听听绿叶的声音

听听绿叶的声音来自树林的最平凡的声音白桦林里的阵阵掌声红松林里的滚滚涛声听听绿听的声音来自自然的最补素的声音白天她拔动阳光的金弦夜晚她荡起明月的涟漪听听绿叶的声音来自大地的最纯粹的声音岁月对于欢乐的渴望沧桑对于坎坷的收获听听绿叶的声音来自生命的最动人的声音春风起时她的欣喜秋风起时她的羞涩听听绿叶的声音来自心灵的最圣洁的声音青春是她的音符拼搏是她的旋律听听绿叶的声音@白河     

经济发达国家是如何应对森林火灾的

火灾是我们人类所面临的最大的敌人.他的发生不仅毁坏了我们的家园、给人民生民的生命和财产的安全带来严重的危害.更重要的是他严重地破坏了我们所生存的自然环境的自身的平衡,直接危害到我们赖以生存的地球的安全.因此预防火灾的发生、有效的控制火灾的危害,把损失降到最低是全世界的人们极为关心的问题.文章给我们介绍了世界上经济较发达...     

绿色诗签(二首)

酷爱绿色的民族必须擎起千年的胡杨枝才能写好你的名宇水涨水落草枯又生你对树情有独钟钻天杨般伟岸的身躯那是家园不倒的旗帜松根般有力的足趾深深扎进沙地以白桦的俊美雕刻自己的面容抡起破土镘掘出坎尔井于是,就有绿色的篱笆墙有了青藤缠绕的小屋有了葡萄般明亮的眸子有了柳枝般飘动的发辫有了风摆杨柳般清洒的舞姿不信？请到这里来作客迎接你的首先是一片清凉的绿荫植树节感怀掀开三月十二日这张日历就掀动了绿色的春潮于是,我们就亮起绿色的眼睛滴下的雨,是绿色的飞过的云,是绿色的连天上的太阳也是绿色的我们放飞一组绿色的音符寄…     

松干蚧的普查方法

“指挥员的正确的部署来源于正确的决心,正确的决心来源于正确的判断,正确的判断来源于周到的和必要的侦察和对于各种侦察材料的联贯起来的思索。”“作几次周密的     

以诗歌和绿色的名义

以怀古的心情怀念远祖的村庄试想用怎样的方式增大心脏的容量完成此生唯美的收藏把一棵树理解为成材的过程是荒唐的任何生长都有自己固执的走向把一朵花想象成爱意的装潢是荒唐的季节的表情产生于深处的独想借用一抷黑土酿制粮食的纯度借用一粒飞沙击打流浪的行程借用一叶秋愁压弯临冬的脊梁草茎与林木的风湿已深入膝踝和每一处骨节疼痛的长夜折磨事物无辜的睡床盘点库存还有多少骄傲的资本参加未来的邀请生态脆弱着已无力承载疯狂的放纵和铺张折下嫩绿的枝条就是折断春天的手指呵拘捕翠鸟的翅膀就是拘捕自由的歌唱呵开垦草原砍伐森林就是砍…     

河北漳河林场洋槐林地位级曲线

地位级是反映一定树种的立地条件的好坏和林分生产力的指标。地位级的优劣是以一定年龄的林分的平均树高的差异划分的,这种划分方法主要应用于树种单纯的同龄林。在森林经营工作中,对于立地条件的调查以及地位级的划分具有十分重要的意义,因为只有对森林生长的立地质量有一个清楚的了解,才有可能采取一定的营林措施改善立地条件,提高林分的生产力;同时,由于生长在不同立地上的林     

关注《绿色大世界》

《绿色大世界》杂志是一个呼唤绿色的信使,翻开它,便犹如置身一个绿的海洋,使我们暂时忘掉了冰冷的钢筋、竖硬的水泥,忆起了荫翳的树木遍地的花草;远离了震耳的轰鸣尖锐的汽笛,靠近了呢喃的燕语婉转的莺啼;拂去了扑鼻的烟尘车尾的废气,迎来了带叶的朝露沁人的馨香,给疲惫已久的身心一片清凉。     

梨树的管理技术

梨树是我国的主要经济果树，要提高梨树的产量，梨树的管理至关重要。梨树的高产关键字各个季节的管理，春节的花期、夏季的病虫害、秋季的果园清理和冬季的修剪在梨树的整个生长期都需要精心的管理，“一分耕耘一分收获”。     

中国园林发展方向之我见

白雪皑皑的白山黑水,椰林高耸的南海琼崖,西北边疆的天出雪峰,锦秀江南的鱼米之乡,林海起伏的大兴安岭,水波粼粼的五百里滇池,一望无际的内蒙古大草原,四季鲜花的西双版纳;雄伟的泰山,奇险的华山,铁骨冰肌的黄山,秀逸飘然的武夷     

良好的常规是提高幼儿绘画水平的前提

绘画水平的提高离不开良好的常规的建立,良好常规的建立能引发幼儿与周围环境相互作用,进一步促进孩子们的动手能力的发展。在良好常规的建立中孩子们的倾听习惯的养成起着很重要的作用。在孩子们作画习惯和整理工具等方面的培养同样的是需要良好常规的支撑。     

Abundance and use of cavity trees at the tree- and stand-levels in natural and plantation forests in Hokkaido, Japan

The conservation of cavity trees in plantations is important for maintaining biodiversity because cavity trees are one of the forest attributes most strongly affected by forestry operations. We surveyed the occurrence of cavities at the tree-level and the abundance of cavity trees and the number of uses by secondary cavity users at the stand-level in natural and conifer plantation forests in Hokkaido, Japan. We classified cavities into two types by their formation processes: excavated and non-excavated. Excavated cavities were more common in dead trees than in live trees. Non-excavated cavities showed high occurrence in dead and live broad-leaved trees. The abundance of non-excavated cavity trees was two times greater than that of excavated cavity trees in natural forests, but, in plantations, excavated cavity trees were dominant. The abundance of non-excavated cavity trees was lower in thinned plantations than in not-thinned plantations. The number of cavity uses increased with the number of cavity trees, indicating the importance of maintaining cavity trees. Conifer plantations are established by removing native broad-leaved trees, which results in a lower abundance of non-excavated cavity trees in these locations. The conservation of broad-leaved trees is important for maintaining the current and future resource of non-excavated cavity trees in plantation forests, as is the conservation of dead trees, which showed a high occurrence of excavated cavities.     

南昌园林彩叶树种种类与应用

通过系统调查查明南昌彩叶树种共有114种,主要分为春色叶、秋色叶、常色叶、双面叶、斑色叶5类。探讨它们在南昌市区的主要应用形式。     

河南省古树名木资源调查分析

采用实地现场调查为主,结合访问当地群众的方法,以县(市、区)为单位,对河南省的古树名木进行了逐株普查.结果表明:河南省古树名木分布范围广,各市种类数和株数有较大差异.全省古树共计528457株,名木211株,古树群617个,其中,散生古树29917株,隶属61科、147属、236种,树龄为100～299a、300～49...     

慈溪市古树名木资源现状与保护对策

根据2011年古树名木调查结果,慈溪市现有各级古树名木259株,其中一级(树龄500 a以上)保护古树9株,二级(树龄300～<500 a)保护古树15株,三级(树龄100～<300 a)保护古树235株;指出了保护意识不高、资金不足、管护责任不明确、保护措施不够到位等问题;提出了提高保护意识、落实专项管护资金、明确管护责任、健全古树名木档案、加强古树名木后备资源保护的对策。     

福州市古树名木资源的保护与利用

通过对福州市现有古树名木分析,总结了5大特点并结合多年的古树保护经验,探讨了福州市古树景观保护和利用问题。古树景观开发应在保护好古树的前提下进行。古树景观利用切忌异地移植,重点是解救散落于民居中或饱受围困的古树,通过改良环境和复壮,再造宜人景观。文章还涉及古树景观的设计原则、价值评测、指标体系和枯树景观利用以及物种竞争、开发与保护的矛盾等问题。     

长沙市古树名木资源及其保护对策

据调查,长沙市建档树龄100年以上的古树名木1265株,分属34科54属69种。其中一级古树23株,二级古树51株,三级古树1191株,属最多的科是蝶形花科,有4属。种最多的科是壳斗科,有6种。株数最多的树种是香樟,有438株,其次是枫香,有250株,两者累计占全市古树名木总株数的54.39%。资源最多的是岳麓区,有714株,占全市总株数长沙市古树名木资源及其保护对策的56.44%。利用MAPINFO PROFESSIONAL地理信息系统软件为平台,建立了长沙市古树名木资源动态管理系统,为古树名木的保护奠定了基础。针对存在的问题,提出了全市古树名木的保护对策。       

温州市区古树名木资源现状和管护措施探讨

据2008年调查统计,温州市区现存古树名木856株,隶属28科、31属、32种。其中,国家一级古树名木38株,二级古树名木104株,三级古树名木714株。分析了古树名木现状与存在的问题,提出了针对性的管护措施。     

观花乔木树种在沈阳街路推广与应用

通过对沈阳市街路栽植的观花乔木的现状分析,确定了观花乔木的引种与筛选原则,对初选出的近30种观花乔木进行了各种观测试验。基本摸清了这些观花乔木的生物学特性和生态习性;通过应用栽培试验,筛选出栾树、香花槐、红肉苹果、暴马丁香等26种优良观花乔木树种;列出了适合沈阳街路栽植的观花乔木树种名录并进行了推荐。     

余姚市古树名木资源变化原因分析及保护策略

为更好地保护和利用古树名木,对余姚市古树名木资源10年来的变化情况进行了调查分析。10年内,古树个体数量新增80株,减少47株,净增33株,两次调查均无名木,主要表现为古树在农村区域增加,在城市区域减少。树龄进界是古树数量增加的主要原因,而自然灾害则是造成古树减少的主要原因。基于此,对余姚地区古树名木的保护提出了建议。     

Mechanisms of drought response in Thuja occidentalis L. II. Post-conditioning water stress and stress relief

We examined the extent of osmotic adjustment and the changes in relative water content (RWC) and transpiration rate (i.e., relative stomatal function) that occur in water-deficit-conditioned 6-year-old Thuja occidentalis L. (eastern white cedar) trees in response to a severe drought. Trees conditioned by successive cycles of mild or moderate nonlethal water stress (conditioning) and nonconditioned trees were exposed to drought (i.e., -2.0 MPa predawn water potential) to determine if water deficit conditioning enhanced tolerance to further drought stress. Following drought, all trees were well watered for 11 days to evaluate how quickly osmotic potential, RWC and transpiration rate returned to preconditioning values. Both nonconditioned trees and mildly conditioned trees exhibited similar responses to drought, whereas moderately conditioned trees maintained higher water potentials and transpiration rates were 38% lower. Both conditioned and nonconditioned trees exhibited a similar degree of osmotic adjustment (-0.39 MPa) in response to drought relative to the well-watered control trees. The well-watered control trees, nonconditioned trees and mildly conditioned trees had similar leaf RWCs that were about 3% lower than those of the moderately conditioned trees. Following the 11-day stress relief, there were no significant differences in osmotic potential between the well-watered control trees and any of the drought-treated trees. Daily transpiration rates and water potential integrals (WPI) of all drought-treated trees approached those of the well-watered control trees during the stress relief period. However, the relationship between cumulative transpiration and WPI showed that previous exposure to drought stress reduced transpiration rates. Leaf RWC of the moderately conditioned trees remained slightly higher than that of the nonconditioned and mildly conditioned trees.