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...     

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…     

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…     

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     

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。     

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”。     

余姚地区松幽天牛发生情况及其在枯死马尾松根部分布规律的初步研究

调查了松幽天牛(Asemum amurense)在余姚地区的发生情况及其幼虫在枯死松树根内的分布规律。结果表明,松幽天牛在余姚地区1年发生1代,以幼虫在松树根内越冬。4月中旬开始化蛹,5月中旬成虫开始羽化,6月上旬成虫开始产卵,7月下旬卵开始孵化。松幽天牛在余姚地区的平均危害率达42.9%,其发生与土壤理化性质密切相关。松幽天牛幼虫在主、侧根内的分布数量差异显著,主根内的幼虫数显著多于侧根内。还依据松幽天牛的生活学特性提出了松幽天牛的防治措施     

俄罗斯联邦的森林资源及其特性

俄罗斯联邦森林资源极为丰富,在世界上占有重要地位,其森林资源本身具有地域分布的不均匀性、变动的相对稳定性、针叶树种及成过熟林蓄积的优势性十分明显。这些特点为中俄林业合作开发亚洲地区的森林资源奠定了良好的物质基础。     

蜡杨梅砧木嫁接的晚稻杨梅盐碱地栽培试验

用2种不同砧木嫁接晚稻杨梅种植于盐碱地和酸性土壤中,进行杨梅栽培试验.结果表明,两种土壤中的营养元素除速效钾盐碱土高于酸性土外,其它均低于酸性土,但两种土壤上的杨梅叶片元素含量有所不同,大量元素盐碱土稍低于酸性土,而微量元素除Cu相同外其它均高于酸性土;本接杨梅种植在盐碱地上与蜡杨梅作砧木嫁接杨梅生长相比较,本接杨梅树...     

Effects of nutrition spatial heterogeneity on root traits and carbon usage by roots of Cercis chinensis seedlings in split root rooms

In natural ecosystems, nutrition available for plants shows great spatial heterogeneity. Much is known about plant root responses to the spatial heterogeneity of nutrition, but little is known about carbon usage in roots in nutrition-deficient patches and its effect on root longevity. In this study, split-room boxes were used for culture of Cercis chinensis seedlings, and the small rooms were supplied with different nutrition levels. The number of the first-order roots in the rooms with nutrition supply was significantly higher than that in the rooms with deficient nutrition. Specific root length (SRL) of the first-order roots in the rooms with deficient nutrition reached its peak at day 64 after nutrition treatment. There was no significant SRL differences between the two order roots during the experiment. Biomass of the first-order roots in the rooms without nutrition supply was significantly less than that of the first-order roots in the rooms with nutrition supply from day 64 to 96. The total biomass of the lateral roots in the rooms without nu-trition supply decreased from day 64 to 96. The activities of the enzymes in roots in the rooms without nutrition supply increased and the activities of alkaline invertases in roots in the two sides of split box did not change significantly. The activities of the enzymes in roots in the rooms without nutrition supply increased gradually. These results suggest that nutrition spatial heterogeneity induced the changes in root traits and plants actively controlled carbon usage in roots in nutrition-deficient patches by regulating the activities of invertases and sucrose synthases, resulting in the reduction in carbon usage in the roots in nutrition-deficient patches.     

全国杉木家系区域试验研究

湖南省林科院先后于 1984年春、 1989年春两次参加全国杉木家系区域试验。方差分析表明 :提供家系的种子园之间以及种子园内家系之间各主要数量因子存在显著差异。对样本观测值进行标准化变换主成分分析 ,求出遗传综合指数 ,再聚类分析评价 :湖南靖州、江西赣南、广西柳州、贵州东南、福建三明、广东曲江种子园提供的家系生长有明显优势。     

Weather and human impacts on forest fires: 100 years of fire history in two climatic regions of Switzerland

Understanding the factors driving past fire regimes is crucial in the context of global change as a basis for predicting future changes. In this study, we aimed to identify the impact of climate and human activities on fire occurrence in the most fire-prone regions of Switzerland. We considered forest fires, land use and meteorological data over the period 1904-2008 in the neighboring mountain cantons (states) of Valais and Ticino, which are characterized by distinct climatic regimes.The presence/absence of fire ignitions was analyzed using the Nesterov ignition index (as a proxy for fire weather), road density (for ignition sources), livestock density (for biomass removal), and change in forest area (for fire-prone abandoned agricultural areas).We found that fire weather played a key role in fire occurrence in both regions. Road and livestock densities had similar influences in the two cantons. However, while the increase in forest area was well correlated with fire occurrence in Ticino, no such correlation was evident in Valais, probably because land abandonment and forest cover change have been less extensive there. Our findings emphasize the non-linear nature of the relationships between fire occurrence and anthropogenic drivers, as we found thresholds above which road density was no longer correlated with fire occurrence. This implies that the projected future increase and spatial concentration of the human population may not result in a further increase in fire risk in intermediately to densely populated areas in both cantons.The driving factors behind fire activity differ slightly in the two cantons, in particular with increasing forest area enhancing fire occurrence in Ticino but not in Valais. These differences should be taken into account when assessing future fire risk, especially in Valais where the potential for an increase in the fire-prone area is still high. Fires are likely to become more frequent in a warmer climate, but future fire activity may develop differently in the two cantons. This should be taken into account when planning optimized fire prevention measures. This case study should help to better understand fire activity in highly populated regions where fire activity is still moderate but might markedly increase under a projected more fire-prone climate.     

长白落叶松人工林林隙间伐对林下更新及植物多样性的影响

2009年7月中旬,以佳木斯孟家岗林场间伐8年后的34年生长白落叶松人工纯林为对象,分析均匀间伐、大林隙和小林隙的林下更新和植物多样性。结果表明:与均匀间伐相比,林隙内出现了树高超过1.5m的胡桃楸、山杨和春榆等喜光阔叶树种,大林隙中出现树高超过2m的胡桃楸幼树;林隙内更新树种的个体密度、平均高和平均地径明显增加,大林隙尤为显著(P<0.05);林隙内木本植物的Simpson多样性指数和盖度均显著高于均匀间伐(P<0.05);与小林隙相比,大林隙内木本和草本植物盖度均显著增加(P<0.05);木本植物竞争种的重要值表现为大林隙>小林隙>均匀间伐,耐胁迫种的重要值相反(P<0.05);大林隙内1年生草本植物的重要值显著高于小林隙和均匀间伐(P<0.05),多年生草本植物则相反(P<0.05);大林隙Grime'功能群中杂草种的重要值高于小林隙和均匀间伐,耐胁迫种则相反(P<0.05);小林隙与均匀间伐的草本植物不同生活型及Grime'功能群的组成差异不明显(P>0.05);林隙间伐结合均匀间伐可以将长白落叶松人工纯林改造成长白落叶松针阔混交异龄林,较单独实施均匀间伐更有利于林下更新和植物多样性的提高,间伐林隙应...     

保松灵防治松墨天牛的林间试验

松材线虫病 [Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle]严重威胁我国的森林资源。浙江等地每年因该病造成大量松树枯死 ,防治松材线虫病刻不容缓。当前 ,我国防治该病主要措施是清理枯死松树 ,降低媒介昆虫松墨天牛 (Monochamus alternatus Hope)密度 ,减缓病害扩散蔓延。但在风景名胜区的松林和古树名木等 ,一旦发生该病 ,仅清理死树是不够的 ,必须采取保护性措施 ,防止因病害导致大量宝贵松树枯死。在日本 ,长期以来主要措施是在松树树冠进行空中或地面喷洒杀螟松、倍硫磷、西维因等农药 ,杀灭松墨天牛成虫 ,从而防治松…     

Effects of Gliricidia sepium (Jacq.) Steud and Leucaena leucocephala (Lam.) de Wit on growth and development of Imperata cylindrica (L.) Raeuschel.

Field studies carried out in a forest transition site on a tropical Alfisol in southwestern Nigeria, show that shading by gliricidia (Gliricidia sepium (Jacq.) Steud) and leucaena (Leucaena leucocephala (Lam.) de Wit) hedgerow species reduced density of speargrass (Imperata cylindrica (L.) Raeuschel) by 67% and 51%, respectively. Shoot biomass of speargrass decreased by 81% and 78% in gliricidia and leucaena hedgerows, respectively. Reduction in speargrass rhizome biomass in gliricidia plots was 96% while rhizome reduction in the leucaena plots was nearly 90%. Rhizome mortality was significantly higher in gliricidia plots than in leucaena and control plots. The bulk of rhizomes was found between 10 cm and 20 cm of soil depth but rhizome did not penetrate further than 30 cm depth in the Alfisol in which this study was carried out. Gliricidia was better than leucaena hedgerow species in suppressing speargrass.     

内蒙古沙区森林碳储量及其动态变化

根据内蒙古第五次和第六次森林资源连续清查资料,分析计算了内蒙古各沙区森林碳储量及其动态变化。结果表明:内蒙古各沙区森林总碳储量为4 898.05万t,其中沙地为4 614.85万t,沙漠为283.2万t。5年间(2003—2008年)内蒙古各沙区森林总碳储量净增加921.07万t,平均每年净增加184.21万t,核算成二氧化碳总量为675.44万t,占内蒙古年排放量二氧化碳的2.36%。