赤桉种源生长适应性,抗逆性及其遗传稳定性研究

对赤桉４批试验林４２个种源４￣８年生幼林的生长适应性，抗逆性及其遗传稳定性进行分析研究结果。     

Bulk method of hardwood cutting propagation ofLarix olgensis

Larix olgensis is a major reforestation species in areas of the northeast part of China. Rooted cutting for vegetative propagation on this Larch has been carried out since 1990, and later the bulk method of hardwood cutting propagation also has been studied. The result is as follows: (1) Cuttings from physiologically juvenile trees are easy to root, and develop better roots. In addition, there are many methods to enhance the cuttings rooting. (2) The good time for seedling transplanting is in the middle of August. Treatments with plant hormones and rare-earth compounds can improve the seedling survival rate, and the survival rate of the seedlings soaked in chelate rare-earth molybdenum compound (300×10⁻⁶) for 3 hours reached 94.00%, 19.49% higher than that of the control. (3) Methods of maintaining juvenility such as hedging, is essential to further developments for operational planting of vegetative propagates. Hedges in 5 years old can produce 91.75 shoots per tree, exceeding the control to 152.2%. (Responsible Editor: Zhu Hong)     

武义牛头山区珍稀濒危植物资源调查

报道了浙江省武义县牛头山区珍稀濒危植物13种，其中国家级7种，省级6种；同时又发现其中7种为武义分布新纪录。对区内珍稀濒危植物的分布、现状及保护价值等进行了论述，并提出了保护意见。     

液培杉木苗根系分泌性能的初步研究

对１年生杉木苗培养液的ｐＨ、电导率和有机碳含量的测定表明：经过杉木苗培养后的各营养液的ｐＨ均有下降趋势，其中以硝态氮营养液下降幅度最大（下降１．７２），其次是缺锌营养液（下降１．６８），最小为缺磷营养液。各种营养液的电导率变化较复杂，缺磷、缺锌和对照处理电导率增大，而硝态氮、混合氮和缺铁处理下降。杉木苗分泌有机碳以对照组最多，缺铁培养的分泌最少。     

速生杨树无性系丰产育苗技术研究

将筛选出的JP15、JP13和JP7共3个杨树无性系进行育苗试验，结果看出：①3个杨树无性系其生长期均比对照长1～2个月；②扦插成活率除JP7较差外、JP15与JP13均高于对照，达95％以上；③在育苗密度上，以40cm×60cm为最好，不仅苗木整齐，且壮苗合格率达80％以上。在试验基础上，总结出一套杨树快繁技术措施。     

棕榈藤组培苗移植技术研究

本文研究了黄藤、短叶省藤、单叶省藤、白藤和异株藤组培苗的移植技术。结果显示：试管苗的质量是移植成活与否的关键，适宜的组培苗移植规格为：苗高大于４．０ｃｍ根长大于４．０ｃｍ，带须根；珍珠岩为最优移植介质，移植组培苗的根系生长量大、净 条烽多、成活率最高，分别达２６．１ｃｍ／株、０．８条／株、９５．０％；泥炭土和细沙中选介质，移植成活率〉９０％；最佳的练苗介质配比为４０％泥炭土＋６０％黄心土，移植成活     

乌桕优良无性系评选及可配性研究

对收集的２０个乌桕无性系的生物学特性，主要经济性状进行了观测和比较，经多年测产，评选出８个高产无性系，并进行了可配性试验，用无性系造林，宜选择葡萄桕（类型）混合种植。     

EFFECTIVENESS OF ACEPHATE IMPLANTS IN PROTECTING CONES FROM INSECT DAMAGE IN SOME CONIFERFORESTS OF NORTHEASTERN CHINA

lNTRoDUCTloNInChina,onlyafewexperimentshavebeenperfbrmedtotestinsecticidessusceptibletopreventconesandseedsfrominsectdamage(Anonymousl986,GaoBuquetal.l99l,YueShukuil992,LiuYikong1993).Moreover,thesetestsonlyconsistedofsprayingchemi-cals,thatmayinduceharInfulconsequencesuponenvironment.TheintensifiedeffoftofafforestationinNortleasternChinarecentlyrequiredtoestablishlnyenumbersofseedorchards,aswellasparent-trCestands,inordertoprovideforesterswithhigh-qualityseeds,especiallyinlarch.Thispr…     

江西油茶产业发展优势及对策分析

油茶是我国最重要的经济林资源之一,具有东方橄榄油之称。目前,国家主张大力发展油茶产业,并给予相应的政策扶持,调动了社会各界参与油茶经营开发的积极性。笔者综述了江西油茶产业发展的优势,并针对其优势、现状提出了油茶产业的发展对策,以促进江西油茶产业更好地发展。     

红松、刺楸人工针阔混交林物种多样性研究

通过对红松、刺楸人工混交林,红松纯林物种多样性的研究,结果表明,红松、刺楸混交林物种丰富度最大,植物种类最多,红松纯林仅为混交林的43%,总数量为混交林的32%,红松、刺楸混交林乔木层多样性指数为1.430 5,均匀度指数为0.687 9,优势度指数为0.290 6,丰富度指数为1.413 7,而红松纯林多样性指数、均匀度指数均为0,优势度指数为1,丰富度指数为0.371 2。在灌木层中,混交林与纯林各项指标区别不大,只有丰富度指数为混交林(纯林。在草本层中,混交林各项指数基本都大于纯林,只有均匀度指数红松纯林(混交林。