全文获取类型
收费全文 | 571篇 |
免费 | 19篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 46篇 |
废物处理 | 29篇 |
环保管理 | 125篇 |
综合类 | 88篇 |
基础理论 | 151篇 |
污染及防治 | 98篇 |
评价与监测 | 31篇 |
社会与环境 | 19篇 |
灾害及防治 | 8篇 |
出版年
2023年 | 10篇 |
2022年 | 9篇 |
2021年 | 11篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 19篇 |
2016年 | 33篇 |
2015年 | 22篇 |
2014年 | 15篇 |
2013年 | 45篇 |
2012年 | 27篇 |
2011年 | 32篇 |
2010年 | 25篇 |
2009年 | 23篇 |
2008年 | 26篇 |
2007年 | 31篇 |
2006年 | 31篇 |
2005年 | 24篇 |
2004年 | 12篇 |
2003年 | 16篇 |
2002年 | 15篇 |
2001年 | 19篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 8篇 |
1997年 | 11篇 |
1996年 | 7篇 |
1995年 | 12篇 |
1994年 | 8篇 |
1993年 | 10篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1958年 | 1篇 |
1941年 | 1篇 |
排序方式: 共有595条查询结果,搜索用时 15 毫秒
591.
592.
Marcussen H Joergensen K Holm PE Brocca D Simmons RW Dalsgaard A 《Environmental monitoring and assessment》2008,139(1-3):77-91
Extensive aquatic or semi-aquatic production of water spinach (Ipomoea aquatica Forssk.) for human consumption takes place in Southeast Asia. The aim of this study was to assess the concentrations of 38
elements in soil and water spinach cultivated under different degrees of wastewater exposure in Hanoi, Vietnam. The results
showed no effect of wastewater use on the overall element concentrations in soil and water spinach. Mean soil concentrations
for selected potentially toxic elements at the studied field sites had the following ranges 9.11–18.7 As, 0.333–0.667 Cd,
10.8–14.5 Co, 68–122 Cr, 34.0–62.1 Cu, 29.9–52.8 Ni, 32.5–67.4 Pb, 0.578–0.765 Tl and 99–189 Zn mg kg−1 dry weight (d.w.). In all samples Cd, Pb and Zn soil concentrations were below the Vietnamese Guideline Values (TCVN 7209-2002)
for agricultural soils whereas As and Cu exceeded the guideline values. Maximum site element concentrations in water spinach
were 0.139 As, 0.032 Cd, 0.135 Cr, 2.01 Cu, 39.1 Fe, 57.3 Mn, 0.16 Ni, 0.189 Pb and 6.01 Zn mg kg−1 fresh weight (f.w.). The site and soil content of organic carbon were found to have high influence on the water spinach element
concentrations whereas soil pH and the total soil element concentrations were of less importance. The estimated average daily
intake of As, Cd, Cu, Fe, Pb and Zn for adult Vietnamese consumers amounts to <11% of the maximum tolerable intake proposed
by FAO/WHO for each element. It is assessed that the occurrence of the investigated elements in water spinach will pose low
health risk for the consumers. 相似文献
593.
Jane T. Bhaskar S. C. Tripathy P. Sabu C. M. Laluraj S. Rajan 《Environmental monitoring and assessment》2016,188(4):224
Phytoplankton species distribution and composition were determined by using microscopy and pigment ratios in the Kongsfjorden during early autumn 2012. Variation in sea surface temperature (SST) was minimal and matched well with satellite-derived SST. Nutrients were generally limited. Surface phytoplankton abundance ranged from 0.21?×?103 to 10.28?×?103 cells L?1. Phytoplankton abundance decreased with depth and did not show any significant correlation with chlorophyll a (chl a). Column-integrated phytoplankton cell counts (PCC) ranged from 94.3?×?106 cells m?2 (Kf4) to 13.7?×?106 cells m?2 (Kf5), while chl a was lowest at inner part of the fjord (6.3 mg m?2) and highest towards the mouth (24.83 mg m?2). Biomass from prymnesiophytes and raphidophytes dominated at surface and 10 m, respectively. The contribution of Bacillariophyceae to biomass was low. Generally, heterotrophic dinoflagellates were great in abundance (12.82 %) and ubiquitous in nature and were major contributors to biomass. Various chl pigments (chl b, chl c, phaeopigments (phaeo)) were measured to obtain pigment/chl a ratios to ascertain phytoplankton composition. Phaeo were observed only in inner fjord. Chl b:a ratios and microscopic observations indicated dominance of Chlorophyceae at greater depths than surface. Furthermore, microscopic observations confirmed dominance of chl c containing algae throughout the fjord. The study indicates that pigment ratios can be used as a tool for preliminary identification of major phytoplankton groups. However, under the presence of a large number of heterotrophic dinoflagellates such as Gymnodinium sp. and Gyrodinium sp., pigment signatures need to be supplemented by microscopic observations. 相似文献
594.
Lima Fernando Santos Scalize Paulo Sérgio Gabriel Ellen Flávia Moreira Gomes Raylane Pereira Gama Aline Rodrigues Demoliner Meriane Spilki Fernando Rosado Vieira José Daniel Gonçalves Carneiro Lilian Carla 《Food and environmental virology》2022,14(1):77-88
Food and Environmental Virology - Rural environments lack basic sanitation services. Facilities for obtaining water and disposing sewage are often under the initiative of each resident, who may not... 相似文献
595.
Thio Ellen Tan MeiXuen Li Liang Salman Muhammad Long Xingle Sun Huaping Zhu Bangzhu 《Environment, Development and Sustainability》2022,24(9):11226-11259
Environment, Development and Sustainability - Global climate change due to greenhouse gas emissions has observable impacts on environment. Among the GHG emissions, carbon dioxide is the primary... 相似文献