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, 马雪晴, 和骅芸, 任思琪, 唐书玥, 赵金媛, 潘志华, 王靖, 潘学标, 胡琦

Characteristics of dry and wet changes in sunflower growing areas in northern China and their causes from 1961 to 2020
WANG Xiaochen, MA Xueqing, HE Huayun, REN Siqi, TANG Shuyue, ZHAO Jinyuan, PAN Zhihua, WANG Jing, PAN Xuebiao, HU Qi
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)