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文中从生态流的角度考察城市绿地的生态防护对象和生态防护过程,分析城市绿地针对风、水、土、气、声这5种非生物过程的防护特征与影响因素,着重梳理绿地三维生态特征对生态防护效能的影响,并提出相应的规划导控优化策略。
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文章介绍了一种用于河道治理与建设的节约型生态驳岸的设计内容与构建方法,采用模块搭叠方式构建成的新式驳岸克服了传统驳岸的诸多缺陷,具有坚固、节约、生态、灵活、富有生机等多种优点。
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通过对德国鲁尔工业区采用生态技术治理工业废弃地的经验总结,结合唐山市南湖采煤沉陷区的生态恢复实例,分析探讨环境治理的生态理念和有效方法,为资源型城市向生态型城市转型提供参考。
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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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黄文峰 《林业机械与木工设备》2012,(12):49-51
介绍了密闭式蒸汽冷凝水回收系统的主要原理及结构,对回收过程中存在的问题进行分析并提出了相应的解决方法,对回收系统所产生的效益和回收期进行计算。实践表明,该项技术经济和社会效益显著,具有推广应用价值。 相似文献
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Yosuke Nakamura Hisashi Miyafuji Haruo Kawamoto Shiro Saka 《Journal of Wood Science》2011,57(4):331-337
Acetic acid fermentability of various compounds from beech wood as produced in a two-step hot-compressed water treatment was
evaluated by fermentation tests using standard compounds with Clostridium thermoaceticum and Clostridium thermocellum. For cellulose- and hemicellulose-derived products, the former microorganism was found to ferment compounds with low molecular
weights such as monosaccharides, decomposed products, and organic acids to acetic acid, while the latter was found to ferment
compounds with high molecular weights such as polysaccharides and oligosaccharides to acetic acid. Lignin-derived products
were, on the other hand, fermented by both microorganisms to acetic acid. Based on these lines of evidence, co-culture with
C. thermoaceticum and C. thermocellum was evaluated and proven to increase acetic acid fermentability. Consequently, almost all compounds produced from beech wood
in hot-compressed water were found to be converted to acetic acid when using these microorganisms in combination. Thus, hot-compressed
water treatment coupled with acetic acid fermentation would likely be a powerful method to produce acetic acid from lignocellulosics. 相似文献
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采用了“SBR-沸石”法处理氨氮废水,研究了沸石的影响因素、SBR系统的曝气时间以及有无沸石对SBR系统中氨氮废水的处理效果。结果表明:SBR-沸石法对氨氮废水具有较好的效果,进水氨氮浓度越大,沸石对氨氮的吸附量就越大,且吸附速度越快。pH值、COD对沸石吸附氨氮的能力影响很小,可忽略。SBR-沸石法对氨氮、COD和总氮的去除率比纯SBR法分别提高了6.5%、1%、27.6%。加入10g沸石后,即1L废水加3g左右沸石,SBR系统对氨氮和总氮的去除作用一直持续了1个月左右,因此,采用SBR-一沸石的方法还是比较经济,且效果比较明显。 相似文献
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Soil microorganisms, such as plant growth-promoting rhizobacteria (PGPR), play crucial roles in plant growth, but their influence on plant water relations remains poorly explored. We studied the effects of native soil microorganisms and inoculation with the PGPR strain Aur6 of Pseudomonas fluorescens on water stress responses of seedlings of the drought-avoiding Pinus halepensis Mill. and the drought-tolerant Quercus coccifera L. Plant growth, nutrient concentrations and physiology (maximum photochemical efficiency of photosystem II (PSII; F(v)/F(m)), electron transport rate (ETR), stomatal conductance (g(s)) and predawn shoot water potential (Psi(PD))) were measured in well-watered plants, and in plants under moderate or severe water stress. Inoculation with PGPR and native soil microorganisms improved tree growth, and their interactions had either additive or synergistic effects. Both F(v)/F(m) and ETR were significantly affected by PGPR and native soil microorganisms. Marked differences in g(s) and Psi(PD) were found between species, confirming that they differ in mechanisms of response to water stress. A complex tree species x treatment interactive response to drought was observed. In P. halepensis, F(v)/F(m) and ETR were enhanced by PGPR and native soil microorganisms under well-watered conditions, but the effects of PGPR on Psi(PD) and g(s) were negative during a period of water stress. In Q. coccifera, F(v)/F(m) and ETR were unaffected or even reduced by inoculation under well-watered conditions, whereas Psi(PD) and g(s) were increased by PGPR during a period of water stress. Our results indicate that microbial associates of roots can significantly influence the response of tree seedlings to drought, but the magnitude and sign of this effect seems to depend on the water-use strategy of the species. 相似文献
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植物需水状况的精密诊断分析技术 总被引:2,自引:0,他引:2
针对目前我国水资源短缺的现状 ,提出基于植物水分诊断检测技术的闭环反馈控制系统来诊断植物水分亏缺状态。该系统的关键技术是研究设计精确测量叶片厚度的位移传感器 相似文献
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指出了生态浮床技术已广泛运用在水质修复的工程中,但由于其静态处理的特征,处理效果缓慢。在生态浮床技术进行水处理的基础上,提出了动力系统以及立体结构的设计,建立了具有自动循环功能且水处理效果显著的立体浮床。在水处理的同时,具有使静态水体循环、过滤截留杂质、美化环境等功能。 相似文献
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针对浙江省东阳江流域存在的污染问题,结合东阳江流域水环境状况,在适宜地区建设A/O预处理、高效垂直潜流(二级)、表流串联人工湿地系统对制药废水进行深度处理。该湿地系统进水量16000t/d,运行情况表明:该系统对影响东阳江水质的主要污染物COD和NH3-N具有良好的处理效果,COD、NH3-N的平均去除率分别达到75.4%、62.3%,出水COD、NH3-N平均质量浓度分别为32.5mg/L、3.77mg/L,从而能有效改善东阳江流域的水环境质量,同时在经济和运行管理上也有较好的可行性。 相似文献
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植物叶片厚度微增量精确测量系统的研究设计 总被引:1,自引:0,他引:1
针对传统的农业节水灌溉系统存在的弊端,提出以植物叶片的几何尺寸作为反馈控制变量的新型智能节水灌溉系统,把植物作为被控对象,构成真正的闭环控制系统,提高控制精度,从而提高节水率。对于植物叶片厚度微增量的高精度测量,进行深入的研究。 相似文献