1951年以来中国无霜期的变化趋势

宁晓菊, 张丽君, 杨群涛, 秦耀辰

Trends in the frost-free period in China from 1951 to 2012

Xiaoju NING, Lijun ZHANG, Quntao YANG, Yaochen QIN

图4 中国初、终霜日标准差的空间分布

Fig. 4 Standard deviation of the first frost date and last frost date in China