| Research on spatial differentiation of land ecological quality and main controlling factors identification based on city scale: A case study of Jiaozuo City |
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| DOI：10.7606/j.issn.1000-7601.2017.05.09 |
| Key Words: land ecological quality main control factors hot spot analysis decision tree principal component analysis |
| Author Name | Affiliation | | ZHANG He-bing | School of Surveying and Land Information Engineering, He'nan Polytechnic University, Jiaozuo, He'nan 454000, China | | WANG Shi-dong | School of Surveying and Land Information Engineering, He'nan Polytechnic University, Jiaozuo, He'nan 454000, China | | LIU Yi | School of Surveying and Land Information Engineering, He'nan Polytechnic University, Jiaozuo, He'nan 454000, China |
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| Abstract: |
| Using the village administrative district of Jiaozuo City as the evaluation unit, an index system including 4 criteria layers of basis, structure, efficiency and stress was established. The spatial variation of land ecological quality was studied by using hot spot analysis. The land ecological quality of Jiaozuo City based on the hot and cold spots were divided into 5 grades. The contribution of the 22 ecological factors were analyzed by the classification accuracy of decision tree in control variable method using the CART algorithm to construct decision tree based on the hot spot analysis. Finally, the main controlling factors of each ecological type region were determined using the principal component analysis method. The results showed that the land ecological quality of Jiaozuo city showed a characteristic of “core-periphery” structure, which the land ecological quality were declining from the town center to the outer and the land ecological qualityarising from the reservoir, river, scenic area to the city. The ecological service value of the ecological factor has the highest degree of contribution and it has the greatest impact on the land ecological quality of Jiaozuo city. Due to the differences space location of each ecological type region, the main factors affecting the land ecological quality also has the remarkable difference. The main control factors of grade one and two ecological regions were more influenced by man-made factors. The main control factors of grade four and five ecological regions were mainly influenced by man-made factors. The grade three ecological regions were influenced by both human and natural factors, and it has the most main control factors. |
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