全文获取类型
收费全文 | 655篇 |
免费 | 34篇 |
国内免费 | 275篇 |
专业分类
安全科学 | 33篇 |
废物处理 | 48篇 |
环保管理 | 51篇 |
综合类 | 394篇 |
基础理论 | 128篇 |
环境理论 | 1篇 |
污染及防治 | 212篇 |
评价与监测 | 33篇 |
社会与环境 | 35篇 |
灾害及防治 | 29篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 36篇 |
2021年 | 29篇 |
2020年 | 15篇 |
2019年 | 25篇 |
2018年 | 26篇 |
2017年 | 29篇 |
2016年 | 34篇 |
2015年 | 26篇 |
2014年 | 49篇 |
2013年 | 59篇 |
2012年 | 48篇 |
2011年 | 50篇 |
2010年 | 41篇 |
2009年 | 40篇 |
2008年 | 48篇 |
2007年 | 38篇 |
2006年 | 48篇 |
2005年 | 29篇 |
2004年 | 22篇 |
2003年 | 33篇 |
2002年 | 41篇 |
2001年 | 19篇 |
2000年 | 31篇 |
1999年 | 27篇 |
1998年 | 18篇 |
1997年 | 20篇 |
1996年 | 17篇 |
1995年 | 11篇 |
1994年 | 14篇 |
1993年 | 7篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有964条查询结果,搜索用时 125 毫秒
431.
Hua Fang Yu L. Han Yuan M. Yin Xiang X. Jin Shao Y. Wang Fei F. Tang 《Journal of environmental science and health. Part. B》2013,48(8):609-615
Substantive addition of antibiotic-contaminated manure to agricultural soil may lead to “persistent” residues of antibiotics and may affect soil health. Therefore, this study examines the effects of repeated manure treatments containing sulfadiazine (SDZ) and chlortetracycline (CTC) residues, both individually and combined, on the functional diversity and structure of soil microbial communities in the soils under laboratory conditions. The average well color development (AWCD), Simpson diversity index (1/D, dominant populations), Shannon-Wiener diversity index (H′, richness), and McIntosh diversity index (U, evenness) in the antibiotics-treated soils decreased in the first 60-day treatment and then gradually recovered or even exceeded the initial level in the unamended soils with increasing treatment frequency. A total of 11 specific bands in temperature gradient gel electrophoresis (TGGE) profiles were observed and sequence analyzed for five repeated treatments, and most of them belonged to the phyla Firmicutes, Actinobacteria, and Proteobacteria. These results indicate that repeated treatments of manure containing SDZ and CTC residues can alter soil microbial community structure, although they have a temporary suppression effect on soil microbial functional diversity. 相似文献
432.
Liu Shao 《中国人口.资源与环境(英文版)》2013,11(4):17-24
Abstract Sand-dust storms are the result of the integrated influences of climate, geography, society and human factors. A theoretical framework is built to explain the coherence of population growth, agriculture change and environmental degradation. On the basis of the analysis of the causes of the sand-dust storm in terms of human factors, a discussion will be given to show that these factors are internally consistent with the theoretical framework. After that, it will look at China's Agenda 21 and try to find relevant measures to reduce such large sand-dust storms happening in Northwest China and eventually make this area develop sustainably. 相似文献
433.
Xinchuang Wang Guofan Shao Hua Chen Bernard J. Lewis Guang Qi Dapao Yu Li Zhou Limin Dai 《Environmental management》2013,52(3):612-620
Monitoring the dynamics of forest biomass at various spatial scales is important for better understanding the terrestrial carbon cycle as well as improving the effectiveness of forest policies and forest management activities. In this article, field data and Landsat image data acquired in 1999 and 2007 were utilized to quantify spatiotemporal changes of forest biomass for Dongsheng Forestry Farm in Changbai Mountain region of northeastern China. We found that Landsat TM band 4 and Difference Vegetation Index with a 3 × 3 window size were the best predictors associated with forest biomass estimations in the study area. The inverse regression model with Landsat TM band 4 predictor was found to be the best model. The total forest biomass in the study area decreased slightly from 2.77 × 106 Mg in 1999 to 2.73 × 106 Mg in 2007, which agreed closely with field-based model estimates. The area of forested land increased from 17.9 × 103 ha in 1999 to 18.1 × 103 ha in 2007. The stabilization of forest biomass and the slight increase of forested land occurred in the period following implementations of national forest policies in China in 1999. The pattern of changes in both forest biomass and biomass density was altered due to different management regimes adopted in light of those policies. This study reveals the usefulness of the remote sensing-based approach for detecting and monitoring quantitative changes in forest biomass at a landscape scale. 相似文献
434.
435.
土壤水分管理对甲烷和氧化亚氮排放的影响 总被引:5,自引:0,他引:5
为控制农田温室气体排放的途径提供依据,通过实验室培养的方法测定了不同水分管理条件下CH4和N2O的排放,干旱处理(60%-70%WFP)和长期淹水土样在施肥后的Eh变化。最终得出:稻田CH4和N2O排放之间存在着互为消长的关系(R2=0.609),CH4和N2O的排放是水肥共同作用的结果,水分管理通过Eh来影响气体排放,有机质是造成前后期排放浓度差异的主要原因。 相似文献
436.
Environmental Geochemistry and Health - Although existing literature has explored the effect of the emission trading system (ETS) on economic growth and pollution emissions, little is known about... 相似文献
437.
Li Ziyue Chen Yongliang Meng Fanlei Shao Qi Heal Mathew R. Ren Fengling Tang Aohan Wu Jiechen Liu Xuejun Cui Zhenling Xu Wen 《Environmental science and pollution research international》2022,29(38):57190-57203
Environmental Science and Pollution Research - While intensive peach production has expanded rapidly in recent years, few studies have explored the environmental impacts associated with specific... 相似文献
438.
采用溶胶-凝胶法制备了磷钨酸(HPW)改性TiO_2,并固载于膨润土上,再经机械力化学活化,得到机械力化学活化HPW-TiO_2/膨润土(MCA-HPW-TiO_2/膨润土)复合光催化剂。采用XRD,SEM,EDS技术对复合光催化剂进行了表征,并将其用于甲基橙的紫外光催化降解。表征结果显示:活性组分TiO_2和HPW成功固载于膨润土上;在机械力化学活化作用下,膨润土层间结构遭到破坏,TiO_2的XRD特征峰形呈弥散状态。实验结果表明:机械力化学活化作用对HPW-TiO_2/膨润土的光催化性能提升效果显著;在酸性及近中性条件下MCA-HPWTiO_2/膨润土均具有较高的催化活性;在溶液p H 6.2、初始甲基橙质量浓度10 mg/L、反应时间180 min、MCAHPW-TiO_2/膨润土投加量1 g/L的条件下,甲基橙去除率达88.27%;该光催化降解过程符合一级动力学模型。 相似文献
439.
An exploration of the relationship between adsorption and bioavailability of pesticides in soil to earthworm 总被引:1,自引:0,他引:1
Yu YL Wu XM Li SN Fang H Zhan HY Yu JQ 《Environmental pollution (Barking, Essex : 1987)》2006,141(3):428-433
A study was conducted to determine the adsorption/desorption of butachlor, myclobutanil and chlorpyrifos on five soils using a batch equilibration technique and to study the relationship between bioavailability to Allolobophora caliginosa and the adsorption/desorption of these three pesticides. The results showed that the adsorption/desorption processes of the tested compounds were mainly controlled by soil organic matter content (OM) and octanol/water-partitioning coefficient (K(ow)), and that the bioavailability of the pesticides was dependent on characteristics of pesticides, properties of soils, and uptake routes of earthworms. Bioconcentration of butachlor and myclobutanil was negatively correlated with Freundlich adsorption constant K(af) and K(df). However, only a slightly positive correlation between bioconcentration and K(af) and K(df) was observed for chlorpyrifos due to its high affinity onto soil. 相似文献