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以公乌素引洪灌区为研究区域,对公乌素引洪淤地工程改良土壤肥力进行综合评价,确定引洪灌区不同淤积部位耕地地力等级。采用层次分析法确定各指标权重(运用Excle计算,简化了传统的计算模式),使得权重区分度更加明显;应用AHP-模糊综合评价方法,结合不同淤地部位的土壤剖面样品分析,得到有机质、碱解氮、速效磷、有效钾、全氮、全磷、全钾等理化性质指标,并对其进行综合评价。评价结果表明:未经过高含沙洪水淤地(风沙地)土壤肥力指数较低,为0.258 6,经过一次淤地的土壤(新淤地)上游段为0.540 3,中游段为0.383 4,下游段为0.387 8;根据耕地地力等级的划分,确定风沙地属Ⅳ级,新淤地的中游和下游属Ⅳ级,新淤地上游属Ⅲ级。
Taking the flood irrigation area of Kushibu as the research area, the comprehensive evaluation of the soil fertility improvement in the flood diversion project was carried out to determine the grade of cultivated land productivity in different silting sites in the flood diversion irrigation area. Analytic hierarchy process (AHP) method was used to determine the weight of each index (using Excle calculation and simplified the traditional calculation mode), so that the discrimination of weights was more obvious. By using AHP-fuzzy comprehensive evaluation method and analyzing soil profile samples from different silting sites, Alkaline nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium and other physical and chemical properties of indicators, and its comprehensive evaluation. The evaluation results show that the index of soil fertility is 0.258 6 before silting land with high sediment concentration (silt sandy land), 0.540 3 in the upper reaches of silt land (once silted upland) and 0.383 4 in the middle reaches According to the division of cultivated land level, it is determined that the sandstorm belongs to grade Ⅳ, the middle and downstream of the new silt belongs to grade Ⅳ, and the upper reaches of new silt belong to grade Ⅲ.