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兰州市七里河区农用地分等更新评价与分析

DOI: 10.6046/gtzyyg.2012.03.25, PP. 140-145

Keywords: 农用地,分等更新,等别,七里河区

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Abstract:

利用高分辨率QuickBird和WorldView图像,提取七里河区农用地图斑信息,并以农用地图斑为研究对象,对农用地进行分等更新评价与分析。根据七里河区农用地的实际情况,采用特尔斐法,结合专家意见,确定了地形坡度、有效土层厚度、土壤pH值、地表岩石露头、土壤有机质含量、表层土壤质地及灌溉保证率等7个评价因素作为农用地分等更新的评价因子。应用详查图斑法和农用地分等计算模型,对七里河区范围内的农用地图斑进行修正与更新。分等更新结果表明,七里河区农用地自然质量总体呈下降趋势;七里河区农用地土地利用没有发生重大变化,农用地投入产出水平有所下降,各个等别呈现一定的空间分布规律。

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