全文获取类型
收费全文 | 84篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 9篇 |
环保管理 | 52篇 |
综合类 | 11篇 |
基础理论 | 2篇 |
污染及防治 | 2篇 |
评价与监测 | 2篇 |
社会与环境 | 7篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 4篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1984年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有87条查询结果,搜索用时 31 毫秒
1.
红外光度法测定石油类和动植物油常见问题探讨 总被引:2,自引:0,他引:2
根据石油类在波数为2930cm-1、2960 cm-1、3030 cm-1全部或部分谱带处有物征吸收的原理,采用红外光度测油仪和水样絮凝富集技术测定石油类、动植物油。 相似文献
2.
Philippa Spoel 《Environmental Communication: A Journal of Nature and Culture》2018,12(3):295-300
Northern Ontario’s Ring of Fire/Wawangajing controversy constitutes a complex site of debate about the risks and benefits of mining in an area of major ecological significance that is also the ancestral territory of nine First Nation communities. This paper investigates the rhetorical alignments and divergences in public calls by Matawa First Nations tribal council and the Ontario Wildlands League for stronger environmental assessment of mining projects than that favoured by the Canadian government. Tracing the terminologies each group uses to describe the affected region and its inhabitants in its activist rhetoric about EA offers insight into the contingent, shifting ways in which wilderness advocacy and Indigenous justice discourses may speak together yet distinctly within contemporary environmental-natural resource disputes. 相似文献
3.
Understanding how setting attributes influence the nature of the visitor experience is crucial to effective recreation management.
Highly influential attributes are useful indicators to monitor within a planning framework, such as Limits of Acceptable Change.
This study sought to identify the setting attributes perceived to have the most profound effect on the ability to have “a
real wilderness experience” and to assess the degree to which attribute importance varied with situational context and visitor
characteristics. To this end, exiting hikers were surveyed at moderate and very high use trailheads in Alpine Lakes Wilderness,
WA (USA), and Three Sisters Wilderness, OR (USA). They were asked about the degree to which encountering varying levels of
different setting attributes would add to or detract from their experience. Attributes with the largest range of effect on
experience, based on evaluations of different levels, were considered most important. The most influential attributes were
litter and several types of campsite interaction—people walking through camp and number of other groups camping close by.
The perceived importance of setting attributes did not vary much between wilderness locations with substantially different
use levels, suggesting that conclusions are robust and generalizable across wilderness areas. There also was little difference
in the perceptions of day and overnight visitors. In contrast, we found substantial variation in the perceived importance
of setting attributes with variation in wilderness experience, knowledge, attachment, and motivation. Our results validate
the emphasis of many wilderness management plans on indicators of social interaction, such as number of encounters. 相似文献
4.
Option value is estimated for the Washakie Wilderness, northwest Wyoming, USA, using the contingent valuation technique. Consumer
surplus, the traditional measure of economic value, is estimated separately and compared with option value. Several populations
are tested, including Washakie visitors, Yellowstone National Park visitors, and residents from four metropolitan test markets:
Salt Lake City, Utah; Portland, Oregon; Nashville, Tennessee; and Orlando, Florida, USA. The average annual preservation option
value (consumer surplus) expressed by on-site wilderness visitors is $46.17 ($80.13), by urban residents is $9.70 ($8.97),
and by rural residents is $8.43 ($7.80). Four selected attributes are determined to be important in motivating option demand
for the Washakie, including existence value, bequest value, the desire for an on-site visit, and interest in securing the
visiting privileges of others. The results suggest that option value is important in wilderness valuation and that off-site
users account for a large part of the economic value of wilderness. 相似文献
5.
Recreational impacts on backcountry campsites in Grand Canyon National Park,Arizona, USA 总被引:2,自引:0,他引:2
Backcountry campsites were studied in three desert vegetation types (pinyon-juniper, catclaw, and desert scrub) in Grand Canyon National Park, Arizona. Relationships between amount of use and amount of impact were examined within each vegetation type. The area disturbed was small, but impacts were generally severe. Important impacts were increased soil compaction and associated decreases in infiltration rates and soil moisture content; these were substantially more pronounced on high than low use sites. The only impact parameter that differed significantly between vegetation types was core area. The types of impact identified are similar to those found in the coniferous forests studied elsewhere, as is the logarithmic relationship between amount of use and amount of impact. However, Grand Canyon sites can support more visitor use before reaching near-maximum levels of impact for important impact parameters. 相似文献
6.
Disturbance of natural vegetation by camping: Experimental applications of low-level stress 总被引:3,自引:0,他引:3
David N. Cole 《Environmental management》1995,19(3):405-416
Previously undisturbed sites in four different vegetation types were camped on for one night and for four nights. Changes
in vegetation cover and vegetation height were measured after camping and one year later. Results are presented separately
for different campsite zones—parts of the site where campers slept, cooked meals, and stored their packs. Just one night of
camping was sufficient to cause evident impact in all four vegetation types, although the amount of impact varied significantly
between zones and between vegetation types. Vegetation impact on campsites used four nights was generally less than twice
as severe as impact on the sites used one night. The effects of camping on vegetation were also predicted for 12 other vegetation
types on the basis of vegetational responses to experimental trampling. These results suggest that impact can almost always
be minimized by confining camping to a small number of campsites instead of dispersing use across many campsites. 相似文献
7.
Under the United States Clean Air Act Amendments of 1977, a class I designation safeguards wilderness areas from the negative
effects of new sources of air pollution. We monitored streamwater chemistry in the class I Lye Brook Wilderness in southwestern
Vermont from May 1994 through August 1995. Stream samples were collected biweekly at nine sampling locations throughout the
wilderness and were analyzed for major cations and anions, dissolved organic carbon, pH, and acid-neutralizing capacity. Eight
of nine sites sampled had mean annual acid neutralizing capacity values below zero. During the study period, decreases in
streamwater acid neutralizing capacity values were caused primarily by SO4
2−. At some sites, however, NO3
− and naturally occurring, weak organic acids were seasonally important. During high discharge, the low pH and high concentrations
of inorganic monomeric Al were at levels that are toxic to acid-sensitive aquatic species. Watershed mass balances were calculated
to determine annual gains or losses for measured ions. These budgets indicate that S inputs and outputs were nearly equal,
there was a net loss of base cations, and a net gain in N. How long these watersheds can continue to assimilate additional
N inputs is unknown. 相似文献
8.
Irreversible environmental changes are occurring along the Colorado River in the Grand Canyon as a result of regulation of the river flow by the Glen Canyon Dam. The questions of primary importance in managing this great natural resource are 1) in what manner and how rapidly are the physical and ecological adjustments taking place, and 2) is the increased use of the river for recreational boating contributing to the degradation? Human use along the Colorado River is limited, for the most part, to the relic, pre-dam fluvial deposits colloquially called “beaches.” With the new river regime these deposits are positioned well above the present high-water stage, 27,000 cubic feet/second (cfs), or 765 cubic meters/second (cms), so they are not replenished periodically as they were prior to construction of the dam in 1963. The dominant natural processes now are aeolian sand transport and mass wasting. The float-trip passengers use the river beaches for hiking, camping, and. lunch stops. At the most desirable sites thirty to forty people camp on the beaches each night over a four to five month season. Human impact includes incorporation of campsite litter, burial of chemically treated waste, and the direct stress associated with people walking on the vegetation and unstable sedimentary deposits. Results of our investigations indicate that the rate of degradation at the most heavily used sites exceeds the capacity of aeolian processes to reestablish natural landscapes. Therefore, careful management of float trjps is needed if these environments are to be maintained in a natural state rather than a “sand-box” state. 相似文献
9.
10.
何炳光 《中国人口.资源与环境》2002,12(3):37-41
加拿大在资源环境宏观管理的经验和成就是多方面的 ,最重要的是政府支持 ,坚持实施可持续发展战略 ,要求各部门围绕这个中心制订相关的支持和激励政策 ,推动清洁生产的实施。作者在借鉴加拿大经验基础上 ,对我国的资源环境管理提出若干建议。 相似文献