全文获取类型
收费全文 | 163篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 4篇 |
环保管理 | 21篇 |
综合类 | 23篇 |
基础理论 | 43篇 |
环境理论 | 1篇 |
污染及防治 | 53篇 |
评价与监测 | 8篇 |
社会与环境 | 12篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 12篇 |
2015年 | 5篇 |
2014年 | 10篇 |
2013年 | 12篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 8篇 |
2007年 | 14篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有169条查询结果,搜索用时 0 毫秒
61.
62.
Two methods to assess vulnerability to climate change in the Mexican agricultural sector 总被引:1,自引:0,他引:1
Alejandro Monterroso Cecilia Conde Carlos Gay David Gómez José López 《Mitigation and Adaptation Strategies for Global Change》2014,19(4):445-461
We applied two methods to assess vulnerability to climate change in Mexico’s agricultural sector. The first one was a principal component analysis (PCA) that weighted each variable separately. For the second one, we integrated the variables in a linear array in which all variables were weighted equally, and then, we used the arithmetic sum of the sub-indices of exposure and sensitivity minus the adaptive capacity to obtain the vulnerability index. We discuss the similarities and differences between two methods with respect to municipal-level maps as the outputs. The application of the method for the agricultural sector in Mexico gave us the spatial distribution of the high- and very-high vulnerability categories, which we propose as a tool for policy. The methods agreed that the very-high vulnerability category is present in 39 municipalities. Also we found that 16 % of the total population in the country is located in high-exposure areas. In addition, 41 % lives in municipalities identified as highly-sensitive. In terms of adaptive capacity, 20 % of the population lives in 1273 municipalities with low-adaptive capacity. Finally, we discuss the need for information regarding vulnerability at the national level to guide policies aimed at reducing exposure and sensitivity and increasing adaptive capacity. 相似文献
63.
Gabriela M. Vélez-Rubio Andrés Estrades Alejandro Fallabrino Jesús Tomás 《Marine Biology》2013,160(11):2797-2811
We present the first study conducted in a wide spatio-temporal scale on marine turtles strandings (N = 1,107) over a 12-year period (1999–2010) in Uruguay. Five species were recorded Chelonia mydas (N = 643; 58.1 %), Caretta caretta (N = 329; 29.7 %), Dermochelys coriacea (N = 131; 11.8 %), Eretmochelys imbricata (N = 3; 0.3 %), and Lepidochelys olivacea (N = 1; 0.1 %). The first three species stranded throughout the Uruguayan coast, but differences in distribution patterns were detected among species. Although occurring year round, stranding records show a clear seasonal pattern with variation in monthly distribution among species, but with a peak of records in austral summer. Strandings provide indirect evidence of threats to marine turtles in Uruguayan and surrounding waters, particularly fisheries and marine debris. Our results demonstrate that Uruguayan coastal waters likely serve as a foraging or development area for at least three endangered marine turtle species in temperate waters. 相似文献
64.
Alvaro Galan Alejandro Orfila Gonzalo Simarro Ismael Hernández-Carrasco Cristobal Lopez 《Environmental Fluid Mechanics》2012,12(3):291-300
We study the horizontal surface mixing and the transport induced by waves in a coastal environment. A comparative study is addressed by computing the Lagrangian coherent structures, via Finite Size Lyapunov Exponents, that arise in two different numerical settings: with and without wave coupled to currents. In general, we observe that mixing is increased in the area due to waves. Besides, the methodology presented here is tested by deploying a set of eight Lagrangian drifters at different locations. This dynamical approach is shown as a valuable tool to extract information about transport, mixing and residence embedded in the Eulerian time dependent velocity fields obtained from numerical models. 相似文献
65.
Bettina Mahler Yanina Sarquis Adamson Alejandro G. Di Giacomo Viviana A. Confalonieri Juan C. Reboreda 《Behavioral ecology and sociobiology》2009,63(11):1603-1608
The screaming cowbird Molothrus rufoaxillaris has been long known as a host specialist brood parasite. However, in the past years, the utilization of two new hosts has
been documented. We examined the variation in mitochondrial control region sequences from screaming cowbird chicks found in
the nests of two hosts, the bay-winged cowbird (Agelaioides badius), which is its regular host, and the chopi blackbird (Gnorimopsar chopi), which is a new host, in Formosa Province, Argentina. If a group of females switched to this new host, we expected to find
an association between host use and haplotype frequency distribution, indicating the presence of host-specific female lineages,
whereas we expected no such association if the cowbird population incorporated this new host and females use both hosts simultaneously.
Haplotype frequency distributions differed between cowbird chicks from the nests of both hosts. This indicates that nest choice
by females of this brood parasite is not random and that they preferentially parasitize the nests of the same host species. 相似文献
66.
We assess the bioaccumulation of metals (Pb, Hg, Cd, Fe, Mg, Zn, Cu, Mn, Mo, Cr) and effects of landfill leachates on morphological (RI, relative weights), plasma (GPT, GOT, creatinine), and genotoxic (MNT) parameters in wood mice, Apodemus sylvaticus, inhabiting close the Garraf landfill site (NE Spain). Due to the high age- and sex-dependent variation in wild populations, we also studied the effect of these biotic factors on the parameters studied. Wood mice from the landfill site, sited in a partially protected area, showed more Cd, Fe, Zn, Cu, Mn, Mo, and Cr than specimens from the reference site. Moreover, mice near the landfill registered low RI and high relative renal weight, GPT, and MN frequency, which indicate that the landfill affects the health of wild mice. In contrast to sympatric shrews from a previous study, wood mice showed lower bioaccumulation of metals and lower variation caused by biotic factors. Moreover, the morphological and physiological alterations demonstrated that they were also more sensitive at environmental pollution. Given the contribution of small mammals to ecosystem function and the scarce ecotoxicological data on the effects of landfill pollution on wild terrestrial mammals, we consider that our study can be used to improve the management of this protected area. 相似文献
67.
Long-term effects of lead poisoning on bone mineralization in vultures exposed to ammunition sources
Gangoso L Alvarez-Lloret P Rodríguez-Navarro AA Mateo R Hiraldo F Donázar JA 《Environmental pollution (Barking, Essex : 1987)》2009,157(2):569-574
Long-lived species are particularly susceptible to bioaccumulation of lead in bone tissues. In this paper we gain insights into the sublethal effects of lead contamination on Egyptian vultures (Neophron percnopterus). Our approach was done on the comparison of two populations (Canary Islands and Iberian Peninsula) differing in exposures to the ingestion of lead ammunition. Blood lead levels were higher in the island population (Canary Islands range: 5.10-1780 μg L−1n = 137; Iberian Peninsula range: 5.60-217.30 μg L−1n = 32) showing clear seasonal trends, peaking during the hunting season. Moreover, males were more susceptible to lead accumulation than females. Bone lead concentration increased with age, reflecting a bioaccumulation effect. The bone composition was significatively altered by this contaminant: the mineralization degree decreased as lead concentration levels increased. These results demonstrate the existence of long-term effects of lead poisoning, which may be of importance in the declines of threatened populations of long-lived species exposed to this contaminant. 相似文献
68.
69.
Alejandro Trejo 《Natural resources forum》1990,14(1):76-77
FIDEICOMISO of non-metallic minerals is a trust development fund aimed at providing credit and technical assistance for the exploitation, beneficiation and downstream processing of non-metallics. FIDEICOMISO'S funding comes from, in order of importance, the World Bank, operational revenues and federal funds. It is a second tier financial institution operating through the commercial banking system, the latter providing the retail role. In 1987 and 1988 the FIDEICOMISO approved credits for $23 million and $46 million respectively. 相似文献
70.
de Castro Medeiros Luciana de Alencar Feliphe Lacerda Souza Navoni Julio Alejandro de Araujo André Luis Calado do Amaral Viviane Souza 《Environmental science and pollution research international》2019,26(6):5316-5332
Environmental Science and Pollution Research - Chlorine is considered the most used chemical agent for water disinfection worldwide. However, water chlorination can lead to by-product generation... 相似文献