共查询到19条相似文献,搜索用时 296 毫秒
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森林鼠害及其防治对策张刚成森林如果受到过量的采伐和不合理的经营或人为活动的干扰破坏时,就会产生逆反和退化,导致整个森林生态系统的破坏,改变原有生态平衡,引发各种自然灾害。森林鼠害就是在森林生态系统遭到破坏,形成了有利于鼠类生存繁衍的条件下对树木造成危... 相似文献
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杨恒 《绿色中国(综合版)》2013,(17):34-39
湖北省神农架修建机场的消息传出后,引发了人们的强烈关注。对于在这块被誉为全球生物基因库、森林覆盖率高达85%的土地上修建机场,许多人担心会对当地生态环境和野生物种造成难以恢复的破坏。而在当地有关部门看来。机场修建对环境不会带来多大影响,还会带动当地经济发展。修建机场真不会对当地生态环境造成破坏?能否为当地群众带来致富的机会?民间环保组织自然大学志愿者7月1日走进神农架,进行了5天的实地调研。他们的调查。将有助于人们对这些问题有一个更深入的了解。 相似文献
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加强森林抚育对提升云南景洪植物多样性的作用 总被引:1,自引:0,他引:1
《绿色科技》2016,(7)
指出了森林植物的多样性对于人类的生存与发展、森林生态系统的完善以及生态功能的实现都具有十分重要的作用和意义,对森林多样性的重要作用进行了阐述,对森林抚育对云南省景洪市植物多样性的影响进行了分析,探讨了云南省景洪市开展森林抚育提升植物多样性的重要举措。 相似文献
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基层森林防火地理信息系统的建立和应用对森林火灾的防范和扑救具有重要意义。延平区通过构建森林防火地理信息系统,实现了林业信息的快速传递,有利于森林防火指挥中心及时了解详实的火场情况,制定合理的扑火方案,实现扑火力量的最优配置,把森林火灾造成的损失尽量减少到最低限度。 相似文献
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<正>森林有害生物对森林生态有重大影响,一般是指对森林、树木和森林种子种植的破坏,以及一些有害生物、杂草和其他有害生物造成的破坏。其发生具有明显的周期性、传播性和潜伏期等特点,难以预防和控制。当灾害发生时,会对森林资源造成巨大损失,对日常森林的生产和生态环境产生很大影响。加强森林病虫害防治,不仅是保护生态环境,减少灾害的发生,还能确保森林资源对人类的可持续利用价值,确保我国林业事业的有序发展。 相似文献
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介绍云南省绿春县气候及植被特点.对2008年5月在黄连山国家级自然保护区内采集的云南省蛇类新记录种——菱斑小夹蛇形态特征、生活环境进行描述,对其地理分布进行了讨论. 相似文献
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在历史上,世界各国的森林资源大体上都经历了由破坏到恢复的发展过程。尽管森林的破坏给人类社会造成极其严重的后果,但在一切“文明”国家中又是不可避免的,直到森林破坏威胁到他们的安全时,才迫使人们认识这个问题。从十九世纪中叶以来,日本、美国及欧洲各国从破坏森林转向保护、恢复和发展的阶段。很多林业发达国家由于国情、社会制度、自然条件不同,有不同的林业发展战略,但有共同之处值得借鉴。苏联林业发展有三次转移。十月革命胜利后,由于各种原因,发生了燃 相似文献
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MIGIS-一种确定林业发展项目的有效工具 总被引:2,自引:0,他引:2
Deforestation caused bythe felling of trees for firewood is a major cause of environmental degradation in some villages in Luchun Counth,Yunnan Province.This is of particular concem in the headwaters ofmajor rivers such as the Black River where increased runoff,erosion,and sediment yield impact on the millions of persons living downstream.While the links between forest clearance,the ability ofthe land to sustain production,and the sustainability of communities are understood,the pressures of having to survive today often outweigh consideration of the consequences for tomorrow.The real challenge for these communities is that they recognise their situation and negotiate a practical solution rather than walt the intervention and support.It is essential therefore that the changes which have taken place are documented and their future impact illustrated.This information must then be portrayed in a manner that makes it accessible and comprehensible to all,even to those who are illiterate.For this reason the use of graphics offers considerable merit over textual and numerical analyses.This paper explores the use of MIGIS (an acronym for community based planning which integrates the techniques of PLA and GIS) to facilitate a negotiated,bottorn-up approach to afforestation with the Hani farmers of Luchun County,Yunnan in southwest China. 相似文献
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归纳,分析了云南省绥江县在竹产业建设与退耕还林和构筑林业体系的经验,以及存在的问题,完善措施与建议。 相似文献
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橡胶树上的一种新炭疽菌 总被引:1,自引:0,他引:1
在云南绿春县橡胶园发现一种新的橡胶树炭疽病,经病原菌鉴定,确认是博宁炭疽Colletotrichum boninense,同时还对博宁炭疽与橡胶树炭疽病常见病原菌胶孢炭疽Colletotrichum gloeosporioides、尖孢炭疽Colletotrichum acutatum进行致病力、菌丝生长温度和分生孢子形态的比较,结果显示3种菌存在明显差别,胶孢炭疽致病力强,适应性强,分布广,是目前云南橡胶树炭疽病病原优势种,其次是尖孢炭疽,而博宁炭疽还少见,仅在红河绿春的戈兰和德宏瑞丽的莫里橡胶树上零星发生。 相似文献
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云南省沧源县气候条件适合各种竹子生长,竹类资源极其丰富,分布竹种达17属55种以上,是云南乃至世界上区域性竹种较为集中和丰富的地区之一。文章分析了沧源竹类种质资源和竹林资源特点,提出了主要经济竹种和重点保护竹种,旨在为推进沧源竹产业发展和加强竹类多样性保护提供科学依据。 相似文献
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Much research effort is being devoted to developing forest management practices with limited impacts on biodiversity. While the impact of poplar Populus sp. plantations on biodiversity is relatively well-known at the landscape scale, the impact of alternative management practices at the plantation scale has received much less attention. Yet biodiversity is likely to be impacted by the choice of the poplar clone, stem density at plantation, type and duration of the understory control, and age at which the poplars are harvested. In this study, we investigated the impact of these factors on herbaceous plant communities with data from plant surveys conducted in 85 young (2–5 years) and 96 mature (11–17 years) hybrid poplar high-forest plantations in northern France. On average, ruderal or generalist plants contributed to 40.5% of the plot species richness; tall herbs (60.2%), forest (26%) and meadow plants (13.8%) contributed to the remaining 59.5% more specialised species. Soil moisture and soil nitrogen were major determinants of plant communities: wet soils were favourable to tall herbs, while meadow and forest species preferred moist soils; a significantly lower diversity of the three species groups was reported in the nutrient richer soils (in mature plantations only for forest plants). Mean species richness decreased with plantation age except for forest species. Plant communities in young plantations showed little differences in composition according to the type of understory control (chemical, mechanical or both). The development of a shrubby layer in mature plantations was restricted to the drier soils and was detrimental to both meadow plants and tall herb species. Effects of previous land use on forest and tall herb species were found only in young plantations, suggesting a rapid reset of plant communities for these two groups. This may not be the case for meadow species as the influence of previous land use was significant in mature plantations only. Finally, clone type and stem density at plantation had no significant impact on plant communities. Adjusting age at which the poplars are harvested seems the only effective way to drive plant communities in high-forest poplar plantations: delaying poplar harvest (probably beyond 15–20 years) would benefit forest plants, while advancing poplar harvest (about 10 years) would benefit tall herbs, especially in wet soil conditions. 相似文献
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在景谷县大黄栀子多年来的种植基础上,探讨了景谷县大黄栀子的主要技术措施,内容包括:采种、育苗、选地、整地、定植、初植、密度、病虫害、抚育管理,为进一步推动景谷县发展山区经济、增加农民收入、调整产业结构提供科学和实践依据。 相似文献