东北地区冬半年积雪与气温对冻土的影响
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Influence of snow and temperature on the depth of frozen soil in winter half year in Northeast China
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图3. 1964—2017年东北地区冬半年平均最大冻土深度(a)及其变化趋势(b)的空间分布(“+”为通过0.05信度检验的站点) |
Fig.3. Spatial distribution of average maximum frozen soil depth (a) and its variation trend (b) in winter half year in Northeast China from 1964 to 2017 (+ denotes the trend significant at the 95% confidence level) |
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