海南特有珍贵红木树种——降香黄檀

<正> 降香黄檀(Dalbergia odorifera T.Chen),别名花梨、降香檀、香红木、花榈、香枝、花梨木、黄花梨,商品名SCENTE-DROSE WOOD(香红木)。海南本地还分油梨和糠梨,前者心材比例大,棕褐色,后者心材比例小,红棕色至紫棕色,为国家二级保护植物,海南5种特类材之一,也     

小灵猫

别名七节狸、笔猫、乌脚狸、香猫学名Ｖｉｖｅｒｒｉｃｕｌａｉｎｄｉｃａ英文名ｓｍａｌｌｉｎｄｉａｎｃｉｖｅｔ灵猫科Ｖｉｖｅｒｒｉｄａｅ分布长江流域以南及海南、台湾、西藏国家二级保护动物小灵猫外形与大灵猫相似而较小,体重２－４千克,体长４６－６１厘米,比家猫略大,吻部尖,额部狭窄,四肢细短,会阴部也有囊状香腺,雄性的较大。肛门腺体比大灵猫还发达,可喷射臭液御敌。全身以棕黄色为主,唇白色,眼下、耳后棕黑色,背部有五条连续或间断的黑褐色纵纹,具不规则斑点,腹部棕灰。四脚乌黑,故又称“乌脚狸”。尾部有７－…     

10个土种育苗试验

为提供育苗造林适土适树的科学依据,1986年开展了林苗土宜试验工作.地点:长宁县河东乡营盘山,土壤沙溪庙科酸性紫色土,海拔400m,地势向阳,年降雨量1200——1300mm,年平均温度18.3℃,年日照时数1198.4小时.供试土种10个:须家河科冷沙黄壤,飞仙关科暗紫泥,夹关科红紫泥、黑色石灰土、沙溪庙科酸性紫色土、沙溪庙科灰棕紫泥、新冲积土、蓬莱镇科紫泥、遂宁科红棕紫泥、嘉陵江科黄泥.供试树种10个:华山松、香桂、露丝柏、安息香、大叶相思、桂花、侧柏、黄柏、柳杉、红豆杉.     

喀斯特的绿色乐章

花繁叶茂的羊蹄甲举起无数把小伞,把人行道遮得严严实实;团团扁桃、串串紫薇迎风摇曳,仿佛向人们点头致意;桂花、白玉兰、九里香花香四溢,沁人心脾;椰树、棕榈、凤尾竹含芳吐茵、青翠欲滴,好一派树掩白楼山水绿,花映庭院草木香的南国风光!这里就是刚刚荣获“全国绿化先进单位”和“全国部门造林绿化400佳单位”双奖的广西平果铝业公司——一曲从喀斯特地域流淌出来的绿色乐章。 一、绿化与基建同步进行 敢吃螃蟹的平果铝人构筑了中国有色建设史上的旷世奇观     

棕背平秋季分布规律的探讨

棕背平 (ClethrionmysrufocanusSundevan)主要在秋季以后危害树木。通过对方正林业局六块地的调查 ,结果表明 ,棕背平的秋季分布规律受坡度影响极大 ,同下草、下木的繁茂程度有着十分密切的关系。坡度的增大 ,棕背平的分布量就逐渐少 ,林内杂草、下木繁茂 ,棕背平的分布数量就多 ,反之就少。提出了对棕背平的重点防治、适当防治、高峰年防治与平年不需防治及任何时候都不需防治林地的条件 ,为棕背平的防治提供了科学依据。     

野生动物保护管理现状及对策

阳是全省重点林区县之一,地处南岭余脉,阳明山北麓,根据“八五”资源调查及1998－1999年全县陆生野生动物调查等有关资料,野生动物资源现状为：二级保护动物有穿山甲、大鲵、果子狸、木鹿、河底、香障、白鹭、猴面鹰、草枭、鸳鸯、红腹角雉、白冠长尾雉、苍鹰、雀鹰、赤鹭、平胸龟、虎纹蛙、水獭等;三级保护动物有竹鸡、环颈雉、山斑鸠、华南兔、红腹松鼠、银星竹鼠、刺犯、密狗子、豪猪、野猪、黄动、鼬獾、棕鼯鼠、猪獾、红头潜鸭、青头潜鸭、鸬鹚、画眉、啄木鸟、棕背伯劳、董鸡、大嘴乌鸦、红嘴相思鸟、八哥。喜鹊、杜鹃、勺鸡、山…     

风景过程主义视野下城市棕地的景观再生

随着城市化发展和产业转型,城市中的棕地问题日益突出。风景过程主义提倡遵循自然规律和生态原理,引导和利用自然过程进行设计,为城市棕地的土壤修复、水质改善、栖息地恢复、灾害调控和文脉延续提供了生态性与艺术性并存的解决思路。文章通过分析3个城市棕地景观再生案例,提出分期规划建设的过程调控策略,并归纳总结城市棕地再生中5种风景过程类型及4种表现手法,为类似实践项目提供借鉴和思考。     

城市棕地的景观更新与再利用的模式研究

指出了随着当今社会的发展,棕地的更新和再利用不仅蕴含着良好的经济、生态和社会价值,也是现代城市发展的必由之路。介绍了城市棕地景观更新与再利用的优势,总结并探讨了国内外棕地项目中广泛使用的四种模式:城市公共空间、创意产业园、新型居住区和工业遗产旅游区,以期为未来棕地再利用项目提供参考和借鉴。     

棕纤维材料特性及床芯生产工艺

棕纤维床垫是一种以棕纤维为主体材料,采用胶黏剂使其相互粘连,使棕纤维之间的交点成网状,从而形成胶点胶结的多孔结构和具有一定弹性的床芯,再在其表面覆以面料制成的床垫.它具有绿色环保、通爽透气、软硬适中等特点,深受消费者喜爱.笔者通过实验分析了棕纤维的材料特性,并在总结生产经验的基础上,归纳出棕纤维床芯生产工艺流程,为进一步深入研究打下基础.     

龙陵县森林资源特点及今后发展措施

1 概况 龙陵县地处云南省西部边陲,东径 98°25′—99°11′,北纬24°07′—24°50′之间。属南亚热带低纬高原季风气候,泛北极植物区系和左热带植物区系。由于地形、地貌、气候复杂,植物种类丰富,产生了多种生态环境,有稀有植物—野生稻、玉米草和大树花生;珍贵树种—北热带的贺登木、宝树,南亚热带的冬棕;还有保留植物原始形态的活化石—醉香含笑、银杏、香果树和裸子植物苏铁。     

湖南省新记录植物

对2005年在野外调查采集的植物进行了鉴定.目前,共鉴定出湖南新记录种7个,即中华鹿藿Rhynchosia ch inensisH.T.Chang ex Y.F.W e i et S.L ee、短序鹅掌柴S cheff elera bod in ier i(L ev l.)R ehd.、粉团雪球荚V iburnum p lica tum Thunb.、贯叶过路黄Ly sim ach ia p erf olia ta H and.-M azz.、紫苏草L im noph ila a rom a tica(L am.)M err.、叉唇虾脊兰C a lanthe hancockii R o lfe、疏花虾脊兰C a lanthe henry i R o lfe;鉴定出新记录变种2个,即远齿粗壮景天S edum eng ler i H am et var.d enta tum S.H.Fu、紫药红荚V iburnum.erubescensW a ll.var.p ra ttii(G raebn.)R ehd..     

Light environment alters ozone uptake per net photosynthetic rate in black cherry trees

Foliar ozone uptake rates of different-sized black cherry (Prunus serotina Ehrh.) trees were compared within a deciduous forest and adjacent openings in north-central Pennsylvania during one growing season. Study trees included open-grown seedlings and saplings, forest understory seedlings and saplings, and sunlit and shaded portions of mature canopy tree crowns. Instantaneous ozone uptake rates were highest in high-light environments primarily because of higher stomatal conductances. Low ozone uptake rates of seedlings and saplings in the forest understory could be attributed partially to lower average ambient ozone concentrations compared to the canopy and open environments. Among the tree size and light combinations tested, ozone uptake rates were highest in open-grown seedlings and lowest in forest-grown seedlings. Despite lower ozone uptake rates of foliage in shaded environments, ozone uptake per net photosynthesis of foliage in shaded environments was significantly higher than that of foliage in sunlit environments because of weaker coupling between net photosynthesis and stomatal conductance in shaded environments. The potential for greater ozone injury in shaded environments as a result of greater ozone uptake per net photosynthesis is consistent with previous reports of greater ozone injury in shaded foliage than in sunlit foliage.     

Utility of genotype × environment interactions

With increasing knowledge about how nutrient and water availability affect tree growth, and with new techniques of genetic manipulation becoming known, it seems appropriate to ask whether the two can be combined. Is it possible or worthhile to produce genotypes tailored for specific nutrient or water conditions?

Interactions between genotypes and the environments in which they grow have frequently been shown to be statistically significant for a wide range of tree species in many environments. However, the practical importance of the interactions is highly questionable as additional genetic gains to be had through using the interactions are very small in relation to the overall gains themselves. Interactions seem very large for seedling experiments in glasshouse trials, but are much less in field trials even when the environments are extensively modified by fertilizers. For the genotypes to be matched to environments, those environments must be well-defined and repeatable.

Sites where there are specific problems tend to be well-defined and repeatable. Matching genotypes to such sites may provide a useful solution to those problems. The genotypes may be produced as seed from crosses or as clones from tissue culture or, more conventially, from stem cuttings. Selection in vitro for particular traits requires a level of knowledge about the traits generally absent for forest trees. When the ways in which diseases or poor adaptation effect trees are better known, such selection may become practicable. We do not believe it is practicable at present for diseases or for nutrient or water relations.     

张掖市水资源可持续利用与生态建设对策

通过对张掖市水资源特征分析及水资源利用评价，阐述了水资源可持续利用和发展中存在的水资源紧缺、生态环境恶化等问题，提出了开源节流、以节水为主，坚持水费改革，改善生态环境等措施。认为张掖市社会经济要发展，保护和改善生态环境是前提，水资源可持续利用是关键。只有珍惜、保护、合理利用和科学管理水资源，重视保护和改善生态环境，解决好生态环境建设的体制、机制和投资，提高其效益，才能确保水资源的可持续利用，促进张掖市生态和社会经济可持续发展。     

城市建筑环境中绿色基础设施对大气颗粒物的影响

城市树木与森林作为街道、公园和其他绿色公共可达空间等城市景观的重要组成部分,是控制城市大气污染、改善城市空气质量、促进居民健康的重要环境工具,提高城市绿色基础设施的比例是解决城市空气污染问题的重要策略与手段之一,在不同建筑环境中如何配置、设计绿色基础设施,以达到最佳的空气污染治理效果,需要充分评估多种因素的影响。文章系统分析了街道峡谷、开阔道路和建筑围护结构3种城市建筑环境中绿色基础设施对空气质量的影响,阐述了在不同建筑环境中开展绿色基础设施建设需要考虑的重点问题,为在城市建筑环境中更好地设计和建设绿色基础设施提供参考。     

广西森林火灾的时空分布及其影响因素

对比分析了广西壮族自治区历年森林火灾发生次数与为害面积的季节分布、月份分布和市县分布以及影响广西壮族自治区森林火灾时空分布的大气环流、地形、干旱和洋流等因素.结果表明:环境条件是影响森林火灾发生与发展的最关键因素,森林火灾发生有其自然属性.在此基础上提出对一个地区的森林防火工作进行评价时,不单是要考查其管理能力和森林火灾损失大小,也要考虑其环境条件的影响作用.旨在为广西壮族自治区森林火灾的预防和扑救工作提供科学的理论依据.     

新世纪人居环境的塑造

通过对改革开放以来广州住宅小区居住环境发展进程的研究,结合实例从住宅小区居住环境的发展初期、发展中期到相对成熟期的变迁分析了区域性人居环境的基本特征,提出了新世纪岭南地区人居环境的理想模式。     

Fire Occurrence Environments in Pinus pumila Forests

In recent years, many serious forest fires occurred in precious Pinus pumila forests in Daxing'anling Mountains of Heilongjiang Province and Inner Mongolia. But up to now, there is still a lack of proper understanding of fire occurrence environments in P. pumila forests. In present paper, we investigated and studied the fire occurrence environments. The results showed that fires in P. pumila forests had their own special fire environments. Abundant fuel, drought weather, dry thunder and high altitude terrai...     

人参果引种与栽培技术措施

介绍了人参果主要性状及对环境要求 ,总结了人参果栽培管理、疏果与采收、度夏与越冬等技术措施。     

Diverging rationalities between forest fire management services and the general public after the 21st?century mega?fires in Greece

Wildfire risk related to hazards on people and assets is expected to increase in the face of climate change, especially in fire-prone environments such as the M...