全文获取类型
收费全文 | 320篇 |
免费 | 11篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 27篇 |
环保管理 | 40篇 |
综合类 | 51篇 |
基础理论 | 57篇 |
环境理论 | 1篇 |
污染及防治 | 106篇 |
评价与监测 | 24篇 |
社会与环境 | 17篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 8篇 |
2022年 | 19篇 |
2021年 | 16篇 |
2020年 | 7篇 |
2019年 | 13篇 |
2018年 | 17篇 |
2017年 | 14篇 |
2016年 | 20篇 |
2015年 | 12篇 |
2014年 | 22篇 |
2013年 | 23篇 |
2012年 | 11篇 |
2011年 | 27篇 |
2010年 | 10篇 |
2009年 | 12篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 9篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1972年 | 1篇 |
排序方式: 共有333条查询结果,搜索用时 15 毫秒
101.
Economic Analysis of Summer Fallow Management to Reduce Take-All Disease and N Leaching in a Wheat Crop Rotation 总被引:1,自引:0,他引:1
Stéphane De Cara Florence Jacquet Arnaud Reynaud Gaël Goulevant Marie-Hélène Jeuffroy Françoise Montfort Philippe Lucas 《Environmental Modeling and Assessment》2011,16(1):91-105
This paper addresses the question of summer cover-crop adoption by farmers in presence of a risk of yield loss due to take-all disease and climate variability. To analyze the public incentives needed to encourage farmers to adopt summer cover crops as a means of reducing N leaching, we combine outputs from an economic, an epidemiological and an agronomic model. The economic model is a simple model of choice under risk. The farmer is assumed to choose among a range of summer fallow managements and input uses on the basis of the expected utility criterion (HARA assumption) in presence of both climate and take-all risks. The epidemiological model proposed by Ennaïfar et al. (Eur J Plant Pathol 118:127–143, 2007) is used to determine the impact of take all on yields and N uptake. The crop-soil model (STICS) is used to compute yield developments and N leaching under various management options and climatic conditions. The input parameters are chosen to match the conditions prevailing in Grignon, located in the main wheat-growing area in France. Eight management systems are examined: four summer fallow managements: ‘wheat volunteers’ (WV), ‘bare soil’ (BS), ‘early mustard’, ‘late mustard’, and two input intensities. We show that the optimal systems are BS (WV) when the take-all risk is (not) taken into account by agents. We then compute the minimum payment to each system such that it emerges in the optimum. We thus derive the required amounts of transfer needed to trigger catch-crop adoption. The results of the Monte Carlo sensitivity analysis show that the ranking of management systems is robust over a wide range of input parameters. 相似文献
102.
Monferrán MV Galanti LN Bonansea RI Amé MV Wunderlin DA 《Journal of environmental monitoring : JEM》2011,13(2):398-409
We report a combined two-year seasonal monitoring of Suquía River basin using both chemical parameters and biomarkers measured in Jenynsia multidentata, aiming to correlate external levels of contaminants with the response of oxidative stress biomarkers in this fish. Identified pollution sources correspond to city sewage as well as agricultural and small industry activities downstream from Córdoba city. Physicochemical parameters integrated into a water quality index (WQI) were measured in Suquía River during dry and wet seasons. Ag, Mn, Cu, Cr, Ni, Fe, Pb and Zn were also monitored in water and sediment samples. Biomarkers include detoxication and antioxidant enzymes: catalase (CAT), glutathione peroxidase (GPX), glutathione S-transferase (GST) and glutathione reductase (GR). Enzymes showed a pollution dependent response, with increased activities in fish collected close to the sewage exit and progressive drop further downstream, matching changes in the Water Quality index. The combined use of biomarkers with water quality parameters allowed both the identification of pollution sources and the evaluation of effects of contaminants on the aquatic biota. 相似文献
103.
Dynamical models usually assume that predation occurs between mature stages and/or between mature and immature stages. In this work a stage-structured discrete time model is developed for a system where intraguild predation takes place only in the course of immature stages of predator and its prey. Therefore, the proposed mathematical setup demands functional relations linking predation in immature life stages with survival and fecundity in mature stages. The behavior of the model is examined in order to investigate the interplay among predator attack rate, its satiation of prey consumption and the success of intraguild predator invasion. 相似文献
104.
Cardium edule L. and C. glaucum Bruguière are two sibling species of cockles commonly found in littoral systems along the Portuguese coast, where they sometimes occur as mixed populations. The problem of morphological separation of these two cockle species has not been completely solved. Indeed, the distinctive morphological criterion proposed by Brock after identifying the specimens by means of electrophoretic patterns of hepatopancreatic malate dehydrogenase was not effective when applied to Portuguese Cardium spp. The object of the present study was to establish morphological discrimination criteria for distinguishing Portuguese C. edule and C. glaucum on the basis of initial identification of individuals through the enzymatic criterion established by Brock. Cockles were collected from 1988 to 1991 at 16 estuarine and lagoonal systems along the Portuguese coast. Hepatopancreatic extracts were submitted to horizontal starch gel electrophoresis following Brock's procedure. The malate dehydrogenase patterns obtained were identical to those found by Brock. Clear interspecific differences in the leucine aminopeptidase and esterase isozyme systems were also detected. The morphological study of the shells involved 7 morphometric and 9 qualitative and semiquantitative characters. Canonical variate analysis of the morphometric characters showed that these could not be used for identification purposes. However, a clear separation between the two species was obtained by a principal-component analysis of qualitative and semiquantitative characters. The characters mainly useful for distinguishing between the two species were valve profile, shape of ventral valve junction, type of calcareous scales and shell colour. 相似文献
105.
Machado W Luiz-Silva W Sanders CJ Patchineelam SR 《Journal of environmental radioactivity》2008,99(8):1329-1334
Concentrations of fertilizer industry-derived P (up to 3.4%), Ca (up to 6.1%), (226)Ra (up to 744 Bq kg(-1)) and (210)Pb (up to 1317 Bq kg(-1)) at least one order of magnitude above natural levels were recorded in a sediment core from Morr?o River estuary (SE Brazil). Unsupported (210)Pb (= total (210)Pb-(226)Ra) activities unexplained by atmospheric fallout and deviations from the radionuclides secular equilibrium also indicated strong anomalies. Anomalous constituents were positively correlated with each other and negatively correlated with clay mineral-bearing elements. These negative correlations were explained by a depletion of natural sediment constituents due to a dilution caused by elevated inputs of steel industry-derived elements (mainly by Fe levels up to 24%). Absolute data and normalizations by a proxy for clays (Al) and anthropogenic Fe evidenced variabilities in the quality of coastal and land-derived sediment inputs, mainly due to changes in the relative contributions from industrial sources. 相似文献
106.
van Drooge Barend L. Garatachea Roger Reche Cristina Titos Gloria Alastuey Andres Lyamani Hassan Alados-Arboledas Lucas Querol Xavier Grimalt Joan O. 《Environmental science and pollution research international》2022,29(24):36255-36272
Environmental Science and Pollution Research - PM10 was collected during an EMEP winter campaign of 2017–2018 in two urban background sites in Barcelona (BCN) and Granada (GRA), two... 相似文献
107.
Eugenio Erika de Queiros Campisano Ivone Sampaio Pereira de Castro Aline Machado Coelho Maria Alice Zarur Langone Marta Antunes Pereira 《Journal of Polymers and the Environment》2022,30(4):1627-1637
Journal of Polymers and the Environment - The search for a straightforward technology for post-consumer poly(ethylene terephthalate) (PC-PET) degradation is essential to develop a circular economy.... 相似文献
108.
Estevez-Areco Santiago Guz Lucas Candal Roberto Goyanes Silvia 《Journal of Polymers and the Environment》2022,30(7):2812-2823
Journal of Polymers and the Environment - Electrospinning of water-soluble polymers is considered a green process for encapsulating active compounds in polymeric nanofibers, but generally the... 相似文献
109.
110.