全文获取类型
收费全文 | 349篇 |
免费 | 29篇 |
国内免费 | 43篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 3篇 |
环保管理 | 83篇 |
综合类 | 155篇 |
基础理论 | 66篇 |
环境理论 | 1篇 |
污染及防治 | 30篇 |
评价与监测 | 11篇 |
社会与环境 | 34篇 |
灾害及防治 | 33篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 10篇 |
2020年 | 10篇 |
2019年 | 10篇 |
2018年 | 10篇 |
2017年 | 11篇 |
2016年 | 16篇 |
2015年 | 13篇 |
2014年 | 21篇 |
2013年 | 33篇 |
2012年 | 16篇 |
2011年 | 25篇 |
2010年 | 14篇 |
2009年 | 21篇 |
2008年 | 19篇 |
2007年 | 16篇 |
2006年 | 24篇 |
2005年 | 22篇 |
2004年 | 17篇 |
2003年 | 12篇 |
2002年 | 11篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 8篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有421条查询结果,搜索用时 15 毫秒
81.
Yuan-Na Xing Ying Guo Mei Xie Ru-Lang Shen 《Environmental pollution (Barking, Essex : 1987)》2009,157(4):1382-1387
A solid-phase microextration-based sampling method was employed to determine the concentrations of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) and its metabolites, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (DDD), 1,1-dichloro-2,2-bis(p-chlorophenyl)ethene (DDE) and 1-chloro-2,2-bis(p-chlorophenyl)ethene (DDMU), in two estuarine bays, Daya Bay and Hailing Bay, of South China. Six DDT components including p,p′-DDT, o,p′-DDD, p,p′-DDD, o,p′-DDE, p,p′-DDE, and p,p′-DDMU were detected in Hailing Bay, while only p,p′-DDD was found in Daya Bay. p,p′-DDD was the most abundant DDT component in both bays, sharply different from the previous finding in the water column of the Palos Verdes Shelf, California, USA that p,p′-DDE was prevalent. In addition, the occurrence of p,p′-DDMU (with a range of 0.047-0.21 ng/L in Hailing Bay) has not been reported around the globe, and its presence in our study region appeared to stem from dehydrochlorination of p,p′-DDD, favored under aerobic conditions, but further investigations are clearly needed to confirm the mechanism for generation of DDMU in estuarine environments. 相似文献
82.
There are two principal strategies for managing climate change risks: mitigation and adaptation. Until recently, mitigation
and adaptation have been considered separately in both climate change science and policy. Mitigation has been treated as an
issue for developed countries, which hold the greatest responsibility for climate change, while adaptation is seen as a priority
for the South, where mitigative capacity is low and vulnerability is high. This conceptual divide has hindered progress against
the achievement of the fundamental sustainable development challenges of climate change. Recent attention to exploring the
synergies between mitigation and adaptation suggests that an integrated approach could go some way to bridging the gap between
the development and adaptation priorities of the South and the need to achieve global engagement in mitigation. These issues
are explored through a case study analysis of climate change policy and practice in Bangladesh. Using the example of waste-to-compost
projects, a mitigation-adaptation-development nexus is demonstrated, as projects contribute to mitigation through reducing
methane emissions; adaptation through soil improvement in drought-prone areas; and sustainable development, because poverty
is exacerbated when climate change reduces the flows of ecosystem services. Further, linking adaptation to mitigation makes
mitigation action more relevant to policymakers in Bangladesh, increasing engagement in the international climate change agenda
in preparation for a post-Kyoto global strategy. This case study strengthens the argument that while combining mitigation
and adaptation is not a magic bullet for climate policy, synergies, particularly at the project level, can contribute to the
sustainable development goals of climate change and are worth exploring. 相似文献
83.
Chinstrap and gentoo penguins are endemic species that live year round south of the Antarctic Convergence. South polar skua is a migratory seabird that can be observed in Antarctica during the breeding season (i.e., austral summer). This study compares concentration and pattern of polybrominated diphenyl ethers (PBDEs) in eggs of seabirds breeding at King George Island, Antarctic Peninsula. PBDEs in south polar skua eggs are approximately 20 times higher than in penguin eggs suggesting that skuas are more exposed to contaminants during the non-breeding season when they migrate to waters of the northern hemisphere. The pattern of PBDE congeners also differs between south polar skua and penguin eggs. The latter exhibited a pattern similar to that found in the local biota. In contrast, the congener pattern in south polar skua eggs suggests that birds breeding at King George Island may winter in the northwestern Pacific Ocean. 相似文献
84.
南海中南部水域海水中重金属的分布特征 总被引:1,自引:0,他引:1
2010年秋季对我国南海部分海域进行调查,按照采样标准规范采集了16个站位不同水层的海水样品,采用附有ISIS进样系统的电感耦合等离子体质谱法直接测定了海水中痕量重金属Cr、Cu、Zn、As、Cd及Pb元素含量,考察了重金属在南海海水中分布状况;同时测定了海水样品的盐度、温度、pH、溶解有机碳(DOC)及溶解氧(DO),分析各项参数垂直分布变化规律及其与重金属的分布变化相关性。结果表明,南海海水中重金属含量较低,变化范围较小,除部分站位Pb元素外,重金属含量低于国家一类海水水质标准,不同站位间所有重金属总和分布没有明显差异性;重金属元素间分布变化趋势存在一定的相关性;盐度、温度、pH、DOC、DO与重金属分布变化存在着比较显著的相关性规律。 相似文献
85.
对疏浚后的南京南湖底泥的TP、TN和COD释放规律、补水后的水质状况以及藻类演替规律进行了调查。结果表明,上覆水中TP平均质量浓度基本不随自来水补入量的增加而发生变化,TN和COD质量浓度随自来水补入量的增加而增大;水体中的TP、TN和COD含量总体呈上升趋势;从2005年3月中旬起,出现藻类的大量繁殖,在2005年7月发生水华,藻类优势种由裸藻、隐藻和小环藻演替为裸藻、栅藻和韦斯藻,藻类总量由2005年3月的3.7×106L-1上升到2006年4月的1.5×107L-1。 相似文献
86.
87.
陇南长江流域经济发展和生态重建战略研究 总被引:2,自引:1,他引:1
白永平 《长江流域资源与环境》2000,9(2):189-195
陇南长江流域大多地处嘉陵江上游的源头地区,是一个资源较为富集但经济相对落后、生态环境脆弱且人口压力较大的丘陵山区。本文从可持续发展的角度出发,着眼世纪之交摆脱贫困与奔向小康转换时期经济发展和生态重建的协调演进,提出产业结构调整的基本思路是立足山区优势发展特色农业,市场配置资源、培植支柱工业,商贸、旅游并举、突出第三产业、强化基础设计、增强发展后劲;空间结构重组的战略构想是重点发展东部经8济重心区、 相似文献
88.
Antarctic fur seals (Arctocephalus gazella) were commercially exploited on the subantarctic island of South Georgia for over 100 years and nearly driven to extinction. Since the cessation of harvesting, however, their populations have rebounded, and they are now often considered a nuisance species whose impact on the terrestrial landscape should be mitigated. Any evaluation of their current population requires the context provided by their historic, pre-exploitation abundance, lest ecologists fall prey to shifting baseline syndrome in which their perspective on current abundance is compared only with an altered state resulting from past anthropogenic disturbance. Estimating pre-exploitation abundance is critical to defining species recovery and setting recovery targets, both of which are needed for the International Union for the Conservation of Nature's recent efforts to develop a green list of recovering species. To address this issue, we reconstructed the South Georgia fur seal harvest from 1786 to 1908 from ship logbooks and other historical records and interpolated missing harvest data as necessary with a generalized linear model fit to the historical record. Using an approximate Bayesian computation framework, harvest data, and a stochastic age-structured population model, we estimated the pre-exploitation abundance of Antarctic fur seals on South Georgia was 2.5 million females (95% CI 1.5–3.5 million). This estimate is similar to recent abundance estimates, and suggests current populations, and the ecological consequences of so many fur seals on the island, may be similar to conditions prior to human harvest. Although the historic archive on the fur sealing era is unavoidably patchy, the use of archival records is essential for reconstructing the past and, correspondingly, to understanding the present. Article impact statement: Defining species recovery requires an understanding of baseline population state, which can be estimated through statistical methods. 相似文献
89.
90.
Handmer JW 《Disasters》1985,9(4):279-285
In 1977 the Government of New South Wales introduced a flood prone lands policy which attempted to break with the past emphasis on structural works. Cornerstones of the policy were the preparation of floodplain maps, and use of the 1:100 (100 year or 1%) flood to delineate floodplains and 1:20 flood for floodway definition. The fiscal and regulatory elements of the policy were to be applied more or less uniformly within the two zones. At first there was little effective opposition to the program, but this changed when large areas of Sydney, which had not been inundated since development, were mapped. Local government concern over issues of legal liability led to decisions which in turn prompted opposition to the policy from residents' action groups and property development interests. A perceived drop in property values provided the main motivation for action by residents. This pressure for change, which intensified just before the 1984 state election, saw the policy overturned.
The new policy gives local government greater responsibility for floodplain management. State authorities have withdrawn from floodplain mapping, although technical advice will continue to be provided, and there are no longer any uniform floodplain or floodway definitions. Policy implementation is to be guided by a Manual which attempts to define flood hazard in terms of both physical and social criteria. 相似文献
The new policy gives local government greater responsibility for floodplain management. State authorities have withdrawn from floodplain mapping, although technical advice will continue to be provided, and there are no longer any uniform floodplain or floodway definitions. Policy implementation is to be guided by a Manual which attempts to define flood hazard in terms of both physical and social criteria. 相似文献