Tropical Timber Trade Flows in P.R. China

The historical transition of timber distribution pattern in China was presented firstly with main parts of timber flows in China, which included timber markets, timber transport system and regulations of timber transport. Based on the overview on tropical timber flows in China, the trade flows of tropical timber from production and imports of tropical timber to export of tropical timber products were analyzed by vivid illustrations. At the same time, problems in timber trade flows in China were analysed in the end.     

广西大明山自然保护区生态旅游开发中的社区参与研究

社区参与是生态旅游开发中的主要内容之一,采用问卷调查和访谈的方式。对广西大明山周边6个村（屯）的居民进行随机抽样调查。结果显示,大明山周边社区居民虽然对生态旅游开发现状不满意,但对生态旅游的参与具有很强的主观愿望,针对存在的问题,提出相应的对策。     

Prospect of Evaluation Study on Vegetation Degradation

Vegetation degradation is related to the stability and succession process of ecological systems.This paper combed and screened the recent national and international research on vegetation degradation,and discussed vegetation degradation research in terms of selection of reference ecosystem for evaluation,selection of evaluation index system and the selection of evaluation methods.At last,the direction of vegetation degradation research was predicted and prospected.     

东阳市生态公益林防护体系建设发展方向

东阳市地处浙江省中部，全市国土面积175211hm^2。为了改变树种结构单一，林分质量差，水土流失比较严重的局面，必须加快生态公益林建设。全市界定重点公益林35050hm^2，占林业用地的33％。介绍了公益林的总体布局以及保障措施。     

中国生物质能源的开发前景及适用植物探讨

从生物质能源开发的主要途径,生物质能源开发应重视的几个关键问题上论述了中国生物质能源的开发前景,又以生物质固体、液体、气体能源植物的角度介绍了适用于生物质能源开发的植物种类。     

Evidence that the negative relationship between seed mass and relative growth rate is not physiological but linked to species identity: a within-family analysis of Scots pine

Seed mass and relative growth rate (RGR) are important determinants of early seedling growth, and hence seedling establishment. Although a positive interspecific relationship between seed mass and seedling dry mass is well established, much less is known about the relationships among seed mass, seedling mass and RGR within species. We examined relationships among seed mass, seedling mass and RGR within and among maternal plant lines of Scots pine (Pinus sylvestris L.). To assess the effects of seed mass and maternal origin on RGR, individual seeds from two seed crops (years 2004 and 2005) of ten maternal plants growing under nursery conditions were weighed and then germinated. Seed mass was strongly determined by maternal plant, and seedling mass was largely determined by seed mass, with a positive correlation between these variables both across and within maternal plants. In contrast, RGR was weakly related to seed mass, with no consistent pattern in the sign of the relationship. It is well known that species differ in RGR and that RGR is related to seed mass across species. Lack of consistent evidence for this relationship within maternal lines, and for Scots pine overall, suggests that the relationship is not directly causal, but reflects consistent evolutionary covariation in these two physiologically independent traits.     

SV杨树专用肥施肥效应研究

通过对I-107杨的肥效对比试验表明:在黄土地区,施用SV杨树专用肥对1～2a生的杨树株高、地径的促增长效果显著。其中对扦插的杨树苗施SV杨树专用肥1a后,株高、径粗增长率分别比对照提高13.14%和44.62%;1a生杨树施SV杨树专用肥后,当年径粗增长率比对照提高47.93%,比施等量氮磷钾化肥提高45.35%。所以,SV杨树专用肥对幼苗期杨树的促生长作用明显。     

大溪河鸭江镇河段综合治理工程对当地水环境的影响研究

指出了大溪河受到喀斯特地貌的影响,存在着水资源短缺问题,分析了大溪河鸭江镇河段综合治理工程的目的、意义和工程的背景,并探讨了该工程对当地水环境保护的影响。     

6种防霉剂对毛竹重组材的防霉效果比较

以毛竹加缝竹篾为原料压制竹重组材,采用6种防霉剂分别对竹篾和板材试件作浸渍或涂布处理。经过1个月的防霉处理后,比较不同防霉剂、不同处理方法其防治效力的优劣,筛选出适用于毛竹重组材的2种低毒、高效防霉剂及其最佳处理方法。     

不同坡向杉木3代种子园土壤有效养分差异比较分析

以杉木3代种子园为研究对象,分析不同坡向杉木3代种子园土壤有效养分含量差异,从而为实现杉木种子园的合理施肥奠定理论基础。研究结果表明,同一坡向随着坡位上升以及同一坡位随着土层深度的增加,杉木3代种子园土壤有效养分含量呈逐渐下降趋势;同一坡位同一土层深度不同坡向对土壤有效养分含量的影响体现出较为复杂的规律。