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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

Using the model MaxEnt to predict plant distribution patterns of different functional groups in the alpine meadow ecosystem on Sichuan-Yunnan Plateau

中文摘要英文摘要

为探究青藏高原高寒草甸生态系统不同主要功能群适宜生境的空间分布格局、主控气候因子及在气候变化背景下的变化趋势,基于青藏高原第2次科考数据(2019-2021年),利用MaxEnt模型预测川滇高原高寒草甸生态系统主要功能群的4种典型物种(莎草科-矮嵩草;禾本科-垂穗披碱草;杂类草-鹅绒委陵菜;豆科-异叶米口袋)在未来气候变化条件下空间分布格局及影响其分布的主要气候因子.结果表明,矮嵩草、垂穗披碱草、鹅绒委陵菜和异叶米口袋在当前气候条件下的适宜生境面积分别为11.09万、9.23万、17.12万和16.53万km2,主要位于川滇高原中部和北部区域.环境因子贡献率和响应曲线显示,4个物种生境适宜性对生存环境具有相似的生态要求,且影响其分布的主要气候因子均为气温年较差、等温性和年均温等与温度有关的环境因子.在未来气候背景下,4个物种适宜生境面积均呈扩张趋势且平均海拔均升高了100~200 m,但变化速率趋于减缓,高寒草甸生态系统的物种多样性、生物量和稳定性可能随着气候变化而增强.

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.

油志远;马淑娟;王长庭;丁路明;宋小艳;尹高飞;毛军

西南民族大学青藏高原研究院,四川 成都 610225西南交通大学地球科学与环境工程学院,四川 成都 610031

川滇高原高寒草甸功能群气候变化生境适宜性

Sichuan-Yunnan Plateaualpine meadowfunction groupclimate changehabitat suitability

《草业学报》 2024 (003)

气候变化下川西北高寒草甸生态系统多功能性维持的地下生态学过程与机制

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国家自然科学基金项目(U20A2008),第二次青藏高原综合科学考察研究项目(2019QZKK0302-02),中央高校基本科研业务费专项经费项目(ZYN2023083)和西南民族大学研究生"创新型科研项目"重点项目(ZD2022510)资助.

10.11686/cyxb2023146

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