断鞭对毛竹竹笋—幼竹高生长的影响

Effects of Cutting Rhizome on the Height Growth of Shoots and Seedlings of Phyllostachys edulis

为了解毛竹笋纵向生长的养分来源,分析来鞭、去鞭与竹笋成竹之间的内在关联,指导毛竹林土壤养分的合理补充。进行来鞭切断试验,结果显示:1)断鞭比不断鞭的日均高生长量下降了69.06%;2)竹笋去鞭提供给新竹枝下高生长的营养物质不超过53.5%,全竹高生长的不超过53.9%;3)新竹节间长度的长短与来鞭供给的营养物质有极显著关系,断鞭与不断鞭的平均短了53.2%;4)新竹胸径比对照减少了28.4%;5)断鞭比不断鞭的新竹平均地径与平均全竹高之间的尖削度1.73>对照的1.07。说明毛竹笋纵向生长的营养物质是由来鞭和去鞭共同提供的,而去鞭供给的营养物质不超过54%。

In order to understand the nutrient sources of the longitudinal growth of the shoots of Phyllostachys edulis, and to analyze the internal connection between the coming and going parts of rhizome with the stocking rate,and to guide the reasonable soil nutrient supplementation,a coming rhizome cutting test on the bamboo shoots was carried out. The results were reported as followings. 1）The average daily height growth of young bamboo whose rhizome had been cut decreased by 69.06%. 2）Less than 53.5% of nutri- ents in the process of under branch growth and less than 53.0%in the process of whole height growth of young bamboo were supplied by going rhizome. 3）Internode length of young bamboo had a close relation- ship with the nutrients which were supplied by coming rhizomes,and the average length of young bamboo whose rhizome had been cut reduced by 53.2%.4）Compared with the control,the DBH of young bamboo reduced by 28.4%. 5）The tapering grade of average ground diameter with average whole height of young bamboos was 1.73,higher than the control （1.07）. Therefore,the nutrient supply of new bamboo in the process of longitudinal growth was completed by coming bamboo and going bamboo rhizomes together, and the nutrient supplied by going rhizome was less than 54%.