共查询到19条相似文献,搜索用时 140 毫秒
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以绿道建构城乡绿地生态网络是一种构筑完整连续的生态系统的重要方法,其于结构、功能及系统层面建立起人类与自然保护之间的连接,是生态向着城乡演进的一种空间战略、发展模式与生态策略。文中侧重从生态视角解析绿道由本体、边缘区、影响辐射区3个要素构成,提出绿道在生态网络建构过程中体现出的统领性、生态性、系统性3大特性,并分别从其与城乡的空间形态演进、系统耦合关系及价值驱动机制3个方面分析绿道及绿网对于城乡发展的意义与价值,为探知、建构合理高效的城乡绿地生态空间提供了新的视角。
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采用实例分析——合肥市城市绿地系统防灾避险规划,通过对规划结构布局,基础设施布置,植物种植设计分析,指出合肥市避灾绿地规划将构建合理的城市防灾绿地网络,有利于城市的防灾和减灾。
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合肥环城公园廊道景观及生态环境作用分析 总被引:1,自引:0,他引:1
从景观生态学角度分析合肥市环城公园,具有鲜明的廊道结构特征,对城市空间格局,城市景观及生态环境起着重要的作用,合肥市绿地系统的建设目标,应以市域范围内生态廊道为依托,真正形成环状与放射状结合,楔形绿地切入的框架结构。
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从"以人为本"的理念出发,通过对居住区中心绿地的道路、广场、植物、建筑的空间分析,提出活动空间设计方法和有关对策。
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城市绿色空间建设的内涵与存在的问题 总被引:9,自引:0,他引:9
现代城市绿色空间的概念与内涵包括城市森林、园林绿地、都市农业、绿色廊道、滨水绿地以及立体空间绿化等在内的复合生态系统中的绿色空间。其生态服务功能的强弱取决于生态规划的合理性和管理的适宜性。本文从研究角度、研究尺度、服务功能、评价指标、规划方法和建设方式等方面分析总结了当前城市绿色空间建设中存在问题,并从复合生态系统角度提出了调控策略和整合能力建设措施。
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银川市休闲绿地规划建设初探 总被引:1,自引:1,他引:0
从银川市园林绿化现状、城市休闲绿地现状、开发城市休闲绿地功能的有利条件、城市休闲绿地存在问题人手,提出了城市休闲绿地的主副结构布局、规划分区、分类规划、休闲设施的配置和休闲活动类型,以促进银川市创建"运动休闲城市"的进程。
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土壤在调节地球气候和物质循环方面起着重要作用,但是由于人为因素的影响,不当的土地经营模式(如居民用地、农业耕地、毁林开荒)对土壤质量产生了深刻影响,使土壤质量发生变化。本研究对黑龙江省尚志市帽儿山林场的4种不同的土地利用与经营模式(森林土壤、农田土壤、场部用地和森林迹地)下的土壤理化性质和土壤酶活性进行测定与分析,探讨不同土地利用模式对其土壤理化与土壤酶学特性的影响。研究发现4种土壤类型的10个采样点的10个土壤理化指标和5个土壤酶活性指标间存在显著差异,土壤质量从高到低依次为:森林土壤,森林迹地,林场场部用地,农田用地。相关分析表明土壤脲酶和过氧化氢酶与土壤含水量、土壤全氮、土壤全碳、土壤有机碳、可溶性全碳和可溶性有机碳含量之间成显著正相关;多酚氧化酶与土壤pH成显著正相关。因此,不同土地利用方式对土壤理化性质和土壤酶活性产生显著影响。 相似文献
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Weston F. Mwase Åsmund Bjørnstad James M. Bokosi Moses B. Kwapata Brita Stedje 《New Forests》2007,33(3):297-307
Biodiversity is declining throughout southern African miombo woodlands due to poor land use practices that are detrimental
to soil, vegetation and habitat. We aimed at examining tree and shrub species diversity and distribution in Uapaca kirkiana-dominated woodlands under three land tenure types; forest reserves, customary and leasehold land. The study was conducted
at different forest sites within similar agroecological zone in southern Malawi. Study sites were located at a range of altitudes
between 900 and 1,200 m a.s.l. Three circular plots each with 32.60 m radius were established at each study site to sample
tree and shrub species composition, structure and distribution under three land tenure types. We found that forest reserves
had higher species diversity with an average of 16 tree families, 27 genera and 34 species as compared to only 10 tree families,
6 genera and 6 species on customary forest lands. Comparisons of diameter at breast height size class distributions showed
that customary land had significantly low numbers of small (5.0–10.0 cm) and very large (≥30 cm) diameter classes suggesting
lower levels of regeneration and high rate of anthropogenic activities. The high species diversity and richness in forest
reserves and leasehold land indicate high potential for protected lands to restore tree species diversity. It is concluded
that levels of human activities as influenced by land tenure type reduce tree species diversity, composition and distribution
at the different sites, and this confirms the hypothesis that open access lands are not compatible with conservation of tree
and shrub species diversity because of high anthropogenic activities. 相似文献
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Insecticidal activities and active components of the alcohol extract from green peel of Juglans mandshurica 总被引:4,自引:0,他引:4
The extract of green peel of Juglans mandshurica Maxim was extracted by common method for studying its insecticidal activities and analyzing the active components. Results showed that the alcohol extract and the chloroform part of extract (separated with chloroform from alcohol extract) form green peel of J. mandshurica have insecticidal activities in contact toxicity and stomach toxicity against larvae of Lymantria dispar L.. After application of the extracts for five days, the corrected mortality of larvae of Lymantria dispar for both extracts was more than 50% in contact toxicity and stomach toxicity at the concentration of ≥ 5 g·L^-1. The insecticidal activity for both alcohol extract and chloroform part of extract is more effect in contact toxicity than in stomach toxicity, but no significant difference in the insecticidal activities was found between alcohol extract and chloroform part of extract. The active components in the chloroform part of extract from green peel of.J. mandshurica were analyzed by GC-MS. The analyzed results showed that the active components in the chloroform part of extract are: (1) joglone (5-hydroxy-1,4- naphthaoquinone), the relative content 27.11%, (2) 1,5-Naphthalenediol, the relative content 9.52%, (3) 7-Methoxy-1-tetralone, the relative content 6.81%, (4) Benzofuran, 2,3-dihydro-, the relative content 6.76%, (5) 4-Hydroxy-2-methoxycinnamaldehyde, the relative content 3.99%, (6) 2-Methoxy-4-vinylphenol, the relative content 3.05%. 相似文献
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The similarity theory was systematically introduced,by combining the theory and the analytic hierarchy process(AHP),and taking the dynamic changes of two-stage green land patches in Shenzhen as an example,the patches similarity of each district and each green land type were estimated.The location,shape and areas of green land unit were used as the similarity elements.Then the similarity coefficients can be defined.The overlapping number of green land patches indicated the location variation of green land.The ratio of minimum and maximum shape index of green land indicated the shape variation of green land.With the same method,the areas variation coefficient was also obtained.The results shows that based on similarity theory and method the estimation of green land variation is feasible,which can provide effective methods and accordance for the further assessment of green land development in Shenzhen Special Economic Zone. 相似文献
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文章以义丰镇绿地系统规划为例,分析快速城市化背景下小城镇绿地建设出现的问题。提出构建稳定镇域大环境生态绿地格局、发展森林式绿地、体现地域文脉及实现多功能复合的小城镇绿地系统规划思路。
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南昌市花园城市建设中存在的问题及对策措施 总被引:1,自引:0,他引:1
南昌市花园城市建设中存在绿地发展不平衡、建筑密度过大、绿地结构不合理、缺乏防护林、对绿量与景观质量的综合考虑不够等问题,据此提出了科学规划、加强旧城改造、增强绿地域特色、重视防灾功能等对策措施。 相似文献
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Mohammad Samaun Safa 《Small-Scale Forestry》2006,5(2):207-229
The encroachment rate in forests in Bangladesh is high and increasing — accelerated by rural poverty and the demand for dwelling
space and forest products — causing environmental degradation as well as loss of forest cover and productivity. The forests
are managed by the Forest Department, although a substantial area of marginal land belongs to other semi-public agencies including
Roads and Highways and the Water Development Board. This marginal land has been left unused or underutilized. In contrast,
nongovernmental organizations have an appropriate accessibility and technology disseminating ability to utilize this land
in reducing poverty and enhancing rural livelihood, and have been highly active and successful in rehabilitating encroached
forests. NGOs have added a new dimension to forest management, which has ensured community participation and protection of
the forests, both planted and natural. This study evaluates the social forestry activities of four large NGOs, namely BRAC,
Proshika, Caritas and CARE-Bangladesh, as well as national social forestry activities. By adopting a common partnership between
public and private authority, property right conflicts have been resolved and rural livelihoods enhanced, and scope has been
created for utilizing marginal land. The NGO partnership has been effective in reducing poverty and improving livelihoods.
As an outcome of this common partnership, 33,472 km of roadside planting and 53,430 ha of reforestation activities have been
carried out during the last two decades. 相似文献