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91.
退化土地评价及其生态重建方法研究 总被引:4,自引:0,他引:4
本文系统分析了退化土地评价研究的历史和方法,总结了退化土地的主要类型、分布和形成机理,最后概述了退化土地重建领域的研究进展。 相似文献
92.
David G. Evans 《Environmental management》1994,18(3):321-329
The decision as to whether to recycle discarded objects or not has traditionally been made on a simple financial basis. However,
over the last few years a popular movement has sprung up which regards recycling as a good in itself, and this movement finds
itself at odds with the present financial basis for recycling. In this paper a rationale for recycling is worked out in an
attempt to resolve this conflict. It is concluded that the normal market signals do not provide a proper basis for recycling
decisions and that this market failure must be corrected by government intervention. However, this intervention should not
take the form of uncritical support for recycling. Rather the societal objectives of individual recycling proposals should
be identified and the proposal should then be evaluated in terms of whether it would achieve these objectives more effectively
than some alternative action. 相似文献
93.
本文通过对哈尔滨信义沟的调查和分析,研究了市区性河流的自净规律,将高浓度悬浮物沉降和有机物厌氧分解纳入河流水质模型,从而得出了广义的市区性河流多河段水质数学模型,这种建模的方法对市区性河流具有普遍的意义. 相似文献
94.
On integration of policies for climate and global change 总被引:2,自引:0,他引:2
Hadi Dowlatabadi 《Mitigation and Adaptation Strategies for Global Change》2007,12(5):651-663
Currently envisaged mitigation of greenhouse gases (GHG) emissions will be insufficient to appreciably limit climate change
and its impacts. Adaptation holds the promise of ameliorating the impacts on a small subset of systems being affected. There
is no question that both will be needed. However, climate change is only part of a broader multi-stress setting of global
through to local changes. Privileging climate related policies over other concerns leads to tragic outcomes. Climate policies
need to be designed for and integrated into this broader and challenging context. This paper focuses on placing climate change
within the broader context of global change and the importance of aligning climate policy objectives with the myriad other
policies that still need to be implemented if our primary goal is improving human welfare rather than limiting our focus to
climate change and its impacts. 相似文献
95.
城市生态环境质量评价指标体系 总被引:17,自引:2,他引:17
从生态学的角度建立了较完整的城市生态环境质量评价指标体系 ,并对沈阳城市生态环境质量进行了评价。通过评价结果表明 ,本指标体系是科学的、可行的 ,可以用于评价城市生态环境质量。 相似文献
96.
97.
ABSTRACTPolicy evaluation has grown significantly in the EU environmental sector since the 1990s. In identifying and exploring the putative drivers behind its rise – a desire to learn, a quest for greater accountability, and a wish to manipulate political opportunity structures – new ground is broken by examining how and why the existing literatures on these drivers have largely studied them in isolation. The complementarities and potential tensions between the three drivers are then addressed in order to advance existing research, drawing on emerging empirical examples in climate policy, a very dynamic area of evaluation activity in the EU. The conclusions suggest that future studies should explore the interactions between the three drivers to open up new and exciting research opportunities in order to comprehend contemporary environmental policy and politics in the EU. 相似文献
98.
里杜湖富营养化综合评价及预测 总被引:2,自引:0,他引:2
根据里杜湖水库的水质监测及水文资料,选择评分法结合生物优势种评价法以及“源-效应”预测模型对里杜湖水库水质的营养状态进行综合评价及预测。结果表明:里杜湖水库水质已轻度富营养化,并有逐年加重的趋势。旨在正确评价和预测里杜湖水库营养状态,并为同类水库的营养状态评价及预测提供参考和借鉴,从而为水库水质管理及富营养化的控制提供科学依据。 相似文献
99.
在对评估工作的过去和现状进行回顾的基础上,对评估工作的市场化和拓展评估领域进行了分析和展望,以使评估工作发挥更大的作用,更好地为环境管理工作服务。 相似文献
100.