生态园林绿地建设中应用树木与草坪效果对比分析   总被引：7，自引：0，他引：7  

姜国义 《防护林科技》2001,1(1):25-26,57

本文从树木与草坪在用水量、观赏时间、造价、管理成本和环保上的 5项指标进行对比 ,论述了风沙、干旱地区的绿地建设应该是树木为本 ,花草点缀 ,乔木为主 ,灌木为辅的原则。  相似文献   

合肥市主要城市景观林群落类型及结构研究          下载免费PDF全文

杜艳艳  吴泽民  张前进 《中国城市林业》2013,11(2):1-4,8

研究合肥市区不同功能区景观林组成与结构,共记录102个样方。结果表明:景观林主要组成种有111种,分属45科、81属;主要优势种是香樟、枫杨、水杉、杨树、桂花、石楠等;不同功能区景观林树种相似性系数分别为0.4(公园与居住区)、0.24(高校与居住区)、0.22(公园与高校);林分平均密度560株/hm2,平均基盖度18.83 m2/hm2,平均胸径16.99 cm,平均树高10.13 m,均为正态分布。群落类型可归纳为5个植被型、16个群系及69个群丛,以落叶阔叶型与常绿落叶阔叶混交型为主。建群树种主要有香樟、广玉兰、女贞、雪松、水杉;群落外貌较整齐,树木整体较为健康,景观效果较佳;但层次结构、树种多样性不高,应丰富树种,增加群落的垂直层次,采用近自然经营。    相似文献   

桉木基复合材料研究进展   总被引：1，自引：0，他引：1  

李怡欣  李万菊 《广东林业科技》2017,33(6):114-118

桉树作为我国主要的人工林树种之一,具有品种多、生长速度快等优点,在缓解我国木材供 需矛盾上发挥了重要作用。由于桉木存在高生长应力、节疤、易变形开裂等劣势,目前工业上主要用作 纸浆、纤维板或胶合板和单板层积材的芯板,其利用方式单一,附加值较低。近年来研究者们以桉木与 塑料、竹材等材料为原料制备复合材料,展现出良好的尺寸稳定性、力学性能、阻燃性、抗菌性等性能, 有效地提高了桉木的利用价值,拓宽了桉木在人造板、集装箱等领域的应用。文章分别介绍了桉木 / 塑 料、桉木 / 竹、桉木 / 水泥、桉木 / 无机物 4 种复合材料,并对其制备工艺、性能等方面的研究进展进行 综述。  相似文献   

浙江风水林类型、特点及保护管理探讨   总被引：1，自引：1，他引：0  

罗旋  王小德  杭璐璐  陈婧婧 《福建林业科技》2012,39(2):173-177

浙江风水林主要包括村落风水林、坟园墓地风水林、寺庙风水林等3种基本类型。阐述了浙江风水林的历史发展过程及浙江先民对风水林的保护管理,总结了浙江风水林的类型及基本特点,并提出风水林的保护管理对策。  相似文献   

Farms in the black forest of Baden-Württemberg: A historical review     

Helmut Brandl 《Small-Scale Forestry》2006,5(1):145-159

Today the Black Forest is an internationally renowned tourist region in Germany. For centuries the Black Forest remained as a low mountain range regarded as not suitable for settlement due to its unfavourable climatic conditions and difficult terrain. Clearing the dense forests and settlement therefore started at a historically late stage compared to other regions of Germany, about 1000 years ago. Due to the special conditions in this area, the structure of the settlement had to be quite different to those landscapes with more favourable conditions for agriculture. A single-farm settlement developed, farms situated 200 to 400 m away from each other, surrounded by meadows, agricultural land and forests and owned by the farmer’s family. This structure has remained in some areas until today; in other areas different types of settlement took place, and great changes occurred during history. A special type of agroforestry — a slash-and-burn-management of forests — also took place 150 to 200 years ago.  相似文献   

小陇山林区日本落叶松人工商品林抚育间伐技术及经济效益研究   总被引：2，自引：0，他引：2  

姚雪刚 《林业科技》2005,30(4):17-20

通过分析，确定了小陇山林区日本落叶松人工商品林抚育间伐的时间，抚育间隔期及抚育强度，预测了抚育间伐的经济效益。  相似文献   

风水理论在居住区规划中的应用研究——以文华景苑别墅区为例     

程朝霞  段渊古 《安徽农业科学》2006,34(18):4580-4582

通过对中国传统文化中的风水理论的分析,从而提出一些建设性的观点来营造具有特色的居住环境,并以文华景苑别墅区为例,从选址、朝向、道路、绿地系统4个方面来阐述风水理论在居住区规划中的应用。  相似文献   

黄土丘陵沟壑区不同复垦时间沙棘纯林物种多样性分析     

韩丽君  李金莲 《中国水土保持》2007,(4):33-34

以生态修复为目的的人工沙棘林具有较好的水土保持效应,在生态环境的恢复建设中意义重大。但是通过对沙棘群落土壤种子库和地上植被的研究发现,随着样地复垦时间的增加,其物种多样性指数的提高趋势下降。由此可见沙棘纯林存在弊端,应考虑生态建设的可持续发展。  相似文献   

试论退耕还林政策和市场机制的衔接   总被引：2，自引：0，他引：2  

侯春灯 《农业现代化研究》2003,24(6):421-425

国家“以粮换地，以钱换林”的退耕还林政策。过分强调退耕还林面积和林种的“计划性”，忽视了市场机制的作用。因而引发以农村土地承包经营权为基础、以林权为核心的各种冲突。在退耕还林政策中，应当充分发挥市场的作用。把“国家意志”和“市场意志”有机地结合起来。  相似文献   

Do regional gradients in land-use influence richness, composition and turnover of bird assemblages in small woods?     

A.F Bennett  S.A Hinsley  R.D Swetnam 《Biological conservation》2004,119(2):191-206

Small patches of natural or semi-natural habitat have an important role in the conservation of biodiversity in human-dominated environments. The values of such areas are determined by attributes of the patch as well as its context in the surrounding land mosaic. There is a need for better understanding of the ways in which assemblages are influenced by patch context and the scale over which this occurs. Here we examine the influence of regional environmental gradients on the richness, annual turnover and composition of breeding bird species in small woods in south-eastern England. Regional gradients were defined independently of woods by an ordination of attributes for 5 km × 5 km landscape units across a 2100 km² region. Patch-level attributes, particularly area, were the most important predictors for most bird variables. For woodland migrants and woodland-dependent species, variables representing the context of each wood, either at a local or regional scale, explained significant additional variance in species richness after accounting for wood area, but did not do so for species turnover. Significant context effects for woodland-dependent species related to the extent of hedges and woodland cover in the local vicinity (<1 km radius), whereas for woodland seasonal migrants the best predictors of richness after patch area were two regional environmental gradients. The initial cue to settlement for migrants may be at a coarse regional scale, with selection for suitable landscapes that have a greater extent of woodland cover. Edge species showed different responses: they were influenced by the diversity of structural features in woods, and were a more-dominant component of the avifauna in isolated woods in open fenland environments of the region. Significant relationships between coarse regional gradients (25 km² units) and bird assemblages in small woods (0.5-30 ha) suggest that population and community processes in the avifauna operate across a broader scale than local patch neighbourhoods. They also highlight the importance of adopting a landscape or regional perspective on potential changes to land-use in rural environments, and on the conservation management of small reserves.  相似文献