融化期 meaning in Chinese

thaw period

The results demonstrate that the upper limit of permafrost in this area had declined from 1970s to the middle phase of 1990 , and permafrost has appeared degenerate tendecy , but since middle 1990s , permafrost have a stable state ; ground temperature of roadbed near the earth surface is higher than that of the natural ground , thawing time of roadbed near the earth surface is longer than that of the natural ground , the heat income within the permafrost is greater than the heat release from the permafrost during anannual period , the heat accumulation within the permafrost is temporarily appeared as temperature rising , but with the heat accumulation within permafrost growing up year by year , permafrost temperature will become higher gradually , and strong thawing of permafrost could be happened in the region
结果表明：风火山地区从20世纪70年代到90年代中期冻土上限下降，冻土出现退化现象，从90年代至今冻土趋于稳定；路基近地表地温明显高于对应天然地表下的地温，路基近地表经历的融化期长于对应天然地表，进入多年冻土区的热收支也呈现出吸热明显大于放热的周期性变化，进入多年冻土的热积累暂时以增高地温耗热为主，但随着冻土吸热量的逐年积累、冻土温度的不断升高，本区冻土可能发生强烈融化。