全文获取类型
收费全文 | 448篇 |
免费 | 6篇 |
国内免费 | 34篇 |
专业分类
安全科学 | 17篇 |
废物处理 | 21篇 |
环保管理 | 36篇 |
综合类 | 87篇 |
基础理论 | 47篇 |
污染及防治 | 208篇 |
评价与监测 | 40篇 |
社会与环境 | 31篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 15篇 |
2015年 | 11篇 |
2014年 | 9篇 |
2013年 | 31篇 |
2012年 | 11篇 |
2011年 | 33篇 |
2010年 | 20篇 |
2009年 | 23篇 |
2008年 | 23篇 |
2007年 | 28篇 |
2006年 | 27篇 |
2005年 | 14篇 |
2004年 | 18篇 |
2003年 | 44篇 |
2002年 | 18篇 |
2001年 | 23篇 |
2000年 | 14篇 |
1999年 | 5篇 |
1998年 | 5篇 |
1997年 | 18篇 |
1996年 | 6篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 4篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1971年 | 2篇 |
排序方式: 共有488条查询结果,搜索用时 93 毫秒
481.
Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant 总被引:10,自引:0,他引:10
Plant-accelerated dissipation of phenanthrene and pyrene in water in the presence of a nonionic-surfactant (Brij35) was studied. The mechanisms involved were evaluated, based on the investigation of plant uptake of these compounds from water with Brij35. The presence of ryegrass (Lolium multiflorum Lam) clearly enhanced the dissipation of tested PAHs in water with 0-296 mg l(-1) Brij35. The first-order rate constants (K), calculated from the first-order kinetic models for these PAH degradation (all significant at P < 0.05, n=8), of phenanthrene and pyrene in the presence of ryegrass were 16.7-50% and 47.1-108% larger than those of plant-free treatments, whereas half-lives (T1/2) of the former were 14.3-33.4% and 32.0-52.0% smaller than the latter, respectively. However, the promotion of PAH dissipation by ryegrass was found to significantly decrease with increasing Brij35 concentrations. In the range of 0-296 mg l(-1), low concentrations (< or = 74.0 mg l(-1)) of Brij35 generally enhanced plant uptake and accumulation of phenanthrene and pyrene, based on the observed plant concentrations and accumulated amounts of these chemicals from water. In contrast, Brij35 at relatively high concentrations (> or = 148 mg l(-1)) markedly restricted plant uptake of these PAHs. Plant accumulation of phenanthrene and pyrene accounted for 6.21-35.0% and 7.66-24.3% of the dissipation enhancement of these compounds from planted versus unplanted water bodies. In addition, plant metabolism was speculated to be another major mechanism of plant-accelerated dissipation of these PAHs in water systems. Results obtained from this study provided some insight with regard to the feasibility of phytoremediation for PAH contaminated water bodies with coexisted contaminants of surfactants. 相似文献
482.
Interactions of mycorrhizal fungi with Pteris vittata (As hyperaccumulator) in As-contaminated soils 总被引:8,自引:0,他引:8
A greenhouse trial was conducted to investigate the role of arbuscular mycorrhizas (AM) in aiding arsenic (As) uptake and tolerance by Pteris vittata (As hyperaccumulator) and Cynodon dactylon (a multi-metal root accumulator). Plants inoculated with lived and killed native mycorrhizas isolated from an As mine site were grown in a sterile and slightly acidic soil. The infectious percentage of mycorrhizas (0 mg/kg As: 26.4%, 50 mg/kg As: 30.3%, 100 mg/kg As: 40.6%) and the average biomass of shoots in infected P. vittata increased (0 mg/kg As: 2.45 g/pot, 50 mg/kg As: 2.48 g/pot, 100 mg/kg As: 10.9 g/pot) according to the increase of As levels when compared to control. The indigenous mycorrhizas enhanced As accumulation (0 mg/kg As: 3.70 mg/kg, 50 mg/kg As: 58.3 mg/kg; 100 mg/kg As: 88.1 mg/kg) in the As mine populations of P. vittata and also sustained its growth by aiding P absorption. For C. dactylon, As was mainly accumulated in mycorrhizal roots and translocation to shoots was inhibited. 相似文献
483.
水田土壤中水溶性有机物的产生动态及对土壤中重金属活性的影响:田间微区试验 总被引:41,自引:1,他引:40
采用田间微区试验研究不同施肥处理对土壤水溶性有机物 (DOM)的动态变化及其对土壤Cd活性的影响 结果表明 ,与施化肥对照处理相比 ,施用有机肥后土壤中DOM含量明显增加 .但随着水稻的生长DOM呈不断下降的趋势 ,而对照处理的变幅不大 ;在水稻整个生长过程中根际DOM含量不断增加且都高于对应时期土壤DOM的含量 ,并至水稻扬花期最大 ,此时 ,3种处理的根际产生DOM浓度 (DOM浓度以水溶性有机碳 (DOC)计 ,以下同 )分别为 :绿肥与化肥配施处理组 (GM) ( 14 0 2mg·L-1) >猪粪与化肥配施处理组 (PM) ( 11 12mg·L-1) >对照处理组 (F) ( 10 8mg·L-1) .水稻扬花期后 ,各处理的DOM含量不断下降 .试验还指出 ,有机肥施用后根际及土体土壤中交换态及有机结合态Cd含量显著增加 ,是对照处理的 2倍之多 ,同时发现 ,水稻收获后土壤交换态Cd的含量与此时的土壤DOM含量呈明显的正相关 (r土体 =0 92 6 6 ,n =8;r根际 =0 9389 ,n =8) .施用有机肥改良重金属污染土壤应该谨慎 相似文献
484.
485.
通过温室盆栽试验研究施用不同量及不同比例粉煤灰钝化污泥对土壤理化性质、玉米生长和重金属累积的影响。试验结果表明:施用粉煤灰钝化污泥能显著提高酸性土壤的pH值和Ca、Mg、B的含量,降低土壤的电导率和重金属的有效性。施用合适比例和合适量的粉煤灰钝化污泥能明显改善土壤的物理性质,增加土壤的N、P养分,并能显著提高玉米地上部干物重。10%和5%是高施用量和低施用量时合适的粉煤灰加入比例,施用此比例粉煤灰钝化污泥时,玉米的地上部干物重显著高于施用化肥的对照土壤或于之相当,且没有硼和重金属的毒害。 相似文献
486.
487.
YANG Zhong-yi CHEN Fu-hu YUAN Jian-gang ZHENG Zheng-wei WONG Ming-hung 《环境科学学报(英文版)》2004,16(4):670-673
Responses of Sesbania rostrata and S. cannabina to Pb, Zn, Cu and Cd toxicities were assessed by a seed-suspending seedbed(SSS) approach. The results showed that the SSS approach was suitable for testing the tolerance of a plant to the stress of toxic metals. The endpoints include seed germination success, straightened radicle and hypocotyl of the seedlings from the seeds. The measurements could be done easily and accurately. It was found that the elongation of radicle was the most sensitive indicator to the stress of heavy metals among the endpoints. When exposure to lower or medium concentrations of Pb, Zn, and Cd, the development of the lateral roots were favorable. Species of S. rostrata was more tolerant than S. cannabina to the heavy metals, especially to Zn and Cd. The ED50 of Pb, Zn, Cu and Cd were 32.90, .5.32, 4.40 and 12.00 μg/ml for S. rostrata,respectively, and they were 30.11, 2.87, 4.0.5 and 4.94 μg/ml respectively for S. cannabina. 相似文献
488.
Tan Huiyi Wong Keng Yinn Nyakuma Bemgba Bevan Kamar Haslinda Mohamed Chong Wen Tong Wong Syie Luing Kang Hooi Siang 《Environmental science and pollution research international》2022,29(5):6710-6721
Environmental Science and Pollution Research - In this study, a systematic procedure for establishing the relationship between particulate matter (PM) and microbial counts in four operating rooms... 相似文献