常绿大树移栽的关键技术

阐述了大树移栽的重要性以及常绿大树要确保移栽成活务必全面抓好移栽前准备、挖树与包装、装卸与运输、适时合理栽植、移栽后养护等几项关键技术，仅供参考。     

提高大树移栽成活率的对策

分析了影响大树移栽成活率的主要因素，并从起苗运输、树冠修剪、生长素使用、栽植环境消毒、移栽季节选择以及移栽后水分管理等方面提出了提高大树移栽成活率的对策。     

银杏大树移栽技术要点

银杏作为我国特有的观赏经济林木 ,其胸径 15cm以上的大树移栽已经成为城市绿化、园林栽植和疏密扩面的经常性工作 ,如何提高大树引进、栽植的成活率 ,直接关系到生态效益、景观效果和经济效益。近年来 ,我们采取相应的技术措施 ,使移栽成活率提高了 2 3.8% ,技术要点如下 :1　移栽时间落叶至翌年春萌芽前都可以进行 ,最好在落叶后至封冻前移栽。此时地温尚高 ,利于移栽树木根系的愈合 ;树木进入休眠期后 ,树木新陈代谢基本停止 ,大树经历了冬眠 ,生理代谢趋于复苏易成活。2　移栽方法2 .1　切根措施需移栽的大树 ,9月中下旬需进行切根处理…     

几种绿化树种大树移栽技术

介绍了香樟，桂花，枫香，银杏4个树种的大树移栽技术，通过各项技术的综合利用，不但能保证大树的移栽成活率，而且在高温天气也能够栽大树。     

城市园林绿化过程中的大树移栽技术

根据大树的生长特性，对大树移栽中的选种，截根促根，冠部处理，移栽时间，采挖处理及栽后管理等成功经验做了详尽的介绍。     

大树移栽技术

大树移栽技术扬州大学水利学院蒋向中用大树移栽具有成型早，绿化效果明显的优点，特别是对于一些新建单位或绿化基础较差的单位，更能起到立竿见影的效果。但由于大树移栽的技术要求高，难度大，在实际应用中受到了一定的限制。为了提高大树移栽的成活率，笔者在近几年的...     

大树移栽技术

随着城市园林绿化事业的快速发展,大树移植的数量越来越多。从大树移栽的原理、移栽时间、移栽前的准备工作、移栽技术措施以及移栽后的管护等方面介绍了大树移栽技术。     

香樟大树移植技术

为了增加动物园在盛夏季节的绿荫地 ,移植了胸径为 2 0～ 30cm的香樟大树 112株 ,成活率达 93%。该文具体介绍了香樟大树移栽前的准备 ,移栽和管护技术 ,分析了未成活植株的死亡原因     

园林工程中夏季大树移植栽培技术

对夏季大树移栽的技术及其原理进行了综述，探讨了夏季大树移栽确保成活率的优良方法。     

大五星枇杷大树移栽及引种试验

大五星枇杷大树移栽试验表明,移栽前进行诱根处理,移植园地选择地下水位较低、土壤较肥沃的旱土,地下水位较高的水田移栽时,应用客土抽沟排水或非客土抽沟排水,适当的轻度疏删和回缩修剪,有利于提高枇杷大树移栽的成活率和树势的恢复,也有利于大五星枇杷的提前投产.引种试验结果表明,大五星枇杷在湖南株洲地区能正常生长、开花结果,丰产稳产,适应性强,成熟期比原产地早8～12 d.在栽培管理良好的条件下,大五星枇杷大树移栽2 a后株产可达5 kg,3 a生树株产10～15 kg,在控制产量、适度疏果的前提下,大五星枇杷可保持原产地大果质优的特性.     

龙陵县核桃丰产栽培技术实验示范研究

针对龙陵县部分核桃树老化、中幼树低产及新植技术缺乏的难题,结合龙陵县规划改造和新植任务的实际,对核桃老树更新复状、低产园改造及新植技术分年度进行了丰产栽培实验示范研究,建设核桃新植示范点10个,总结出核桃新植"十个一"技术,使新植桃核的成活率及保存率明显提高,可提前3年挂果进入收益期;通过核桃示范点与传统种植对比分析以及核桃更新复壮前后和核桃低产园改造前后对比分析,结果表明,核桃衰老树更新复壮和低产中幼树改造技术,使树势明显恢复,病虫鼠害明显减少,能促进增产增收,达到高产稳产,经济效益明显,是核桃老区和低产区快速发展核桃产业的有效方法。     

台江采育场竹木混交林丰产措施试验

对台江林业采育场现有竹木混交林进行施肥和土壤垦复两种试验，结果表明，不同施肥处理虽有一定增产效果，但经方差分析未达到显著水平；不同土壤垦复措施的增产效果，以深翻加施肥的新竹产量最高，锄草松土居第二，单纯深翻并不理想，效果不如劈山抚育。因而，新兴竹木混交林应以调整竹林结构和护笋养竹为主，每年锄草松土即可达到材用丰产林标准，不宜盲目深翻、施肥。     

北京城市常用绿化树种根系再生能力调查

大规格苗木移植时使大量根系受到伤害,导致树木根系吸收的水分与地上部蒸腾失水之间的平衡被打破。因此,大树迅速生长出新的吸收根,快速恢复树木体内水分平衡,对提高大树移植成活率起着重要的作用。对北京地区城市绿化中常用的36个树种移植后树木根系再生情况进行了调查,根据断根处能否生出新的根系和新生根系的数量来划分根系再生能力。调查结果表明,国槐、栾树、暴马丁香等树种的根系再生能力较强,雪松、玉兰等树种的根系再生能力一般,而银杏、小叶朴等树种根系再生能力较弱。     

Transgenic woody plants for biofuel

Transgenic trees as a new source for biofuel have brought a great interest in tree biotechnology. Genetically modifying forest trees for ethanol production have advantages in technical challenges, costs, environmental concerns, and financial problems over some of crops. Genetic engineering of forest trees can be used to reduce the level of lignin, to produce the fast-growing trees, to develop trees with higher cellulose, and to allow the trees to be grown more widely. Trees can establish themselves in the field with less care of farmers, compared to most of crops. Transgenic crops as a new source for biofuel have been recently reviewed in several reviews. Here, we overview transgenic woody plants as a new source for biofuel including genetically modified woody plants and environment; main focus of woody plants genetic modifications; solar to chemical energy transfer; cellulose biosynthesis; lignin biosynthesis; and cellulosic ethanol as biofuel.     

四倍体刺槐生态饲料林栽培试验

四倍体刺槐是近几年培育成功的刺槐新品种,它不但保持了普通刺槐的原有属性,同时又具有很多新的特性.通过对四倍体刺槐生态饲料林栽培技术的试验研究,结果表明,不同定植密度对苗木成活率无显著影响,但对采割量影响显著.以每667 m2定植3 300株枝条采割量最大;四倍体刺槐2号和5号与普通刺槐相比,粗纤维和粗蛋白含量高,灰分含...     

早酥梨叶枯病危害损失与防治指标研究

梨叶枯病是在早酥梨上发现的一种新病害，病原菌为Ｍｙｃｏｖｅｌｌｏｓｉｅｌｌａ ｐｙｒｉｃｏｌａ。通过调查早酥梨叶枯病在田间的消长动态，实测不同病情指数下１年生早酥梨苗的高、粗生长量、７－８年生结果树平均单果重、单株产量，建立了苗期生长量和结果树产量损失估计模型，推算出该病害防治指标病指苗期为１２．７４％，结果树为１３．８４％。     

Growth of young apple trees in relation to reserve nitrogen and carbohydrates

Bench-grafted Fuji/M.26 apple (Malus domestica Borkh.) trees were fertilized with a nutrient solution (fertigation) containing 0, 2.5, 5, 7.5, 10, 15 or 20 mM nitrogen (N) in a modified Hoagland's solution from June 30 to September 1. In mid-October, half of the trees in each N treatment were sprayed twice with 3% urea, 1 week apart. The remaining trees served as controls. All trees were harvested after leaf fall and stored at 2 degrees C over winter. One group of trees from each treatment was destructively sampled before bud break to determine amounts of reserve N and total nonstructural carbohydrates (TNC); the remaining trees were transplanted to N-free medium in the spring. These trees were supplied with Hoagland's solution with or without 10 mM N (from 15N-depleted NH4NO3) for 60 days, starting from bud break. With increasing N supply from fertigation, tree N concentration increased, whereas TNC concentration decreased. Foliar urea applications increased tree N concentration and decreased TNC concentration in each N fertigation treatment. There was a negative linear relationship between tree N concentration and TNC concentration. Irrespective of whether N was provided the following spring, trees with high N reserves but low carbohydrate reserves produced a larger total leaf area at the end of the regrowth period than trees with low N reserves but high carbohydrate reserves. The pooled data on reserve N used for new growth showed that, regardless of the spring N supply, there was a linear relationship between total N accumulated in the tree during the previous season and the amount of reserve N remobilized for new shoot and leaf growth. About 50% of tree N content was remobilized to support new shoot and leaf growth over the range of tree N status examined. We conclude that the initial growth of young apple trees in the spring is determined mainly by reserve N, not reserve carbohydrates. The amount of reserve N remobilized for new growth in spring was proportional to tree N status and was unaffected by current N supply.     

Growing situation of afforested trees and damage to lower-story trees caused by felling in multi-storied forest management in Peninsular Malaysia

The growing condition of afforestation trees and damage to lower-story trees caused by felling and hauling of upper-story trees in a multi-storied forest in Peninsular Malaysia was surveyed. Seventy months have passed since the planting ofAcacia mangium upperstory trees, which have grown 233 m³/ha in volume. The growth ofShorea leprosula thirty-five months after planting of lower-story trees have reached 5.54 m in height. However, as the ratio of height to basal diameter exceeds 100:1, trees are tapering to a considerable degree. A backhoe was installed in order to fell the upper-story trees. From the results of logging, the damage ratio estimation of the lower-story trees was simulated by using the Monte Carlo method. The damage ratio differed considerably depending on planting patterns, height of upper-story trees and felling skills. The results of this survey proved that the felling and hauling of upper-story trees would be technically feasible in the future, except when one row upper-story trees and one row lower-story trees method were employed.     

Genomics and the tree physiologist

During the last decade, a strong case has been made for viewing trees as model systems in plant biology. More recently, forest biologists have argued for the sequencing of the genome of a forest tree. Now, the United States Department of Energy has announced plans for sequencing the genome of the Populus trichocarpa clone, "Nisqually-1." Thus, forest biology is poised to enter an exciting period of scientific discovery. Embracing new technology and new research paradigms, however, is never easy. It is, therefore, timely to ask how tree physiologists will take advantage of the Populus genome data. We contend that the most attractive opportunities will arise through genome-wide research designed to: (1). examine the differences between trees and herbaceous annuals; (2). explore questions relating to the temporal and spatial scales that characterize the life histories and growth of trees; and (3). investigate cause-and-effect relationships that are intractable to conventional research methodologies. To highlight the potential applications of genomics in tree physiology, we briefly discuss each of these approaches.     

《江西省森林资源转让条例》对促进林木林地流转的成效分析

《江西省森林资源转让条例》的颁布实施活跃了江西省的林木林地转让交易,推动了林木林地的资产化、产业化经营,增加了林农的收入。但随着林业产权制度改革的深入,一些新的问题还有待于进一步明确。本文对《条例》促进林木林地流转的成效及有关问题进行分析,并提出相关的建议。