人工马尾松复层混交林林分结构规律的研究

From the analysis and simulated study on the stand structures of present the multi\|stories mixed uneven\|aged Pinus massoniana planted forests in Fujian, the correlationships between stand diameter distribution structure,stand stock distribution structure, tree height and DBH were obtained. Several proposals for the rational management and structure adjustment of the present forests were put forward.

扬州古运河风光带生态景观型林地模式的环境效应

Studies in the environment effectof economical landscape forest modelalong the Grand Canal in Yangzhou Thetest showed that Noises in the afforestedregion were decreased by 3-10dBcomparisons with non-afforested region.Leafy, hardness and overlapping rangingtrees are better than others. The shortbranches forest coronet trees such as Sabinachinensis cv.Kaizuka, Ligustrum lucidumAit et.are better apparently effect ondecreasing noises than.highers.Theillumination distribution at differentaltitude was gradually decreasing fromabove forests coronet to forest earth.

封山育林的生态效益和经济效益

封山育林是利用自然力繁殖森林和扩大森林资源的最经济的手段,是“顺天时,量地力”、综合治理荒山和水土流失的好途径,也是加速林业发展的有效措施。它能极大限度地发挥森林的经济效益和生态效益,多快好省地恢复森林生态平衡。生态效益 1.改善林分结构,丰富自然群落,充分利用光能。封山后,往往形成针阔叶、落叶与常绿、乔木与灌木混交的复层林分,构成分层利用的多维空间,充分有效地利用水、光、热能和地力。据测定。

巨桉乳源木莲复合林经营模式研究

研究桉树7年生林经间伐后,在桉树林下套种乳源木莲的经营方式,结果表明:桉树林经间伐套种乳源木莲(JR)处理比同样间伐但不套种(JA)处理和不间伐不套种(CK)处理的桉树胸径生长量分别提高了7.46%和71.84%,树高生长量分别提高了5.32%和81.45%,单株立木材积分别提高了9.10%和150.87%;在桉树林下套种的乳源木莲(5年生)平均树高、平均胸径分别达到5.8 m和5.4 cm,与同年度相似立地条件下的乳源木莲纯林和乳源木莲、杉木乳源木莲混交林两个处理相比,平均树高分别增加了41.46%和9.43%;平均胸径比乳源木莲纯林提高了54.29%,但比混交林降低了5.27%。说明在桉树林下套种乳源木莲经营方式可行,能够形成异龄复层林分,有利于培育桉树大径材。