全文获取类型
收费全文 | 4029篇 |
免费 | 36篇 |
国内免费 | 19篇 |
专业分类
安全科学 | 76篇 |
废物处理 | 268篇 |
环保管理 | 331篇 |
综合类 | 412篇 |
基础理论 | 854篇 |
环境理论 | 8篇 |
污染及防治 | 1465篇 |
评价与监测 | 377篇 |
社会与环境 | 279篇 |
灾害及防治 | 14篇 |
出版年
2023年 | 47篇 |
2022年 | 108篇 |
2021年 | 158篇 |
2020年 | 64篇 |
2019年 | 79篇 |
2018年 | 159篇 |
2017年 | 149篇 |
2016年 | 219篇 |
2015年 | 118篇 |
2014年 | 239篇 |
2013年 | 379篇 |
2012年 | 280篇 |
2011年 | 298篇 |
2010年 | 227篇 |
2009年 | 164篇 |
2008年 | 229篇 |
2007年 | 247篇 |
2006年 | 181篇 |
2005年 | 160篇 |
2004年 | 114篇 |
2003年 | 93篇 |
2002年 | 83篇 |
2001年 | 46篇 |
2000年 | 46篇 |
1999年 | 27篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 18篇 |
1994年 | 12篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1967年 | 4篇 |
1966年 | 4篇 |
1965年 | 2篇 |
1964年 | 5篇 |
1962年 | 3篇 |
1959年 | 4篇 |
1958年 | 15篇 |
1957年 | 5篇 |
1955年 | 2篇 |
排序方式: 共有4084条查询结果,搜索用时 15 毫秒
981.
J. M. Mancilla-Leytón A. Martín Vicente C. Parejo-Farnés R. Fernández-Ales M. J. Leiva 《Russian Journal of Ecology》2014,45(5):384-390
We have studied the effect of goat grazing on the shrub understory of a pine forest situated in a protected area (Doñana Natural Park). Along three years we have studied the changes in phytovolume, flammability, species richness and diversity in a grazed shrubland and in a control area not grazed by the goats. We studied also food preferences of the goats and the ability of the goats to disperse the seeds of the plants they eat. Goat grazing significantly reduced shrub biomass and flammability, decreasing the risk of forest fire. Goats selected the species they eat, changing the pattern of selection throughout the year. Grazing reduced shrub diversity, but did not affected species richness. The goats can also potentially disperse the seeds of some of the species they eat, since the seeds were able to pass through the goat’s gut and germinated afterwards. Goat grazing on scrub vegetation can be used as an effective tool for the control of shrubs in protected forest areas, without losing biodiversity. 相似文献
982.
Núñez-Delgado Avelino Álvarez-Rodríguez Esperanza Fernández-Sanjurjo María J. 《Environmental science and pollution research international》2019,26(12):11511-11513
Environmental Science and Pollution Research - 相似文献
983.
Yadira Ansoar-Rodríguez Cintya A. Christofoletti Jorge E. Correia Raphael B. de Souza Cristina Moreira-de-Sousa Ana Claudia de Castro Marcato 《Journal of environmental science and health. Part. B》2016,51(12):881-887
Liver is very sensitive to environmental contaminants such as pesticides, it being the first target of toxicity of a substance. The objective of this study was to investigate the possible effects of the insecticide imidacloprid (IMI) on the liver of Oreochromis niloticus according concentrations used for growing sugarcane. A semi-quantitative analysis of histopathological alterations of IMI on liver was performed by light microscopy and cellular labeling of heat shock proteins (HSP70) by immunohistochemistry. The most common changes in liver at all concentrations of IMI were hydropic degeneration, pyknotic nuclei, and loss of cell limits. Steatosis and increased levels of HSP70 were detected in hepatocytes with the highest concentration of IMI. In conclusion, the tested concentrations of IMI induced histopathological changes in the liver of O. niloticus and active defence mechanisms to maintain the morphophysiological integrity of the liver. This insecticide has a toxicity potential for these fish, which is a non-target organism of its action. 相似文献
984.
Ortega Zaida Mencía Abraham Pérez-Mellado Valentín 《Behavioral ecology and sociobiology》2017,71(1):1-10
Behavioral Ecology and Sociobiology - Pre-copulatory sexual cannibalism (Pre-SC), where females attack and consume courting males, is considered an extreme case of sexual conflict. Different... 相似文献
985.
986.
I. S. Sheremet’ev Yu. N. Zhuravlev N. S. Korytin V. N. Bol’shakov 《Russian Journal of Ecology》2011,42(6):480-484
The study summarizes the results of a long-term research on the factors influencing the structure of ungulate communities
in the southern Russian Far East and Middle Urals. The effect of these factors in communities of the southern Far East is
largely complicated by interspecific relationships between ungulates. The role of such relationships in the Middle Urals is
less apparent, and the territorial distribution of ungulates is largely determined by anthropogenic transformation of habitats. 相似文献
987.
Joana I. Robalo Ana M. Crespo Rita Castilho Sara M. Francisco Maria C. P. Amorim Vítor C. Almada 《Marine Biology》2013,160(9):2461-2467
In this paper, we compare the populations of the Lusitanian toadfish Halobatrachus didactylus along the Portuguese shore, using a putative fragment of the mitochondrial control region and the first intron of the S7 ribosomal protein gene. This demersal species ranges from the tropical West African coast to the Iberian Peninsula and the Mediterranean, having its northern limit in the Tagus River. For the putative control region, a single haplotype occurs in all fish from Tagus and Sado (the location immediately to the south) with a clear increase in diversity to the South, peaking at Algarve (south Portugal). The data seem to point to a very recent Holocenic colonization of Tagus and Sado from the South (possibly Algarve). We suggest that even small oscillations in sea surface temperature (SST) may cause local extinctions and subsequent recolonizations in populations of thermophilic fish that are at the cold limit of their distributions. 相似文献
988.
Silvestre García de Jalón Silvia Silvestri Andrew P. Barnes 《Regional Environmental Change》2017,17(2):399-410
Livestock systems play an important role in the livelihoods of many rural communities in Sub-Saharan Africa while being responsible for an important share of human-induced greenhouse gas emissions. This study aimed to evaluate the potential for adoption of climate smart agricultural practices in Sub-Saharan livestock systems, related to the improvement in feed, animal husbandry, and grassland management. These practices present productivity and mitigation benefits and in some cases may also contribute to enhance resilience. In this study, we used a data set of 1538 farm households across nine Sub-Saharan countries. A mixed logit model was used to assess the influence on adoption and to estimate the probability of adoption. Our results show that there seems to be stronger influence of physical and financial capitals on adoption than the other capitals. Different types of capitals influence the uptake of different agricultural practices. Yet the probability of adoption would change across countries. The results of this study could help to refine adoption estimates calculated through global or regional modelling approaches and to inform the design of policies to better target investments in order to foster adoption. 相似文献
989.
Baumann Matthias Israel Christoph Piquer-Rodríguez María Gavier-Pizarro Gregorio Volante José Norberto Kuemmerle Tobias 《Regional Environmental Change》2017,17(4):1179-1191
Regional Environmental Change - The dry forests of Latin America are among the most dynamic deforestation frontiers in the world and are important carbon and biodiversity reservoirs. Our knowledge... 相似文献
990.
Anna Lyth Claudia Baldwin Aidan Davison Pedro Fidelman Kate Booth Caroline Osborne 《Local Environment》2017,22(1):1-21
The number and diversity of civil society or third sector sustainability organisations (TSSOs) have increased in recent decades. TSSOs play a prominent role in local approaches to sustainability. However, the contributions made by TSSOs are not fully understood, beyond a limited suite of quantifiable outputs and impacts. In this qualitative study, we examine how four TSSOs from two Australian regions, Tasmania and Queensland's Sunshine Coast, contribute to social transformation beyond discrete outputs. We examine the operation, ethos, scope and influence of these organisations over time. In so doing, we identify three common ways in which these organisations facilitate social change: by (i) enhancing social connectivity through boundary work; (ii) mobilising participatory citizenship and (iii) contributing to social learning. We conclude that TSSOs contribute significantly to the systemic social conditions that enable change for sustainability and the development of community resilience and well-being, but do so in ways undervalued by existing metrics, formal evaluation processes and funding models. Clearer recognition of, and strategic emphasis on, these qualitative contributions to social transformation is vital in ensuring that TSSOs remain viable and effective over the long term. 相似文献