Variation Characteristics of Light Suitability of Maize in the Upper Reaches of Weihe River Basin from 1971 to 2020

doi:10.11924/j.issn.1000-6850.casb2022-0382

Abstract

Abstract:

Based on the ten-day light data of meteorological stations from 1971 to 2020 and average phenological data of maize from 1991 to 2020 in the typical areas of the upper reaches of Weihe River basin in Gansu, the model of light suitability for maize was established. The light suitability of the whole growth period and main growth stages of maize from 1971 to 2020 was analyzed and compared with the change from 1991 to 2020 under the background of climate warming. The results showed that the light suitability during the whole growth period of maize showed a downward trend from 1971 to 2020, and the downward trend was significant from 2008 to 2020. The light suitability was the worst from jointing stage to tasseling stage and decreased significantly from 1991 to 2020, while it was the best and basically unchanged with years from tasseling stage to milky ripeness stage. The correlation between maize climatic yield and the light suitability from jointing stage to tasseling stage and during the whole growth period from 1991 to 2020 was significantly higher than that from 1971 to 2008, indicating that the effect of insufficient light in critical stages on maize yield significantly increased under the background of climate warming. According to the outputs of FGOALS-f3-H for the HighResMIP simulations in CMIP6, the average solar radiation in the upper reaches of Weihe River basin from 2021 to 2040 will be lower than that from 2011 to 2020, and the restricting effect of light factors on maize growth will be more obvious. Maize planting areas should draw advantages and avoid disadvantages, and take effective measures to reduce the adverse effects caused by insufficient light, such as selecting excellent varieties, rationally distributing planting density, and appropriately reducing leaf area coefficient.

Key words: upper reaches of Weihe River basin, maize, light suitability, variation, analysis

YAO Xiaoying, ZHANG Bei, YAO Yubi, WANG Zhenguo, LIU Hengjun. Variation Characteristics of Light Suitability of Maize in the Upper Reaches of Weihe River Basin from 1971 to 2020[J]. Chinese Agricultural Science Bulletin, 2023, 39(17): 43-49.

Figures/Tables 10

References 28

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项目	播种—出苗期	出苗—拔节期	拔节—抽雄期	抽雄—乳熟期	乳熟—成熟期	全生育期
1971—2008	0.2378	0.3232^*	0.3964^**	0.3323^*	0.0935	0.2581^*
1991—2020	0.0619	0.2893^*	0.4454^**	0.2977^*	0.0622	0.3024^*

项目	播种—出苗期	出苗—拔节期	拔节—抽雄期	抽雄—乳熟期	乳熟—成熟期	全生育期
1971—2008	0.2378	0.3232^*	0.3964^**	0.3323^*	0.0935	0.2581^*
1991—2020	0.0619	0.2893^*	0.4454^**	0.2977^*	0.0622	0.3024^*