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
王晓晨1,2(), 马雪晴1,2, 和骅芸1,2, 任思琪1,2, 唐书玥1,2, 赵金媛1,2, 潘志华1,2, 王靖1,2, 潘学标1,2, 胡琦1,2()
Characteristics of dry and wet changes in sunflower growing areas in northern China and their causes from 1961 to 2020
WANG Xiaochen1,2(), MA Xueqing1,2, HE Huayun1,2, REN Siqi1,2, TANG Shuyue1,2, ZHAO Jinyuan1,2, PAN Zhihua1,2, WANG Jing1,2, PAN Xuebiao1,2, HU Qi1,2()

图5. 1961—2020年中国北方向日葵种植区生长季SPEI的M-K突变检验(a)及年代际尺度不同等级干旱出现频率(b)

Fig.5. The M-K mutation test of SPEI during the growing period of sunflower in planting areas in northern China from 1961 to 2020 (a) and inter-decadal variation of occurrence frequency of drought with different levels (b)