全文获取类型
收费全文 | 8364篇 |
免费 | 709篇 |
国内免费 | 3714篇 |
专业分类
安全科学 | 347篇 |
废物处理 | 277篇 |
环保管理 | 1434篇 |
综合类 | 6099篇 |
基础理论 | 2552篇 |
污染及防治 | 1123篇 |
评价与监测 | 433篇 |
社会与环境 | 334篇 |
灾害及防治 | 188篇 |
出版年
2024年 | 66篇 |
2023年 | 222篇 |
2022年 | 332篇 |
2021年 | 349篇 |
2020年 | 344篇 |
2019年 | 375篇 |
2018年 | 363篇 |
2017年 | 403篇 |
2016年 | 495篇 |
2015年 | 459篇 |
2014年 | 526篇 |
2013年 | 819篇 |
2012年 | 649篇 |
2011年 | 679篇 |
2010年 | 541篇 |
2009年 | 512篇 |
2008年 | 476篇 |
2007年 | 515篇 |
2006年 | 516篇 |
2005年 | 407篇 |
2004年 | 368篇 |
2003年 | 388篇 |
2002年 | 419篇 |
2001年 | 383篇 |
2000年 | 398篇 |
1999年 | 289篇 |
1998年 | 211篇 |
1997年 | 197篇 |
1996年 | 323篇 |
1995年 | 171篇 |
1994年 | 95篇 |
1993年 | 79篇 |
1992年 | 51篇 |
1991年 | 57篇 |
1990年 | 46篇 |
1989年 | 40篇 |
1988年 | 19篇 |
1987年 | 18篇 |
1986年 | 10篇 |
1985年 | 25篇 |
1984年 | 43篇 |
1983年 | 41篇 |
1982年 | 9篇 |
1981年 | 7篇 |
1980年 | 13篇 |
1979年 | 5篇 |
1978年 | 9篇 |
1975年 | 2篇 |
1972年 | 2篇 |
1971年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
971.
Sesbania rostrata in pure and amended Pb/Zn tailings. About 90% of seeds of S. rostrata germinated in pure Pb/Zn tailings, which contained high concentrations of Pb, Zn, Cu, and Cd. Although seedling growth suffered
from the adverse environment of Pb/Zn tailings, they became established on tailings stands, in the greenhouse, as well as
on the actual tailings dam, and completed their life cycle in 4 months. Dry matter production and nitrogen accumulation was
3200 kg/ha and 69.4 kg/ha, respectively in the actual tailings dam. Applying inorganic fertilizer to Pb/Zn tailings led to
no obvious improvement in growth and nodulation of S. rostrata, while tailings amended by river sediment or domestic refuse rich in organic matter improved the growth and nodulation of
the species. Azorhizobium caulinodans survived and formed N-fixing stem and root nodules in S. rostrata grown in pure Pb/Zn tailings with a nodule biomass exceeding 300 mg fresh matter per plant. 相似文献
972.
DAVID P. LAWRENCE 《Environmental management》1997,21(1):23-42
/ Environmental impact assessment (EIA) has been identified as an important instrument for facilitating sustainability. However, to do so requires the integration of sustainability into EIA theory and practice. The sustainability concept is a valid and important environmental management perspective. However, many issues and obstacles need to be addressed further if the concept is to be translated into practical strategies. Sustainability can potentially infuse EIA with a clearer sense of direction, an ethical foundation, a mechanism for establishing priorities and assessing choices, and a means of linking EIA to other environmental management instruments. Conceptually, EIA and sustainability can be integrated, but frameworks should be refined, adpated to context, and linked to related initiatives. Sustainability should be explicitly incorporated into EIA legislation, guidelines, and institutional arrangements. An experimental approach to testing, assessing, and sharing experiences is suggested.A framework is first presented that defines and characterizes the sustainability concept. A further framework is then described for integrating sustainability into EIA at the conceptual level. The integration of sustainability and EIA at the regulatory level is next addressed through an overview of sustainability initiatives in EIA requirements in Canada. The Canadian examples include many promising initiatives but these and other experiences will need to be monitored, shared, and integrated into comprehensive environmental management strategies. Finally, means of incorporating sustainability into each activity in the EIA planning process are identified.KEY WORDS: Sustainability; Environmental impact assessment 相似文献
973.
长江中游不同潜育化土壤诊断指标探讨 总被引:4,自引:0,他引:4
潘淑贞 《长江流域资源与环境》1997,6(2):155-162
田间原位测定,室内分析和模拟试验的结果表明,长江中游垸田土壤潜育化过程中发生一系列物质变化,其中以活性还原物质量,Al2(SO4)3溶液提取的亚铁量和氧化还原电位三者变化最为显著。活性还原物质量和亚铁量与潜育化作用强度正相关,而氧化还原电位则呈负相关。 相似文献
974.
Sang-Woo Lee Ju-Yong Kim Jong-Un Lee IlWon Ko Kyoung-Woong Kim 《Environmental geochemistry and health》2004,26(3-4):403-409
In order to investigate the optimum conditions for the application of soil flushing of arsenic, a batch test was carried out using EDTA at various concentration and pH levels. Based on the optimum condition derived from the batch test, a column test was conducted to examine the feasibility of the soil-flushing technology under field-equivalent conditions. In this column test, a low flushing solution flow rate showed a significantly higher As removal efficiency (71.6%) than a high flow rate (56.3%). TCLP (toxicity characteristic leaching procedure) and a seed germination test were carried out to monitor the toxicity both during and after the treatment. The finally treated tailings were shown to be significantly remediated, having a reduced toxicity by both the TCLP and seed germination tests. 相似文献
975.
以由地洛试剂为氧化剂,用分光光度法测定染料废水中对氨基酚的含量,进行了波长,贝特洛试剂用量及显色时间等分析条件的选择。精密度和准确度实验结果表明,该准确,快速,可用于染料废水中对氨基酚的测定。 相似文献
976.
Liette Vasseur Lise Lafrance Colette Ansseau Dominique Renaud Daniel Morin Thérèse Audet 《Environmental management》1997,21(3):359-365
/ It has been suggested that the general public should be moreinvolved in environmental policy and decision making. It is important forthem to realize that they will have to live with the consequences ofenvironmental policies and decisions. Consequently, policy makers shouldconsider the concerns and opinions of the general public before makingdecisions on environmental issues. This raises questions such as: How can weintegrate the perceptions and reactions of the general population inenvironmental decisions? What kind of public participation should weconsider? In the present study, using a new regional ecosystem model, weattempted to integrate these aspects in its decision making model byincluding the formation of an advisory committee to resolve problems relatedto waste management. The advisory committee requested the activeparticipation of representatives from all levels of the community: economic,municipal, and governmental intervenors; environmental groups; and citizens.Their mandates were to examine different management strategies available inthe region, considering all the interdisciplinary aspects of each strategy,elaborate recommendations concerning the management strategies that are mostsuitable for all, and collaborate in communication of the information to thegeneral population. The results showed that at least in small municipalitiessuch an advisory committee can be a powerful tool in environmental decisionmaking. Conditions required for a successful consultation process, such aseveryday lay language and the presence of a facilitator other than ascientific expert, are discussed.KEY WORDS: Public consultation; Environmental policies;Interdisciplinary aspects; Municipal sewage sludge management; Generalpopulation; Decision-making process 相似文献
977.
低山丘陵区水土保持治理与生态环境效应 总被引:4,自引:0,他引:4
陈良 《长江流域资源与环境》2004,13(4):370-374
分析了低山丘陵区水土流失等级分布,水土流失的形成原因及危害,指出低山丘陵区水土流失综合治理要以小流域综合治理为主,阐明小流域水土流失的规律性,以及根据小流域3个地貌单元类型按“三条带”模式进行综合治理:山顶林草防治、山腰经济林带整治、山脚坡改梯治理的技术措施,着重论述综合治理的生态环境效应:明显地保水保土保肥,在降雨量相同的情况下等高种植、坡改梯、封山育林雨强明显小于坡耕地,起始产流时间延迟,径流量减少近2/3,土壤侵蚀量明显比坡耕地少得多。土壤侵蚀携带养分,坡耕地损失量最大,等高种植全氮、全磷的损失量最小;坡改梯有机质、有效氮、速效钾流失量较少,说明坡改梯的保肥效果优于等高种植。林草植被对改善生态系统的环境效应和提高生物多样性功能,为低山丘陵区生态环境恢复和农业可持发展奠定基础。 相似文献
978.
徐琪 《长江流域资源与环境》2002,(4)
太湖地区是我国古老农业区之一。在六七千年之前先民已开始种植水稻 ,随着耕作培肥措施不断加强 ,与土壤肥力进化同步伴随着耕作轮作制的不断演进 ,由轮荒———沤田———水旱轮作———三熟制的变化 ,土壤基础肥力稳步提高 ,稻麦单位面积产量逐年上升。该区水稻土历经数千年的耕肥与平田整地等人为活动 ,在起源土壤背景上发育成五类水稻土 ,这五类水稻土经过培肥改良均达到水旱轮作高产稳产阶段 ,尽管地力上还存在不同程度的差异 ,这不能不说是人为定向培育的成果。在一般情况下 ,土壤质量是由土壤肥力决定的 ,基础肥力高低是农业生产优质高产低耗的关键 ,在评价土壤质量时必需首先予以关注。当然 ,随着工业的发展 ,土壤污染所波及的农产品超标问题 ,也应在评价土壤质量时予以关注 ,并作为评价因素在综合评价体系中占有应有的份量 相似文献
979.
980.
E. G. Plotnikova D. O. Rybkina L. N. Anan’ina O. V. Yastrebova V. A. Demakov 《Russian Journal of Ecology》2006,37(4):233-240
Microorganisms capable of degrading monocyclic and polycyclic aromatic hydrocarbons and several chlorinated aromatic compounds were isolated from soils polluted with industrial waste from chemical plants. They were identified as representatives of the genera Pseudomonas, Flavobacterium, Alcaligenes, Rhodococcus, Microbacterium, Cellulomonas, Arthrobacter, and Brevibacterium. Among them, bacteria capable of utilizing xenobiotics in a wide range of ambient temperatures and pH and in the presence of high sodium chloride concentrations were revealed. 相似文献