共查询到20条相似文献,搜索用时 531 毫秒
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初雪 《绿色中国(A版)》2008,(14)
依帆坐在街边树阴下的一张白色的长椅上,恹恹地抽着烟,不知道这是他坐在这里抽的第几根烟了,在喷出的烟雾中,他茫然地看着街边来来往往的行人,似乎都带着冷漠,彼此擦肩而过,每个人都忙忙碌碌的,而这一切仿佛都与他无关。再有几个小时,他和她就要在此分手,各奔东西。抬眼望着马路对面那个欣欣宾馆,4楼的某个房间里,有他的妻。也许此刻她正在收拾着行李,依帆不想看到她面无表情的样子,所以他选择逃出来,抽烟。她,雨桐,依帆的大学同学,他的初恋,他的妻子。而从今天以后,她就不再是他的妻,不再是那个让他疼、让他气的宝贝了。 相似文献
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《绿色中国(A版)》2008,(10)
世界对于我们有太多的未知与不解,生命的起源,文化的发展,科技的进步以及情感的归属等等,我们想知道的事情太多太多,想知道这些,书籍无疑是最好的工具。透过它们,我们不再困惑,不再迷茫,透过它们,一切都变得清晰起来…… 相似文献
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张刘栋默默地忍住眼角泛起的泪花,面对众人,坚定地说出她的誓言。时隔十八年,革命烈士张永岗的女儿张刘栋已经成长为一名高三的学生,多次受到学校的表彰。在她的身后,是71名来自全国各地英烈子女的孩子,他们的父亲,有一个共同的名字——叫警察,穿着一样的制服,有着相似的经历,在祖国和人民需要的时候,挺身而出,以生命作为代价,谱写了自己的人生篇章。此 相似文献
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林业“三剩物”的开发利用现状和前景概述 总被引:3,自引:0,他引:3
目前国内"三剩物"(采伐剩余物、造材剩余物和加工剩余物)以作为人造板和制浆造纸的原料、制备化学品以及作为直接和间接燃料的形式被利用.国际上林业剩余物能源的研究开发主要集中于气化(使有机物转化成可燃气体)、液化(利用生物发酵或酸水解技术制取乙醇和通过热解等技术转化成液化油)和固化(林业剩余物能源固化成型技术).未来林业"三剩物"的开发利用将集中在:作为木材的替代资源的开发利用;以木材"三剩物"和次小薪材为原料生产加工综合利用产品;林业"三剩物"高品质生物质能源产品的开发. 相似文献
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本文论述了林区开展综合开发,要从我国国情出发,根据国有林区的历史和现状闯出自己的生存和发展空间,开拓林区发展之路,提出了林区资源综合开发的缘起和目的及现代林区综合开发的特点和经营模式,指出资源综合开发必须立足科技创新,重视绿色食品产业,分析了资源综合开发如何面对中国加入世贸组织,最后对林区资源综合开发提出了建议。 相似文献
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Philippe Leturcq 《Annals of Forest Science》2014,71(2):117-124
Context
The effective ways of using wood production with a view to mitigating climate change are still disputed. Currently, there are two major opposing conceptions. One proposes to increase the carbon stock in forests, in wood products or in some kind of long-term wood storage, thus giving primacy to carbon sequestration. The other invokes the concept of biomass carbon neutrality to assert that the substitution of wood for fossil fuels avoids carbon emissions.Aim and method
This paper contributes to this debate by comparing carbon footprints of heat generation when choosing wood or other fuels as alternatives.Result
On condition that wood can be preserved with sufficient durability to meet the time frame of the necessary transition towards carbon-free energy resources (decadal to centennial time scales), one can demonstrate that the use of fossil fuels, with the exception of coal, is still preferable. The reasons are that the intrinsic carbon emission factor for wood has the highest value among all fuels in common use and that reference to the concept of wood carbon neutrality neglects the possibility of storing carbon positively in wood for a long time.Conclusion
The conclusion is that to mitigate climate change it is better to store wood than use it as a fuel. 相似文献14.
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This article examines alternative forest harvesting regimes when ecosystem services in terms of water quality, biodiversity conservation and climate change mitigation are included in the analysis. The harvesting regimes are whole-tree harvesting with stump removal and conventional stem-only harvesting. The harvesting regimes are evaluated under two alternative climate policy contexts. The first alternative is a carbon neutral bioenergy policy, which assumes the carbon dioxide (CO2) neutrality of bioenergy and produces substitution benefits, as bioenergy replaces fossil fuels. The second alternative climate policy, a carbon non-neutral bioenergy policy, takes into account the fact that bioenergy causes carbon dioxide emissions, producing substitution costs, and that harvested woody biomass affects the ability of a forest to act as a carbon sink. We extend the traditional Faustmann (1849) rotation model to include nutrient load damage, biodiversity benefits, and climate impacts. The empirical analysis is based on Finnish data from a catchment experiment carried out on drained peatland forests. The empirical results show that under a carbon neutral bioenergy policy, whole-tree harvesting with stump removal produces the highest net social benefits. However, if a carbon non-neutral bioenergy policy is assumed, the net social benefits are greater under stem-only harvesting. 相似文献
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RESEARCHSITELivingfue1splayedanimportantroleinheatconcentrationactionorinheatsourceofforestfire.Whenitshumiditydecreasestoacertainlevel,theybecameaheatsourcewhenthelivingcombustibl-eswerecombinedwithfire.Thus,itwasessentialhowtodeterminethemoisturesituationandthefOrestfiredangerdegreetobeforecastedaccurately.Thedynamicmodelspresentedinthispaperwereusefultosolvethisproblem.Everyyear,-therewerealotofforestfires,especiallythefireoccurrenceinDaxinganMountains,inthespringofl987.Itwasveryimpo… 相似文献
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通过对滩地生态农业几种开发模式的调查和效益分析,指出,开发滩地资源,建设生态农业,不仅激活了存量土地资源,而且是条件类似的农村实施可持续发展战略的有效途径,并提出了全省河流中下游开发利用的前景。 相似文献
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低碳,是在全球气候变化逐渐尖锐,传统化石燃料日渐贫乏的时代背景下提出的一种新型、节能环保的理念。面对污染日益严重、气候日渐恶劣的城市环境,低碳园林无疑是缓解尖锐气候的有效途径之一。本文,通过对低碳理念及其产生背景的剖析,提出了低碳园林的设计原则。 相似文献