CONTENTS CoNTENTS Abstract in Chinese . . . .I Abstract in English........................................................................................... .... .. .......... ...III .................................... ....... ....,.....,................ .......... ....... ......... ..................1 Basis of vertical title... ...... . . ... . ... 1 Research purpose and significance.. .... ......................... .............. ............... .............1 Effects of freezing thawing soil water and heat on ecological water environment..2 Effects of water and heat of freezing and thawing soil on agricultural production..3 Research status at home and abroad.......................................... ........ ..............................4 Research progress in freezing and thawing soil physics.............................................4 Mechanism of freezing and thawing soil element migration... , ... .... . . . 5 Response of water and heat in freezing and thawing soil............................................6 Hydro thermal coupling mechanism offreezing and thawing soil .7 Research content and Technology Roadmap..........,.............................................. ............9 Research contents.......................................................... ...............................................9 1 Technology Roadmap................. ................................................................................1 0 conditions and methods.....................................................................................................1 1 General situation of study al‘ea... .. ..... ......,....... ..............。.... .......... .....................1 1 Physical geography . . .. . . . , l l Topogl‘aphic featm+es.. .. ...... ... .. .... .. ...... ... ..12 Climatic conditions... .. .. .. . . . ... .. . . .. ... .. 12 Experimental d
