VALUATION OF LAND SUITABILITY IN TYPICAL CROPS PLANTING AREA IN WESTERN SICHUAN PLATEAU AND THEIR DRIVING FORCES
Western Sichuan plateau have a feature of weak ecological environment and low economic development.This research aims to carry a typical crops suitability analysis,so as to provide an accurate and effective method for typical crops and broadening minorities' source of wealth.Based on the land use data in Sichuan province,this article used the analytic hierarchy process(AHP)method and the grid index model to establish a three-level evaluation index system,including target layer,rule layer and factor layers,for the suitability of typical crop land in the Western Sichuan Plateau.The results were listed as follows.(1)The index weight results showed that the largest weight of the first indicators was of the climate condition indicators,the smallest weight was of the socio-economic conditions.(2)The high suitable area for planting Chinese cabbage in Western Sichuan Plateau was 16 525 hm2,that were in the middle reaches of Dadu river and Minjiang river basin;the high suitable area for planting apple was 361 215 hm2,that were in the canyon area for Dadu river and Minshan mountain region;the high suitable area for planting pear was 310 253 hm2,that were in valley areas of Minjiang river's middle stream and the Minjiang river basin;the high suitable area for planting cherry was 168 914 hm2,that were in valley and mountainous region of Dadu river and Minjiang river;the high suitable area for planting walnut was 419 137 hm2,that were in valley of Jinshajiang river,Yalong river,Dadu river and Minjiang river.(3)From the perspective of county-level spatial scale evaluation,the most recommended counties(cities)for planting walnuts and pears in the Western Sichuan Plateau were 22 and 16,respectively.There were only 3 counties(cities)recommended for planting Chinese cabbage.(4)The agricultural industry in the Western Sichuan Plateau was dependent on natural and social factors.The local natural conditions with good light and temperature,and climate varied vertically in belt-shape zones,but it was often affected by extreme weather such as low temperatures;The proportion of arable land was small,scattered,and the quality of arable land was low;Landform was complex with low latitude,high altitude,towering terrain and fragmented terrain;Transportation and irrigation facilities were weak,and natural socio-economic factors affected the development of typical crop industries in the Western Sichuan Plateau.In summary,the results are consistent with the current situation of typical crops planting in Western Sichuan Plateau.Land suitability in typical crops planting area is dependent on endogenous influencing factors and exogenous influencing.But this study neglected the function of land resource,the mode of operation,technology,law,policy and market.
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