火炬松、湿地松和马尾松采穗圃营建技术

通过不同剪顶时间和剪顶高度对火炬松、湿地松和马尾松的萌条数量、长度和径粗的影响研究 .结果表明 :不同树种由于其生物学特性不同 ,适宜的截顶时间、截顶高度表现不一致 .火炬松适宜的截顶时间为 8月 2 0日至 8月 2 5日 ,截顶高度以 1 5cm为最宜 ;马尾松适宜的截顶时间为 7月 3 0日 ,截顶高度为 8cm;湿地松适宜的截顶时间为 8月 1 5日至 8月 2 0日 ,截顶高度为 1 5cm.

Building Techniques of Cuttings Orchard of Pinus taeda,Pinus elliottii and Pinus massoniana

In this paper,the effect of time and retention height of topping on quantity,length and basal diameter of coppice shoot of Pinus taeda,Pinus elliottii and Pinus massoniana has been studied The results showed that because of difference of biological properties among three tree species, suitable time and retention height of topping among three tree species are different The suitable topping time of Pinus taeda is August 20 to August 25,the best retention height of topping is 15 cm; The suitable topping time of Pinus massoniana is July 30, the best retention height of topping is 8 cm; The suitable topping time of Pinus elliottii is August 15 to August 20,the best retention height of topping is 15 cm