多年冻土退化 permafrost degradation ; degradation of permafrost frozen soil
多年冻土退化趋势评估 assessment of permafrost degradation trend
气候变化和人类活动加剧，致使我国东北地区多年冻土退化严重。
The climate change and the intensifying human activity cause the permafrost degradation in Northeast China.
岛状多年冻土是大片连续多年冻土退化的边缘地带，具有平面上不连续特点。
Patchy permafrost is the edge of vast and continuous permafrost zone which is degrading, it is discontinuous horizontally.
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