全文获取类型
收费全文 | 1978篇 |
免费 | 20篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 57篇 |
废物处理 | 138篇 |
环保管理 | 164篇 |
综合类 | 203篇 |
基础理论 | 409篇 |
环境理论 | 2篇 |
污染及防治 | 686篇 |
评价与监测 | 186篇 |
社会与环境 | 161篇 |
灾害及防治 | 10篇 |
出版年
2023年 | 22篇 |
2022年 | 68篇 |
2021年 | 58篇 |
2020年 | 36篇 |
2019年 | 50篇 |
2018年 | 69篇 |
2017年 | 70篇 |
2016年 | 108篇 |
2015年 | 70篇 |
2014年 | 105篇 |
2013年 | 196篇 |
2012年 | 137篇 |
2011年 | 165篇 |
2010年 | 108篇 |
2009年 | 89篇 |
2008年 | 97篇 |
2007年 | 101篇 |
2006年 | 82篇 |
2005年 | 69篇 |
2004年 | 57篇 |
2003年 | 44篇 |
2002年 | 47篇 |
2001年 | 26篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 12篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 14篇 |
1994年 | 6篇 |
1993年 | 8篇 |
1992年 | 9篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1982年 | 3篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
1958年 | 1篇 |
1956年 | 1篇 |
1915年 | 1篇 |
排序方式: 共有2016条查询结果,搜索用时 15 毫秒
991.
Abstract: Privately owned lands support a large portion of the biodiversity in some areas, but procedures for identifying those private lands critical to the maintenance of biodiversity vary tremendously. We used habitat-based distribution maps in combination with population conservation goals to help identify strategic habitats on private lands in Florida. We used a vegetation map, occurrence data, and published life-history information to create habitat-based distribution maps for 179 rare taxa. We estimated the security of 130 of the taxa by overlaying public land boundaries on habitat maps and then estimating whether conservation lands satisfied a population goal of supporting at least 10 populations of approximately 200 breeding adults. The remaining taxa were evaluated in terms of number of occurrence records on conservation lands. Of the 179 taxa evaluated, existing conservation lands did not adequately protect 56. We then identified habitats on private lands that could best satisfy the minimum conservation goal or else significantly enhance the survival potential of inadequately protected taxa. Strategic habitats included a mix of large and small sites, incorporated some corridor or stepping-stone connections among habitat patches, and protected multiple species. Additional strategic habitats were identified for shorebirds, four natural plant communities, and 105 globally rare plants. The strategic habitats identified in Florida cover 1.65 million ha (12% of the land area) and would cost $8.2 billion (about 15% of Florida's annual state budget) to purchase and $122 million per year to manage. Existing conservation lands account for 3.07 million ha (22% of the land area). 相似文献
992.
Philip Lowe Judy Clark Graham Cox 《Journal of Environmental Planning and Management》1993,36(1):101-115
Debate on the economic valuation of the countryside is typically polarized between absolutist critics who would deny it any valid role and equally fervid proponents who see its techniques as the only way of integrating the environment into policy making. Such debate is structured by conflicting notions of rights, responsibilities and values, rather than by consideration of the role of technique in practical policy‐making. This paper attempts to take the debate forward and begins by examining the ways in which rights, responsibilities and values have been historically created. The techniques of economic valuation rest on particular conceptions of these, making them irreducibly political, and at the same time their results are often used to justify political decisions. Yet the proper role of technique ought to be to explore options. Provided that the sort of clarification that economic valuation offers is understood, it may, along with other types of technique, be used to open up the decision making process. 相似文献
993.
994.
995.
Oteiza Juan Martín Prez Verónica Emilse Pereyra Dayana Jaureguiberry María Virginia Sánchez Gloria Sant’Ana Anderson S. Barril Patricia Angélica 《Food and environmental virology》2022,14(2):170-177
Food and Environmental Virology - Berries have been implicated as the probable vehicle of infection in multiple outbreaks of norovirus and hepatitis A virus (HAV). These foods often receive minimal... 相似文献
996.
Vaverková Magdalena Adamcová Dana Kotrchová Lenka Merna Jan Hermanová Soňa 《Journal of Material Cycles and Waste Management》2018,20(1):414-420
Journal of Material Cycles and Waste Management - The present work is aimed on the study of degradation of poly(ethylene terephthalate-co-lactate) copolyesters, prepared by chemical modification of... 相似文献
997.
Lopes Géssica de Oliveira Aragão Walessa Alana Bragança Nascimento Priscila Cunha Bittencourt Leonardo Oliveira Oliveira Ana Carolina Alves Leão Luana Ketlen Reis Alves-Júnior Sergio Melo Pinheiro João de Jesus Viana Crespo-Lopez Maria Elena Lima Rafael Rodrigues 《Environmental science and pollution research international》2021,28(9):10918-10930
Environmental Science and Pollution Research - This study aimed to investigate the effects of lead (Pb) exposure on parotid and submandibular glands through morphological aspects as well as the... 相似文献
998.
Pereira Diogo Rocha Luciana S. Gil María V. Otero Marta Silva Nuno J. O. Esteves Valdemar I. Calisto Vânia 《Environmental science and pollution research international》2021,28(15):18314-18327
Environmental Science and Pollution Research - The main goal of this work was to produce an easily recoverable waste-based magnetic activated carbon (MAC) for an efficient removal of the... 相似文献
999.
Cristina Quintas-Soriano Dainee M. Gibson Jodi S. Brandt María D. Lpez-Rodríguez Javier Cabello Pedro A. Aguilera Antonio J. Castro 《Ambio》2021,50(1):150
Conservation easements are the fastest growing private conservation strategy in the United States. However, mechanisms to assess private land conservation as well as their support by the general public are not well understood. This study uses the ecosystem services framework for assessing existing private lands in Idaho and identifies areas for future conservation easements. Using conservation targets of the land trust as a guide for selecting ecosystem services, we (a) mapped the spatial delivery of conservation targets across public and private lands, (b) explored public awareness in terms of social importance and vulnerability, and (c) mapped future priority areas by characterizing conservation bundles. We found that public lands provided the highest levels of conservation targets, and we found no difference in conservation target provision between private areas and conservation easements. The spatial characterization of conservation target bundles identified potential future priority areas for conservation easements, which can guide planning of land trust conservation efforts.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01323-x) contains supplementary material, which is available to authorized users. 相似文献
1000.
Sarmiento Jon Marx P. Mendez Queenie Lynly T. Estaña Leo Manuel B. Giray Evette S. Nañola Cleto L. Alviola Pedro A. 《Environment, Development and Sustainability》2021,23(11):16786-16802
Environment, Development and Sustainability - The Philippine fisheries sector continues to play a critical role in the livelihood of coastal households; however, the country’s fisheries... 相似文献