全文获取类型
收费全文 | 1323篇 |
免费 | 95篇 |
国内免费 | 223篇 |
专业分类
安全科学 | 273篇 |
废物处理 | 10篇 |
环保管理 | 141篇 |
综合类 | 546篇 |
基础理论 | 317篇 |
环境理论 | 4篇 |
污染及防治 | 61篇 |
评价与监测 | 45篇 |
社会与环境 | 185篇 |
灾害及防治 | 59篇 |
出版年
2024年 | 8篇 |
2023年 | 26篇 |
2022年 | 51篇 |
2021年 | 62篇 |
2020年 | 52篇 |
2019年 | 47篇 |
2018年 | 53篇 |
2017年 | 56篇 |
2016年 | 66篇 |
2015年 | 67篇 |
2014年 | 64篇 |
2013年 | 130篇 |
2012年 | 77篇 |
2011年 | 89篇 |
2010年 | 79篇 |
2009年 | 68篇 |
2008年 | 68篇 |
2007年 | 90篇 |
2006年 | 91篇 |
2005年 | 65篇 |
2004年 | 50篇 |
2003年 | 49篇 |
2002年 | 41篇 |
2001年 | 36篇 |
2000年 | 26篇 |
1999年 | 30篇 |
1998年 | 19篇 |
1997年 | 14篇 |
1996年 | 6篇 |
1995年 | 16篇 |
1994年 | 16篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1984年 | 1篇 |
1982年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1641条查询结果,搜索用时 15 毫秒
981.
目前全国生态保护红线划定工作基本结束,开展生态保护红线监管工作事关国家生态安全,是今后我国生态保护的重要举措和重点工作。依托国家生态保护红线监管平台监管业务系统,研究基于卫星遥感的生态保护红线人类活动提取方法和流程,并以宁夏为例,验证其科学性和可靠性。结果显示:基于卫星遥感技术构建的方法精度较高,可操作性较强,为生态保护红线人类活动监管提供了思路;使用该技术方法的作业效率相比人工解译提升了2~3倍,提取的宁夏生态破坏问题图斑准确率达到66%,人类活动提取准确率更是达到95%,能够满足生态保护红线人类活动监管需求;宁夏55%的县(区、市)生态保护红线内发现新增和规模扩大人类活动,从空间分布来看,主要集中在西部和南部,北部和中部分布较少,其中彭阳县、沙坡头区和中宁县人类活动影响面积最大。 相似文献
982.
Silvia Ceauşu Rose A. Graves Alexander K. Killion Jens-Christian Svenning Neil H. Carter 《Conservation biology》2019,33(3):543-553
Sustaining wildlife populations, which provide both ecosystem services and disservices, represents a worldwide conservation challenge. The ecosystem services and Ostrom's social–ecological systems frameworks have been adopted across natural and social sciences to characterize benefits from nature. Despite their generalizability, individually they do not include explicit tools for addressing the sustainable management of many wildlife populations. For instance, Ostrom's framework does not specifically address competing perspectives on wildlife, whereas the ecosystem services framework provides a limited representation of the social and governance context wherein such competing perspectives are embedded. We developed a unified social–ecological framework of ecosystem disservices and services (SEEDS) that advances both frameworks by explicitly acknowledging the importance of competing wildlife perspectives embedded in the social and governance contexts. The SEEDS framework emulates the hierarchical structure of Ostrom's social–ecological systems, but adds subsystems reflecting heterogeneous stakeholder views and experiences of wildlife-based services and disservices. To facilitate operationalizing SEEDS and further broader analyses across human–wildlife systems, we devised a list of variables to describe SEEDS subsystems, such as types and level of services and disservices, cost and benefit sharing, and social participation of stakeholders. Steps to implement SEEDS involve engaging local communities and stakeholders to define the subsystems, analyze interactions and outcomes, and identify leverage points and actions to remedy unwanted outcomes. These steps connect SEEDS with other existing approaches in social–ecological research and can guide analyses across systems or within individual systems to provide new insights and management options for sustainable human–wildlife coexistence. 相似文献
983.
Kim S. Jacobsen Amy J. Dickman David W. Macdonald Susana Mourato Paul Johnson Lovemore Sibanda Andrew Loveridge 《Conservation biology》2021,35(4):1233-1244
Conflict with humans is one of the major threats facing the world's remaining large carnivore populations, and understanding human attitudes is key to improving coexistence. We surveyed people living near Hwange National Park about their attitudes toward coexisting with lions. We used ordinal regression models with the results of the survey to investigate the importance of a range of tangible and intangible factors on attitudes. The variables investigated included the costs and benefits of wildlife presence, emotion, culture, religion, vulnerability, risk perception, notions of responsibility, and personal value orientations. This was for the purpose of effectively tailoring conservation efforts but also for ethical policy making. Intangible factors (e.g., fear and ecocentric values) were as important as, if not more important than, tangible factors (such as livestock losses) for understanding attitudes, based on the effect sizes of these variables. The degree to which participants’ fear of lions interfered with their daily activities was the most influential variable. The degree to which benefits accrue to households from the nearby protected area was also highly influential, as was number of livestock lost, number of dependents, ecocentric value orientation, and participation in conflict mitigation programs. Contrary to what is often assumed, metrics of livestock loss did not dominate attitudes to coexistence with lions. Furthermore, we found that socioeconomic variables may appear important when studied in isolation, but their effect may disappear when controlling for variables related to beliefs, perceptions, and past experiences. This raises questions about the widespread reliance on socioeconomic variables in the field of human–wildlife conflict and coexistence. To facilitate coexistence with large carnivores, we recommend measures that reduce fear (through education and through protective measures that reduce the need to be fearful), reduction of livestock losses, and ensuring local communities benefit from conservation. Ecocentric values also emerged as influential, highlighting the need to develop conservation initiatives tailored to local values. 相似文献
984.
设立保护地是保护生物多样性的最有效举措。“半个地球”愿景提出将50%的面积纳入保护地,并有效保护85%的物种,是全球生态保护的目标。IUCN保护地分类系统是国际通用的标准,一系列优先保护模块研究则对保护地的识别进行着探索。本文旨在通过对这些模块的保护目标、识别标准等进行分析,为保护地科学识别提供合理参考。主要结论如下:(1)物种、栖息地与人类活动是各模块的主要考虑要素,识别标准包括物种丰富度、生境转变率、人类活动强度等;(2)各模块对生境转变率的考虑有“亡羊补牢”和“未雨绸缪”两种思路,对人类活动强度的考虑有直接和间接之分;(3)各模块分布面积占比在5.77%~25.32%之间,总范围占全球陆表的55.59%,超过了“半个地球”愿景的目标比例。 相似文献
985.
Nathan J. Bennett Robin Roth Sarah C. Klain Kai M. A. Chan Douglas A. Clark Georgina Cullman Graham Epstein Michael Paul Nelson Richard Stedman Tara L. Teel Rebecca E. W. Thomas Carina Wyborn Deborah Curran Alison Greenberg John Sandlos Diogo Veríssimo 《Conservation biology》2017,31(1):56-66
Despite broad recognition of the value of social sciences and increasingly vocal calls for better engagement with the human element of conservation, the conservation social sciences remain misunderstood and underutilized in practice. The conservation social sciences can provide unique and important contributions to society's understanding of the relationships between humans and nature and to improving conservation practice and outcomes. There are 4 barriers—ideological, institutional, knowledge, and capacity—to meaningful integration of the social sciences into conservation. We provide practical guidance on overcoming these barriers to mainstream the social sciences in conservation science, practice, and policy. Broadly, we recommend fostering knowledge on the scope and contributions of the social sciences to conservation, including social scientists from the inception of interdisciplinary research projects, incorporating social science research and insights during all stages of conservation planning and implementation, building social science capacity at all scales in conservation organizations and agencies, and promoting engagement with the social sciences in and through global conservation policy‐influencing organizations. Conservation social scientists, too, need to be willing to engage with natural science knowledge and to communicate insights and recommendations clearly. We urge the conservation community to move beyond superficial engagement with the conservation social sciences. A more inclusive and integrative conservation science—one that includes the natural and social sciences—will enable more ecologically effective and socially just conservation. Better collaboration among social scientists, natural scientists, practitioners, and policy makers will facilitate a renewed and more robust conservation. Mainstreaming the conservation social sciences will facilitate the uptake of the full range of insights and contributions from these fields into conservation policy and practice. 相似文献
986.
Plans to replace an aging diesel backup energy plant with liquid natural gas (LNG) generators in Whitehorse, Yukon, resulted in a public outcry, involving community meetings, massive petitions, and demonstrations. Are these civil society protests just a case of a local siting dispute – a response to an unwanted industrial site in an urban neighborhood? Here, it is argued that siting debates are not the driver of these campaigns, but instead are harnessed by activists to advance a broader environmental movement. By linking the LNG project to more distant extraction, involving hydraulic fracturing (‘fracking’), movement leaders portray the entire territory as part of the ‘local’ for Whitehorse residents. Movement leaders rely upon two key mechanisms: claiming insider status, and identifying visible symbols. This case reveals the strategic use by environmental movements of local concerns to recruit support for broader campaigns, and the value of local, place-based activism for broader environmental movements. 相似文献
987.
D. Orlinskii I. Priputina A. Popova A. Shalanda T. Tsongas G. Hinman W. Butcher 《Environmental geochemistry and health》2001,23(4):313-328
Statistical data on different sicknesses have been processed to evaluate the dynamics of human health in Serpukhov City (an administrative centre in the Moscow region of Russia) and to estimate the contribution of ecological factors to the total level of morbidity. Chlorinated biphenyls (PCBs) appear to be among the most dangerous contaminants of the ecosystem that includes the urban areas and those lands, which are actively used for vegetable production. A preliminary health risk calculation for PCBs has been done using soil contamination data. We estimated the share of cancer attributable to soil contamination with PCBs to be approximately 6% of the value of total cancer morbidity in Serpukhov. The highest level of soil pollution by PCBs occurred in the district of the city where the highest values of some other sicknesses also were located. The results of this study could be useful for decision-making and planning of environmental policy in the city. 相似文献
988.
Vertebrate animals can be injured or threatened with injury through human activities, thus warranting their “rescue.” Details of wildlife rescue, rehabilitation, release, and associated research (our 4 Rs) are often recorded in large databases, resulting in a wealth of available information. This information has huge research potential and can contribute to understanding of animal biology, anthropogenic impacts on wildlife, and species conservation. However, such databases have been little used, few studies have evaluated factors influencing success of rehabilitation and/or release, recommended actions to conserve threatened species have rarely arisen, and direct benefits for species conservation are yet to be demonstrated. We therefore recommend that additional research be based on data from rescue, rehabilitation, and release of animals that is broader in scope than previous research and would have community support. 相似文献
989.
Mehdi Ghasemi Jebrail Nasleseraji Sedigheh Hoseinabadi Mohsen Zare 《International journal of occupational safety and ergonomics》2013,19(2):203-209
Introduction. Studying human errors as a risk factor in the occurrence of accidents is necessary. Thus, the aim of this study was to identify, predict and control human errors in industrial control units. Method. This is a case study carried out using SHERPA in the first unit of Zagros Methanol of Asalooyeh, Iran, and its subunits. To collect the required data, various methods were used: observing, interviewing processing specialists and control unit operators, and studying technical documents and records. Results. In total, 222 human errors were identified in various occupational tasks. This study showed that 48.62% of them were action errors, 31.97% were checking errors, 6.75% were retrieval errors, 11.70% were communication errors and 0.90% were selection errors. Conclusion. It can be inferred that this method is appropriate for different industries, and it is useful for identifying human errors leading to hazardous accidents. 相似文献
990.
Agnieszka Kurczewska Jacek Leśnikowski 《International journal of occupational safety and ergonomics》2013,19(1):77-87
This paper presents the concept of active variable thermoinsulation clothing for users working in low temperatures. Those garments contain heating inserts regulated by a microprocessor temperature controller. This paper also presents the results of tests carried out on the newly designed garments. 相似文献