全文获取类型
收费全文 | 328篇 |
免费 | 25篇 |
国内免费 | 127篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 26篇 |
环保管理 | 20篇 |
综合类 | 193篇 |
基础理论 | 41篇 |
环境理论 | 1篇 |
污染及防治 | 128篇 |
评价与监测 | 14篇 |
社会与环境 | 13篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 11篇 |
2022年 | 31篇 |
2021年 | 28篇 |
2020年 | 13篇 |
2019年 | 15篇 |
2018年 | 13篇 |
2017年 | 26篇 |
2016年 | 16篇 |
2015年 | 20篇 |
2014年 | 29篇 |
2013年 | 34篇 |
2012年 | 22篇 |
2011年 | 30篇 |
2010年 | 22篇 |
2009年 | 17篇 |
2008年 | 11篇 |
2007年 | 17篇 |
2006年 | 26篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2003年 | 10篇 |
2002年 | 5篇 |
2001年 | 7篇 |
2000年 | 11篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 11篇 |
1994年 | 7篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
排序方式: 共有480条查询结果,搜索用时 31 毫秒
11.
ABSTRACTThe present study was carried out to investigate the effect of three organic matters (stalk powder, microbial fertilizer, and manure) on Leymus chinensis germination, growth, and urease activity and available nitrogen (N) in coastal saline soil. The study was conducted in a completely randomized design with eight treatments: J0V0Y0, J1V0Y0, J0V1Y0, J0V0Y1, J1V1Y0, J1V0Y1, J0V1Y1, J1V1Y1. The notations were based on the quantities of each agent added to 1 kg of coastal saline soil: J0 – no straw powder, J1 – 0.2 kg straw powder, Y0 – no manure, Y1 – 0.3 kg manure, V0 – no microbial fertilizer, V1 – 0.2 L microbial fertilizer, each in quantic repeat. L. chinensis was sown as 50 seeds per pot. Results indicated that addition of organic agents exerted a significantly enhanced germination, increase in fresh weight and elevated soil urease activity. Soil available N levels were significantly positively correlated with soil urease activity and fresh weight, but not with germination rate. It is noteworthy that the halophyte L. chinensis showed improved characteristics when grown in coastal saline soil with addition of organic amendments. 相似文献
12.
Hou Jiaqi Li Mingxiao Xi Beidou Tan Wenbing Ding Jie Hao Yan Liu Dongming Liu Hongliang 《Environmental science and pollution research international》2017,24(26):21283-21297
Environmental Science and Pollution Research - Soil conditioners can be used to compensate for the insufficient soil nutrition and organic matter (OM) of arable soils. However, the traditional... 相似文献
13.
Cunxian Ma Guangshu Zhai Huimin Wu Izabela Kania-Korwel Hans-Joachim Lehmler Jerald L. Schnoor 《Environmental science and pollution research international》2016,23(3):2089-2098
Polychlorinated biphenyls (PCBs) are a group of persistent organic pollutants consisting of 209 congeners. Oxidation of several PCB congeners to hydroxylated PCBs (OH-PCBs) in whole poplar plants has been reported before. Moreover, 2,2′,3,5′,6-pentachlorobiphenyl (PCB95), as a chiral congener, has been previously shown to be atropselectively taken up and transformed in whole poplar plants. The objective of this study was to determine if PCB95 is atropselectively metabolized to OH-PCBs in whole poplar plants. Two hydroxylated PCB95s were detected by high-performance liquid chromatography-mass spectrometry in the roots of whole poplar plants exposed to racemic PCB95 for 30 days. The major metabolite was confirmed to be 4′-hydroxy-2,2′,3,5′,6-pentachlorobiphenyl (4′-OH-PCB95) by gas chromatography-mass spectrometry (GC-MS) using an authentic reference standard. Enantioselective analysis showed that 4′-OH-PCB95 was formed atropselectively, with the atropisomer eluting second on the Nucleodex β-PM column (E2-4′-OH-PCB95) being slightly more abundant in the roots of whole poplar plants. Therefore, PCB95 can at least be metabolized into 4′-OH-PCB95 and another unknown hydroxylated PCB95 (as a minor metabolite) in whole poplar plants. Both atropisomers of 4′-OH-PCB95 are formed, but E2-4′-OH-PCB95 has greater atropisomeric enrichment in the roots of whole poplar plants. A comparison with mammalian biotransformation studies indicates a distinctively different metabolite profile of OH-PCB95 metabolites in whole poplar plants. Our observations suggest that biotransformation of chiral PCBs to OH-PCBs by plants may represent an important source of enantiomerically enriched OH-PCBs in the environment. 相似文献
14.
Zhao Yan Zhang Jiaqi Guo Huixuan Hu Xiaomin Jiang Qiuli Wang Min 《Environmental science and pollution research international》2021,28(11):13264-13274
Environmental Science and Pollution Research - This paper presents a quantitative pollutant discharge model for a typical molybdenum roasting plant, which combines the best available technology and... 相似文献
15.
Gao Huadong Huang Yanli Li Wei Li Junmeng Ouyang Shenyang Song Tianqi Lv Fengyuan Zhai Wen Ma Kun 《Environmental science and pollution research international》2021,28(46):65363-65373
Environmental Science and Pollution Research - In the process of coal gangue surface accumulation and underground filling disposal, the heavy metals contained in coal gangue will inevitably... 相似文献
16.
在Anammox-UASB反应器中研究了亚硝氮停供及恢复供给后不同进水亚硝氮/氨氮比(R_I)对Anammox系统脱氮的影响,对Anammox系统停供亚硝氮培养后的污泥微生物群落进行了分析.结果表明,Anammox反应器在长期停供亚硝氮培养后,微生物多样性增加,氨氧化菌(Nitrosomonas)和Anammox菌都大量增殖,这两种微生物通过协同作用使得部分氨氮得以去除,NH_4~+-N最大去除速率可达68.77 mg·L~(-1)·d~(-1),出水p H低于进水.反应器恢复亚硝氮供给后,脱氮效果快速恢复.Anammox反应器中存在的氨氮"超量去除"现象是由氨氧化菌作用引起的,氨氧化菌活性易受亚硝氮浓度抑制.氨氮"超量去除"量占氨氮总去除量的百分比与R_I呈负相关关系.当R_I为0.17时,氨氮"超量去除"量占氨氮总去除量的百分比高达68.83%;当R_I增加到1.30∶1后,氨氮"超量去除"现象基本消失. 相似文献
17.
Liyan Feng Jun Zhai Lei Chen Wuqiang Long Jiangping Tian Bin Tang 《Mitigation and Adaptation Strategies for Global Change》2017,22(6):839-861
This paper employs a review of the technical literature to estimate the potential decrease in greenhouse gas (GHG) emissions that could be achieved by increasing the application of gas engines in China in three sectors: urban public transport vehicle; shipping; and thermal power plants. China’s gas engine development strategies and three types of gas resource are discussed in the study, which indicates that gas engines could decrease GHG emissions by 520 megatonnes (Mt) of carbon dioxide equivalent (CO2e) by 2020. This would account for 9.7 % of the government’s target for decreasing GHG emissions and is dominated by methane recovery from the use of coal mine gas (CMG) and landfill gas (LFG) for power generation. In the public urban transport vehicle and shipping sectors the low price of natural gas and the increasing demand for the control of harmful emissions could spur the rapid uptake of gas engine vehicles. However, the development of CMG- and LFG-fuelled power plants has been limited by the unwillingness of local enterprises to invest in high-performance gas engine generators and the associated infrastructure. Therefore, further compulsory policies that promote CMG use and LFG recovery should be implemented. Moreover, strict regulations on limiting methane leakage during the production and distribution of gas fuels are urgently needed in China to prevent leakage causing GHG emissions and largely negating the climate benefits of fuel substitution. Strategies for increasing the application of gas engines, promoting gas resources and recovering methane in China are instrumental in global GHG mitigation strategies. 相似文献
18.
用Micaps实时资料、CPAS卫星反演分析资料、NCEP再分析资料、ECMWF再分析资料,多普勒雷达PUP产品资料,对2015年12月1日夜间至2日凌晨沈阳地区罕见冬季降雨过程,进行了天气学分析、及大气微物理人工增雨作业条件分析,并结合沈阳地区人工增雨作业指标,得出本次降雨过程在厄尔尼诺正在发生的背景下,为常见的高空槽转东北冷涡型,水汽、动力等微物理作业条件也适合于开展人工增雨作业,并给出了相应的作业指导参数,为沈阳地区今后在冬季降雨天气过程中开展人工增雨作业积累了宝贵经验. 相似文献
19.
Effect of ammonium on nitrous oxide emission during denitrification with different electron donors 总被引:3,自引:0,他引:3
Nitrous oxide(N2O) emission during denitrification is receiving intensive attention due to its high potential to cause greenhouse effects.In this study,denitrifiers were acclimated in sequencing batch reactors with methanol or acetate as the electron donor and nitrate as the electron acceptor.The effects of ammonium on N2O emission were examined in batch experiments with various electron donors.With the addition of ammonium,N2O emission increased under all the examined conditions compared to experiments without ammonium addition.With different electron donors,the highest ratio of N2O emission to the removed oxidized nitrogen was 0.70% for methanol,5.34% for acetate,and 34.79% for polyhydroxybutyrate. 相似文献
20.