基于GIS的青岛市耕地地力评价与改良分区研究

Evaluation of Fertility and Amelioration Regionalization of Cultivated Land in Qingdao City Based on GIS

以青岛市为研究区域,在地理信息系统(GIS)和县域耕地资源评价系统的支持下,建立耕地地力评价指标体系,综合运用综合指数(IFI)法和累积曲线分级法对青岛市耕地地力进行评价,并以土壤养分丰缺指标、灌溉保证率、土壤物理状况作为限制性主导因子,对青岛市耕地进行改良利用分区。结果表明,青岛市耕地地力由高到低等级可划分为6级,其中一至四级地占总耕地面积的80%以上,说明青岛市耕地地力整体较好;改良利用分区结果显示,青岛市耕地可划分为土壤培肥、自然环境条件改善、土体整治等3种改良利用分区类型,不同分区类型耕地需采取有针对性的改良措施提高其产出水平。本研究可为青岛市进一步加强耕地质量建设、提高耕地资源的有效管理和改良利用提供参考。

Taking Qingdao City as the research area,with the support of geographic information system(GIS) and county cultivated land resources evaluation system, the index system of cultivated land fertility evaluation indexes was established. The comprehensive index(IFI) method and cumulative curve classification method were used to evaluate the cultivated land fertility, Using soil nutrient index, irrigation assurance and soil physical condition as the limiting factors, the amelioration regionalization of cultivated land in Qingdao City was carried out. The results showed that the fertility of cultivated land in Qingdao City could be divided into 6 grades from high to low,of which Grade 1 to Grade 4 accounted for more than 80% of the total cultivated land area and it indicated that the cultivated land was relatively better in whole. The results of amelioration regionalization showed that the cultivated land in Qingdao City could be divided into three types, such as soil fertilization,improvement of natural environment conditions and soil improvement, and specific improvement measures should be taken to improve the output level in different areas. This study provided a reference for further improve the quality of cultivated land and improving the effective management and utilization of cultivated land resources in Qingdao City.