农用土地资源利用的可持续性评价--以河北省曲周县为例

从人口与土地、土地与粮食以及农业与环境几个方面剖析了河北省曲周县土地资源利用的可持续性。结果表明：虽然曲周县总耕地和人均耕地面积均持续减少，但由于障碍因素的控制，土地生产力在中低产田的改造中持续提高，人均粮食水平总体呈增长态势，表明曲周县的土地资源利用对保证粮食供应方面的发展是可持续的。但人口的增长和因污水灌溉造成的土壤Cd、Cu和Zn等的明显污染倾向，对土壤质量的维持构成较大威胁。个别地区的地下水硝酸盐含量超过标准也预示着化肥投入的合理性必须引起重视。

Sustainability Evaluation of Farmland Utilization in Quzhou County

The sustainability of farmland utilization in Quzhou County was evaluated in terms of population and arable land, and arable land and grain output as well as agriculture and environment. The result showed that although arable area and per capita arable area decreased continuously, the farmland productivity improved steadily in reforming the farmland with medium or low yields, and per capita grain output presented a increasing trend in general, which indicated that the land use in Quzhou County was sustainable in ensuring grain supply in the past decades. However, the population growth and the pollution of Cd, Cu, Zn due to wastewater irrigation formed a rather threat against sustainable development. The fact that the nitrate content of groundwater in exceptional areas surpassed the drinking water standard indicated that reasonable application of fertilizer should be regarded.