1961—2020年中国北方向日葵种植区干湿变化特征及其成因分析
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Characteristics of dry and wet changes in sunflower growing areas in northern China and their causes from 1961 to 2020
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图4. 1961—2020年中国北方向日葵种植区生长季不同等级干旱频率空间分布(单位:%) |
Fig.4. The spatial distribution of occurrence frequency of drought with different levels during sunflower growth period in planting areas in northern China from 1961 to 2020(Unit: %) |
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