巴西城市森林揽胜

2003年1月,我们走进巴西,踏上这个拥有"地球之肺"美誉的国度。从圣保罗到坎皮纳斯,从巴西利亚到里约热内卢,森林无处不在,绿色无时不有。10天考察之旅。我们仿佛在不同风格的城市森林中漫游,迷人的海滩、神奇的高原,千姿百态的热带雨林、千奇百怪的民俗风情……在层峦滴翠的绿荫华盖之下,在如云似霞般的花园街景之中。显得那样宁静、自然而充满神韵。       

鉴真高僧成功起航的地方——记张家港市城市林业建设

鉴真乃唐代高僧,江苏扬州人。八世纪中叶,应日本邀请,五次航海均告失败,虽双目失明,仍矢志不渝,于古稀之年,从张家港古黄泗浦,再次扬帆东渡,终获成功,高僧把我国的佛学、医学、语文、建筑、雕塑、书法和印刷等传播到扶桑。今天向广大读者介绍鉴真高僧成功起航的地方——张家港。       

樟树

樟科(樟属),常绿乔木,树高达30m,胸径5m;树皮灰黄褐色,纵裂,树冠广卵形,枝条黄绿色,光滑无毛。单生互生,革质,卵状椭圆形,边缘微呈波状,下面微有白粉,叶基三出脉,脉腋有腺体,表面深绿色,有光泽。       

营造无甲醛污染的居室绿色生态环境

如何彻底解决装修中游离甲醛对室内环境的危害是提高环境质量十分重要的问题,文章介绍了国内外对这个问题的解决思路和目前无甲醛木塑复合人造板的研制情况。       

杉檫混交根系效应的研究

In this paper,the root system and their associated effect of mixed forest of Cunninghamia lanceolata and Sassafras tsumu at eight-year-old were investigated and analyzed.The results showed that Sassafras tsumu might play a important role in improving the root system of Cunninghamia lanceolata growth due to the single root weight of Cunninghamia lanceolata in mixed forest of Cunninghamia lanceolata and Sassafras tsumu was evidently more than that of Cunninghamia lanceolata in pure forest,and that there were different mixed effects in mixed forest of Cunninghamia lanceolata and Sassafra tsumu in different slope situation,which meant that the associated effect was better in higher slope situation than in lower slope situation,and which reflected in the effect of Sassafra tsumu to the height and D.B.H.growth of Cunninghamia lanceolata.This Study indicated that the associated effect was positively related to the effect of roots system.     

Propagation techniques on root turion sprout browse ofPopulus davidiana Dode

The root segments selected from dominant trees ofPopulus davidiana Dode were taken as reproductive material and were buried in different depths to carry out the reproduction of root turion sprout. The affecting factors of gemination rate, survival rate, and height growth for cutting wood of root sprout were comparatively analyzed. The results showed that the best suitable substrate for burying root is pearlite, with a germination rate of 15.16%. 3–4-cm root segments has the highest rate of germination (12.4%). The mixture of sand and soil (2∶1) is the best cutting substrate, with a survival rate of 81.3%, while as to height growth of cutting wood, the mixture of turfy and soil (1∶1) is the best. The cutting woods selected from different positions of stem show difference in height growth. The cutting wood from top stem is higher obviously than those from middle or low stem. Biography: XING Ya-juan (1969-), female, assistant researcher in Forest Research Institute of Heilongjiang Province, Harbin 150040, P. R. China. Responsible editor: Song Funan     

纤维性质对成纸性能的影响

对纤维的三个基本性质－长度、强度和粗度对纸性的影响进行了综述，着重讨论了对强度性质的影响。     

山西洪洞大槐树与明朝移民

"问我祖先来何处,山西洪洞大槐树。""祖先故居叫什么,大槐树下老鹳窝。"这首民谣在我国广大地区流传了600百余年,祖辈相传,妇幼皆知。       

Tree/wood quality in slash pine following long-term cattle grazing

Tree height, diameter, and grade were measured on 14 cattle grazing trial plots located on the Palustris Experimental Forest in Louisiana's Kisatchie National Forest. These plots had been established in the early 1960s. Mensurational data was gathered on 28 trees from grazed sites and another 28 from ungrazed plots. Increment cores were also taken from these trees. Statistical analyses showed no effect attributable to grazing on any of the variables measured: tree height, tree diameter at breast height, tree grade, growth rate, amount of latewood, unextracted specific gravity, or tracheid length. This revised version was published online in June 2006 with corrections to the Cover Date.     

毛白杨优良无性系(新品种)材性测定研究

按生长性状预选出毛白杨１３年生１０个无性系用于材质测定。试材取自北方大兴县测定林,每无性系在３个重复中各抽样１株,伐倒取样,分析表明,毛白杨无性系间纤维长度,宽度和长宽比差异极显著,重复率依次为０．７７７,０．５３７和０．６７６;木材全年密度,早材密度和晚材密度差异极显著,重复率依次为０．５３６,０．５１４和０．４２９。