割制和乙烯利刺激强度对无性系PR107胶乳蔗糖和还原糖的影响

s/4·d/2、s/3·d/2和s/2·d/2三种割制对胶树乳管的蔗糖供应和转化方面的影响基本相同;s/1·d/2全螺旋隔日割制胶乳的蔗糖含量较低,而还原糖含量较高,表明乳管的蔗糖供应不足和己糖代谢缓慢。乙烯利刺激对无性系PR107胶乳糖分的影响主要取决于割线长度,其糖分增加程度随乙烯利剂量而导,采用短割线s/4·d/2割制+乙烯利对改善胶树供应乳管的蔗糖效应最好。长期用s/2·d/2+25毫克CEPA割胶,乳管蔗糖供应日趋不足。

橡胶无性系PR107产胶潜力的研究

连续八年(1978～1985年)乙烯利刺激割胶制度试验的结果表明,PR107是一个产胶潜力较大且耐刺激割胶的优良品系。采用适宜的刺激割胶方法,可以持续增产,而且副作用不明显,生理参数也反应良好。该品系的刺激产量、堵塞指数、干胶含量、长流胶、死皮率,树围生长量以及树皮中淀粉含量等都与刺激浓度、刺激周期的长短、以及割胶强度密切相关。当年停割前一个月的干胶含量与翌年开割后第一个月的干胶含量呈极显著正相关,因此,停割前一个月应停止刺激,以利于提高干胶含量。

PR107阴阳线割胶制度试验总结

1983—1988年对28578.9亩共599766株PR107胶树采用(s/4↑+s/4)d/3,12d/15+ET4%(或3％),Pa2(2)12/y(m/2),60—65t/y割制采胶。试验结果表明,大面积示范区5年平均干胶产量比对照(常规割胶)的增产27.3～30.9%;死皮发病率较对照低;干胶含量平均为29.2～29.77％,比对照的低3,39～3.69%; 5年平均每亩年盈利84.29元(统计1272.1亩)。

Effects of Micro-tapping with Different Concentration of Ethylene on Yield and Physiological Features of Rubber Tree(Hevea brasiliensis) Clone PR107

In this study, the rubber tree clone PR107 was selected as test material,and its yields and physiological features under micro-tapping with different concentrations of ethylene were compared. The results showed that there was no significant correlation between rubber yield and ethylene concentration applied by microtapping on PR107. Too high level of ethylene was not conducive to improvement of rubber yield. When the ethylene concentration for micro-tapping was higher than60%, physical deficiencies appeared in rubber tree PR107, the dry rubber content was reduced, and the yield was unstable. Instead, when the ethylene concentration was lower than 40%, the physiological features of PR107 were steady, the dry rubber content was stable, and the yield was relatively high.