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51.
采用生态系统健康理论分析城镇生态环境问题具有较强的理论意义和现实意义.着重构建了城镇生态系统健康评价的指标体系和模糊评价模型,提出评价标准.并对苏州某城镇生态系统健康进行评价.进而指出制约因子并提出相应的诊断方案,为其优化生态系统结构和完善系统功能提供科学依据. 相似文献
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于2002年1~7月份在抚顺市区四个点位采集了环境空气中的可吸入颗粒物样品,经分析后获得了可吸入颗粒物组分的时间分布和空间分布特征,即采暖期PM10样品中有机碳(OC)、元素碳(EC)的绝对含量和相对含量均高于非采暖期,工业区PM10样品中的Fe、Zn、Pb的绝对含量和相对含量均明显高于其它点位,反映了其工业区的特点。 相似文献
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We draw on the economic, corporate governance, and family business literatures to explain why the effects of family on family firms makes this governance form theoretically distinct from those of public and private non‐family firms. Our thesis is that parental altruism, when combined with private ownership and owner‐management, influences the ability of the firm's owner‐manager to exercise self‐control, which, in turn, can expose some family firms to conflicts rooted in the agency threats of moral hazard, hold‐up, and adverse selection. We then discuss why some other family firms are able to minimize these dark side threats and thereby attain altruism's brighter side. Finally, we discuss how altruism's influence changes over time as ownership becomes dispersed among family members and across generations. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Liu Sinuo Lei Yin Zhao Jinsong Yu Shuxia Wang Ling 《Environmental science and pollution research international》2021,28(3):2995-3007
Environmental Science and Pollution Research - Water conservation and soil retention are two essential regulating services that are closely related, and their relationship might produce synergies... 相似文献
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Lingling Wu Yue Jiang Lili Zhang Ling Chen Haiping Zhang 《Environmental science and pollution research international》2014,21(4):2663-2676
Pollution from urban highway runoff has been identified as one of the major causes of the deterioration of receiving water quality. The purpose of this study is to assess the toxicity of urban storm water samples in Shanghai using the zebrafish (Danio rerio) embryo test and the bacterial luminescence (Vibrio qinghaiensis) assay. The toxicity of highway runoff from seventeen storm events was investigated in both grab and composite samples. Zebrafish embryos were exposed to the runoff samples and development parameters including lethality, spontaneous movements in 20 s, heart beat rate, hatching rate, and abnormality of zebrafish embryos were observed after 24, 48, 72, and 96 h of exposure. Inhibition rates of luminescence intensity were also recorded. The results showed that in the zebrafish embryo toxicity tests, both grab and composite samples increased the lethality, reduced the percentage with spontaneous movements and heart beats, inhibited the hatching of embryos, and induced morphological abnormalities. In the Vibrio qinghaiensis toxicity test, all the grab samples inhibited the luminescence, while some of the composite samples promoted it, which indicated that different types of toxicants might have been affecting the species. The multivariate statistics analysis indicated that heavy metal (zinc, manganese, and copper) and PAHs might mainly contribute to the toxicity of runoff samples. 相似文献
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