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该文对石家庄市园林绿化树种的选择和配置进行了阐述,认为树种的选择和配置应以乡土树种、速生树种、乔木树种为主,同时注重选择环保型、彩叶型、果树型树种,并加强野生树种、引进树种的研究和开发力度,加强苗圃建设和苗木培育工作。 相似文献
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退耕还林工程营造混交林,在确定主要树种后,怎样选择适宜的混交树种,至关重要。因为选择的混交树种即要与主要树种在生长特点和生态要求等方面一致,又要考虑混交树种本身的适应性,达到营造混交林的预期目的。因此,混交树种的选择应具有如下具体条件:1.混交树种应具有良好的辅佐、护土和改土作用或其他效能,给主要树种创造有利的生长环境,以提高林分的稳定性。2.混交树种最好与主要树种之间的矛盾不太大。较理想的混交树种应生长较缓慢,较耐荫,其根型以及对养分、水分的要求与主要树种有一定的差别。3.混交树种与主要树种没有共同… 相似文献
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石家庄市园林绿化树种的选择与配置 总被引:1,自引:0,他引:1
本文对石家庄市园林绿化树种的选择和配置进行了阐述,认为树种的选择和配置应以乡土树种、速生树种、乔木树种为主,同时注重选择环保型、彩叶型、果树型树种,并加强野生树种、引进树种的研究和开发力度,加强苗圃建设和苗木培育工作。 相似文献
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经调查大庆市现有园林绿化树种110种,其中可作基调树种的有10种,可作骨干树种的有56种,可作一般树种的有44种。 相似文献
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本文对生物柴油树种进行了筛选与评价,认为珍稀树种、优质干果树种、出种率低的树种、优质食用油料树种、大面积造林具有困难的树种不宜选作生物柴油树种.初步筛选文冠果、花椒、黄连木、乌桕、油桐、光皮树、麻疯树、绿玉树、椰子、油棕等10种作为生物柴油树种.分别对以上树种的形态特征、生态习性、苗木培育、栽植方法、病虫害、自然分布、种子产量、利用年限、目前的应用、含油量、提炼的生物柴油性质及与0号石化柴油燃料特性对比等做了调查和评价.对生物柴油树种发展的制约因子如黄连木种子小蜂、文冠果"千花一果"、麻疯树等产生的有毒物质进行了探讨.以花椒为例,对生物柴油林的经济效益进行了评估. 相似文献
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在对重庆市的自然条件及社会经济状况分析的基础上,对实地调查和通过资料查阅确定的60种重庆市优良乡土树种进行了综合评价及选择。分别依据不同用途的树种制定不同的选择标准,确定出若干评价指标:对用材树种选定了速生性、丰产性、耐瘠性、抗寒性、抗旱性、抗病虫害能力、干材形质、材用价值等8个指标;对生物质能源树种选定了速生性、丰产性、耐瘠性、抗寒性、抗旱性、抗病虫害能力、多用途性、工业价值等8个指标;对景观树种选定了观叶、观花、观果、观树形、抗寒性、抗旱性、抗病虫害能力、抗污染性、吸硫能力、滞尘能力、降低噪音能力等11个指标。采用3分制并提出了每个指标的分级标准,运用层次分析法来确定各个指标的权重,根据各指标的分值和权重对60个目标树种进行了综合评价。主要结果与结论如下:(1)对20种用材树种进行综合评价的结果表明:鹅掌楸、香椿、桤木、檫木、毛桂、香樟为综合效益较高的用材树种,苦楝、川楝、厚朴、山杜英等树种次之。(2)按照20种生物质能源树种的综合评价值大小,建议选择杜仲、桤木、苦楝、刺槐、光皮树、山桐子等树种作为生物质能源林建设的主要树种。此外,灯台树、山苍子、文冠果、麻栎、栓皮栎等可以作为备选树种。(3)通过对20种景观树种的综合评价分析得出,深山含笑、四照花、珙桐、栾树、枫香、厚朴等是非常优异的观赏树种,可作为绿化骨干树种,枫杨、山桐子、红豆树、伯乐树等可作为绿化基调树种。 相似文献
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Socio-economic factors affecting smallholder tree planting and management intentions in Leyte Province,Philippines 总被引:1,自引:0,他引:1
Survey data have been collected from four rural communities in Leyte Province, the Philippines, on household tree planting
and management intentions, as well as the socio-economic characteristics, attitudes to tree planting and management, farming
practices and the number of trees planted. In relation to intended tree planting and management activities, respondents were
asked a series of structured questions as to what tree species they intend to plant, how many individual trees of each of
those species they plan to plant, and for what purpose they propose to plant each of the tree species. This paper reports
the results of analyses of the stated tree management intentions of households in the four communities and identifies the
socioeconomic factors that influence householders’ tree management intentions. Respondents were generally enthusiastic about
the possibility for further tree planting on their land, 75% indicating they would undertake planting. About 60% indicated
an interest in commercial tree farming, with no significant differences in this level of interest between communities. It
was found that a number of socio-economic variables indicating higher levels of land ownership and previous experience in
the forestry industry are related to the intention to plant trees to produce timber for sale. These include the use of materials
from public lands, participation in community organisations and community forestry programs, and the present management of
trees to produce timber for sale. 相似文献
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Reforestation, particularly in the tropics, is of crucial importance for the environment as well as society. However, small planting areas and low participation of smallholder farmers in tree planting programmes often obstruct realisation of set planting area targets. In this regard, we interviewed smallholder farmers undertaking indigenous species reforestation in Oda Kotoamso community within the Wassa Amenfi West District in Western Region of Ghana with a pre-tested questionnaire to identify (1) key socio-economic factors that predict the size of plantations they establish, (2) options that could encourage tree planting among smallholder farmers, and (3) tree species planted by the smallholder farmers and their conservation status according to the IUCN Red List of Threatened Species. Key socio-economic factors were predicted with multiple regression models and ANOVA. Options were ranked on a five-point Likert scale and their differences were tested with the Mann–Whitney U test. Age and income of smallholders are the significant predictors of plantation sizes but farmers’ household size and gender were not significant. Age and income accounted for 77.1% and 22.9%, respectively, of the total variation described by our model (R?2 = 38.4%). In order of importance, incentives (mean = 4.35, SD = 0.48), public nurseries (mean = 4.2, SD = 0.82) and agroforestry (mean = 4.06, SD = 0.56) were the options that could encourage reforestation, though incentives and public nurseries were not significantly different (p > 0.05). Almost half (9 of 19) of the tree species planted are categorised as Vulnerable species, which highlights the contribution of smallholder farmers to recovery of threatened tree species. Our findings suggest that sustainable provision of planting materials in incentivised and youth-based tree planting programmes could increase planting hectarage and conserve threatened tree species. 相似文献
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禄劝县城树种规划研究 总被引:1,自引:1,他引:0
对禄劝县城园林绿化中的树种应用现状进行了实地调查,记录了现有树种123种,分属52科94属,其中裸子植物14种,被子植物109种,常绿树种92种,落叶树种31种.对乡土树种应用不足、绿化树种色彩单一等绿化中存在的问题进行分析,确定了树种规划原则及指标体系.藉此提出了6种园林绿化基调树种,16种骨干树种,302种一般树种和84种潜在价值树种. 相似文献
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该文研究的用KI-VC预还原HAAS直接测定树叶中痕量砷的分析方法,测定工厂多种树叶中砷的含量,并同时与无污染区同类树种进行对比.这对于工厂正确选择抗污染绿化树种,净化空气,美化环境提供了科学依据. 相似文献
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1INTRODUCTIONTreesconstitutethemainpartofurbanforest.Differenttreespecieshasdifferentecologicalandlandscapefunctionsinshading,sterilizing,absorbingdustandbeautifyingtheenvironment.Moreover,thewholefunctionsofdifferenturbanforesttypescomposedofmanydifferenttreespecies,shrubsandherbagesaredifferent(PengZhenhua,2002;WangCheng,2002;WangCheng,etal,2002).Therefore,thelevelofstability,themagnitudeoffunctionalityandtherepresentationofsectionalcharacteristicareallcloselyrelatedwiththeselectionan… 相似文献
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In order to examine correlations among the properties of tree species and to quantify the relationships between these properties
and flammability, the properties of 20 tree species, consisting of heat of combustion, extractive contents, ash content, moisture
content and basic density, were measured via experimental methods. In the first instance, the results show that, there are
significant correlations between heat of combustion and extractive contents, ash content and basic density. Second, heat of
combustion can be presented effectively in terms of linear regression models with extractive contents and ash content as independent
variables. Third, a flammable model was developed based on four properties of tree species as independent variables, i.e.,
heat of combustion, extractive contents, ash content and moisture content. Finally, the flammability of 20 tree species is
compared, ordered and ranked based on this flammable model. The conclusion is that flammability can be predicted from properties
of tree species, which are significantly correlated among themselves.
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Translated from Forest Resources Management, 2008, 4: 83–88 [译自:林业资源管理] 相似文献