The collapse mainly occurs in the low - water years or during the beginning of the dry season and rain season in a year.
塌陷主要分布在松散层较薄的第四系覆盖区，发生时间主要集中于枯水年份或年内枯水期和丰水期初。
2
According to the shallow mountain, the characteristics of lowwater content, choosing afforestation season planting is given priority to with spring, winter, rainy season.
根据山区土层浅薄，含水量低的特点，造林季节选择以春季、冬季、雨季造林为主。
3
Spring and fall, tidal water level is low, are a good crab catching season.