Dynamic evaluation and spatial differentiation on ecological security of urban agriculture in Xi'an City

Urban Farm DB summary

Using entropy value analysis, obstacle degree analysis, and GIS spatial analysis, this study built an urban agro-ecological security evaluation system for Xi'an, China, and found the security index rose from 0.44 in 2002 to 0.68 in 2011. Urbanization had a large negative influence on the sustainability and system stability of urban agricultural resources but a positive influence on output growth and development assurance, while the average obstacle degree of the key limiting factors declined from 12.47% in 2003 to 7.05% in 2006 and 4.97% in 2011; the security index also varied spatially across districts, lowest (≤0.15) in Lianhu, Beilin, and Xincheng and highest (>0.35) in Chang'an and Yanliang, reflecting differences in agricultural production conditions, transport access, and linkage to the urban economy.