基于SPEI的广西桑树不同生育期干旱时空分布特征

刘芳, 陈燕丽, 黄珩, 李先平, 黄维

Spatiotemporal distribution characteristics of drought during different growth periods of mulberry in Guangxi based on SPEI

LIU Fang, CHEN Yanli, HUANG Heng, LI Xianping, HUANG Wei

图2 1961—2025年广西桑树萌芽期（a、b）、展叶期（c、d）、旺长期（e、f）和落叶休眠期（g、h）SPEI Morlet小波分析局部（a、c、e、g）和全局（b、d、f、h）功率谱 （左图所有黑色闭合等值线区均代表通过0.05显著性检验的周期区，交叉斜线填充的影响锥区域结果不具备统计有效性；右图黑色虚线为0.05显著性检验线）

Fig. 2 Morlet wavelet local (a, c, e, g) and global (b, d, f, h) power spectra of SPEI during the germination stage (a, b), leaf expansion stage (c, d), vigorous growth stage (e, f) and defoliation-dormancy stage (g, h) of mulberry in Guangxi from 1961 to 2025 （All closed black contours areas in the left panel denote periodic regions passing the significance test at the 0.05 level. The cone of influence filled with cross slashes contains results without statistical validity. The black dashed line in the right panel represents the 0.05 significance threshold line）