雷竹保护地栽培林分立竹结构的初步研究

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。

Preliminary study on composition of Lei bamboo in protected plot

Data collected from 44 Lei bamboo plots produced an average density of 1 7000 stalks per hectare and a variance coefficient of 31 1% There is a large variation in density between each plot thus the high variance coefficient A plantation is mulched in order to increase the soil temperature An increase in the mulching frequency produces a higher flowering potential which is detrimental to a plantations productivity Plantations that are mulched for three consecutive years or longer have a more than 11% flowering rate It is suggested to mulch for two consecutive years then allow the plantation to lay dormant for one year Thereafter the mulching cycle is repeated This mulching technique is performed in order to maintain a healthy composition of rhizomes,a variety of age classes The goal of a productive bamboo plantation is to have a density of approximately 16 500 stalks per hectare