1) pine-sweet gum mixed forest
马尾松枫香林
1.
The results indicated that:(1) the difference of species composition between the two forest types was significant; (2) in pine-sweet gum mixed forest,the pine population was a cohort aged from 25 to 30 years,which could be taken as a maturing population,while the sweet gum population could be viewed as an increasing population.
长江中下游低山丘陵地区是一个植被曾经受到破坏的生态脆弱区,枫香林和马尾松枫香林是该地区的重要植被类型,对于维持该地区的生态安全具有重要意义。
3) Pinus massoniana forest
马尾松林
1.
Successional dynamics of Pinus massoniana forest in Lijiang River watershed,Guilin;
桂林漓江流域马尾松林演替动态
2.
Based on a field investigation, the early recovery vegetation characteristics of Pinus massoniana forest, Cunninghamia lanceolata forest and evergreen broad-leaved forest, which had been burned severely one year before, in Maoan Forestry Centre of Chongqing were analyzed.
通过对重庆市北碚区茅庵林场马尾松林,杉木林和常绿阔叶林3种群落火烧1年后的迹地以及未火烧林地的群落学调查,研究了高强度火干扰后不同群落早期恢复植被特征。
3.
Height, diameter at breast height(DBH) and canopy width(CW) of 17 broadleaved tree species in degraded Pinus massoniana forest from lianhua mountain Nature Reserve of Dongguan city, were measured and analyzed.
对东莞莲花山自然保护区退化马尾松林林分2002年种植的17个3年生阔叶树种的树高、胸径以及冠幅进行测量和分析。
4) masson pine forest
马尾松林
1.
The distribution of Masson Pine forest is very wide in the upper ana middle reaches of Yangtse River.
长江中上游地区马尾松林的分布非常广泛。
5) Pinus massoniana
马尾松林
1.
Eco-hydrological Effect of Pinus massoniana Canopy and Its Influence Factors in Zhangjiajie of Hunan Province;
湖南省张家界马尾松林冠生态水文效应及其影响因素分析
2.
Study of Hydfological Characters and Movement of Mineral Elements of Pinus massoniana Forest Watershed;
马尾松林水文特征及其矿质元素迁移研究
3.
pubescens, Pinus massoniana stand and tea garden were analyzed.
通过对马尾松林、茶园和毛竹林土壤酶活性的研究表明:3种群落间,毛竹林的过氧化氢酶活性大于马尾松林、茶园(P<0。
6) Pinus massonian woodland
马尾松林地
1.
In the red soil area of southern China,because of erosion and degeneration of Pinus massonian woodland,extremely leanness of soil and large degeneration area,it is difficult to recover ecology of degenerated Pinus massonian woodland.
我国南方红壤区严重侵蚀退化马尾松林地土壤极度贫瘠,加之退化面积广等因素,导致其恢复的难度加大,如何恢复侵蚀退化马尾松林地成为当前面临的一个艰巨而又迫切的任务,因此加快相关方面的研究和治理,探讨其退化机理,解决生态恢复关键技术,对于推动红壤区的生态建设具有重要意义。
补充资料：松香
| 松香 rosin 松树的含油树脂经加工除去松节油后的热熔物。常温下为固体，主要成分为树脂酸，外观随原料和加工方法而异，通常呈淡黄至黄红色，有时呈暗红色至近黑色。性硬脆，易碎裂，断面有光泽。松香具有防潮、绝缘、乳化、粘合、防腐等作用，广泛用于造纸、医药、橡胶、电缆胶粘制、肥皂、口香糖等工业部门。1995年中国产40多万吨，占世界总产量的1／3，出口20多万吨，占世界总贸易的一半，年创汇1亿多美元。松香按原料来源分脂松香、木松香（或称浸提松香）和浮油松香；按加工深度分为天然松香、改性松香和松香衍生物。松香中的树脂酸约占90％，其余均为脂肪酸和不皂化物。松香溶于乙醇、乙醚、丙酮、苯和松节油等，不溶于水。密度1.070～1.085克／厘米3，软化点68～82℃。燃烧时发生大量黑烟。雾状粉尘的着火点为130℃， 与空气混合爆炸下限12.6克／米3，易自动氧化，氧化后生成氧化树脂酸使松香颜色加深。有些松香具有易结晶的趋势，结晶松香熔点高（110～135℃），难于皂化，品质降低。松香的化学性质取决于树脂酸分子结构中的双键和羧基反应。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条