed in the eastern coastal and high-altitude inland regions, while areas with high and extremely high risks were mostly located in low-altitude inland regions. The study could help relevant departments accurately identify the potential risks of carbon sink losses and thus provide a scientific basis for carbon sink management in tea plantations.

Key words: heat damage, carbon sink loss, the tea plantation in Fuding City, GF-7 satellite, risk assessment, refined division