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| Urban land ecological security assessment of oasis in arid area based on catastrophe theory—A case study of Urumqi |
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| Abstract: |
| The urban land ecological security is the important foundation of urban sustainable development.According to the characteristics of land use status in Urumqi，based on PSR framework and catastrophe theory，the urban land ecological security evaluation index system and catastrophe progression model were built，and the degree of land ecological security of Urumqi in 2009 to 2013 was evaluated by using catastrophe progression method. Results showed that: comprehensive land ecological security level in Urumqi during 2009 to 2013 experienced basic security（ 2009） →the safer（ 2010-2012） → basic safety（ 2013） of the development process. From the criterion level，the pressure system security level decreased year by year，security level experienced very safe → safer → unsafe of plummeting development process; State system security level general showed a upward trend，security level experienced basic security → the safer → basic safety of the development process；Response system security level gradually rose，security level experienced unsafe → basic security → the safe →very safe of straight rise development process. The main factors affecting the land ecological security in Urumqi were as follows: average per capita water resources，unit farmland fertilizer load rate，unit farmland pesticide loadrate，population density，natural population growth rate. |
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