基于生态足迹的土地利用规划生态成效定量分析——以河北省廊坊市为例

我国新一轮土地利用总体规划修编工作势必要求对未来区域土地利用变化的生态影响进行全面、科学、定量的评价。目前,生态足迹及其相关模型已延伸至诸多领域,但应用于土地利用规划领域的研究尚少。论文以廊坊市为例,通过计算人均生态足迹和生态承载力的变化率和剪刀差,分析廊坊市土地利用总体规划(1997-2010年)规划实施期(1997-2004年)和规划影响期(2005-2010年)的人均生态足迹与生态承载力的变化趋势及差异,进而分析土地利用规划的生态成效。研究结果表明:①规划期(1997-2010年)廊坊市人均生态足迹与生态承载力呈反向发展趋势,人均生态赤字持续增加;②规划期(1997-2010年)廊坊市人均生态足迹与生态承载力变化趋势差异以2000年为界先减小后增大,未来几年内廊坊市生态环境的变化趋势不容乐观;③廊坊市土地利用总体规划(1997-2010年)取得了一定生态成效,但规划预期生态供给难以实现。因此,廊坊市新一轮土地利用总体规划(2005-2020年)重点应从片面强调建设用地数量提升向优化土地利用结构布局转变,加强科学、节约、集约土地利用。

Quantitative Analysis of Ecological Effects of General Land Use Planning Based on Ecological Footprint - A Case Study in Langfang City

Evaluating human effects on the ecosystem is a critical issue in the process of general land use planning.In recent years,Ecological Footprint(EF)has been an widely accepted tool to quantify this kind of assessment in many fields.However,only few studies have addressed the problem of EF in the realm of land use general planning.Taking Langfang city as a case study,this paper develops an approach to quantitatively analyze the trends of EF and BC over the planning period in general land use planning and to evaluate the ecological effects of the land use general planning. In this paper,we introduced the concepts of change rates and scissors difference to indicate the tendencies of EF and BC time series.We calculated the change rates and scissors difference of per capita EF and BC over planning period of general land use planning(1997-2010),investigated the developing process during the past eight years(1997-2004),and predicted the future tendency in the following six years(2005-2010).Based on these,we assessed the possible effects of general land use planning(1997-2010) on the local ecosystem,and attempt to present suggestions for the following general land use planning(2005-2020). The results show that: 1)In Langfang city,trends of the per capita EF and BC are on the way round,and the ecological deficit enhanced from 1997 to 2010.The per capita EF increased from 1.583 ha in 1997 to 2.823 ha in 2010,while the per capita BC decreased over years from 0.563 ha in 1997 to 0.414 ha in 2010.Meanwhile,the ecological deficit in 2010 will be 2.619 times greater than that of in 1997.2)In Langfang city,the scissors difference between the trends of EF and BC time series had been decreasing until 2000,it began to rise after year 2000.This growth direction is not what we expected,with the aspect of ecological equilibrium.3)The general land use planning(1997-2010)of Langfang city had produced some positive effects on the local ecosystem.Thus,the ecological deficit at 2000 was lower than the expected,and the ecological difference had also been reduced during 1997-2004.But the expected biological capacity at 2010 can hardly be realized following this trend.The direction of reducing the ecological deficit by extensive land use is against the sustainable development.The general planning(2005-2020) of Langfang city should pay more emphasis on the land use spatial layout not rather than on the land use quantities layout and strengthen scientific,economical,intensive land use.