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城市园林植物病虫害的防治方法很多,从可持续环境建设的需要,全面考虑生态平衡、经济效益和防治效果,对园林植物病虫害绿色防治技术途径进行了探讨。 相似文献
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通过对郑州市创建国家园林城市工作的回顾和总结,结合作者十余年的城市园林植物病虫害预测预报及城市园林植保科研、生产工作实践,提出了城市园林绿化植物病虫害生态综合治理的系列技术方案。方案虽然有待进一步完善,但是愿意抛砖引玉、与各位园林同仁共同探讨,为创建和谐社会中的城市园林植保工作贡献绵薄之力。 相似文献
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郑州市园林病虫害防治存在问题及建议 总被引:2,自引:0,他引:2
随着城市建设的不断发展 ,郑州市绿地面积不断增加 ,植物种类越来越丰富 ,同时病虫害的防治任务也越来越重。虽然防治工作取得了一些成绩 ,但由于诸多因素的影响 ,城市园林病虫害防治工作仍存在一些问题 ,严重影响了防治效果。根据外地经验 ,结合实践体会 ,就郑州市病虫害防治工作提出几点意见。1 目前病虫害防治工作存在的问题1 1 缺乏完整的病虫害测报体系虽然我市各绿化部门都配备专职技术人员负责病虫害防治工作 ,但没有形成一个比较完整的测报体系 ,更没有先进技术在测报工作中应用 ,如红外线遥感、计算机等 ,使测报成为防治工作的… 相似文献
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城市园林绿化有害生物的无公害防治技术 总被引:2,自引:0,他引:2
该文概述了城市园林有害生物无公害防治的现状、基本内涵及技术特点,总结了生产实践中广泛应用的有害生物无公害防治的实用技术。综合运用有关方法和技术,对维护和保障城市生态系统的稳定和城镇居民的健康,大有裨益。 相似文献
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园林树木是城市绿化中非常重要的物质基础。分析了城市园林树木常见病虫害的基本属性,分析了现有园林树木病虫害防治制度的缺陷,总结了有效防治园林树木病虫害、促进树木健康生长的技术措施。 相似文献
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森林病虫害防治是国家减灾工程的重要组成部分,对保护森林资源,改善生态环境,促进国民经济和社会可持续发展具有十分重要的意义。 相似文献
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我国桉树木材性质及其变异规律研究进展 总被引:1,自引:0,他引:1
概述了国内桉树木材解剖性质、物理力学性质、化学性质及其变异规律的研究现状,对桉树木材性质变异的影响因子及其材性遗传相关性研究进行了总结,最后分析其存在的问题,并展望了桉树材性遗传改良的研究前景。 相似文献
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D. G. Hunt 《Wood Science and Technology》1989,23(4):323-333
Summary Non-linearity of softwood in axial mechano-sorptive creep during moisture cycling can be characterised as departure from linear behaviour. Linear behaviour is shown by experimental measurement to be a gradual approach to a creep limit with exponentially decreasing increments of compliance, Ji, per moisture cycle, when tested under a constant stress. On the other hand, when the stress is progressively increased by a small increment after each moisture cycle, the compliance increments will progressively increase, having a value of
, where n is the cycle number. By subtracting one compliance increment from the succeeding one, the value of Ji can be obtained. Analysis of experimental results in bending tension and compression showed that the compression test pieces departed from linearity at total strains around 0.14% to 0.15%, the bending test pieces showed slight evidence of non-linearity at about the same strain, whilst the tensile pieces were approximately linear up to 0.18% strain.This project was supported by the U.K. Science and Engineering Research Council and by the European Commission 相似文献
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文章简要地分析了围垦湖沼、上游截流、过度利用及工艺技术落后等人为因素对湿地资源的破坏情况与负面影响,给人们赖以生存的湿地生态环境带来严重的不可逆转的后果,并有针对性地提出了几点建议。 相似文献
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以德国南部小城镇加米施-帕滕基兴(Garmisch-Partenkirchen)市为例,在介绍该市园林绿化概况的基础上,重点介绍其民居庭院绿化与阳台绿化的特色;并对如何更好地发展中国小城镇绿化进行了探讨。
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The composition of the endophytic fungal assemblages in Quercus cerris, Q. pubescens and Q. robur, three oak species most susceptible to decline, was investigated in Fagarè (Padova), Ulignano (Pisa), and Radda in Chianti (Firenze). The endophytic assemblages were studied as a function of health status of the whole tree and of twigs and leaves. The effect of station altitude was tested on Q. cerris. Samples were gathered from healthy and declining trees. In April (bud opening time) 20 twigs and 10 leaves were collected from each tree. Fungi were isolated from twig segments and leaf portions. A total of 23 fungal genera with 27 different species were isolated, in addition to a few sterile mycelia. Eleven species were found to be common to all three oak species, while other species were found only on one oak species, suggesting host specificity. Among the fungal species isolated, some were known to be pathogenic (Apiognomonia quercina, Colpoma quercinum, Diplodia mutila, Phomopsis quercina). The colonization frequency (CF) of pathogenic species varied between 0.9% for A. quercina in Q. cerris and 60.2% for P. quercina in Q. robur. Analysis of variance showed a statistically significant difference among the oak species tested. The CF was higher in declining trees in comparison with healthy trees, and also in twigs vs. leaves. The CF was found to be higher for Q. cerris trees growing at sea level as compared with those situated at an elevation of 350–400 m. In stands where, on account of particular ecological conditions, pathogenic behaviour is displayed simultaneously by more than one endophytic fungal species, trees accentuate their decline. 相似文献
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园林植物病虫害发生特点与防治进展 总被引:7,自引:0,他引:7
本文从园林植物病虫害防治的重要性入手,分析了园林植物病虫害的特点,指出了园林植物病虫害防治的发展方向,为今后开展园林植物病虫害防治工作提供了有益的借鉴。 相似文献
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澳大利亚辐射松遗传育种及其借鉴 总被引:1,自引:0,他引:1
澳大利亚辐射松遗传改良在过去的几十年中取得了较大的成绩, 其育种计划与育种策略在一定程度上反应了当前世界林木育种水平。较详细地介绍与分析了澳大利亚辐射松遗传改良的历程与成就, 供我国林木育种工作者参考。 相似文献