Impacts of typhoon storm on farmland ecological environments in the eastern coastal area of Zhejiang Province and their countermeasures

The impacts of the typhoon storm incurred by No.11 typhoon in 1997 on the farmland ecological environments in the eastern coastal area of Zhejiang Province were studied.The results indicate that the salt content of the soils as well as the irrigated water within the agroecological systems immersed by sea water increases by a big margin.Particularly,the salt content of surface soils immersed for 72 hours and more than 72 hours reached 1.27% and 1.38% respectively,and those of irrigated water on surface layer,and at the depths of 3m,6m,and 10m beneath surface after flooding for 8 days reached 2.36‰,3.22‰,3.84‰ and 4.03‰ respectively.Even after the flooding receded,the salt content of irrigated water still stands around 2.26‰.Therefore,both the flooded soils and irrigated water are no longer applicable to agricultural uses if no improvement measures are undertaken.To reduce the impacts of the typhoon storm and resume the normal agricultrual production,the remedial countermeasures,such as removing dried crop stems,deep digging and tillage,proper structure of crop varieties and suitable cultivation and management measures,are proposed for rehabilitating the impacted agroecological environments.