浙江省杭州湾地区城市规划对耕地保护的潜在影响

Potential impact of urban planning on cultivated land protecting in Hangzhou Bay area in Zhejiang Province

以浙江省沿杭州湾经济快速发展地区为例,结合土地利用现状、城市规划和农用地分等数据,利用GIS空间分析方法,探讨了该地区未来城市建设用地扩展及其对耕地数量和质量的潜在威胁。结果表明:研究区是浙江省耕地资源分布相对集中且质量较高的地区,规划期间建设用地扩展迅速,新增用地面积达9.4×104hm2;按照现有规划,研究区将减少耕地面积7.1×104hm2,耕地是规划新增建设用地的主要来源,约占75%;优质耕地的减少量大,减少速度快,一至五等耕地的减少量占67.5%,一、二等耕地到2020年将分别减少37.16%和35.52%。建议应用农用地分等成果对规划占用的耕地进行质量评价,调整规划方案,减少建设对耕地数量质量的影响,保障粮食生产能力。

Based on GIS spatial model and combination of land use data,urban planning data and farmland grading data,the potential urban sprawling and the risk to cultivated lands in Hangzhou Bay area were analyzed.Results revealed that the study area was characterized by high quality and density cultivated lands,whereas the construction lands would expand 9.4×104hm2 in this area from 2005 to 2020.Therefore,cultivated lands would decrease 7.1×10 4hm2,which was the main source of new construction lands occupying 75% according to present urban planning.Cultivated lands with high quality would decrease largely and rapidly.In the total decreased area,cultivated lands ranking from 1 to 5 according to farmland grading were 67.5%,and those ranking 1 and 2 would decease 37.16% and 35.52% respectively from 2005 to 2020.Suggestions include that a quality assessment of the occupied cultivated lands is carried out with farmland grading,and urban planning is adjusted to reduce the impact of construction on cultivated lands to safeguard the ability of food production.