论文部分内容阅读
上海地区每年夏秋间易受台风的威胁和影响。春、夏、秋三季还常有低气压、干热风及雷阵雨带来的强风,往往使果树枝折树倒,柱头吹焦,果、叶吹落;有时还由于随大风而来的暴雨造成果园积水死树;另外,冬季寒潮南下时也常有8～9级的西北大风,对柑桔的安全越冬带来巨大的威胁,给果树生产造成极大的危害。上海地区可根据具体情况采用以下各种措施:
In summer and autumn, Shanghai is susceptible to typhoon every year. Spring, summer and autumn often have low pressure in the three seasons, dry and hot winds and thunderstorms bring strong winds, often make the tree branches fall trees, stigma blowing coke, fruit, leaves blown off; sometimes due to heavy winds with the wind caused the orchard plot Water dead trees; In addition, the winter coldness often southwest often 8 to 9 of the northwest wind, the safety of citrus overwinter bring a huge threat to the production of fruit trees caused great harm. Shanghai area according to the specific circumstances of the following kinds of measures: