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Northeast Normal University (2020)

Effects of Extreme Climate Changes on Vegetation Phenology of Inner Mongolia

红英;

Titre : Effects of Extreme Climate Changes on Vegetation Phenology of Inner Mongolia

Auteur : 红英;

Grade : Doctoral Dissertation 2020

Université : Northeast Normal University

Résumé partiel
The climate warming in the past century has had a significant impact on the frequency,intensity,spatial extend and duration of extreme climate events,which will continue to increase globally in the future.Inner Mongolia is a typical arid and semiarid climate transition zone and located in the northern of China.It has many vegetation types such as forest,forest steppe,desert steppe,typical steppe,and sand,but its ecosystem is extremely fragile.The global warming has led to the increase of extreme climate events in Inner Mongolia,which has a great impact on the vegetation dynamics.Therefore,the scientific analysis of the impact of different spatial and temporal scale extreme climate events on the vegetation phenology and the prediction of the future extreme climate events and the change characteristics of vegetation phenology have important guiding significance for promoting the protection of ecological environment and formulating effective disaster prevention and mitigation measures.This study analyzed the temporal and spatial characteristics of extreme climate events and vegetation phenology at different temporal and spatial scales,the annual and seasonal climate changes in different vegetation types and the impact of extreme climate changes on surface phenology,the extreme climate events that have the greatest impact on the surface phenology on different temporal and spatial scales have been identified,and the temporal and spatial characteristics of extreme climate events and vegetation phenology changes under different representative concentration pathways(RCP)scenarios in the future have been predicted,based on the daily meteorological data of Inner Mongolia meteorological stations,the GIMMS NDVI3 g data set,and the Phase 5 of the Coupled Model Intercomparison Project(CMIP5)future climate model,comprehensively using extreme climate indexes and surface phenological parameters(Start of Season,SOS and End of Season,EOS).The main conclusions are as follows :(1)On the years scale,the extreme climate events related to the lowest temperature and the highest temperature in Inner Mongolia have shown a decreasing and increasing trend,respectively,in the past 34 years.The increase rate of the number of warm days and warm nights was greater than the number of cold days and cold nights.On the seasonal scale,summer extreme temperature events have the largest rate,followed by spring and autumn,and winter has the smallest rate.The rate of change of desert steppe,forest,forest steppe and typical steppe I was greater

Mots clés : Inner Mongolia; extreme climate events; vegetation phenology; spatiotemporal variation; future prediction;

Présentation (CNKI)

Page publiée le 15 juin 2021