| 张合兵,王世东,刘毅.市域尺度土地生态质量空间分异及其主控因子分析——以焦作市为例[J].干旱地区农业研究,2017,35(5):58~65 |
| 市域尺度土地生态质量空间分异及其主控因子分析——以焦作市为例 |
| 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 |
| 中文关键词: 土地生态质量 主控因子 热点分析 决策树 主成分分析 |
| 英文关键词:land ecological quality main control factors hot spot analysis decision tree principal component analysis |
| 基金项目:国家自然科学基金项目(41541014，41301617)；中国煤炭工业协会指导性计划项目(MTKJ-2015-284)；中国博士后科学基金(2016M590679)；河南省高等学校重点科研项目(17A420001)；河南省高校基本科研业务费专项资金资助(NSFRF1630)；河南理工大学创新性科研团队资助(B2017-16)；河南省高校科技创新团队支持计划(18IRTSTHN008)；河南理工大学青年骨干教师资助计划项目 |
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| 中文摘要: |
| 以焦作市村级行政区为评价单元，从土地生态本底、生态结构、生态效益和生态胁迫4个方面构建指标体系，运用热点分析模型对焦作市土地生态质量的空间分异规律进行研究，将焦作市土地生态质量根据冷热点分值划分为5个等级。在热点分析的基础上，利用CART算法构建分类决策树，根据控制变量法得到的决策树分类精度对研究区内22个生态因子对全局土地生态质量的贡献度进行分析，最后用主成分分析法再确定每一个生态类型区的主控因子。结果表明，焦作市的土地生态质量大致呈现出“核心——边缘”结构，即由城镇中心向远郊土地生态质量呈上升趋势，而由水库、河流、风景区向城区方向土地生态质量呈下降趋势。其生态因子中生态服务价值具有最高贡献度，对焦作市土地生态质量影响最大。各级生态类型区由于空间位置的差异，影响其土地生态质量的主控因子也有显著差异。一二级生态空间分异类型区主控因子受人为因素影响较大，四五级生态空间分异类型区则主要受自然因素的影响，三级生态空间分异类型区受人为与自然双重因素影响，主控因子最多。 |
| 英文摘要: |
| 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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