模拟物理空间资源对麻疯树幼苗生长的影响

密度效应为常见的生态学术语,但对其本质缺乏认识。物理空间也是一种资源（M cConnaughay＆Bazzaz,1991）,为密度效应的认识提供了线索。本文利用密度与容器大小模拟物理空间资源对麻疯树幼苗形态与资源配置的影响,来阐明物理空间资源影响现象与机制。在密度栽植时,立地异质性无法抗拒无意中得到了空间限制的资源依赖性结果,增加了解释的复杂性与价值性。结果表明：1）大容器个体苗高、直径、头年生高度、当年生高度、叶片数量,叶生物量、根系生物量、头年生生物量、当年生茎生物量、总体生物量都明显大于小容器;2）大容器根系资源配置明显小于小容器,大容器当年生叶与茎生物量配置较高,而头年生茎生物量相对配置较低,表明空间不足限制了根系发育从而限制了地上部分生长能力;3）试验后测定容器土壤肥力,发现小容器肥力利用充足,元素浓度明显低于大容器;4）高密度组个体形态与生物量参数较大,中密度次之,低密度最低,这一意外结果与微地形造成的水分差异有关;5）高密度在资源充足,加剧了空间限制,使得当年生茎与根系生物量相对配置增加,而低密度因微地形可能水分缺乏明显,根系生物量配置增加。物理空间也是一种资源,这种资源与生态学中生态空间含义不同,单纯是一种资源因子。     

龙脑樟容器扦插育苗技术研究

介绍龙脑樟容器扦插育苗技术,以黄心土为基质,选择较大容量的容器和合适的扦插季节,生根率可达63%,可以实现工厂化育苗。     

设计使用分户燃气锅炉地板采暖系统的探讨

设计使用分户地板供热中的费用及舒适性问题。     

镶拼木地板生产刀具国产化的研究

本文对引进的镶拼木地板生产设备进行刀具国产化研究，试制替代刀具６种类型每套共１５片，其中主要矛盾为开料机刀具，对其基体变形、掉齿、超差、耐用度等进行分析，替代刀具取得显著的经济效益和社会效益     

番龙眼地板毛坯干燥工艺基准和干燥工艺实施

为了提高番龙眼地板毛坯干燥质量,对25mm厚的番龙眼地板毛坯进行低温低湿干燥工艺的研究.探讨了番龙眼木材干燥工艺基准的制订,并通过番龙眼木材干燥工艺的实施对其干燥结果进行分析,为进一步研究制订番龙眼木材干燥工艺提供了思路和方法.     

测试方法对运动木地板表面摩擦系数的影响

针对运动木地板的表面摩擦系数进行测试分析,对比了2种不同测试方法所得到的表面摩擦系数之间的差异。结果显示:使用自主研发的表面系数摩擦仪所测得的动摩擦系数与摆锤测试结果基本保持一致,而静摩擦系数要大于动摩擦系数。     

基于形态学重构的实木地板缺陷分割方法研究

针对传统区域生长方法中,由于噪声种子存在及种子点单步邻域搜索所导致的分割时间长、检测精度低的问题,提出基于形态学重构的实木地板在线缺陷分割方法。方法首先定义不同阈值下的两幅模版图像,其中低阈值图像用于种子优化,高阈值模版用作种子膨胀生长;通过定义腐蚀终止准则,完成低阈值图像下的缺陷骨架提取;运用"去毛刺"操作,最终实现缺陷骨架内的种子点优选;然后,运用测地膨胀,结合高阈值模版,完成板材缺陷区域的快速生长;最后,应用"孔洞填充"、"去毛刺"优化边缘,实现缺陷目标的提取。实验分别在像素512*512、256*256和128*128下进行,通过与传统区域生长方法的比较,表明方法实现了缺陷区域的准确分割,分割速度与精度能够满足地板在线分选要求。     

Landscape hierarchies influence riparian ground-flora communities in Wisconsin, USA

We examined the distribution of ground-flora species (herbaceous and woody species <1 m tall) across riparian areas of northeastern Wisconsin in an effort to understand how hierarchical landscape properties, such as the physiographic system (ground moraine and outwash plain), valley system (constrained and unconstrained), and valley floor landforms influence distribution patterns of ground-flora species and functional plant guilds across riparian areas of small streams and rivers in a glacial landscape. A total of 162 species were recorded on 417 (1 m²) plots stratified by four different valley types that reflect the dominant physiographic system and valley system (constrained ground moraine, constrained outwash plain, unconstrained ground moraine, unconstrained outwash plain) and transverse geomorphic structure (valley floor landforms including floodplains, terraces, slopes, and adjacent uplands). Although distribution patterns of individual ground-flora species are highly variable among the four valley types, canonical correspondence analyses (CCA) of individual valley types indicate that ground-flora vegetation is related strongly to hierarchical landscape properties, including valley type and the transverse geomorphic structure of the stream valley. Vegetation ultimately reflects the influence of hydrogeomorphic processes that shape valley floor landforms. Constrained valley types tend to be characterized by diverse floodplain ground-flora communities dominated by graminoids and pteridophytes, while the terraces and slope plant communities are comprised of facultative upland and obligate upland perennial forb and woody species whose distribution appears to be a function of topographic features, such as aspect. However, ground-flora communities of unconstrained valley types appear to be responding not only to changes associated with the transverse geomorphic structure of the riparian ecotone, but also to more localized changes in environmental conditions associated with flooding and hydrologic regime. As a result, floodplain, terrace, and slope ground-flora communities tend to be diverse, dominated by a mixture of obligate wetland, facultative wetland, and facultative species. Thus, variation in riparian plant community characteristics can be explained using a nested, hierarchical landscape framework to organize and group different riparian settings based on the underlying geomorphic processes shaping stream valleys. Based on these results, we suggest that riparian management zones (RMZs) designed to maintain riparian function should be variable in width rather than fixed, encompassing variation in valley floor landforms and valley walls, regardless of the physiographic system.     

马尾松、华山松容器育苗施肥研究

研究容器苗施肥方案,其结果是马尾松速生期肥料比例,N、P、K为3∶2∶1,即Co(NH2)21 600 mg/L、Ca(H2PO4)24 000 mg/L、K2SO4800 mg/L,生长后期以3∶2∶2为佳,在苗龄40 d开始施肥。华山松生长期肥料比例以N、P、K为3∶2∶2,即Co(NH2)21 600 mg/L、Ca(H2PO4)24 000 mg/L、K2SO41 660 mg/L,在苗龄40 d开始施肥。     

BL-甲醛消纳剂在竹地板上的应用研究

针对我国竹地板销售价格连年走低、环保要求日益严格的现状,提出了将无毒、高效、低成本、生产和使用方便的BL-甲醛消纳剂应用于竹地板生产的设想.作者使用BL-甲醛消纳剂分别在竹地板上进行了小试和中试,并分析了BL-甲醛消纳剂在竹地板上的应用前景.结果表明,使用BL-甲醛消纳剂完全可以生产出高强度、低成本、环保的竹地板;BL-甲醛消纳剂和芬兰太尔化工有限公司生产的Aerolite UP4116胶配制使用时,较佳的添加量为20%～30%;BL-甲醛消纳剂在竹地板行业应用前景广阔.