城镇宗地绿化差异定量评价

Quantitative evaluation on the difference of canopy cover of town parcels

城镇宗地绿化是城镇生态建设挖潜的主要途径,宗地绿化差异则是城镇生态建设规划的基础信息。以宁夏平罗县城为例,综合城镇地籍数据、遥感数据和实地调查数据,采用多因素分析法、离散度分析法和变异函数分析法,定量评价平罗县2390宗居住、商业和事业单位用地的绿化差异。结果表明城镇宗地绿化利用水平差异显著,绿地利用程度、效果和效率均较低,绿化潜力大,可通过旧城改造,加大绿地管理,建立专业队伍,改革附属绿地管理体制等来挖掘。造成这种差异的原因主要有:自然制约因素、宗地使用者的绿化意识以及宗地面积的制约。空间变异函数分析还表明,绿化差异不存在空间相关性,是空间非平稳过程,表明这种差异主要是人为造成的。

The difference of canopy cover of town land is basic information in small cities and towns for evaluating ecological potential for ecological development, and China pays highly attention to against the serious challenge from urban environment. Taking Pingluo County Town as a study case, the paper quantitatively evaluated ecological utilization of total 2390 parcels of residential land, commercial land and public utility land through cadastral Database and Pleiades image and field investigation by the methods of multi-factors analysis, dispersion analysis, histogram analysis and variation function diagram. Results indicated that different parcels had a dominant difference, ecological level, degree and efficiency were lower, and the greening potential was immense, which could be exploited by old downtown renovation, intensive greenland management, professional planting, and so on. Variation function diagram showed that the ecological utilization had no spatial correlation, and it was an unstable spatial process, which implied that the difference was mainly caused by anthropogenic forces.