Silvicultural Problems of the Second Generation

There is no strict comparison with the regeneration of continentalforests. The second generation may give more trouble than thelater ones as the soil and emergent vegetation will not havefully developed into a true forest complex and we must try andguide the structure of the forest crop during the latter partof its existence to create as favourable a locus as possiblefor the establishment of its successor. Drainage, wind-blow, amenity, thinning r?gime, modern devicesand machinery for the reduction of brambles and of lop and top,and prevention of damage by Fomes are considered. The need in commercial forestry to confine planting to a fewmain species, most of which are more readily established infull overhead light, points to the advantage of simplificationrather than complication in management.     

Establishment of the Second Rotation in the Jutland Heath Plantations

The paper describes briefly the silvicultural methods used toregenerate stands of pure Norway spruce (Picea abies Karst.)or Norway spruce mixed with a small proportion of Silver fir(Abies alba Mill.) on the poor heath soils of Jutland. Regenerationafter clear felling, uniform shelterwood, and shelterwood stripfelling is described. The last method has advantages over theother two.     

亚洲出口第二的马来西亚家具业

马来西亚家具80％出口，居亚洲第二，世界排名第九位，2006年家具出口值20．7亿美元，东盟国家排名第一。 自1980年起。马来西亚家具业步入了飞速发展的快车道，政府采取各种措施和政策以鼓励发展家具业，计划建立10个家具村，如第一个家具村，建地30多公顷，已集中了310个家具厂。     

原木输送机与物料机械化运输

原木输送机作为一种物料输送机械，在起重运输机械行业应该占有相应的地位，本对原木输送机设计中与其他物料输送机械设计中存在的差异加以分析，得出原木量 种特殊的物料，即不能用块状物料输送理论套用，也不能用成件物品输送公式计算，必须用多年形成的自己的理论进行设计计算。     

中国绿化博览会广西展园设计浅析

中国绿化博览会集中展示了我国和国际生态建设的发展成果。广西展园通过对广西深厚历史沉淀和浓郁民族特色元素的融合、提炼,以壮族文化和巴马长寿文化进行元素的重组,让游客参与到展园的体验与创造过程中,使广西展园成为宣传广西的一个重要窗口,展示现代人对"让绿色融入我们的生活"的思考。     

Spring Frosts Affecting the Establishment of Second Rotation Crops in Thetford Chase

Spring frosts in Thetford Chase cause a major reduction in thegrowth of young Corsican pine and very severe frosts or repeatedfrosting may kill the trees. Records of temperatures taken ona range of sites and in different conditions have shown that(a) spring frosts occur every year at Thetford, but the severefrosts which kill trees outright may only occur once every fewyears, (b) frost damage to plants mainly occurs when the treesare less than 18 in (45 cm) tall, (c) forest clearings largerthan 5 acres (2 ha) do not act as artificial frost hollows,(d) cold air flows down slopes of more than 1° and accumulatesat the bottom, forming a frosty zone. Studies showed that frost damage can be minimized by (a) completecultivation, (b) deep ploughing, (c) underplanting, and (d)strip felling. The benefits of these measures are demonstratedby temperature records and by measurements of tree growth. Methods of reducing frost damage are necessary in areas proneto spring frosts if crops of Corsican pine are to be successfullyestablished at low cost.     

反求设计及其再设计在产品开发中的应用

介绍了反求设计的过程及其方法,讨论了反求分析与二次设计的关系,并进一步探讨了计算机辅助技术在反求设计中的作用和优越性。说明了反求设计是现代经济发展中设计高起点、高竞争力创新产品的重要手段。     

第二代杉木人工幼林生态系统土壤水文学功能的研究

以连续8 a的测定数据,探讨了皆伐对生态系统土壤水文学功能的影响,并着重研究了营造第二代杉木人工林后林木对土壤水文学功能的生物调节和恢复状况.结果表明:皆伐使土壤的蓄水能力下降25%,渗透能力下降20%～25%(初渗)和10%～24%(稳渗).营造第二代杉木人工林后,林地土壤蓄水能力逐步恢复,5年生杉木林对土壤蓄水的渗透和调节能力相当于成林的27%,38.3%～42.7%(初渗)和35.7%～45.2%(稳渗).8年生林,土壤蓄水能力已接近成林的93%,渗透能力已达到成林的91.4%～94.6%(初渗)和90%～98%(稳渗).第二代杉木人工林土壤水分垂直变化与第一代成林相比有很大的不同.从土壤水分动态变化推断,幼林的地下径流量将大于成林.同时,根据影响土壤含水量变化的几个主要因子,建立了预测土壤水分动态的数学模型.     

又见香梅

今年1月,本刊刊发了《缘起仙草识香梅》一文,文章介绍了著名国际社会活动家、一代名媛陈香梅与浙江森宇实业公司董事长、“江南仙子”俞巧仙的中药奇缘。今年5月10日,陈香梅女士从美国归来与“森宇”再续前缘。本刊记者有幸再次和香梅女士面对面,并向香梅女士介绍了《绿色中国》,新闻记者出身的她看得津津有味……