人造板游离甲醛释放量测定的主要影响因素的研究

试验表明，人造板在存放过程中，板材的游离甲醛释放量逐渐下降并趋于稳定。在测定中的萃取时间、样品大小、甲苯的重复使用对测定结果都有一定的影响。     

印度黄檀适生性的气候因子研究

气候因素是影响印度黄檀生长的主导因素之一,对印度黄檀的造林气候适生性进行研究,结果表明:印度黄檀适于年平均气温20~27℃,极端最低气温0℃以上,极端最高气温39~43℃,年平均降水量600 mm以上的地区。印度黄檀适于云南干热河谷地区的荒山造林。     

Influence of main site factors on Fraxinus mandshurica（Oleaceae） plantation

The investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao‘er Mountain Experimental Station of Northeast Forest University.tree height(H),diameter at breast height(D1.3) and the increment of tree height in 5 years (H5),the thickness of humus layer,as well as the soil moisture were measured for the plantation and the growth indexes(H,D1.3,H5) for different site conditions were analyzed.The results showedthat main site factors influencing the growth of Fraxinus mandshurica were soil moisture,gradient and location of siope in order.The growth of Fraxinus mandshurica was better on the middle-or up-slope site than on the down-slope site.Soil moisture and late frost caused by terrain are the main reasons that limit the growth of Fraxinus mandshurica plantation.     

环境因子对树木细根生物量、生产与周转的影响

细根在森林生态系统C平衡和养分循环中的重要作用已为大量研究所证实，树木有赖于细根吸收水分和养分，而细根对环境胁迫比较敏感，因此细根动态可指示环境变化，还可反映树木的健康状态，影响树木细根生产和周转的因子很多，本文在收集大量研究文献基础上，讨论了文献基础上，讨论了土壤养分，水分、pH值，温度等环境因子以及大气CO2增长对树木细根分布，生物量，生产和周转的影响，以期为我国开展细根生态学研究提供参考。     

气候因子对木材特性影响的研究进展

对国内外在木材学、气象学、植物学等领域内有关气候因子对木材特性影响的研究现状进行了总结和分析，阐述了进行气候因子对木材特性的影响研究的重要意义；光照因子、温度因子、湿度因子、降水因子以及自然灾害对木材特性的影响规律；气候因子对木材特性影响的研究方法；同时展望了气候因子对木材特性影响研究的发展方向。     

杉木幼林年生长节律划分和相关气候因素分析

杉木幼林年生长规律及气候因素对生长的影响,是合理制订杉木产区区划,改善杉木造林规划设计布局,正确实施经营管理措施的基础。 本项研究,将全国杉木西部试区的四川高县作为试验点,从1985～1988年,连续4年在5～8年生不同密度林分中,作了胸高直径及树高生长的旬期定期观测。经对这些实验数据作均值处理,聚类分析,关联分析和多元回归分析结果表明:对生长在中国杉木中带西部产区,处于中亚热带湿润气候区环境条件下的杉木幼林年生长规律的论证及对影响生长的主要气候因子的分析判断和预测,具有可靠性和区域代表性。     

From Framework to Forest Activities: A Comparative Analysis of Different Ownership Types in Two Adjacent Regions

The paper examines the interactions between the demands of society, the restrictions due to recreational and protective functions of forests and the intensity and kind of forest management in the various ownership classes in Switzerland (CH) and Baden–Württemberg (BW) in south–west Germany. A survey was carried out among owners of communal forests, private forest landholders owning more than 200 ha of forest land and small-scale forest enterprises with up to 200 ha of forest land. The survey adopted a two-dimensional approach, using regions and comparable ownership classes in order to identify basic differences and underlying key drivers. It became obvious that there are relevant distinctions between the two countries. The paper highlights the present use of forests, the restrictions perceived by their owners, and the underlying management strategies in terms of structure of the forests, tree species composition and thinning activities. In BW the financial function is the dominant motivation for the majority of the private owners. The communities emphasize both timber and non-timber functions of their forests. Except for the protection function (avalanches, rockslides) the utilisation and importance of the forest in CH is lower than in BW. Profitability of forests continues to be a key-driver of intensity of forest management activities, but there is less influence on the choice of basic silvicultural strategies. The results of this comparative survey are placed in the context of a forest policy framework and the medium-term financial situation in the two countries.

影响高脂马尾松扦插成活率的主要因子研究

通过多年的高脂马尾松扦插育苗试验,结果表明:采用半木质化且幼化程度高的枝条,在适宜的水分、光照、温度的条件下,采用适宜浓度(含IBA1500 mg/kg)的生根粉,不但可以加快生根,而且可大大地提高生根率,全年扦插,成活率都可达90%以上。     

不同地理种源的麻竹笋-幼竹生长规律的研究

在漳州与永安开展麻竹地理种源试验,分析地理种源出笋物候期、秆高生长、枝叶生长的变异规律,及高生长与气象因子之间的关系.结果表明,漳州点以中带种源适应能力最强,笋期长,笋量分散,成竹率高.永安点则北带种源笋期长,以飞鸾种源尤为突出.各种源幼竹高生长呈"S"型曲线,采用Lo-gistic方程拟合精度较高.种源枝叶生长的变异以北带种源南移种植后,上抽时间提早,生长期延长.影响秆高生长的主要气象因子:旬平均气温＞旬最低气温＞旬降雨量.中带种源在漳州点受气象因子影响最明显.     

兰州市空气质量状况及与常规气象条件的关系

根据兰州市空气质量日报数据和同期的常规气象资料,研究了2001～2009年该市的空气质量特征,探讨了气象要素和城市空气质量之间的相互关系。结果表明：随着近年来该市开展大规模的环境综合治理工作,空气质量有了明显得改善。研究期间的空气质量以Ⅱ和Ⅲ级天气为主。主要污染物PM10、SO2、NO2年平均浓度在大部分年份超过国家空...