低温预处理对刺槐种子活力和幼苗生长的影响

采用低温（3～5℃）预处理刺槐种子能显著提高种子的萌发率和萌芽活力，其中以处理5d的效果最好。经低温处理的种子发芽时问缩短．发芽高峰出现的早，发芽指数和活力指数均明显高于对照；质膜透性减弱，外渗液电导率降低；幼苗的逐日生长量大、平均生长量较对照高。表明种子萌发前经低温预处理能有效提高种子活力水平，有利于好苗、壮苗的形成。     

不同包衣剂对棉花种子萌发及幼苗生长的影响

用不同的棉花型包衣剂和玉米型包衣剂处理棉花种子,选择2种温度条件进对其进行培养,测定发芽率、幼苗长度和幼苗重量,研究不同包衣剂对棉花种子萌发及幼苗的影响.试验结果表明,经过包衣剂处理的棉花种子在发芽率和幼苗的生长状况上均优于未处理的种子,对棉花型包衣剂成分进行调整,能有效影响棉花早期的生长.     

模拟林窗光照条件对南亚热带雨林土壤种子库幼苗萌发的影响

2002～2003年研究了模拟林窗光照条件对福建南靖和溪南亚热带雨林土壤种子库幼苗萌发的影响.结果显示:和溪南亚热带雨林土壤种子库萌发的乔灌木及木质藤本幼苗的种类有43种,其优势成分香楠(Randia canthioides)、三叉苦(Euodia lepta)、山油麻(Trema dielsiana)、山黄麻(Trema orientalis)、楤木(Aralia chinensis)等为先锋物种,杜茎山(Maesa japonica)为林下植物,榕属植物(Ficus)生态位较独特.在数量上,春季最高(1 391株/m2),秋季次之(1 116株/m2),夏季(940株/m2)和冬季(930株/m2)最低;在垂直分布上,土壤种子库0～2 cm与2～5 cm两个层次在种类组成上是一致的,对于同个物种一般上层数量明显高于下层;在出苗顺序上,各物种在不同季节的出苗顺序基本一致,白楸(Mallotuspaniculatus)、三叉苦、山黄麻、盐肤木(Rhus chinensis)、山乌桕(Sapium discolor)、楤木等植物一般在萌发实验开始的早期出苗,香楠、笔管榕(Ficus virens)、凸脉榕(Ficus nervosa)、山油麻、黄毛榕(Ficus fulva)、玉叶金花(Psychotriapubescens)、野牡丹(Melastoma candidum)等在中期和晚期出苗,杜茎山、拟赤杨(Alniphyllum fortunei)、雅榕(Ficus concinna)、红栲(Castanopsis hystrix)等一般在萌发实验晚期出苗.     

樱桃试管苗叶片气孔观察初报

以樱桃试管苗叶片为材料，初步研究了其气孔的物理特性，研究结果表明其叶片的密度含叶脉面积为57．25个／mm2，不含叶脉面积是为61．65个／mm2；气孔长度为3．14um，宽度为2．48um。     

矮密丰枣树的栽培管理

文章从实际出发，就山西省适宜栽培的枣树品种及矮密丰枣树经济林的育苗、栽培管理、实用技术进行了简要介绍。     

The effects of microfilament and microtubule inhibitors and periodic electrical impulses on phloem transport in pea seedling

In phloem transport, whether protoplasmic activity participates in assisting sap flow in sieve element-companion cell complcx hils long been in debate. The prcsent investigation assumcd microfilament (MF) and microtubule (MT), the two constituents of the protoplasmic cytoskeleton, as motive force, and employed germinating pea seedling suspended in moist chamber as experinental material: thc seed being the source; the elongating root, the sink.¹⁴C-labeled sucrose was added to the seed as indicator. The amount of sap transported from source to sink was measured by the increase in root elongation. The transport phloem was within the cylinder of the peclcd root in thc middle. The exposed cylinder was treated with MF inhibitor (cytochalasin B), or microtubule inhibitor (amiphosmethyl). Results showed that the sap influx into the elongating root. and the¹⁴C activity as well, was reduced by abut one half in treatrrrent with cytochaliisin B, and much less by amiphos-methyl treatment. Similar effect was shown in clcctrical impulse Ireatnimt, which scems to disrupt the MF and MT configuration.     

Fractal analysis for root growth of plant seedlings under doubled CO2 concentration

Fractal geometry was applied and box dimension was used as an indicator to analyze the effects of doubled CO₂ concentration on the root growth of plant seedlings. Results showed that doubled CO₂ concentration displayed different effects on root branching characteristics of C₃ and C₄ plants. There was an obvious increase of root branches in spring wheat while there were no significant effects on roots of sweet sorghum. In different soil layers, root branching of spring wheat was stimulated and this promotion was most significant in the second layer (10–20 cm), which denoted that elevated CO₂ altered the root branching pattern. That means higher CO₂ concentration influences not only root growth but also its differentiation and development.     

聚乙二醇和聚乙烯醇渗调处理对苜蓿幼苗抗冷害的影响

经聚乙二醇（ＰＥＧ）和聚乙烯醇（ＰＶＡ）渗调处理的苜蓿种子不但发芽率高于对照组,而且幼苗的抗冷害能力也得到提高。两种渗透调节剂提高了苜蓿幼苗子叶的过氧化物酶（ＰＯＤ）、过氧化氢酶（ＣＡＴ）和超氧物歧化酶（ＳＯＤ）的活性,降低了丙二醛（ＭＤＡ）的积累水平和电解质渗漏的程度,说明聚乙二醇和聚乙烯醇渗调处理不但可以缓解低温吸胀对种子的伤害,而且还提高了幼苗抗冷害能力。     

红壤中菌根对柑桔磷肥效应的研究

取第四纪红壤,接种VA菌根真菌(Glomus citricolum)于枳(P(?)ncirus trif(?)liata)实生苗,以不接种为对照,各施用6种磷肥量,共12个处理.1987年和1988年两年重复的盆栽试验证明:(1)在红壤中枳的菌根发育良好,接种菌根真菌4个月后,检查枳实生苗的菌根感染率为30%左右,高的可达39.0%;(2)在红壤中每亩施25—125kg不同量的过磷酸钙对无菌粮枳实生苗的生长效应不明显,而接种菌根真菌后则能显著地促进枳实生苗的生长.4个月中,有菌根枳苗的株高比对照的增长1倍,主干粗度增40%-93%,植株鲜重增3—6倍;(3)菌根使枳苗地上部含磷量比对照多3—5倍;(4)土壤在不灭菌条件下,接种菌根真菌也有一定的效果.     

辽宁林业容器育苗发展问题的研究

阐述了我省林业容器育苗的发展历史、现状和取得的成就，也对容器育苗存在的问题和今后发展的趋势进行了归纳和研究，同时提出了今后容器育苗工作加快实现容器育苗机械化、工厂化、现代化、自动化的措施。