川滇高原高寒草甸生态系统不同功能群植物分布格局的MaxEnt模型预测OA北大核心CSTPCD

This research explored the spatial distribution patterns of different main functional groups in the alpine meadow ecosystem on the Sichuan-Yunnan Plateau.Data used were from the second scientific research program on the Qinghai-Tibetan Plateau from 2019 to 2021.The aim was to identify suitable habitats for functional groups,the main climatic factors affecting functional group distribution,and the change trends under climate change.The model MaxEnt was used to predict the special distribution pattern and the main relating climatic factors of four major species from four functional groups(Cyperaceae:Kobresia humilis;Poaceae:Elymus nutans;Mixed grass:Potentilla anserina and Fabaceae:Gueldenstaedtia diversifolia).The results showed that the areas of suitable habitats for K.humilis,E.nutans,P.anserina and G.diversifolia under the current climate conditions were 110900,92300,171200 and 165300 km2 respectively,mainly located in the central and northern regions of the Sichuan-Yunnan Plateau.The contribution rate and response curve for environmental factors showed that the habitat suitability of the four species had similarities with their ecological environment requirements.The temperature-related factors such as annual temperature range,isothermality and annual mean temperature were the main environmental factors to affect species distribution.From the future perspective,the suitable habitat of the alpine herbage species will expand under global warming,and the suitable average altitude will increase 100-200 m,but the rate of change will tend to slow down.In conclusion,the species diversity,biomass and stability of alpine meadow ecosystems is predicted to increase with climate change.