矿区土壤分析及土地的生态治理研究     

孙凤余  常玉光  郭新华 《安徽农业科学》2008,36(32)

以河南省登封市某煤矿矿区为例,在分析矿区土地现状的基础上,用分析土壤污染源的方法进行了土壤分析研究,探索了矿区土地生态治理的问题。  相似文献   

An explicit stem profile model for forked and un-forked teak (Tectona grandis) trees in West Africa     

Stephen Adu-Bredu  Alphonse Foua Tape Bi  Jean-Pierre Bouillet  Martial Kouamé Mé  Samuel Yamoah Kyei  Laurent Saint-André 《Forest Ecology and Management》2008

Studies on stem profile of teak (Tectona grandis) hardly exist. This can be possibly attributed to the occurrence of forks that is prevalent on teak trees. Stem profile model was therefore developed for teak in West Africa, which took into account the occurrence of forks. Trees were destructively sampled from Moist Evergreen Forest (MEF), Moist Semi-deciduous Forest (MSDF), Dry Semi-deciduous Forest (DSDF) and Savannah ecological zones in both Ghana and Côte d’Ivoire for the study. A single set of parameters could be used explicitly to predict stem profile of any teak tree, irrespective of country, eco-climatic zone, edaphic variables, site index, tree age, stand density and tree competition. The model efficiency and root mean square error (in relative diameter) were calculated to be 0.97 and 0.053, respectively. The relative position of the forks along the stem bole, with respect to total tree height, was highly variable and did not follow any particular trend, except higher value for the first fork in the Moist Evergreen Forest zone. However, average tree height to the first fork decreased along the ecological gradient from MEF, MSDF and DSDF to Savannah. The extent of diameter reduction due to the forks could be predicted. Relative tree form for zero-forked, one-forked and two-forked trees was calculated to be 0.39, 0.36 and 0.33, respectively. Relative loss of stem volume due to one fork and two forks was estimated to be 6.5 and 13.9%, respectively. The measured stem volume when related to the corresponding predicted value yielded coefficient and intercept not significantly different from unity and zero, respectively, with an r² value of 0.97.  相似文献   

A comparative analysis of spatial, temporal, and ecological characteristics of forest fires in seasonally dry tropical ecosystems in the Western Ghats, India     

Narendran Kodandapani  Mark A. Cochrane  R. Sukumar   《Forest Ecology and Management》2008,256(4):607-617

The Western Ghats in India is one of the 25 global hotspots of biodiversity, and it is the hotspot with the highest human density. This study considers variations in the regional fire regime that are related to vegetation type and past human disturbances in a landscape. Using a combination of remote sensing data and GIS techniques, burnt areas were delineated in three different vegetation types and various metrics of fire size were estimated. Belt transects were enumerated to assess the vegetation characteristics and fire effects in the landscape. Temporal trends suggest increasingly short fire-return intervals in the landscape. In the tropical dry deciduous forest, the mean fire-return interval is 6 years, in the tropical dry thorn forest mean fire-return interval is 10 years, and in the tropical moist deciduous forest mean fire-return interval is 20 years. Tropical dry deciduous forests burned more frequently and had the largest number of fires in any given year as well as the single largest fire (9900 ha). Seventy percent, 56%, and 30% of the tropical moist deciduous forests, tropical dry thorn forests, and tropical dry deciduous forests, respectively have not burned during the 7-year period of study. The model of fire-return interval as a function of distance from park boundary explained 63% of the spatial variation of fire-return interval in the landscape. Forest fires had significant impacts on species diversity and regeneration in the tropical dry deciduous forests. Species diversity declined by 50% and 60% in the moderate and high frequency classes, respectively compared to the low fire frequency class. Sapling density declined by ca. 30% in both moderate and high frequency classes compared to low frequency class. In tropical moist deciduous ecosystems, there were substantial declines in species diversity, tree density, seedling and sapling densities in burned forests compared to the unburned forests. In contrast forest fires in tropical dry thorn forests had a marginal positive effect on ecosystem diversity, structure, and regeneration.  相似文献   

浅析广州近期城市公园生态设计方法与实践   总被引：1，自引：0，他引：1  

陈方慧  姜磊 《广东园林》2008,30(3):33-34

对广州近10年城市公园建设中在生态设计方面的实践进行了总结和分析,认为广州近期城市公园设计多采用注重自然、生态的绿化种植、注重资源的保留与再利用、注重保护和创建有生态意义的湿地与水系等生态设计方法。  相似文献   

滆湖鱼类群落时空分布及其与环境因子的关系   总被引：1，自引：0，他引：1  

李经纬  徐东坡  李巍  孔优佳  花少鹏  刘其根  张顺  胡忠军 《水产学报》2022,46(4):546-556

为掌握滆湖鱼类群落现状及动态,于2017—2018年在该湖设置16个采样点,使用多网目刺网和地笼对鱼类群落进行了周年季度采样,同时测定各采样点的水温(WT)、水深(WD)、透明度(SD)、pH值、叶绿素a(Chl.a)、总氮(TN)和总磷(TP)等环境因子,定量分析了鱼类群落结构特征、时空分布格局及其与环境因子的关系....  相似文献   

明清时期广东从化县乡村经济的开发与生态变迁     

王福昌 《古今农业》2009,(4):55-62

明清时期,广东从化县具有亚热带季风气候的特征,同时亦有小冰期的历史记录。随着县域经济的开发,地貌逐渐夷平。栽培作物和家畜不断增多,野生动植物的种群和数量趋于有利人类的方向发展。水土亦得到了部分的改良。从总体上看,明清时期从化的人与自然关系是和谐的。  相似文献   

历史时期河西走廊环境资源保护述略     

闫廷亮 《古今农业》2009,(3):40-47

历史时期,由于不合理的开发导致河西走廊诸多环境问题的产生。在环境问题造成的危害面前,人们对自然的认识进一步加深,关爱自身生存环境的意识不断提高,逐渐摸索出了一些保护环境资源的做法和模式并进行了有益的尝试,在一个时期内对维护走廊生态平衡、改善生存条件、促进经济社会发展发挥了积极的作用。  相似文献   

种猪场健康养殖网络管理系统的研制   总被引：1，自引：0，他引：1  

吕健强  罗清尧  杨亮  熊本海 《农业网络信息》2009,(2)

一个基于C#、VB.NET和JavaScript编程语言,以SQL2005为数据库,以Windows2003为服务器平台的种猪场健康养殖网络管理系统,包括基础数据的维护、生产管理、猪群繁殖、饲养与饲料、疾病与防疫、销售管理、统计图表、场内管理和系统维护共九大模块.  相似文献   

广州建设环境友好城市实施保障机制   总被引：1，自引：1，他引：0  

崔杰  郭艳华 《中国城市林业》2007,5(4):24-26

文章以科学发展观和环境友好型社会理论为指导,根据广州的实际,对建设环境友好广州提出八项保障机制:加强环境友好型法制化建设;建立环境与发展综合决策机制;建立生态约束机制;建立和完善鼓励机制;建立区域合作共生机制;建立社会参与机制;建立生态安全监测预警机制;建立生态补偿和投入机制。    相似文献   

城市国家森林公园的文化冲突与生态文化经营对策——以南京紫金山为例   总被引：1，自引：1，他引：0  

李明阳  王保忠  崔志华  申世广 《中国城市林业》2007,5(1):42-45

以紫金山国家森林公园为研究对象,以历史演变为线索,从陵墓文化、生态文化、农业文化、休闲文化及城市文化等诸种文化的矛盾与冲突的角度,分析国家森林公园生态环境问题产生的深层次根源,并制定具体经营对策,以期探索国家森林公园的可持续经营之路。    相似文献