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在浙江省临安市高虹镇、东天目乡调查的４４个样地材料表明：竹林的平均立竹度为１．７万株·ｈｍ－２，变异系数为３１．１％，各样地间立竹度变异极大；连续实施覆盖栽培时间越长，竹林开花越严重，覆盖３ａ或３ａ以上竹林高达１１％的立竹开花。为使覆盖栽培竹林具有良好的竹林结构，保持雷竹的持续丰产，应采用２ａ覆盖１ａ休闲的方法留养母竹，覆盖年份少留养，休闲年份多留养，并使雷竹立竹度保持在１．６５万株·ｈｍ－２左右。
The data of 44 sample plots surveyed in Gaohong Town and Dongtianmu Township, Lin’an City, Zhejiang Province showed that the average bamboo stand was 17000 hm-2 and the coefficient of variation was 31.1% The variation of standing bamboo was extremely variable. The longer the continuous cultivation, the more serious the flowering was. The bamboo that covered bamboo above 3a or 3a was up to 11%. In order to make the bamboo plantations with good bamboo structure and maintain the high yield of Thunbergii, the method of 2a leisure should be adopted to keep the parent bamboo, covering less years of stay and keeping more in leisure years, 16,500 plants · hm-2 or so.