排序方式: 共有9条查询结果,搜索用时 55 毫秒
1
1.
Michael Pacione 《Journal of Environmental Planning and Management》1985,28(2):65-69
Government responses to the problems of the inner city currently focus on comprehensive programmes of positive discrimination. The first and most extensive is the G.E.A.R. project in Glasgow. Regular monitoring of the effectiveness of such large‐scale initiatives is essential. If the physical and social aims of such policies are to be realised, assessments must utilise both objective and subjective indicators. 相似文献
2.
Stephen E. Watts 《Environmental management》1998,22(4):611-616
Artemisia tridentata Nutt.) habitat within the Idaho Army National Guard Orchard Training Area in southwestern Idaho. The purpose of this study
was to determine the short-term (1–2 years) influence of tank tracks on vegetation and microphytic crusts in shrubsteppe habitat.
The two types of tank tracks studied were divots (area where one track has been stopped or slowed to make a sharp turn) and
straight-line tracks. Divots generally had a stronger influence on vegetation and microphytic crusts than did straight-line
tracks. Tank tracks increased cover of bare ground, litter, and exotic annuals, and reduced cover of vegetation, perennial
native grasses, sagebrush, and microphytic crusts. Increased bare ground and reduced cover of vegetation and microphytic crusts
caused by tank tracks increase the potential for soil erosion and may reduce ecosystem productivity. Reduced sagebrush cover
caused by tank tracks may reduce habitat quality for rodents. Tank tracks may also facilitate the invasion of exotic annuals
into sagebrush habitat, increasing the potential for wildfire and subsequent habitat degradation. Thus, creation of divots
and movement through sagebrush habitat by tanks should be minimized. 相似文献
3.
An Index to Measure Depreciation in Air Quality in Some Coal Mining Areas of Korba Industrial Belt of Chhattisgarh, India 总被引:1,自引:0,他引:1
Singh G 《Environmental monitoring and assessment》2006,122(1-3):309-317
The comparison with National Ambient Air Quality Standards does not always depict a true pic-ture of the Air Quality Status of a study area. As an alternative an index that measures depreciation in Air Quality on more realistic terms has been proposed and
applied to the ambient air monitoring data collected from some areas of Korba Coalfields in India. Results have been discussed in detail to illustrate the applica-tion of the proposed index and utility in bringing out more realistic air quality assessment. 相似文献
4.
This paper estimates the true economic income for the Chilean mining sector, using the welfare foundations for the usual net domestic product (NDP) income measure of the traditional National Accounts System (NAS) provided by [Weitzman, M., 1976. On the welfare significance of national product in a dynamic economy. Quarterly Journal of Economics. 90, 156–162; Weitzman, M., 2000. The linearised Hamiltonian as comprehensible NDP. Environment and Development Economics. 5, 55–68]. The total depletion of natural capital caused by mining is calculated by estimating, on the one hand, the depreciation of resources (using the net price approach) and, on the other, the environmental costs provoked by mining activity. The results show that, correcting the usual GDP measure for man-made capital depreciation plus the total loss of natural capital, the standard mining GDP measure of the NAS overestimates by 31–36% the economic income generated by Chile's mining sector during the period 1985–1996. 相似文献
5.
自然资源资产折补研究 总被引:5,自引:0,他引:5
姜文来 《中国人口.资源与环境》2004,14(5):8-11
折补是自然资源资产再生产的重要手段。文章分析了自然资源资产折补内涵。探讨了自然资源资产折补理论与方法。给出了自然资源资产折补模型。 相似文献
6.
7.
We propose a new method of cost-benefit analysis to investigate whether the new air pollution control equipment-electrocyclone vis-a-vis cyclone has the potential for practical use. When the flow rate of waste gas is 1000 m3/min, the cost of cyclone is then compared with that of electrocyclone provided that the benefit side is being fixed. The results show that the capital cost of electrocyclone is higher than that of cyclone, but the operating cost of electrocyclone is much lower than that of cyclone. Straight-line depreciation method is used to calculate the depreciation of capital cost per year. The total cost of electrocyclone is NT$ 160 290 per year which is cheaper than that of cyclone NT$ 225 356. 相似文献
8.
城乡建设用地增减挂钩中拆旧地块选址适宜性评价研究——以辽宁省桓仁县华莱镇为例 总被引:2,自引:0,他引:2
为了更加合理的选择拆旧地块,以辽宁省桓仁县华莱镇为例,通过实际分析与特尔菲法选取14个评价指标,通过层次分析法确定指标的权重,采用加权指数和法计算评价得分,并运用累积曲线分级法将评价对象分为四类区域。结果表明最适宜拆旧区占居民点总面积的4.14%,适宜拆旧区占居民点总面积的6.16%,不适宜拆旧区占居民点总面积的31.91%,最不适宜拆旧区占居民点总面积的57.79%。 相似文献
9.
1