| 刘锐,李涛.基于熵权集对分析的西北地区耕地生态安全水平差异比较[J].干旱地区农业研究,2019,37(6):274~282 |
| 基于熵权集对分析的西北地区耕地生态安全水平差异比较 |
| Comparison of differences in cultivated land ecological security levels based on entropy weight set analysis in Northwest China |
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| DOI：10.7606/j.issn.1000-7601.2019.06.38 |
| 中文关键词: 耕地 生态安全 熵权集对分析 PSR模型 障碍因子 西北地区 |
| 英文关键词:cultivated land ecological security entropy weightset pair analysis PSR model obstacle factor Northwest region |
| 基金项目:国家自然科学基金项目(41571139)；安徽省教育厅人文社科重点项目(SK2017A0485) |
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| 中文摘要: |
| 耕地生态安全是关系到粮食安全和人类生存发展的重要问题。构建基于PSR模型的耕地生态安全评价指标体系，运用熵权集对分析方法和障碍度模型对西北地区耕地生态安全水平与障碍因子进行差异比较分析。结果表明：(1)2002—2016年西北地区耕地生态安全总体水平不断提高，但安全等级在地区内部差异明显，2002—2008年，新疆、甘肃、宁夏维持“临界安全”等级不变，青海、陕西联系数主值分别为0.2334、0.2019，安全等级上升为“较安全”。2008—2016年，新疆联系数主值由0.0499提升为0.2692，安全等级上升为“较安全”；甘肃、宁夏维持“临界安全”等级；青海、陕西维持“较安全”等级；(2)西北地区压力和响应障碍度均值由2002年的52.434、26.270下降为2016年的38.479、17.353，状态障碍度均值则由21.296上升为44.168。要素层2002年和2016年障碍度均值分别为45.457、32.732、21.811，影响西北耕地生态安全水平障碍因子排序依次为压力、状态、响应。2002年西北地区耕地生态安全水平与压力、状态、响应障碍度的相关系数分别为-0.226、0.120、0.055；2016年分别为-0.830、0.851、-0.661。新疆、青海和陕西出现的耕地生态安全等级提升与状态障碍度大幅度增加有关；(3)新疆和青海耕地生态安全值上升源于人均水资源量的增加；陕西耕地生态安全值上升得益于耕地生产率的提高和耕地环境的改善，但城市建成区的扩张和水资源的短缺制约了生态安全等级提升；甘肃、宁夏耕地生态安全维持等级不变，主要受制于耕地数量的减少和耕地质量的下降等因素。针对西北各地区耕地生态安全提出升级建议。 |
| 英文摘要: |
| The ecological security of cultivated land is an important issue related to food security and human survival and development. Based on the PSR model, the evaluation index system of ecological security for cultivated land was constructed, and the difference between the level of cultivated land ecological security and obstacle factors in Northwest of China was analyzed by entropy weight set analysis method and obstacle model. The results showed that: (1) From 2002 to 2016, the overall level of ecological security of cultivated land in Northwest of China continued to improve, but the security level within the region was significantly different. Xinjiang, Gansu, and Ningxia maintained the level of “critical safety” from 2002 to 2008 whilemain value of the connection number of Qinghai and Shaanxi was 0.2334 and 0.2019, respectively, and the security level was upgraded to “relative safety”. From 2008 to 2016, the main value of connection number of Xinjiang increased from 0.0499 to 0.2692 and the security level was upgraded to “relative safety”. Gansu and Ningxia maintained the level of “critical safety”. Qinghai and Shaanxi maintained the level of “relative safety”; (2) From 2002 to 2016, the mean value of stress and response barriers in Northwest of China decreased from 52.434 and 26.270 in 2002 to 38.479 and 17.353 in 2016, respectively, while the mean value of state barriers increased from 21.296 in 2002 to 44.168. In 2002 and 2016, the average barrier value of each factor layer was 45.457, 32.732, and 21.811, respectively. The order of the barrier factors affecting the ecological security level of cultivated land in Northwest of China was pressure, state, and response. In 2002, the correlation coefficients of cultivated land ecological security level, pressure, state, and response obstacle degree in Northwest of China were -0.226, 0.120, and 0.055, respectively, and in 2016 were -0.830, 0.851, and -0.661, respectively. The improvement of cultivated land ecological security level in Xinjiang, Qinghai, and Shaanxi showed a significant positive correlation with state obstacle degree; (3) The increase in ecological security value of cultivated land in Xinjiang and Qinghai was due to the increase of per capita water resources while the increase of ecological security value of cultivated land in Shaanxi Province benefited from the improvement of productivity and environment of cultivated land. However, the expansion of urban built-up areas and the shortage of water resources restricted the improvement of ecological security level. The maintenance level of ecological security of cultivated land in Gansu and Ningxia is mainly restricted by the reduction of cultivated land quantity and the decline of cultivated land quality. Some suggestions on upgrading the ecological security cultivated land in Northwest region were put forward. |
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