全文获取类型
收费全文 | 1570篇 |
免费 | 194篇 |
国内免费 | 549篇 |
专业分类
安全科学 | 161篇 |
废物处理 | 51篇 |
环保管理 | 122篇 |
综合类 | 1189篇 |
基础理论 | 236篇 |
污染及防治 | 308篇 |
评价与监测 | 105篇 |
社会与环境 | 88篇 |
灾害及防治 | 53篇 |
出版年
2024年 | 17篇 |
2023年 | 53篇 |
2022年 | 143篇 |
2021年 | 145篇 |
2020年 | 143篇 |
2019年 | 109篇 |
2018年 | 105篇 |
2017年 | 113篇 |
2016年 | 104篇 |
2015年 | 110篇 |
2014年 | 115篇 |
2013年 | 147篇 |
2012年 | 140篇 |
2011年 | 118篇 |
2010年 | 108篇 |
2009年 | 90篇 |
2008年 | 70篇 |
2007年 | 76篇 |
2006年 | 62篇 |
2005年 | 59篇 |
2004年 | 40篇 |
2003年 | 33篇 |
2002年 | 42篇 |
2001年 | 34篇 |
2000年 | 25篇 |
1999年 | 14篇 |
1998年 | 18篇 |
1997年 | 10篇 |
1996年 | 14篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有2313条查询结果,搜索用时 15 毫秒
211.
Caiyun Hou Sen Qiao Yue Yang Jiti Zhou 《Frontiers of Environmental Science & Engineering》2019,13(6):92
212.
213.
Liu Jingkuang Teng Yue Wang Dong Gong Enqin 《Environmental science and pollution research international》2020,27(30):37260-37277
Environmental Science and Pollution Research - With the acceleration of China’s urbanization process, construction activities have led to a substantial increase in construction waste.... 相似文献
214.
Juan Carlos Moreno Saiz Felipe Domínguez Lozano Manuel Marrero Gómez Ángel Bañares Baudet 《Conservation biology》2015,29(3):910-919
The International Union for Conservation of Nature (IUCN) Red List Index (RLI) is used to measure trends in extinction risk of species over time. The development of 2 red lists for Spanish vascular flora during the past decade allowed us to apply the IUCN RLI to vascular plants in an area belonging to a global biodiversity hotspot. We used the Spanish Red Lists from 2000 and 2010 to assess changes in level of threat at a national scale and at the subnational scales of Canary Islands, Balearic Islands, and peninsular Spain. We assigned retrospective IUCN categories of threat to 98 species included in the Spanish Red List of 2010 but absent in the Spanish Red List of 2000. In addition, we tested the effect of different random and taxonomic and spatial Spanish samples on the overall RLI value. From 2000 to 2010, the IUCN categories of 768 species changed (10% of Spanish flora), mainly due to improved knowledge (63%), modifications in IUCN criteria (14%), and changes in threat status (12%). All measured national and subnational RLI values decreased during this period, indicating a general decline in the conservation status of the Spanish vascular flora. The Canarian RLI value (0.84) was the lowest, although the fastest deterioration in conservation status occurred on peninsular Spain (from 0.93 in 2000 to 0.92 in 2010). The RLI values based on subsamples of the Spanish Red List were not representative of RLI values for the entire country, which would discourage the use of small areas or small taxonomic samples to assess general trends in the endangerment of national biotas. The role of the RLI in monitoring of changes in biodiversity at the global and regional scales needs further reassessment because additional areas and taxa are necessary to determine whether the index is sufficiently sensitive for use in assessing temporal changes in species’ risk of extinction. 相似文献
215.
聚合氯化铝铁絮凝剂的性能研究 总被引:32,自引:2,他引:32
煤矸石是采煤过程之废料。本文利用煤矸石制备出了聚合氯化铝铁(PAFC):一种新型无机高分子絮凝剂,探讨了Fe^3+的稳定性与溶液离子强度之间的关系,发现溶液的离子强度越大,则产生Fe(OH)3沉淀时的PH越高。研究了PAFC水解产物的ζ电位及絮凝效果随PH的变化情况,比较了PAFC、PAC和PFS的除浊性能,PAFC在PH为7.0-8.2范围内除浊效果最佳,PAFC的除浊效果优于PAC。 相似文献
216.
217.
Scenarios of major terrestrial ecosystems in China 总被引:2,自引:0,他引:2
The spatial pattern and mean-center shift of major terrestrial ecosystems, termed Holdridge Life Zones (HLZ), during the periods from 1961 to 1990 (T1), from 2010 to 2039 (T2), from 2040 to 2069 (T3) and from 2070 to 2099 (T4) were analyzed by combining the zonal patterns of climatic change in China and the climatic change scenarios of HadCM2 and HadCM3. The results showed that nival area would decrease rapidly with temperature increase in the future. HadCM2 and HadCM3 predicted that the nival areas might disappear in 552 years and 204 years, respectively. Using both HadCM2 and HadCM3, the five HLZ types with the largest areal extent are nival zone, cool temperate moist forest, warm temperate moist forest, subtropical moist forest and boreal wet forest, which collectively account for more than 50% of China's land mass. Among these five HLZ types, nival zone, warm temperate moist forest and boreal wet forest would decrease continuously, whereas subtropical moist forest and cool temperate forest would increase continuously during the four periods. HLZ diversity and patch connectivity would increase continuously in the 21st century. The shift distances of mean centers of HLZ types simulated using HadCM3 were markedly greater than those simulated using HadCM2, in general. The results from both HadCM2 and HadCM3 showed that boreal wet forest, subtropical moist forest, tropical dry forest, warm temperate moist forest and subtropical wet forest had bigger shift ranges, indicating that these HLZ types are more sensitive to the climatic change scenarios of HadCM2 and HadCM3. 相似文献
218.
向海湿地河道上下游土壤重金属污染程度分析 总被引:3,自引:0,他引:3
以向海湿地河道上、下游土壤沉积物为研究对象,以Al元素作为标准化元素,通过对重金属元素富集因子的分析,研究了Cu、Ni、Mn、Fe、Ba、Cr等6种重金属元素的人为污染状况及分级。结果表明,该区土壤沉积物中重金属元素均受到不同程度的人为污染影响,部分层面Ni、Ba等重金属元素污染程度达到显著水平,造成这种现象的主要原因是富含重金属的霍林河上游矿源物质的沉积及人类对湿地开发活动的历史变迁过程;此外,径流淹没频率不同造成了两断面土壤沉积类型和沉积效果的不同,使得受水文影响较大的上游断面的人为污染程度大于受影响较小的下游断面,说明向海湿地对人为污染具有一定的缓冲能力,或向海湿地具有较强的净化和过滤功能。 相似文献
219.
以金沙江中下游一级支流龙川江为例,通过探讨河流地面反射光谱与河流悬沙质量浓度的关系,初步开发了河流悬沙质量浓度的地面遥感预测技术。研究发现,基于R800/R550的经验模型,仅能够预测浓度范围在400g.m^-3以下的悬沙质量浓度值,对于较低悬沙质量浓度的河流或其他水域有较大运用价值。光学拟合技术能够预测龙川江在其整个变化范围的河流悬沙质量浓度,最高预测浓度可以达到13000g.m^-3。通过直接运用两种方法,或者进一步将它们提升成为卫星遥感运用技术后,对于中国西南众多的江河湖库有着重要的理论和现实意义。 相似文献
220.
广东省水资源问题及可持续利用对策 总被引:7,自引:3,他引:7
论述了广东省的水资源状况和水资源利用中存在的主要问题,提出了水资源可持续利用的对策。认为水质性缺水、水利工程老化失修、水资源浪费严重、管理体制不健全是水资源利用中存在的主要问题;应加强水污染的防治,健全防洪防旱体系,建立健全水资源统一管理运作饥制,提高全民节水观念,发展节水农业,走兴林治水之路,使水资源可持续利用。 相似文献