蔬菜地土壤养分空间变异及其质量评价研究——以合肥市肥东县为例

Research on Quality Evaluation of Vegetable Field at County Scale:A Case Study of Feidong County, Hefei City

蔬菜地质量对蔬菜生长、产量、效益及农产品安全等具有重要意义。本研究以合肥市肥东县为例,根据蔬菜地自身特点,建立质量评价层次模型及隶属函数模型,对蔬菜地质量进行了评价。结果表明,该县蔬菜地等别面积呈正态分布,以2等~7等地面积居多、占全县蔬菜地总面积的80.42%,其中占比最多的为5等蔬菜地。该县蔬菜地整体土壤养分状况一般,有效磷和有效硫含量丰富,速效钾含量较丰富,有机质和碱解氮含量中等,且六种土壤养分空间变化趋势明显。1等~3等蔬菜地集中分布于该县中部及南部滨湖平原区、北部及东部部分乡镇也有分布,4等~7等蔬菜地分布相对均匀、但以中部地区居多,8等~10等蔬菜地主要分布于北部和东部地区;蔬菜地质量整体上呈由中南部向东北部变差的分布趋势。

The quality of vegetable fields is of great significance for vegetable growth,yield,benefits,and agricultural product safety.Taking Feidong County of Hefei as an example,this study established a quality evaluation hierarchy model and a membership function model based on the characteristics of vegetable fields to evaluate the soil quality of vegetable fields.The results showed that the vegetable fields of the county had a normal distribution,with 2 nd to 7 th grade fields accounting for 80.42%of the total vegetable fields in the county,of which 5 th grade fields was the largest.The overall soil nutrient status of the vegetable fields in the county is normal,with abundant available phosphorus and available sulfur content,rich available potassium content,medium organic matter and alkaline nitrogen content.The spatial change trend of six soil nutrients is obvious.The 1 st to 3 rd grade vegetable fields are concentrated in the central and southern lakefront plains,northern and eastern parts of towns and villages.The 4 th to 7 th grade vegetable field’s distribution is relatively uniform,but mainly in the central region.The 8 th to 10 th grade vegetable fields are mainly distributed in the northern and eastern regions.The overall quality of vegetable fields shows a trend of deterioration from the central south to the northeast.