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从植物叶子和花瓣表现的症状以及果树叶片高的含氟量,可以确定兰州市西固区果树大量落花落果与不结果现象是由于大气中氟污染造成的。试验表明大气中氟浓度的高低与果树落花落果率呈正相关关系。实验区内果树的落花落果率,以杏、枣最严重,冬果梨次之,青香蕉和印度苹果又次之,软儿梨能正常结果,显示不同种类和品种对氟化氢的危害具有不同的抗性。
From the symptoms of plant leaves and petals and the high fluoride content of fruit leaves, it can be determined that a large number of fallen fruit and fruitless fruits in Xigu District of Lanzhou City are caused by fluorine pollution in the atmosphere. The results showed that the concentration of fluoride in the air had a positive correlation with the fruit drop rate. In the experimental area, the fruit drop rate of fruit trees was the most serious with apricot and jujube, followed by winter fruit pears, followed by green banana fruit and Indian apple fruit, and soft fruit pears with normal results showed that different kinds and varieties had different resistance to hydrogen fluoride Sex.