全文获取类型
收费全文 | 56篇 |
免费 | 0篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 3篇 |
环保管理 | 7篇 |
综合类 | 20篇 |
基础理论 | 13篇 |
污染及防治 | 12篇 |
评价与监测 | 3篇 |
社会与环境 | 1篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2017年 | 2篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 2篇 |
2012年 | 1篇 |
2011年 | 6篇 |
2010年 | 4篇 |
2009年 | 9篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 4篇 |
排序方式: 共有60条查询结果,搜索用时 642 毫秒
51.
利用胱氨酸生产废水开发氨基酸复合(混)固体肥料的研究 总被引:2,自引:0,他引:2
针对目前胱氨酸生产的处理和资源化所存有的问题,通过现场调查,室内模拟,生物试验,车间试生产等手段,探讨了利用胱氨酸生产废水开发氨基酸复合(混)固体肥料的原理和技术及其肥效和效益特点。 相似文献
52.
多元生物有机复合肥的推广应用 总被引:1,自引:0,他引:1
介绍了多元生物有机复合肥的主要功能、特点、推广应用状况、应用效果、社会经济效益. 相似文献
53.
Lyudmila Lyubenova Erika Nehnevajova Rolf Herzig Peter Schröder 《Environmental science and pollution research international》2009,16(5):573-581
Background, aim, and scope Tobacco, Nicotiana tabacum, is a widely used model plant for growth on heavy-metal-contaminated sites. Its high biomass and deep rooting system make
it interesting for phytoextraction. In the present study, we investigated the antioxidative activities and glutathione-dependent
enzymes of different tobacco clones optimized for better Cd and Zn accumulation in order to characterize their performance
in the field.
Main features The improved heavy metal resistance also makes the investigated tobacco clones interesting for understanding the plant defense
enzyme system in general. Freshly harvested plant material (N. tabacum leaves) was used to investigate the antioxidative cascade in plants grown on heavy metal contaminated sites with and without
amendments of different ammonium nitrate and ammonium sulfate fertilizers.
Materials and methods Plants were grown on heavily polluted soils in north-east Switzerland. Leaves were harvested at the field site and directly
deep frozen in liquid N2. Studies were concentrated on the antioxidative enzymes of the Halliwell–Asada cycle, and spectrophotometric measurements
of catalase (CAT, EC 1.11.1.6), ascorbate peroxidase (APX, EC 1.11.1.11), superoxide dismutase (SOD, EC 1.15.1.1), glutathione
peroxidase (GPX, EC 1.11.1.9), glutathione reductase (GR, EC 1.6.4.2), glutathione S-transferase (GST, EC 2.5.1.18) were performed.
Results and discussion We tried to explain the relationship between fertilizer amendments and the activity of the enzymatic defense systems. When
tobacco (N. tabacum) plants originating from different mutants were grown under field conditions with varying fertilizer application, the uptake
of cadmium and zinc from soil increased with increasing biomass. Depending on Cd and Zn uptake, several antioxidant enzymes
showed significantly different activities. Whereas SOD and CAT were usually elevated, several other enzymes, and isoforms
of GST were strongly inhibited.
Conclusions Heavy metal uptake represents severe stress to plants, and specific antioxidative enzymes are induced at the cost of more
general reactions of the Halliwell–Asada cycle. In well-supplied plants, the glutathione level remains more or less unchanged.
The lack of certain glutathione S-transferases upon exposure to heavy metals might be problematic in cases when organic pollutants coincide with heavy metal
pollution. When planning phytoremediation of sites, mixed pollution scenarios have to be foreseen and plants should be selected
according to both, their stress resistance and hyperaccumulative capacity. 相似文献
54.
Face-to-face interviews (n = 553) were conducted in five counties in East-Central China to study farmers’ fertilizer application behaviors, decision-making processes, attitudes towards adopting better fertilizer application technologies, and environmental consciousness. The survey results revealed widespread fertilizer misapplication and highly variable application behaviors in the study regions. The lack of scientific knowledge on fertilizers and the absence of guidance from agricultural extension services have forced the farmers to rely on personal judgment and advice from fertilizer dealers and friends to make decisions in fertilizer application. Overall, farmers have been idiosyncratic in fertilizer application with limited adoption of better fertilizer application technologies. There are great potentials for reducing pollutant load from agricultural runoff through promoting scientific fertilizer application in the regions. However, farmers’ diverse preferences over agricultural extension programs necessitate an integrated approach emphasizing farmer involvement throughout the development of such programs for promoting better fertilizer application practices. 相似文献
55.
Olli Dahl Risto Pöykiö Hannu Nurmesniemi 《Journal of Material Cycles and Waste Management》2008,10(1):87-92
In Finland, the new limit values for heavy metals in fertilizers used in agriculture and in forestry came into force in March
2007, and for materials used as earth construction agents, in June 2006. From the utilization point of view, it was notable
that the total heavy metal concentrations (Cd, Cu, Pb, Cr, Mo, Zn, As, Ni, Ba, and Hg) in fly ash from a coal-fired power
plant were lower than those limit values. The concentrations of the easily soluble elements Ca, Mg, Na, P, and Zn in the fly
ash were between 3.5 and 35 times higher than those found in the coarse mineral soils of Finland. Fly ash is a potential agent
for soil remediation and for improving soil fertility. If inorganic materials and by-products are utilized in earthworks,
the content of harmful compounds must be low and the harmful components must be tightly bound to the matrix. Therefore, a
five-stage sequential extraction procedure was used to evaluate the extractability of different elements in fly ash into the
following fractions: (1) the water-soluble fraction, (2) the exchangeable fraction (CH3COOH), (3) the easily reduced fraction (NH2OH-HCl), (4) the oxidizable fraction (H2O2 + CH3COONH4), and (5) the residual fraction (HF + HNO3 + HCl). 相似文献
56.
57.
58.
Human urine as a source of alternative natural fertilizer in agriculture: A flight of fancy or an achievable reality 总被引:2,自引:0,他引:2
Organically agricultural products are gaining popularities through out the world as it gives the consumer satisfaction with a basket of safer and better trusted foods. It is also well established that intensive conventional agricultural practices can introduce contaminants into the food chain with adverse affect on environment. However, organic agricultural practices give an alternative environmental friendly sustainable agriculture among the farmers. Beside this fact, organic crops contain fewer nitrates, nitrites, pesticide residues and trace elements than conventional crops. Even though, in organic systems generally have 20% lower yields than conventionally produced crops. One of the major constrains of organic farming is decrease of raw organic matters to prepare compost. Therefore, scientists are looking forward for different organic sources which are plenty in nature and available at little-to-no cost. Human urine is one of them, and has been gaining popularities as a raw material for organic cultivation. However, several important merits and demerits of application of human urine are needed to be addressed in agriculture. 相似文献
59.
Kentaro Hayashi Nobuhisa Koga Yosuke Yanai 《Atmospheric environment (Oxford, England : 1994)》2009,43(35):5702-5707
The present study aimed to investigate the NH3 volatilization loss from field-applied compost and chemical fertilizer and evaluate the atmosphere–land exchange of NH3 and particulate NH4+ (pNH4) at an upland field with volcanic ash soil (Andosol) in Hokkaido, northern Japan. Two-step basal fertilization was conducted on the bare soil surface. First, a moderately fermented compost of cattle manure was applied by surface incorporation (mixing depth, 0–15 cm) at a rate of 117 kg N ha−1 as total nitrogen (T-N) corresponding to 9.9 kg N ha−1 as ammoniacal nitrogen (NH4–N). Twelve days later, a chemical fertilizer containing 10% (w/w) of NH4–N as a mixture of ammonium sulfate and ammonium phosphates was applied by row placement (cover depth, 3 cm) at a rate of 100 kg N ha−1 as NH4–N. The study period was divided into the first-half, beginning after the compost application (CCM period), and the second-half, beginning after the chemical fertilizer application (CF period). The mean air concentrations of NH3 and pNH4 (1.5 m height) were 7.6 and 3.0 μg N m−3, respectively, in the CCM period; the values were 3.7 and 3.9 μg N m−3, respectively, in the CF period. The composition ratios of NH3 to the sum of NH3 and pNH4 (1.5 m height) were 72% and 49% in the CCM and CF periods, respectively. The NH3 volatilization loss from the compost was 0.8% of the applied T-N (or 9.3% of the applied NH4–N) and that from the chemical fertilizer was near zero. Excluding the period immediately after the compost application, the upland field acted as a net sink for NH3 and pNH4. 相似文献
60.
实现秸秆资源化利用的主要途径 总被引:22,自引:0,他引:22
随着我国农村经济的发展和能源供应的改善,部分经济较发达地区出现了秸秆过剩的现象,田间直接燃烧秸秆造成了严重的环境问题。文章认为秸秆作为农业的副产品,是一种有用的资源。介绍了4种秸秆资源化利用的途径,包括能源利用技术、肥料利用技术、饲料利用技术以及用于工业原料的技术。 相似文献