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141.
Wu Kangming Cui Wang Ren Guofa An Jing Zheng Kewen Zeng Xiangying Ouyang Minghui Yu Zhiqiang 《Environmental Chemistry Letters》2023,21(4):1943-1949
Environmental Chemistry Letters - Shale gas extraction is increasing worldwide in the context of the energy crisis, yet the associated pollution by this industrial activity is poorly known. Here we... 相似文献
142.
密云水库上游流域不同林分土壤有机碳分布特征 总被引:4,自引:0,他引:4
在全球气候变化背景下,森林土壤有机碳库作为全球土壤碳库的重要组成部分,已成为全球碳循环研究的重点之一。以密云水库上游流域天然次生山杨(Populus davidiana Dode)、白桦(Betula platyphylla Suk.)混交林、天然次生辽东栎(Quercus wutaishanica Blume)林、人工华北落叶松(Larix principis-rupprechtii Mayr.)林、人工油松(Pinus tabulaeformis Carr.)林和灌丛等5种典型林分为研究对象,选取典型样区,进行密集采样和试验分析,探讨了不同林分土壤有机碳质量分数和密度的分布特征。结果表明:在整个土壤剖面上(0~40 cm),不同林分土壤有机碳质量分数和密度大小顺序均为:杨桦林〉辽东栎林〉灌丛〉落叶松林〉油松林,总体上呈现出随土地利用强度和人为干扰程度增加而降低的变化趋势,即天然次生林比人工林更有利于土壤有机碳的储存和积累;不同林分类型土壤有机碳质量分数和密度均在表层(0~10 cm)最大,并随着土层深度的增加呈下降趋势,剖面分布差异明显;此外,不同林分在0~20 cm土层中的单位面积土壤有机碳储量均占其剖面总储量的57%以上,即土壤有机碳富集在0~20 cm深的表层土体中。因此,为增加森林土壤固碳,应加强对天然次生林的保护,减少人类活动对森林及其表土层的干扰。 相似文献
143.
144.
铝电解预焙阳极沥青烟净化技术研究进展 总被引:2,自引:0,他引:2
随着铝厂等企业生产规模的扩展,相应炭素企业也得到迅速发展,其排放的沥青烟污染日趋严重,大力研究开发能广泛应用的沥青烟污染控制技术已迫在眉睫.介绍了国内外铝电解用炭素阳极焙烧炉沥青烟的净化处理研究现状,详细评述了现有沥青烟气的治理技术及存在的问题,提出为解决沥青烟治理中亟需解决的关键问题,可从量子理论出发研究其粘附机理,分析沥青烟粘结性能与沥青烟相分布、成分组成之间的关系,研制改善沥青烟粘性的特效添加剂,可达到高效净化沥青烟的目的,并可推动电解铝及相关行业的可持续发展. 相似文献
145.
146.
The Pearl River Delta Economic Zone is the most dynamic economic area in South China. One of the major problems in the region is the sustainable utilization of the water resources. On the basis of analysis of the water environment status and pollution sources, it is suggested that domestic sewage is the primary cause of pollution. Two new concepts "degradation coefficient" and "degradation volume" of water resources, due to pollution, which may be used to assess macroscopically the carrying capacity of the water resources and sustainability of the water environment, are proposed by the authors. The results calculated indicate that the volumes of degraded water resources will be up to 204, 352, and 537 million m3 in 2002, 2010, and 2020. It is suggested that water for daily consumption and domestic sewage must be controlled more effectively and there should be cross-regional coordination in tackling problems of water environment. 相似文献
147.
148.
以汶川地震灾后恢复重建利用世行优惠紧急贷款四川省城镇市政基础设施项目环境监理开展情况为例,阐述了城镇基础设施建设项目环境监理开展过程中的重点,并分析了环境监理方案和环境监理的形式,通过对环境监理工作的经验总结分析,提供了一些建议以供参考,以期对其他城镇基础设施建设项目施工期环境监理工作的开展提供借鉴意义。 相似文献
149.
150.
Effects of spatial resolution of remotely sensed data on estimating urban
impervious surfaces 总被引:1,自引:0,他引:1
Impervious surfaces are the result of urbanization that can be explicitly quantified, managed and controlled at each stage of land
development. It is a very useful environmental indicator that can be used to measure the impacts of urbanization on surface runoff,
water quality, air quality, biodiversity and microclimate. Therefore, accurate estimation of impervious surfaces is critical for urban
environmental monitoring, land management, decision-making and urban planning. Many approaches have been developed to estimate
surface imperviousness, using remotely sensed data with various spatial resolutions. However, few studies, have investigated the
effects of spatial resolution on estimating surface imperviousness. We compare medium-resolution Landsat data with high-resolution
SPOT images to quantify the imperviousness in Beijing, China. The results indicated that the overall 91% accuracy of estimates of
imperviousness based on TM data was considerably higher than the 81% accuracy of the SPOT data. The higher resolution SPOT data
did not always predict the imperviousness of the land better than the TM data. At the whole city level, the TM data better predicts
the percentage cover of impervious surfaces. At the sub-city level, however, the ring belts from the central core to the urban-rural
peripheral, the SPOT data may better predict the imperviousness. These results highlighted the need to combine multiple resolution
data to quantify the percentage of imperviousness, as higher resolution data do not necessarily lead to more accurate estimates. The
methodology and results in this study can be utilized to identify the most suitable remote sensing data to quickly and efficiently extract
the pattern of the impervious land, which could provide the base for further study on many related urban environmental problems. 相似文献