全文获取类型
收费全文 | 2613篇 |
免费 | 67篇 |
国内免费 | 28篇 |
专业分类
安全科学 | 144篇 |
废物处理 | 103篇 |
环保管理 | 533篇 |
综合类 | 258篇 |
基础理论 | 700篇 |
环境理论 | 5篇 |
污染及防治 | 640篇 |
评价与监测 | 190篇 |
社会与环境 | 103篇 |
灾害及防治 | 32篇 |
出版年
2023年 | 22篇 |
2022年 | 40篇 |
2021年 | 54篇 |
2020年 | 32篇 |
2019年 | 55篇 |
2018年 | 64篇 |
2017年 | 81篇 |
2016年 | 95篇 |
2015年 | 61篇 |
2014年 | 80篇 |
2013年 | 193篇 |
2012年 | 127篇 |
2011年 | 168篇 |
2010年 | 113篇 |
2009年 | 139篇 |
2008年 | 152篇 |
2007年 | 142篇 |
2006年 | 140篇 |
2005年 | 94篇 |
2004年 | 92篇 |
2003年 | 77篇 |
2002年 | 75篇 |
2001年 | 53篇 |
2000年 | 69篇 |
1999年 | 48篇 |
1998年 | 30篇 |
1997年 | 15篇 |
1996年 | 32篇 |
1995年 | 28篇 |
1994年 | 38篇 |
1993年 | 23篇 |
1992年 | 19篇 |
1991年 | 16篇 |
1990年 | 20篇 |
1989年 | 22篇 |
1988年 | 16篇 |
1987年 | 17篇 |
1986年 | 13篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 19篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 12篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1969年 | 5篇 |
排序方式: 共有2708条查询结果,搜索用时 15 毫秒
991.
Ozone and atmospheric nitrogen are co-occurring pollutants with adverse effects on natural grassland vegetation. Plants of the rhizomatous sedge Carex arenaria were exposed to four ozone regimes representing increasing background concentrations (background-peak): 10-30, 35-55, 60-80 and 85-105 ppb ozone at two nitrogen levels: 12 and 100 kg N ha−1 yr−1. Ozone increased the number and proportion of senesced leaves, but not overall leaf number. There was a clear nitrogen × ozone interaction with high nitrogen reducing proportional senescence in each treatment and increasing the ozone dose (AOT40) at which enhanced senescence occurred. Ozone reduced total biomass due to significant effects on root biomass. There were no interactive effects on shoot:root ratio. Rhizome tissue N content was increased by both nitrogen and ozone. Results suggest that nitrogen mediates above-ground impacts of ozone but not impacts on below-ground resource translocation. This may lead to complex interactive effects between the two pollutants on natural vegetation. 相似文献
992.
Hung Nguyen Viet Marina Vladimirovna Frontasyeva Thu My Trinh Thi Daniel Gilbert Nadine Bernard 《Environmental science and pollution research international》2010,17(5):1045-1052
Background, aim, and scope
The moss technique is widely used to monitor atmospheric deposition of heavy metals in many countries in Europe, whereas this technique is scarcely used in Asia. To implement this international reliable and cheap methodology in the Asian countries, it is necessary to find proper moss types typical for the Asian environment and suitable for the biomonitoring purposes. Such a case study was undertaken in Vietnam for assessing the environmental situation in strongly contaminated areas using local species of moss Barbula indica. 相似文献993.
J.-P. Putaud R. Van Dingenen A. Alastuey H. Bauer W. Birmili J. Cyrys H. Flentje S. Fuzzi R. Gehrig H.C. Hansson R.M. Harrison H. Herrmann R. Hitzenberger C. Hüglin A.M. Jones A. Kasper-Giebl G. Kiss A. Kousa T.A.J. Kuhlbusch G. Löschau F. Raes 《Atmospheric environment (Oxford, England : 1994)》2010,44(10):1308-1320
This paper synthesizes data on aerosol (particulate matter, PM) physical and chemical characteristics, which were obtained over the past decade in aerosol research and monitoring activities at more than 60 natural background, rural, near-city, urban, and kerbside sites across Europe. The data include simultaneously measured PM10 and/or PM2.5 mass on the one hand, and aerosol particle number concentrations or PM chemistry on the other hand. The aerosol data presented in our previous works (Van Dingenen et al., 2004, Putaud et al., 2004) were updated and merged to those collected in the framework of the EU supported European Cooperation in the field of Scientific and Technical action COST633 (Particulate matter: Properties related to health effects). A number of conclusions from our previous studies were confirmed. There is no single ratio between PM2.5 and PM10 mass concentrations valid for all sites, although fairly constant ratios ranging from 0.5 to 0.9 are observed at most individual sites. There is no general correlation between PM mass and particle number concentrations, although particle number concentrations increase with PM2.5 levels at most sites. The main constituents of both PM10 and PM2.5 are generally organic matter, sulfate and nitrate. Mineral dust can also be a major constituent of PM10 at kerbside sites and in Southern Europe. There is a clear decreasing gradient in SO42? and NO3? contribution to PM10 when moving from rural to urban to kerbside sites. In contrast, the total carbon/PM10 ratio increases from rural to kerbside sites. Some new conclusions were also drawn from this work: the ratio between ultrafine particle and total particle number concentration decreases with PM2.5 concentration at all sites but one, and significant gradients in PM chemistry are observed when moving from Northwestern, to Southern to Central Europe. Compiling an even larger number of data sets would have further increased the significance of our conclusions, but collecting all the aerosol data sets obtained also through research projects remains a tedious task. 相似文献
994.
995.
Mae A. Davenport Christopher A. Bridges Jean C. Mangun Andrew D. Carver Karl W. J. Williard Elizabeth O. Jones 《Environmental management》2010,45(4):711-722
Natural resource professionals are increasingly faced with the challenges of cultivating community-based support for wetland
ecosystem restoration. While extensive research efforts have been directed toward understanding the biophysical dimensions
of wetland conservation, the literature provides less guidance on how to successfully integrate community stakeholders into
restoration planning. Therefore, this study explores the social construction of wetlands locally, and community members’ perceptions
of the wetland restoration project in the Cache River Watershed of southern Illinois, where public and private agencies have
partnered together to implement a large-scale wetlands restoration project. Findings illustrate that the wetlands hold diverse
and significant meanings to community members and that community members’ criteria for project success may vary from those
identified by project managers. The case study provides managers with strategies for building community commitment such as
engaging local citizens in project planning, minimizing local burdens, maximizing local benefits, and reducing uncertainty. 相似文献
996.
Effect of amendment of bauxite processing sand with organic materials on its chemical,physical and microbial properties 总被引:1,自引:0,他引:1
The effects of addition of a range of organic amendments (biosolids, spent mushroom compost, green waste compost and green waste-derived biochar), at two rates, on some key chemical, physical and microbial properties of bauxite-processing residue sand were studied in a laboratory incubation study. Levels of exchangeable cations were not greatly affected by additions of amendments but extractable P was increased significantly by mushroom and green waste composts and massively (i.e. from 11.8 to 966 mg P kg?1) by biosolids applications. Levels of extractable NO3?–N were also greatly elevated by biosolids additions and there was a concomitant decrease in pH. Addition of all amendments decreased bulk density and increased mesoporosity, available water holding capacity and water retention at field capacity (?10 kPa), with the higher rate having a greater effect. Addition of biosolids, mushroom compost and green waste compost all increased soluble organic C, microbial biomass C, basal respiration and the activities of β-glucosidase, L-asparaginase and alkali phosphatase enzymes. The germination index of watercress grown in the materials was greatly reduced by biosolids application and this was attributed to the combined effects of a high EC and high concentrations of extractable P and NO3?. It was concluded that the increases in water storage and retention and microbial activity induced by additions of the composts is likely to improve the properties of bauxite-processing residue sand as a growth medium but that allowing time for soluble salts, originating from the organic amendments, to leach out may be an important consideration before sowing seeds. 相似文献
997.
Influences of Spatial Scale and Soil Permeability on Relationships Between Land Cover and Baseflow Stream Nutrient Concentrations 总被引:1,自引:0,他引:1
F. Bernard Daniel Michael B. Griffith Michael E. Troyer 《Environmental management》2010,45(2):336-350
The Little Miami River (LMR) basin, dominated by agriculture, contains two geologically-distinct regions; a glaciated northern
till plain with soils three times more permeable than a southern, pre-Wisconsinan drift plain. The influences of two landscape
measures, percent row crop cover (%RCC, computed at three spatial scales), and soil permeability (PERM), on baseflow nutrient
concentrations were modeled using linear regressions. Quarterly water samples collected for four years were analyzed for nitrate-N
(NN), Kjeldahl-N (KN), total-N (TN), and total-P (TP). In till plain streams (n = 17), NN concentrations were 8.5-times greater than drift plain streams (n = 18), but KN and TP were 20–40% lower at comparable %RCC. These differences resulted in TN/TP molar ratios >80 in till plain
streams, but <6 in drift plain streams. For till plain steams regression models based on %RCC accounted for 79% of the variance
in NN concentrations but only 27% in drift plain streams. However, regressions on %RCC accounted for 68–75% of the KN and
TP concentration variance in the drift plain streams but essentially none in the till plain. Catchment PERM influenced the
regional NN/KN ratios which were 10-fold higher in the drift plain streams. For both till and drift streams the catchment
scale %RCC gave the best predictions of NN, a water soluble anion, but the smaller spatial scales produced better models for
insoluble nutrient species (e.g., KN and TP). Published literature on Ohio streams indicates that these inter-regional differences
in nutrient ratios have potential implications for aquatic biota in the receiving streams. 相似文献
998.
Christopher Kuzdas Benjamin P. Warner Arnim Wiek Raffaele Vignola Mariel Yglesias Daniel L. Childers 《Sustainability Science》2016,11(2):231-247
Many new forms of water governance are emerging in response to economic and social needs and wants, as well as water-related problems such as scarcity, injustice, and conflict. However, there is little evidence on how sustainable these governance regimes are, which would be critical for making progress toward sustainable and just water governance. In this article, we present the results of a transdisciplinary multi-criteria sustainability assessment of alternative governance regimes for Guanacaste Province, Costa Rica. The assessment specifies differences between sustainable and unsustainable governance regimes, while also pinpointing how the current water governance regime performs in comparison to those alternatives. The findings indicate that those governance regimes with just and deliberative stakeholder involvement, secure groundwater reserves, and healthy dry tropical ecosystems were considered sustainable and just. In contrast, the current state of water governance was found to be at high risk of digressing toward unsustainable systems where rural communities lack rights and influence, where economies favor agro-industry and high impact tourism at the expense of rural livelihoods, and where water scarcity overwhelms weak governance. This assessment study clarifies water sustainability goals, asserts the need for transformational change, and offers a pragmatic foundation for actions toward sustainable water governance. 相似文献
999.
Jones BE Haynes RJ Phillips IR 《Environmental science and pollution research international》2012,19(3):835-846
Purpose
To examine (1) the effect of organic (poultry manure) and inorganic (residue mud and phosphogypsum) amendments on nutrient leaching losses from residue sand and (2) whether amendments improve the growth of plants in residue sand. 相似文献1000.