Life cycle assessment of utilizing freshly cut urban wood: A case study

Large amounts of urban wood resources are generated through tree removals in urban areas. Therefore, there is a growing interest to improve the environmental performance of the urban wood supply chain by quantifying the environmental impacts of creating high-value products from urban tree removals to enhance its utilization. By surveying existing urban wood utilization operations for primary data in two major cities: Baltimore, Maryland, and Milwaukee, Wisconsin, a new life cycle inventory (LCI) dataset per m³ of dry urban hardwood lumber and live edge slabs was created. Incorporating the new LCI data into life cycle assessment method, the total global warming (GW) impact of converting urban trees to kiln-dried lumber was estimated to be 122 kg CO₂ eq and 336 kg CO₂eq per m³ of lumber produced for Baltimore and Milwaukee, respectively. In both cases, the total environmental impact of the product was dominated by the conversion of urban trees to kiln dried lumber at the sawmill processing stage. Using scenario analysis for the source of heat generation used in kiln (force) drying wood, substituting wood fuel from coproducts for natural gas in a boiler for Milwaukee resulted in a substantial reduction in fossil-derived GW impact. Urban and traditional hardwood lumber production follow similar GW impact trajectories over their life-cycle stages with the lumber processing stage having the highest environmental impacts for both. Increasing the overall lumber yield and decreasing kiln (force) drying would substantially improve the environmental performance of urban hardwood lumber and help make it comparable to traditional lumber.     

AutoCAD制图软件在汕头林业调查规划中的应用

从已有图纸资料的扫描输入,设置绘图环境,矢量化地形图,创建图层,用GPS数据绘制小班图,面积或路程求算,绘制图签、图例,文件保存格式,打印出图等方面阐述了AutoCAD在汕头市林业调查规划设计制图中的应用方法.认为用AutoCAD制图较Photoshop精度、效率高,并能较精确地进行面积及距离的求算.     

清水县发展肉牛产业的优势及原则

文章就清水县肉牛产业发展现状,政府政策,饲草资源,服务体系,市场环境以及群众养牛的积极性等方面综合分析,提出全县发展肉牛产业应当以农民为主体,进行科学养殖,考虑效益优先,同时兼顾生态良性循环等一系列指导原则,全面推进肉牛产业可持续发展。     

江苏沿海滩涂发展牧草业的前景

对江苏沿海地区的地理状况以及牧草产业的发展现状进行全面的描述,同时针对沿海地区滩涂土地后备资源丰富的特点,从当地农村产业结构、养殖业、牧草经济价值以及东部沿海开放型牧草业的发展前景等几个方面阐述。在江苏沿海地区,利用滩涂资源丰富优势,结合农村产业结构调整,发展滩涂牧草种植业,能够促进当地畜牧业的良性循环,改良滩涂土壤,提高滩涂的利用水平。     

Mixed Forests as a Part of Sustainable Forestry in Southern Sweden

Abstract

We review and discuss the applicability of mixed stands in the context of sustainable forestry in southern Sweden. This is done from a silvicultural perspective regarding aspects such as regeneration, pre-commer-cial thinnings, production, economy, damage and policy implications. The paper is based on literature reviews and on studies performed in southern Sweden or under comparable conditions. After considering the underlying mechanisms, we find that it is possible to establish a mixed stand in the regeneration phase and sometimes even to a lower cost compared to monocultures. To keep the mixture, or to create it, with pre-commercial thinnings is, however, often more expensive. The reviewed studies, together with a new simulation, show that the effect on productivity of mixed stands compared to monocultures is minor. Some positive effects on damage (i.e., decreased levels) in mixed stands have been found. The economy and the policy implications of mixed stand management were found to be dependent on the specific stand and situations. A general finding was that research and knowledge of managing mixed stands, as compared to monocultures, are limited, which in turn could limit the applicability of mixed stand management.     

云南澳洲坚果产业高质量发展的建议*

通过对云南澳洲坚果主产区的种植、加工、销售、品牌建设及产业扶贫等方面的调查,结合国内外澳洲坚果产业数据,分析云南澳洲坚果产业发展现状,查找产业发展中存在的问题及原因,提出云南澳洲坚果高质量发展的建议。     

天祝县鸡产业发展现状及前景对策分析

鸡产业作为天祝县八大产业之一,资源环境优越,生产效益稳定,市场潜力大。坚持龙头企业打造引领,科学规划养殖布局,落实工作措施,可有力推动全县畜牧业高质量发展,持续巩固拓展脱贫攻坚成果,加快乡村振兴步伐。     

草业科学在现代马业发展中的研究现状

马是人类社会发展的重要组成部分,人类种草养马历史悠久,但人们对马用饲草的认识和研究还不足,致使现代马业和草业科学发展存在严重脱节现象,影响了两者的可持续发展。因此,结合现代马业发展趋势及其对饲草的利用特点,综述了草地放牧、青干草、青贮及半干青贮饲草等在现代马业发展中的研究与实践现状,并提出了现代马业发展中草业科学存在的问题及建议,以期为保障现代马业的可持续发展提供理论指导,为拓展我国现代草业科学与技术发展空间提供参考。     

中国奶山羊产业发展现状和趋势

羊奶业是我国奶业的重要组成部分,是部分地区经济发展的重要支柱产业。论文简要介绍了羊奶的营养价值研究进展,世界、我国和陕西奶山羊产业的发展现状,并展望奶山羊产业发展前景,以期为我国奶山羊产业的发展提供参考。     

佳县红枣产业发展现状及其市场定位分析

针对红枣产业发展现状和出现的问题,分析了佳县红枣产业发展前景及市场定位,提出了开发红枣药用价值,促进产业结构优化,打造佳县红枣品牌,开展品牌营销战略等一系列措施,以促进红枣产业的科学化发展。