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Northwest A&F University (2021)

Effects of Meteorological and Agricultural Drought on Winter Wheat Growth and Yield

陈新国

Titre : Effects of Meteorological and Agricultural Drought on Winter Wheat Growth and Yield

Auteur : 陈新国

Grade : Doctoral Dissertation 2021

Université : Northwest A&F University

Résumé partiel
Drought is one of the main natural disasters affecting crop growth process and yield.In order to deal with drought disaster in crop growth period scientifically and reasonably and reduce the influence of drought on winter wheat growth and yield,it is of great si gnificance to explore the influence of different types of drought on winter wheat growth process and yield.On the basis of collecting meteorology,soil,crop,geography and other data,this study analyzed the temporal and spatial evolution and drought characteristics in different regions of China in 1961-2100 based on 12-month SPEI.Further study about meteorological drought and agricultural drought from 1-to 9-month timescale in winter wheat growth period was did.DSSAT-CERES-Wheat model was used to simulate the winter wheat growth period,biomass in winter wheat maturity,the maximum leaf area index and winter wheat yield of 108 agrometeorological stations in China under SSP1-2.6,SSP2-4.5,SSP3-7.0 and SSP5-8.5 scenarios.At last,the relationships between biomass in winter wheat maturity/the maximum leaf area index/winter wheat yield and SPEI/SMDI at different timescales were analyzed to explore the effects of meteorological drought and agricultural drought on winter growth and yield.The main conclusions are as follows :(1)The spatiotemporal evolution and drought characteristics under different drought levels in different subregions of China in historical and future periods were analyzed comprehensively.Compared with the historical period,the drought tendency in the northwest desert region of China would increase in the 21st century,while wet tendency would occur in the other regions.With the increase of emission scenarios,the humidification trend in the Qinghai-tibet region,the northeast temperature region and the north China warm temperate region would increase gradually.Compared with 1961-2000,the frequency,duration and intensity of extreme drought in the northwest desert region of China and the Qinghai-tibet plateau region would increase over 2021-2060 and 2061-2100,while the mild,moderate and severe drought duration and severity over 2021-2060 and 2061-2100 gradually decreased.The drought frequency in the humid and semi-humid region of north China is lower than that in the other regions.The drought frequency over future under SSP1-2.6scenario is higher than the other three scenarios.The extreme drought duration and intensity under SSP5-8.5 scenario is greater than the other three scenarios.(2)The spatiotemporal evolution characteristics of multi-timescale drought in winter wheat growth period in winter wheat planting area in China were systematically expounded.The meteorological drought of winter wheat growth period in Huang-Huai-Hai Plain over 1981-2015 was more frequency than that in Xinjiang.

Mots clés : Meteorological drought ;Agricultural drought ;Spatiotemporal variations ;DSSAT-CERES-Wheat model ;Winter wheat ;

Présentation (CNKI)

Page publiée le 15 novembre 2021