中国东北兴安岭地区年冻融频次的分布规律
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Distribution law of annual freeze-thaw frequency in Xing’anling region of Northeast China
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图6. 兴安岭地区各气候区Ut,N 的变化情况 |
Fig. 6. Variation of Ut,N of four climate zones in Xing’anling region: cold temperate humid area (a), middle temperate humid zone (b), middle temperate sub-humid zone (c) and middle temperate semi-arid zone (d) |
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