山地阔叶混交林林木生长的空间异质性

以川西南亚热带阔叶混交林为对象,采用传统的罗盘仪对树体的相对空间位置进行定位,运用地统计学对林木20 a的断面积生长量进行分析,结果表明:林木的胸径(DBH)、断面积(BA)的空间自相关范围狭窄,林木断面积增长量的不同时段(1986—1991年,1986—1996年,1986—2001年,1986—2006年)在45°方向上空间变异较为明显。     

Effects of elevated nitrogen deposition on soil microbial biomass carbon in major subtropical forests of southern China

2003

Wallenstein M D.McNulty S.Fernandez I J.Boggs J Schlesinger W H Nitrogen fertilization decreases forest soil fungal and bacterial biomass in three long-term experiments [其它论文] 2006

Wang X F.Li S Y.Bai K J.Kuang T Y Influence of doubled CO2 on plant growth and soil microbial biomass C and N 1998(12)

Xue J H.Mo J M.Li J.Li D J The short-term response of soil microorganism number to simulated nitrogen deposition 2007(02)

Yao W H.Yu Z Y The nutrient content of throughfall inside the artificial forests on downland 1995

Yi Z G.Yi W M.Zhou L X.Wang X M Soil microbial biomass of the main forests in Dinghushan Biosphere Reserve 2005(05)

Zhou G Y.Yan J H The influence of region atmospheric precipitation characteristics and its element inputs on the existence and development of Dinghushan forest ecosystems [其它论文] -Acta Ecologica Sinica2001

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不同造林方式下闽楠幼林根系性状分析

以3种造林方式(18 a杉木林下套种闽楠、闽楠纯林、闽楠与杉木混交林)营造的闽楠试验林为对象,分析造林2 a后幼林生长情况,利用Win-RHIZO根系分析系统比较不同造林方式闽楠根系性状的差异。结果表明:杉木林下套种闽楠的平均地径、最大冠幅、苗高、枝下高、单株总根长、总表面积、根系总体积、根深和平均根幅均最大,依次为11.60 mm、61.33 cm、115.56 cm、32.42 cm、1269.13 cm、376.75 cm^2、9.32 cm^3、47.50 cm、48.42 cm;3种造林方式下闽楠单株根总长度均在根系直径0 mm4.5 mm、0.5 mm-2的林下套种方式最适合闽楠生长。     

不同来源绿僵菌对油桐鹰尺蠖幼虫的致病力比较

油桐鹰尺蠖Biston suppressaria (Guenée) 是一种杂食性食叶害虫,近年来在速生桉树林分中大 面积发生,造成较大的损失。文中研究了不同来源金龟子绿僵菌Metarhizium anisopliae 菌株生长与产孢 特性及对油桐鹰尺蠖幼虫的致病力,旨在筛选出高效防治该虫的生物资源。试验结果表明：不同来源的 绿僵菌菌株间菌落生长速度和产孢量差异显著,MaZPTR-01 菌株15 d 的菌落直径为6.5 cm,显著较其它 菌株大;MaFZ-13 和MaZPTR-01 菌株培养15 d 产孢量最高,分别为1.33×108 孢子· cm-2 和1.28×108 孢 子· cm-2。致病力测定结果表明：不同菌株对油桐鹰尺蠖幼虫的致病力存在显著差异,其中接种MaFZ-13 和MaZPTR-01 菌株的幼虫校正死亡率、僵虫率均较其它菌株高,接种后15 d 幼虫校正死亡率分别达到 94.5%、92.7%,僵虫率分别为75%、61.7%;这2 个菌株的致死中时（LT50）显著比其它菌株短,分别为 4.34 和4.52 d。绿僵菌MaFZ-13 和MaZPTR-01 菌株对油桐鹰尺蠖幼虫的致病力强,且具有良好的生产性 状,可作为该虫的生物防治资源进一步开发应用。     

美国火炬松优良家系引种试验研究

从美国引入火炬松种子园自由授粉的３３个优良家系进行引种试验。结果表明：家系间树高，胸径、单株材积生长量差异显著，经ＬＳＤ比较选择，仅有６个家系单株材积生长量优于商品种；家系前－后期树高生长相关性显著；家系的遗传力大于单株的遗传力。结果还显示，引进经人工选择的优良家系，还需经过引种区测试，并注意选择最适种源区，方能用于育种与生产。     

The dehesa: an agrosilvopastoral system of the Mediterranean region with special reference to the Sierra Morena area of Spain

A multidisciplinary team undertook a six-year investigation on the agro-ecological and socio-economic aspects of the dehesa system in the Sierra Norte area, a part of the Sierra Morena of the Sevilla Province, Western Andalusia, Spain. This paper summarizes its findings on the various agro-ecological features of the system and evaluates the system's functional aspects vis-a-vis the trends and developments in land use in the region over the past few centuries. The synergistic effects of tree cover on understorey grassland vegetation is discussed in terms of soil fertility build-up and favourable micro-climatic and hydrological features, and the potential use of this information in future research and development programmes to improve the dehesa system in the Mediterranean region is outlined.     

无瓣海桑根响应盐胁迫的转录组分析

目的 初步探究无瓣海桑的耐盐分子机制,筛选出无瓣海桑抗盐候选基因,为后续功能验证实验及林木抗盐性遗传育种奠定分子基础。 方法 以1年生无瓣海桑幼苗为材料,用500 mmol·L−1 NaCl分别处理0 d（对照组）和10 d（处理组）,取不同条件下的根部组织进行转录组测序,并结合三代全长转录组数据进行后续生物信息学分析。 结果 （1）与对照组相比,NaCl处理10 d后,无瓣海桑幼苗根系中共有14401个差异表达基因,其中,7153个上调,7248个下调。（2）GO分析发现,共有11068个差异基因在47个GO 条目得到注释。（3）在KEGG富集分析中,共有6189个差异基因富集到134条通路,其中,共有14条通路显著富集（P值<0.01,Q值＜0.05）。（4）通过进一步对差异基因进行功能注释分析,共筛选出抗盐候选基因89个,其中,抗氧化基因24个,渗透调节物质基因22个,植物激素基因19个,蛋白激酶基因10个,转录因子基因14个。 结论 活性氧清除、渗透调节、植物激素、蛋白激酶及转录因子相关基因参与调控无瓣海桑盐逆境适应过程。     

Analysis of the role of forest,biomass policy legislation and other factors that may affect the future of Kenya’s forests: Use of Japanese forestry as a model

Forests are one of the most important ecosystems on earth that require careful management, conservation, and sustainable exploitation. As countries have their own guideline systems, each may learn and borrow from one another’s experience. One of such countries is Japan, which has elaborate forest policies, and rich in forest cover (67%) with its forest history dating many years back. On the other hand, Kenya, with a forest cover of just 7% and its policies demonstrating notable weaknesses, has a lot to learn from Japan. Therefore, we have attempted to do a comparative analysis of forest policies, technologies, and management practices between Kenya and Japan. Results indicate that Kenya’s forest policies do not place adequate emphasis on silvicultural practices and the establishment of forest plantations, and rarely focus on sustainable biomass utilization—factors that contributed significantly to forest growth and development in Japan. Additionally, policy legislation, revision, and implementation have not been given the deserved priority in Kenya. We conclude that Kenyan forest policy would benefit from both revision and thorough implementation. We also discuss the role of indirect factors such as economic growth and availability of nonwood-based energy sources in the future of Kenya’s forests.     

油松受松毛虫危害后恢复能力的研究

油松经人工模拟失去一定的量的１年生针叶后对第２年高生长,针叶长度有明显的影响：失杏越多,影响越大,经２ａ后其后高生长虽仍有差异,但均可恢复到正常生长状态,而失去少量２－３年生针叶后的油松具有有补偿和超补偿效应,失去１年生针叶后油松不具有补偿和超补偿效应。     

板栗嫩枝扦插繁殖技术研究

１９９２～１９９５年共扦插１．６万株板栗插条,成苗率由１９９２年的２６％上升到１９９５年的９６．６％。试验从插条的选择、环境的控制、生根剂的选配和不同扦插时期进行了较全面的探索,现将试验结果分述如下。１材料与方法１．１试验地概况试验地设在江苏省溧阳市...