Study on Gra ssland Re source Changing Trend of Farm2Herd Intervein Zone in We stern Jilin Province

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1 2005,27 (1) :86 91 Journal of Jilin Agricultural University Ξ 1, 1, 1, 2, 1 (1., ; 2., ) :,, : hm 2,1175 %,,,, : ; ; ; ; : S81218 : A : (2005) Study on Gra ssland Re source Changing Trend of Farm2Herd Intervein Zone in We stern Jilin Province DU Chong 1, LIN Nian2feng 1, TANGJie 1, LI Yue2fen 2, LI Yan2mei 1 (11 College of Resource and Environment, Jilin University, Changchun ; 21 College of Earth Sci2 ence, Jilin University, Changchun ) Abstract : Based on the technology of RS and GIS, the paper extracted the dynamic data of and analyzed the dynamic change of Western Jilin from 1989 to The result showed that myria2 hectare of decreased during the 12 years and annual decreasing rate was 1175 percent1 A great deal of low2covered decreased and was turned into farmland, alkaline soil and other types of 1 The stress of population resulted in the over2grazing and over2reclamation1 As a result, the de2 velopment of regional economy was confined due to the decrease of and the low covering1 The comprehensive measures of management, biology and engineering should be taken to effectively recover and develop the resources1 Key words : farm2herd intervein zone ; resource ; RS ; GIS ; Western Jilin [1 ],,, [2 ] 400 mm,, [3 ],,,, [4 ],,,, [5 ] 2 10 (), 1 8 Ξ : ( , ) : (19782),,, :3S :

2 27 1 : 87,, mm [6 ],,, [7 ], [8 ],,, [9 ],,,, Landsat/ TM,TM , 7 9,, 5,4,3 1 25, 3, TM, 2, ,,, Arc/ info,coverage,, 2 211,,,,,, > 70 %, 70 % 50 % 50 % 30 %, TM51413 ( 1, 2), arc/ info ( 1) 1 Table 11 Change s of land type area in We stern Jilin province Type High2covered Middle2covered Low2covered Forest land Water area Building area Sand Alkaline soil Wetland Paddy field Dry farmland 1989 Area of 1989 / % 2001 Area of 2001 / % Total area of change / % of change / % of annual change

3 Fig1 11 Interpretation of satellite image of We stern Jilin plain,,,,, , ( GIS),, ,,, ( ) ( ) Table 21 Gra ssland dynamic change s of citie s or countie s in We stern Jilin province ( ) County or city Baicheng Taonan Da an Zhenlai Tongyu Songyuan Changling Qian Qianguo Fuyu Total area Area of / % Area of / % Decreased area Annual decreased area / % Annual decreased percent hm hm 2, %, 1189 hm 2,1175 % 20 %

4 27 1 : 89, %, %, hm 2,,, 4165,3128,2175 hm % % ,, Table 31 Transition of high2covered gra ssland Transition of Area / % Decrease or increase of High2covered to dry land High2covered to forest land High2covered to paddy field Middle2covered to high2covered ( ) ( ) 3 : ,, %, %,12132 %,,, 4,,, ; ; ;, Table 41 Transition of middle2covered gra ssland Transition of Area / % Decrease or increase of Middle2covered to dry land Middle2covered to high2covered Middle2covered to alkaline soil Middle2covered to paddy field Low2covered to middle2covered Water area to middle2covered ( ) ( ) , ,,,

5 , %,, (9413 %), 517 %,,,, 5 Table 51 Transition of low2covered gra ssland,,,,,1998,, ( ),, Transition of Low2covered to alkaline soil Low2covered to dry land Low2covered to middle2covered Low2covered to sand Water area to low2covered Wetland to low2covered Area / % Decrease or increase of / myriahectare ( ) ( ) ,,,,,,,, %, %,,,, ;,, 4 1) TM,,

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