武夷山国家公园垂直植被带谱变化及对气候因子的响应OA

[Objective]This research aims to analyze the interannual variation of different vegetation types along the vertical zonation of Wuyi Mountain and their response mechanisms and time-lag effects to climate fac-tors,to provide scientific basis for understanding how subtropical montane vegetation responds to climate change.[Method]The normalized difference vegetation index(NDVI)data derived from MODIS MOD13Q1 from 2001 to 2024 was collected.The missing data was reconstructed by using a Kalman filter,and the recon-struction accuracy was assessed by using R² and root mean square error(RMSE).Seasonal and trend decompo-sition using loess(STL)was then applied to obtain deseasonalized NDVI series.Combined with concurrent temperature and precipitation data,interannual growth trends of five representative vegetation types(evergreen broad-leaved forest,coniferous and broad-leaved mixed forest,coniferous forest,dwarf forest,and meadow)and their response and time-lag to climate factors were assessed.[Result]The data reconstruction using the Kal-man filter achieved high accuracy(R²>0.90).Evergreen broad-leaved forest and mixed forest showed three-phase change,shifting from an increasing to a decreasing trend in 2017 and 2019.Coniferous forest showed a per-sistent decline after 2011.Shift from an increasing to a decreasing trend was observed in dwarf forest in 2019,while shift from a decreasing to an increasing trend was observed in meadow in 2010,which exhibited the most pronounced increase.The growth conditions of all the vegetation types were significantly and positively corre-lated with annual mean temperature(P≤0.05),whereas no significant correlation with precipitation was de-tected.Temperature,therefore,emerged as the dominant climatic factor.During the growing season,time-lag effects varied among vegetation types:evergreen broad-leaved forest responded to temperature change with a 1-month lag,mixed forest and coniferous forest with a 2-month lag,whereas dwarf forest and meadow responded with no time lag to temperature but responded with a 3-month lag to precipitation.[Conclusion]Annual mean temperature is the primary climatic factor driving interannual vegetation dynamics along the vertical zonation of Wuyi Mountain,while precipitation affects vegetation mainly through time-lag effect.Vegetation types exhibit significant spatiotemporal heterogeneity in their responses to climatic factors.