非生产期内不同橡胶苗生长比较研究

为了研究非生产期内不同砧木类型橡胶苗对橡胶树茎围生长和可开割率的影响，利用从同一批次苗木中按砧木大小及其胶乳分级后选出的4种袋装苗和籽苗芽接苗（袋装苗），进行大田非生产期内的生长比较研究。结果表明：在定植时5种袋装苗之间的接穗直径存在显著差异，至开割前各种苗木茎围差异不显著，小苗和随机苗具有相对较快的茎围增长速率；定植7年后随机苗的可开割率最低，但达到开割标准；所有苗木的茎围生长呈现出规律性的增长，均拟合同一线性方程。说明对橡胶苗木进行分级后定植，有利于提高橡胶树的可开割率，非生产期内橡胶幼树的茎围生长呈线性增长。

A Comparative Study on the Different Budling of Hevea brasiliensis in the Immature Period

In order to study the effect of buddlings with different rootstocks on girth growth and tapping tree percentage, the growth of four kinds of polybag plants classed and selected from the batch of budlings and mini-seedling budling (polybag plant) according to rootstock size and its latex in the immature period were investigated in this study. The results showed that: there were significantly different among the scion diameter of five sorts of polybag plants when those were planted and no significantly different before tapped. The girth growth rate of small and unselected polybag plants was relative quick. The tapping tree percentage of unselected polybag plants was the lowest among five budlings planted seven years ago, and it reached the standard for open tapping. The girth growth of all the budlings increased regularly and fitted the same linear equation. Those indicated that classing and selecting of the budling of Hevea brasiliensis before planted was beneficial to enhance of the tapping tree percentage and girth growth of young rubber tree showed linear increase.