Ecological environment evaluation of cultivated land in coastal intensive agricultural areas by GIS

Taking Guangrao County of Shandong Province as a case, the ecological environment evaluation of cultivated land in coastal intensive agricultural area was explored. Overlay method between soil map and land use map was adopted to produce evaluation units, evaluation factors were chosen by Delphi approach and cluster analysis with their weights determined by AHP method. Finally the ecological environment grades of cultivated land were evaluated by fuzzy discrimination method. The results show that the ecological environment of cultivated land in Guangrao County is good in general. The area of the first and the second grades is 39.93% of the total area. That of the third and the fourth grades is 45.75%, and that of the fifth and the sixth grades is only 14.33% of the total area. Ecological environment grades have an obvious reverse relationship with the intensification of cultivated land use according to their gradual spatial transition from northeastern coastal area to southwestern area, in addition, the ecological environment grades are obviously affected by different cultivated land using types. This study explored the technical methods of the ecological environment evaluation in coastal intensive agricultural area and delineated the influence of the intensive land use to the ecological environment; therefore, this study has noticeable significance to the sustainable use of cultivated land resources and its environmental protection for intensive agricultural area.