上海市某郊区绿色生产模式土壤质量状况评价

为准确掌握绿色生产模式下粮田土壤的肥力和污染情况,该文通过2020年至2022年连续3年对上海市某郊区11个街镇50个水稻田点位共计150个土壤样品进行跟踪监测,分析土壤主要养分及重金属含量。监测结果表明,这3年来大部分街镇土壤肥力维持在Ⅰ级,2个街镇从Ⅱ级、Ⅲ级提升到Ⅰ级,土壤重金属污染指数均小于1,无重金属污染。通过减少化肥使用量,施用有机肥和生物菌肥等绿色生产模式,并未降低土壤肥力,符合绿色食品产地环境质量标准,无污染,确保绿色食品的可持续发展。

In order to accurately grasp the soil fertility and pollution of grain fields under the green production mode,150 soil samples from 50 paddy fields in 11 streets and towns in a suburb of Shanghai were tracked and monitored for 3 consecutive years from 2020 to 2022.The contents of main soil nutrients and heavy metals were analyzed.The monitoring results show that in the past three years,the soil fertility of most streets and towns has been maintained at grade I,and two streets and towns have been upgraded from gradeⅡand gradeⅢto grade I.the soil heavy metal pollution index is less than 1,and there is no heavy metal pollution.By reducing the use of chemical fertilizer,the application of organic fertilizer and biological bacterial fertilizer and other green production models,did not reduce soil fertility,in line with the environmental quality standards of green food producing areas,no pollution,to ensure the sustainable development of green food.