中国茎峰科分类研究──Ⅱ简脉茎蜂属（Janus Stephens）及其近缘属（膜翅目：茎蜂科：哈茎蜂族）

记述了中国简脉茎蜂属６种，含２新种，张茎蜂属１种；藏茎蜂属，１新属新种；总计３属８种．新属和新种的模式标本保存于中南林学院环境与资源系昆虫标本室．还编制了简脉茎蜂属东亚区已知检索表及哈茎蜂族已知属检索表．     

4种榆科珍稀树种的种苗形态研究及其栽培效果

对琅琊榆、糙叶榆、长序榆、栗叶榆等4种榆科珍稀树种从种子(翅果)到幼苗的形态做了探索性研究,对其形态通过观察、记载而绘制成图。此4种榆科树种的苗木定植3年后经评价,表明在福建来舟林场已引种成功。     

Comparison of image and rapid field assessments of riparian zone condition in Australian tropical savannas

Suitable methods for measuring and monitoring the condition of riparian environments are being investigated by government agencies responsible for maintaining these environments in Australia. The objective of this work was to compare two riparian condition assessment approaches, the Tropical Rapid Appraisal of Riparian Condition (TRARC) method developed for rapid on-ground assessment of the environmental condition of savanna riparian zones and an image based riparian condition monitoring scheme. Measurements derived from these two approaches were compared and correlated. The sample representativeness of the TRARC method was evaluated and the cost-effectiveness and suitability for multi-temporal analysis of the two approaches were assessed. Two high spatial resolution multi-spectral QuickBird satellite images captured in 2004 and 2005 and coincident field data covering sections of the Daly River in the Northern Territory, Australia were used in this work. Both field and image data were processed to map indicators of riparian zone condition including percentage canopy cover, organic litter on the ground, canopy continuity, tree clearing, bank stability, and flood damage. Spectral vegetation indices, image segmentation, and supervised classification were used to produce riparian health indicator maps. QuickBird image data were used to examine if the spatial distribution of TRARC transects provided a representative sample of ground based estimates of riparian health indicators. Covering approximately 3% of the study area, the sample mean of the TRARC estimates of individual indicators of riparian zone condition were in most cases within 20% of the global mean derived from the whole imaged riparian area. The cost-effectiveness of the image based approach was compared to that of the ground based TRARC method. Results showed that the TRARC method was more cost-effective at spatial scales from 1 km to 200 km of river in relatively homogeneous riparian zones along rivers with only one channel, while image based assessment becomes more feasible at regional scales (200–2000 km of river). A change detection analysis demonstrated that image data can provide detailed information on gradual change, while the TRARC method is less suited for multi-temporal analysis due to the ranked data format, which inhibits precise detection of change. However, results from both methods were considered to complement each other for single date assessment of riparian zones if used at appropriate spatial scales.     

A commentary on current approaches to forest population genetics

Some of the most frequently chosen approaches to forest population genetics as reflected in the present volume are discussed, and some topics possibly deserving more attention are addressed. Among the first are studies of self-fertilization as a characteristic of forest tree mating systems, gene markers as indicators of adaptive or phylogenetic differentiation, and methodological aspects of the measurement of genetic differentiation. The latter mainly concern generalizable methods of analysis and the involvement of gene markers in the determination of mating systems, detection of mechanisms of frequency dependent selection, and the incorporation of genetic profiles (characteristics of frequency distributions of genetic types) into population genetic analysis.     

GROWTH AND YIELD MODELS FOR DAHURIAN LARCH PLANTATIONS

Growth and yield models were developed for individual tress and stands based on336 temporary plots with 405 stem analysis trees of dahurian larch(Larix gmelinii(Rupr.)Rupr.)plantations throughout Daxing’anling mountains.Several equations were selected using nonlinearregression analysis.Results showed that the Richards equation was the best model for estimatingtree height,stand mean helght and stand dominant height from age; The Power equation was thebest model for prediction tree volume from DBH and tree height; The logarithmic stand volumeequation was good for predicting stand volume from age,mean height,basal area and other standvariables.These models can be used to construct the volume table, the site index table and other for-estry tables for dahurian larch plantations.     

Biogeography of mangrove and saltmarsh vegetation: implications for conservation and management in Australia

Despite an undeserved reputation for being dull and homogenous systems, mangal and saltmarsh in Australia have highly complex patterns and processes. Their role as key edge systems between land and sea has implications for many species which have larval stages in mangal and saltmarsh, but spend adult life as benthic, pelagic or demersal species. Many such species are also important commercially. Mangal and saltmarsh are both highly dynamic systems, reacting rapidly to changes in hydrological condition and sedimentation. In many areas of the world mangal and saltmarsh are threatened systems, especially near human habitation. Appropriate management strategies for mangal and saltmarsh are therefore critical for both conservation and sustainable use, the two key objectives of the Convention on Biological Diversity. Clearing and associated development, invasion of alien species, pollution effects and poor management are the key threats to these systems. Management at a bioregional level, including the development of a comprehensive system of protected areas, is identified as the key management strategy which will ensure an adequate future for these dynamic systems.     

南方铁杉与长苞铁杉物理力学性质研究

本文对产于福建省武夷山市的南方铁杉和连城县的长苞铁杉进行了较系统的材性试验研究,提供了必要的该铁杉属木材的物理力学性质指标。     

白僵菌优良菌株的选育

本研究将所收集的28个菌株,用稀释单孢分离的方法,进行生长特征、生长速度、产孢量和室内外对松毛虫致病力的测定比较,以闽林2、闽林1、闽林3号菌株表现突出,为优良菌株。     

福建经济竹种开发利用与竹业经济发展对策研究

本文论述了福建主要经济竹种资源及其分布特点、经营利用现状与存在的问题,并探讨了市场经济条件下,经济竹种开发利用与竹业经济的发展对策。     

黑龙江省夏季林火时空分布特点

通过对2000~2004年黑龙江省夏季森林火灾进行研究分析发现,该地区夏季林火呈现明显的空间、时间分布特点。(1)黑龙江省夏季林火只在121°12′~130°16′E和46°53′~53°25′N之间发生过。(2)大兴安岭和黑河地区是黑龙江省夏季林火的主要发生地区,大兴安岭地区的夏季林火火因基本都是雷击火,黑河地区的夏季林火火因主要是烧荒。(3)大兴安岭及黑河地区各个县区夏季林火状况有很大不同。(4)6月是大兴安岭雷击火发生最多的时期,6月15~25日是烧荒引发夏季林火的重点时期。黑龙江省6月15~20日间发生的夏季林火次数最多,明显高于其他时间段,过火面积也最大。7月1~5日及8月20日以后均没有夏季林火发生。(5)黑龙江省夏季林火日变化规律较为明显地分为三个阶段。