| The quality of agricultural land mainly reflects the internal q(?) and land use efficiency difference. The quality evaluation in Duolun county has a far-reaching influence on land management, and it is not only an important basic work, but also has a wide range of practical significance. Therefore, holding the situation of agricultural land quality comprehensive, systematic and accurate is not only the need for the formulating the land policy and deepening the land use system in our nation, but also can guide the healthy development of industry.At the base of domestic and foreign scholars on the synthetical evaluation of agricultural land, it uses the remote sensing images and GIS technology for data processing, and extracts the spatial information of land use in Duolun county, in combination with the different thematic maps of land use, using Delphi method and AHP to determine the evaluation factors and their weighting factors. Based on using two sets of evaluation methods including Fuzzy evaluation method and graduation method to evaluate the quality of agricultural land in Duolun county, it combines the geostatistics and landscape ecology method to study the spatial distribution patterns of agricultural land quality and analyzes its influential factors. The research gets the following conclusions:(1)Adopting the Fuzzy method to evaluate the quality of agricultural land, it is concluded that the farmland belonged to "better" level as a whole in Duolun county, among them, Duolunnuoer is in highest rank for "good". The quality of farmland in Dabeigou, Caimushan and Dahekou are in "better" level. The level of farmland quality in Duolun county is higher overall.(2)Adopting the classification and grading evaluation to evaluate the quality of farmland, it is concluded that the agricultural land in Duolun county is divided into four levels. The level one is in best quality of agricultural land in Duolun county for 714.52 hm2, which accounts for 1.39% in the whole farmland in Duolun county; level 2 is in better quality of cultivated land for 5737.66 hm2, accounting for 11.13% in the total farmland; the area of cultivated land in level 3 is 34059.13 hm2,which accounts for the highest percentage to 66.08% in total area. The quality of level 4 is poorer for 11031.33 hm2, accounting for 21.40%. The order of four level in cultivated land area is three>four>two>one.(3)Four townships spatial distribution of agricultural land overall perform similarly which are flared making its town as center. Level 1 agricultural land is mainly distributed in the township center; level 2 agricultural land is distributed around level 1;level 3 agricultural land is distributed around level 2;level 4 is located in the periphery.(4) The difference of agricultural land resource in natural quality and economic quality distribution in Duolun county is obvious and the grades of it has the laws of the higher in the west and lower in the east, while using quality distribution by central region to outside the present law of gradually reduced. Judging from the space structure, the distribution of agricultural land quality in Duolun county are diversified, the diversity index in Caimushan is highest to 0.9296, followed by Dabeigou and Dahekou, the diversity index in Duolunnuoer is lowest. Because the agricultural land area in every level in Caimushan is more balanced compared with other towns, and the farmland in Dullunnuoer is mainly in level 2 and level 3, which lead to the low diversity index. The dominance index is similar to diversity index. The performance of evenness index is opposed to diversity index. The spatial distribution pattern of agricultural land quality is effected by the natural and human factors, which lead to the peculiar spatial pattern. |
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