Study on Spatial and Temporal Variation of Freeze-Thaw Index and Permafrost Distribution in Heilongjiang Province from 1971 to 2019

SONG Cheng-jie, ZHOU Yan-zhang, DAI Chang-lei, TU Wei-ming

China Rural Water and Hydropower . 2025, (4): 192 -200 . DOI: 10.12396/znsd.241107