Abstract: The evaluation of the ecological suitability of agricultural land can clarify the constraints of agricultural land production and ecological function, which is conducive to targeted zoning and classified policies, so as to improve the sustainable use level of regional agricultural land. Taking Huanghua City in the Bohai Rim region as an example, this paper constructs an evaluation index system of ecological suitability of “soil resourceswater resources” composite farmland, and uses the method of combining single index evaluation and hierarchical evaluation to identify the limiting factors and degree of ecological suitability of agricultural land. Based on the results of the comprehensive evaluation, according to the principle of consistency of improvement technical measures, the agricultural land consolidation zones were divided, and the improvement measures were put forward accordingly. The results showed that the ecological suitability of chemical fertilizer application rate, organic matter content and soil salt content of agricultural land in the study area was poor, and the unsuitable grades reached 87.47%, 99.62% and 25.34%, respectively. The groundwater mineralization of agricultural land in the whole area was too high, the groundwater depth in the eastern part was shallow, and the irrigation guarantee rate of 69.54% of agricultural land was insufficient. In addition, other indicators were in an appropriate state. The main limiting factors of agricultural land in the study area were as follows: chemical fertilizer application rate, organic matter content, soil salinity content, groundwater salinity, groundwater burial depth and irrigation guarantee rate. The combination of limiting factors was divided into two categories such as the composite type of “dominant limiting factor (severe) + secondary limiting factor (mild)” and the single type with only mild limiting factors, accounting for 91.9% and 8.1%, respectively. Two types of remediation areas were divided into “soil fertilization area” and “saline soil improvement area”, and the targeted remediation and improvement measures were put forward. The results of this study can provide a practical reference for the improvement and utilization of agricultural land in coastal areas with complex ecosystem conditions.

Key words: Huanghua City, agricultural land, ecological suitability, limiting factors, regulation zoning

摘要： 开展农用地生态适宜性评价可厘清农用地生产和生态功能限制因素，有利于有针对性地分区开展整治并分类施策，进而提高区域农用地的可持续利用水平。以环渤海区域的黄骅市为例，构建“土壤资源—水资源”复合农田生态适宜性评价指标体系，运用单指标评价与分层次评价相结合的方法，识别农用地生态适宜性的限制因素及程度；综合评价结果，并按照改良技术措施一致性原则，划分农用地整治分区，对应提出改良措施。结果表明：研究区农用地化肥施用量、有机质含量、土壤含盐量生态适宜性较差，不适宜级分别达到87.47%、99.62%和25.34%；全域农用地地下水矿化度过高，东部地下水埋深浅，69.54%农用地灌溉保证率不足；此外，其他指标呈适宜状态；研究区农用地主要限制因素为：化肥施用量、有机质含量、土壤含盐量、地下水矿化度、地下水埋深及灌溉保证率；限制因素组合类型分为两类：“主导限制因素（重度）+次要限制因素（轻度）”的复合类型、仅有轻度限制因素的单一类型，二者占比分别为91.9%、8.1%；划分“土壤培肥区”“盐渍化土改良区”两类整治区，并有针对性地提出整治提升措施。为生态系统状况复杂的滨海区农用地改良和整治利用提供实践参考。

关键词: 黄骅市, 农用地, 生态适宜性, 限制因素, 整治分区