刍议衡阳市林木种苗事业建设与发展

林木种苗是造林绿化最基本的生产资料,也是生态环境建设与发展的战略资源.笔者力图从衡阳市林木种苗发展现状着手,研究和探索当前种苗发展过程中存在的困难和问题,从促进林木种苗可持续健康发展的角度,提出解决的办法和建议,以期对今后衡阳市林木种苗事业建设与发展起到抛砖引玉的作用.参6.     

论自然保护区的共同管理

自然保护区是我国可持续发展的重要事业之一,近几年来发展迅猛,取得了丰硕成果.但是,自然保护区的建设和管理还处在初级阶段,存在许多困难和问题.本文分析了自然保护区管理上存在的困难和问题,探讨了如何实施共同管理,旨在为自然保护区建设和管理提供现实依据.     

乡村生态文明研究知识图谱:基于CiteSpace Ⅴ可视化分析

乡村生态文明建设是乡村振兴的重要内容之一.通过CiteSpace Ⅴ可视化与计量化方法分析我国乡村生态文明领域20 a发展历程,阐明乡村生态文明领域热点研究方向与存在问题并给出了相应的建议,这对我国未来乡村生态文明建设具有重要借鉴意义.研究结果表明,乡村生态文明为主题的研究可分为起步发展、缓慢增长、快速增长阶段,总体呈...     

黄河保护立法中生态环境管理制度建设的若干思考

黄河保护立法是体现黄河保护、治理、高质量发展的国家意志和社会行为准则.建立完善生态环境管理制度是推进国家治理体系、提高国家治理能力的重要内容.为集中力量解决黄河流域目前存在的生态本底脆弱、系统环境超载等突出生态环境问题,必须将生态环境管理制度建设提升至立法层面.系统分析黄河流域生态环境管理方面的现状与问题,以提升流域生...     

龙山县生态公益林建设与管理现状及对策

简述了龙山县生态公益林建设与管理的现状,剖析了新时期发挥生态公益林的生态、社会效益与提高林农收入矛盾,分析了龙山县生态公益林建设与管理中存在的问题,提出了龙山县实现生态公益林生态、社会效益与提高林农收入的措施.参4.     

我国自然保护区生态旅游存在问题分析

通过对2006年自然保护区建设管理基本情况调查和2008年自然保护区生态旅游专项问卷调查得到的数据进行分析,立足我国自然保护区生态旅游发展现状,从自然保护区生态旅游涉及的宏观决策管理,保护区管理机构,保护区与社区、旅游经营者、游客、生态环境的关系6个方面,系统地分析目前我国自然保护区生态旅游存在问题,并提出相应对策.     

西藏自治区自然保护区事业的现状和展望

介绍了西藏自治区保护区事业的发展概况和现状，指出了目前保护区建设与管理中存在的主要问题，对今后保护区的规划与发展提出了意见和建议。     

对我国农业废弃物资源化利用的思考

对我国农业废弃物的资源化利用状况进行了综述分析与探讨,指出当前我国在农业废弃物利用方面尚存在诸多问题,包括农业废弃物产生量巨大且总量不清、农业废弃物粗放低效利用且闲置状况严重、农业废弃物利用技术与产业化水平滞后,以及农业废弃物利用相关的政策法规与社会化服务体系不健全等问题,同时,总结指出了我国农业废弃物资源化利用的几个发展方向,即向能源化、肥料化、饲料化、材料化、基质化和生态化发展.在此基础上提出了我国农业废弃物资源化发展的对策措施,包括:(1)建立与健全农业废弃物资源化利用与无害化处理相关的政策法规;(2)结合新农村建设,加大资金扶持力度,加强农业废弃物利用的基础设施建设;(3)加快推动农业废弃物资源化利用的产业化进程,大力发展循环经济;(4)鼓励和推动农业废弃物资源化利用技术的创新研究、示范与推广工作.     

“5个量化指标”在杉木优良无性系选择中的应用

为选育杉木优良无性系,量化选育的参数指标,以湖南省金洞林场的131个杉木无性系4 a、6 a、8 a、10 a、15 a、20 a和25 a测定数据为基础,对其生长性状采用采用相关性分析、方差分析,并估算不同无性系林分遗传力、遗传增益等遗传参数.同时,对木材性状进行测定并分析.结果表明:25 a优良无性系的变异增幅较大,平均树高、胸径、立木蓄积分别大于对照(实生苗林)16.02%、27.58%、84.86%,各生长因子的遗传力(重复力)h~20.85且木材力学特性与对照的木材材质没有差异;以生长性状和木材性状为指标,筛选出6个优良无性系,入选率为4.58%.研究表明,25 a杉木性状较优,优良无性系的入选率较高.     

利用程控小总机进行安全防护

介绍了一种利用振铃起动电路与小型程控交换机结合，组成子站自动监测系统辅助装置的实用技术，以解决大气自动监测子站微机死机、受干扰后无法自动恢复正常工作和雷击问题。     

Ein neuer „Meiofaunastecher” zur quantitativen Probennahme in Weichböden

During 1972 and 1973, quantitative meiofauna samples were taken by subsampling out of a bottom sampler from some parts of the Kiel Bight. A new method has been developed to operate in very soft and muddy sediments with high organic and water contents. The construction of the new instrument is described. It consists of a bottomless plexiglass box, the cover and front of which may easily be removed. It does not cause compression of the sampled sediment, and hardly disturbs it. The semi-liquid surface of the sediment is kept in place by the use of a “sledge” and a strip of cellophane tape inside the sampler. Some preliminary results from one station show a meiofauna maximum (mainly nematodes) in the subsurface layer of the sediment, but this varied from one month to the next. The water content of the sediment at another station was as high as 300%.     

Utility of check dams in dilution of fluoride concentration in ground water and the resultant analysis of blood serum and urine of villagers,Anantapur District,Andhra Pradesh,India

High levels of fluoride (beyond 1.5 ppm) in ground water as source of drinking water are common in many parts of Andhra Pradesh, India, causing fluorosis. The study carried out in endemic Nalgonda District, Andhra Pradesh, has indicated that the fluoride-rich ground water present in the wells located down stream and close to the surface water bodies is getting diluted by the low-fluoride surface water. Encouraged by this result, check dams were constructed upstream of the identified marginally high fluoride bearing ground water zones in Anantapur District to reduce fluoride levels as an alternate solution for safe drinking water.In this paper, an attempt is made to study the utility and effect of these check dams in dilution of fluoride concentration in drinking water and its resultant impact on the health aspects of certain villagers of Anantapur District through the analysis of their blood serum and urine. Ground water samples from three fluoride-affected villages, blood and urine of males and females from the same villages were collected and analyzed for fluoride using ion selective electrode method. The results indicated that the fluoride levels in blood serum and urine of males in the age group of 5–11 years are found to be the highest. The concentration of fluoride in ground water is directly proportional to the concentration of fluoride in blood serum and urine. The concentration of fluoride in ground water with depth of the aquifer is a function of lithology, amount and duration of rainfall, rate of infiltration, level of ground water exploitation in the area etc. The construction of check dams upstream of the identified marginally high fluoride waters will not only cause additional recharge of ground water but also reduces the fluoride concentration eventually improving the health of the villagers.     

农村生态文明建设视域下改善农村干群关系的思考

建设社会主义新农村需要生态文明,当前我国农村生态文明建设还面临着很大问题和挑战.农村生态态文明建设需要加强广大农村干部与农民群众的密切联系,改善农村干关系事关重大.     

绿道网规划建设与管理进展分析

绿道是将大量自然、经济、社会的景点、集聚地和示范点连接在一起的,兼具生态、体育、休闲、文化和通行功能的,彰显绿色、智慧、创新、务实和人本理念的线性生态开敞空间。经历了一百多年的发展后,绿道建设已成为一项全球性运动。绿道建设对促进城市质量提高,推动低碳生态城市建设具有重要意义。西方国家和部分亚洲国家和地区的绿道已发展到了较为成熟的阶段。我国内地引入绿道的时间较晚,但建设步伐快,发展迅速,尤其是珠三角绿道建设更为迅速。国内外在绿道网建设过程中积累了一定的经验,也存在一定的问题,为更好地推进我国绿道网建设,提高绿道网管理水平,非常有必要对国际绿道网和我国珠三角绿道网的进展状况进行分析。本文系统地介绍了绿道的发展历程,并从规划设计、建设实践、科学研究与管理等方面对绿道建设状况进行了深入分析。在总结、分析国内外绿道网建设经验与存在问题基础上,提出了我国绿道网建设对策,主要包括：（1）因地制宜,科学规划;（2）加快完善标识系统建设;（3）尽快探讨绿道网经营模式;（4）建立绿道监测与评估机制等。     

双向调控管理模式在县域生态建设中的应用

双向调控管理模式是我国在长期城市环境治理与生态建设实践中积累的成功模式之一。县域生态系统的特点以及县域系统中的各种生态问题起因人们对系统的不适应调控的现实说明：该模式的实质同样适用于县域生态建设。     

天津市创建国家环境保护模范城市的战略思考

根据天津市“十五”计划纲要提出的“实施可持续发展战略,建设生态城市”的要求,在大量调查研究的基础上,从天津的实际出发,本着与时俱进的精神,创造性地提出天津市生态城市建设两步走,把创建国家环境保护模范城市作为生态城市建设的基础和初级阶段的战略构想,文章深入地阐述了天津市“创模”的必要性,迫切性和得大意义。根据国家的标准,客观地,实事求是地分析了天津“创模”的基本条件,存在的突出问题,努力方向。提出了天津“创模”的目标任务,措施和建议。     

城市生态监测指标体系研究——以江苏省城市为例

从生态监测的发展出发,总结了目前江苏省城市主要的生态问题,并从城市生态系统原理的角度,分析了江苏城市问题的生态学实质。根据生态检测指标体系制定的目的性,以生态系统理论为基础,提出了构建思路和构建原则,最后进行了生态监测指标体系的构建,并指出了构建意义。     

衡阳市生态园林城市建设的思考

城市生态系统有自身的特点和独特的功能．城市园林景观建设在建设生态城市中起着重要的作用,但建设中存在很多问题．针对目前衡阳市生态建设存在的问题,提出衡阳市建设生态园林城市应提高公民生态意识和继承人文景观,塑造多样化的自然生态环境,以造就城市景观生态的和谐发展．参2．     

Changing morphology of Ghana’s Accra coast

Coastal features in Ghana's Accra coast reflect both past and present processes that have been undergoing changes. These changes are influenced by a range of morphogenic factors such as geology and climatic conditions. These regimes have shaped the coastal geomorphic features through weathering processes that decompose and disintegrate the coastal rock. Sea level rise due to climate change is expected to increase coastal erosion and thus result in rapid changes in shoreline positions. Historic rate of sea level rise in Accra coast is about 2 mm/yr (Ibe & Quelennec, 1989) which is predicted to reach approximately 6 mm/yr in the next century since it conforms to the global change (Armah et al., 2005). This will result in flooding of vulnerable areas and enable waves to break closer inland. The effectiveness of the erosion process is aided considerably by the type of geology. Accra coastal zone has three types of rock in three identified geomorphic regions. They include unconsolidated and poorly consolidated rock along the western region, the Accraian series occupying the central region and the Dahomeyan series in the eastern region. The geology has thus influenced the extent to which the coastal features have changed and the type of cliff that is formed as a result of erosion within the regions. Generally, soft rock coastal features decay more rapidly than those of hard rock and tend to act as sediment sources. Human activities such as dam construction over the Densu River, engineering interventions to check the spread of erosion and sand mining has created sediment deficit which has exacerbated coastal erosion in Accra. Anthropogenic factors are estimated to account for 70-90% of coastal erosion problems in Accra.