| 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 |
| Key Words: cultivated land ecological security entropy weightset pair analysis PSR model obstacle factor Northwest region |
| Author Name | Affiliation | | LIU Rui | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China； College of Tourism Management,Chaohu University, Hefei, Anhui 238000, China | | LI Tao | Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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| Abstract: |
| 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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