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9. 1990—2014年东北地区NDVI的年际变化 |
Fig. 9. Interannual variation of NDVI in Northeast China from 1990 to 2014 |
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