南部地区八仙花的栽培管理技术

<正>八仙花花色多样,花型硕大,观花期长,深受广大养花爱好者的喜爱。但是在养护过程中存在着这样那样的问题。因此,要正视在八仙花栽培管理过程中存在的技术缺陷。八仙花栽培管理的关键是要了解其习性以及不同生长时期的不同养护措施。通过科学养护,合理温度调节,肥水管理,可以使八仙花生长旺盛,花大色艳。     

不同时间扦插对八仙花营养生长及花芽形成的影响

该文对盆栽八仙花不同时间扦插育苗进行了试验,找出了作为促成栽培用的盆栽八仙花当年生苗最佳的扦插育苗时间为2月中旬。     

赤霉素(GA3)对八仙花花期及开花品质的影响

以八仙花为试验材料,研究了不同时间,不同浓度的赤霉素对八仙花的始花期、花径、开花数、枝长等的影响,结果表明:GA3可促进八仙花开花,浓度高开花早,可提前1-3天;250mg/L GA3明显增大八仙花花径,与对照比达到极显著水平;随着GA3浓度增加,八仙花的开花数和小花数都增加;不同时期对八仙花进行处理,也对八仙花提早开花有一定影响。对春、夏梢八仙花花期研究表明,夏梢八仙花观赏品质优于春梢八仙花,且夏梢八仙花种植周期短,更加经济,更利于广泛栽培。     

八仙花的开花调节

一、前言八仙花(Hydrangea macrophylla)原生于亚洲和南北美洲,是园林上重要的花木,其中有数种是日本产的,日本从奈良时代起就已有栽培。八仙花具有蓝色萼片组成的美丽的球状花序(八仙花美丽的着色部分不是花瓣,而是萼片),即所谓绣球型八仙花,这种类型的花在野生种中没有,绣球型八仙花的形成过程尚不明确,然而萼边型花序的数个种,例如罗马尼斯八仙花(H.macrophglla f.nomalis)、红八仙花(var.     

八仙花无土盆栽技术

八仙花(Hydrangea macrophylla)为虎耳草科八仙花属观赏灌木,盆栽品种高度30-40 cm左右,有红、白、粉、蓝等花色, 自然花期5—8月。近几年,随着促成栽培等技术研究的深入,八仙花已成为我国五一、元旦、春节等节日期间用花的重     

八仙花花期调控影响因素研究

就影响盆栽八仙花促成栽培花期和品质的因素进行了研究和探讨,试验结果认为选择早花品种及2 a生苗龄是保证准确调控促成栽培花期的关键;其次种苗的营养状况、花芽分化的状态、不同品种的低温需冷量及催花期的温度和光照是影响八仙花促成栽培花期和品质的重要因素。不同品种所需低温量为Leuchtfeuer(红色)44 d,Lavbla(蓝色)和Adria(粉色)37 d,Snowball(白色)30 d。为缩短八仙花冷藏周期,为促成栽培后期提供足够的生长时间,保证定时、准确上市提供参考。     

八仙花的应用及研究进展

指出了八仙花是一种具有很高观赏价值的夏季花卉,并且具有悠久的种植历史,近些年更是受到人们的喜爱和追捧,在国内外逐渐增加了在园艺方面的应用。八仙花含有异香豆素及其衍生物、环烯醚萜等多种化学成分,能抗过敏、治疟疾,也是一种传统中药,具有很高的药用价值。对八仙花的国内外应用、组织培养、化学成分分析、栽培管理等方面的研究进行了综述,旨在为八仙花的应用和研究提供理论依据和指导。     

八仙花的栽培技术

八仙花又名草绣球、阴绣球、绣球花、七变花、紫阳花等，为虎耳草科八仙花属的观赏灌木，单叶对生，大而有光泽，倒卵形至椭圆形，长7—20厘米，缘有锯齿：伞房花序顶生，近球形，花有白色、粉红色、蓝紫色，几乎全部为不孕花，自然花期5-7月，栽培中花期可延续到下霜，促成栽培可在元旦、春节上市。     

大青山的野生花卉

大青山的野生花卉华雨石大青山是阴山山脉最主要的部分，平均海拔约１８００～２０００米，最高峰２３３８米，植被为典型草原类型，有种子植物近千种，其中一些野生花卉美丽动人，可以引种栽培。一、东陵八仙花虎耳草科八仙花属中生灌木。高１～３米，单叶对生，叶椭圆形...     

不同配比基质对3个八仙花品种根系生长的影响

以2年生红花八仙花、花叶八仙花、粉花八仙花为实验材料,研究3个品种在不同配比基质扦插生根与移栽后的生长响应,结果表明:3个八仙花品种扦插在东北泥炭:珍珠岩:蛭石=5∶3∶2的基质中生根速度最快。移栽后东北泥炭:珍珠岩:蛭石=5∶3∶2最利于红花八仙花的根系生长;东北泥炭:珍珠岩:蛭石=4∶2∶2最有利于花叶八仙花的根系生长;东北泥炭:珍珠岩:蛭石=2∶3∶3最有利于粉花八仙花的根系生长。     

江西省峡江县城市森林建设规划

以江西省峡江县城市森林为研究对象,通过对城市森林数量、布局等现状的调查和分析,提出了峡江县城市森林建设总体规划目标、总体布局以及建设内容。研究结果表明:按照规划实施,至2020年峡江县城市森林覆盖率将由2010年的60.5%升至68.0%,建成区绿地率由44.6%升至49.7%,建成区绿化覆盖率由49.9%升至53.2%,人均公共绿地面积由12.2m2升至15m2,城市森林生态效益将得到更大发挥,城市生态环境质量将显著提高。该规划的研究成果也将为其他县级城市森林建设规划提供参考。       

林木低磷胁迫适应机制研究进展

土壤有效磷缺乏在自然环境中是一种非常普遍的现象,近年来世界各国针对植物的觅磷和耐磷机制进行了大量研究,然而目前相关的综述性报道多限于农作物,对林木低磷胁迫适应性的综述性报道尚不多见。在长期进化过程中,林木为利用土壤中现有的含量极低的有效磷,形成了各种适应低磷胁迫的机制。文中从林木根系的形态学变化、根系分泌物对土壤难溶性磷的活化作用、林木对土壤低浓度有效磷的吸收利用以及应对低磷胁迫的遗传调控等方面综述了低磷环境中林木的适应机制,为揭示林木对缺磷环境的适应机理、发掘林木自身对土壤有效磷高效率的吸收利用能力、以及进一步筛选林木的磷高效品种和合理经营管理人工林提供参考。     

深翻施肥促进杉木生长的效果研究

研究认为：对杉木施肥以中龄林为佳Ⅰ、Ⅱ类地林分施肥效果比Ⅲ类地好；对幼林施肥以Ⅱ、Ⅲ类地施肥效果比1类地好；深翻抚育时间选择幼龄时期为佳。     

Estimating “autotrophic” belowground respiration in spruce and beech forests: decreases following girdling

Seasonal fluxes of CO₂ from soil and the contribution of autotrophic (root + mycorrhizal) to total soil respiration (SR) were estimated for a mixed stand of European beech (Fagus sylvatica) and Norway spruce (Picea abies) in Central Europe. Mature trees of each species were girdled in August 2002 to eliminate carbohydrate allocation to roots. SR was measured at distances of 0.5, 1.0, and 1.5/2.0 m from the bole of each tree at 1–2 weeks intervals throughout the fall of 2002 and monthly during the spring and summer of 2003. The contribution of roots and mycorrhizae to total SR was estimated by the decrease in SR compared to ungirdled control trees to account for seasonal patterns evident in controls. SR decreased with soil temperature in the fall 2002 and increased again in 2003 as soil warmed. During most of the study period, SR was strongly related to soil temperature. During the dry summer of 2003, however, SR appeared to be uncoupled from temperature and was strongly related to soil water content (SWC). Mean rates of SR in beech and spruce control plots as well as root densities did not show a clear pattern with distance from the bole. SR decreased to levels below controls in beech within a few days after girdling, whereas spruce did not show a significant decrease until October 2002, 6 weeks after girdling. In both beech and spruce, decreased SR in response to girdling was greatest closest to the bole, possibly reflecting increased mycorrhizal activity close to the bole. Autotrophic respiration was estimated in beech to be as much as 50% of the total SR in the stand. The contribution of autotrophic respiration was less certain for spruce, although close to the bole, the autotrophic fraction may contribute to total SR as much as in beech. The large fraction of autotrophic respiration in total SR requires better understanding of tree level stresses that affect carbon allocation below ground.     

An AHP Assessment Of Barriers in Adopting Sustainable Forest Management Practices in The Context Of Carbon Emission Reductions in Cameroon

ABSTRACT

As the role of forests in climate change mitigation is explicitly recognized in the Paris Agreement, the need to enhance the adoption of Sustainable Forest Management (SFM) practices is crucial. Therefore, this paper aims at identifying and evaluating barriers in adopting SFM practices in the context of forest carbon emission reductions. A total of 15 barriers in adopting SFM practices are listed through literature and expert inputs. Using Cameroon as a case study, the listed barriers are then evaluated by experts to determine their relative importance using the Analytical Hierarchy Process (AHP) method. According to our findings, the ‘Regulatory and Legislative frameworks’ barrier category was attributed to the highest importance among other categories, in adopting SFM practices in the forestry sector. ‘Inadequate political will and incentive to enforce regulations’ appears to be the major obstacle in adopting SFM practices in Cameroon. As carbon emission reduction initiatives are being developed, there is need to move from broad to concrete suggestions that will overcome these barriers. However, proper diagnosis is necessary in order to target barriers with the right incentives and enabling conditions that will support carbon programs and projects to deliver effective emission reductions.     

通过RNAi技术抑制杨树c3h基因表达提高糖转化效率

利用克隆得到的毛白杨c3h1基因构建其RNAi抑制表达载体,通过根癌农杆菌介导的叶盘法转化银腺杨无性系84 K,Realtime PCR检测表明其转基因株系323、325和322中c3h1基因表达量较野生型植株分别下调89.04%、82.22%和68.38%;茎横切片组化染色和显微结构观察表明转基因植株木质部发育和木质素沉积方式发生了改变;木质素、纤维素含量测定及苯酚—硫酸法总糖含量与HPLC法可溶性总糖和单糖含量检测结果表明:转基因植株木质素含量平均降低23.00%,最高可达39.71%;酸前处理效率最高提高了41.39%;未经酸处理直接酶解的糖化效率是对照植株的2.34～2.72倍,322株系和323株系比对照植株经酸前处理后再酶解的糖化效率高出81.18%和375.53%。     

关于林业重点工程建设科技支撑的构想

论述了林业重点工程建设科技支撑的由来,提出了林业重点工程建设科技支撑的构想、对策及措施。笔者认为:必须深化改革,建立重点工程建设科技支撑的运行机制;依靠科技进步,为林业重点工程建设提供全面的科技支撑;建立多元化投入机制,增加重点工程建设科技支撑的投入;加强对重点工程科技支撑工作的管理与监督,建立激励机制。     

Management Strategies and Research Orientations of Forest Diseases and Pests in China

Forest diseases and pests are perceived as a growing hazard to China economy. It is a common conclusion that the actualities of forest pests in china are no effective measures to the old important pests, some secondary pests are ascending to chief pests, increasing devastation from exotic pests, frequent ecological pest eruption induced by environmental detriment and host-leading diseases to threaten the "Western Development Project "in China, which is the most important economical strategy to China; that inducement of current forest pests results from ecological function loss and dangerous exoticpest intruding, On the basis of these cognitions, we suggest that strategies of management pests to natural forest would be stressed to maintain its innate capacities to adjust pests in virgin forest and resume such function in intermpted one, that to artificial forest would establish self-control in afforestated stands and develop resistant tree varieties and species, especially those in landscape trees. In re     

唐山市采煤塌陷区湿地生物多样性调查及评价

湿地生物多样性评价是生物多样性保护和实现可持续发展的基础性工作,本研究采用全面调查、样地设置等多种方法对物种进行调查,运用物种多样性和生态系统多样性的指标体系对唐山市采煤塌陷区湿地生物多样性进行较全面的评价。