全文获取类型
收费全文 | 776篇 |
免费 | 14篇 |
国内免费 | 94篇 |
专业分类
安全科学 | 36篇 |
废物处理 | 31篇 |
环保管理 | 78篇 |
综合类 | 333篇 |
基础理论 | 82篇 |
污染及防治 | 229篇 |
评价与监测 | 79篇 |
社会与环境 | 15篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 10篇 |
2022年 | 11篇 |
2021年 | 29篇 |
2020年 | 22篇 |
2019年 | 15篇 |
2018年 | 13篇 |
2017年 | 16篇 |
2016年 | 19篇 |
2015年 | 24篇 |
2014年 | 30篇 |
2013年 | 43篇 |
2012年 | 41篇 |
2011年 | 72篇 |
2010年 | 38篇 |
2009年 | 52篇 |
2008年 | 51篇 |
2007年 | 44篇 |
2006年 | 46篇 |
2005年 | 33篇 |
2004年 | 26篇 |
2003年 | 39篇 |
2002年 | 26篇 |
2001年 | 24篇 |
2000年 | 30篇 |
1999年 | 17篇 |
1998年 | 23篇 |
1997年 | 21篇 |
1996年 | 11篇 |
1995年 | 8篇 |
1994年 | 14篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 2篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有884条查询结果,搜索用时 207 毫秒
831.
选用GDX-102树脂其对水中小分子有机物和腐殖酸共同存在时的吸附集集作用,发现当有HA存在时,树脂对小分子有机物的吸附率显著增加,且是可逆的,先后用CH2Cl2和NH3;乙醇进行分级洗脱,得到满意的洗脱回收率。 相似文献
832.
833.
834.
In much of sub-Saharan Africa (SSA), the lack of organic soil amendments constitutes one of the principal causes for declining soil fertility in intensifying farming systems. The challenge, therefore, remains to increase the availability of organic inputs and to develop recommendations for their combination with inorganic fertilizers. An on-farm experiment was conducted in the northern Guinea savanna of Nigeria to evaluate the fertilizer effect of rice (Oryza sativa L.) mill waste (RMW) on a degraded Alfisol. The decomposition and nutrient (N and P) release patterns of RMW were studied using the litterbag technique, and the effect on maize yield and soil properties was determined. The RMW was applied at rates of 0, 5, 10, and 15 Mg DM ha−1 and was applied either unburnt or burnt (farmers’ practice). In both years, compound fertilizer was broadcast during land preparation on all plots at rates of 40 kg N ha−1, 17 kg P ha−1, and 33 kg K ha−1.Results obtained in the litterbag study showed that, at maize harvest, more than 90% of the P had been released from the decomposing RMW. However, around 60% of the organic C and 45% of the N still remained. Compared to the control treatment (0 Mg ha−1 RMW), which yielded 0.55 Mg ha−1, maize (Zea mays L.) grain yields were increased by 95% when 10 Mg ha−1 of unburnt RMW was applied, and by 147% with 15 Mg ha−1 (mean of 2 years). In contrast, burnt RMW did not result in significant yield increases. The cumulative application of 30 Mg ha−1 of unburnt RMW significantly increased the soil organic carbon in the surface soil from 0.7% (0 Mg ha−1 RMW) to 1.3%.The results of this investigation indicate that RMW constitutes a valuable organic input in the Guinea savanna if applied unburnt at rates of 10–15 Mg ha−1 in combination with inorganic fertilizer. The repeated application of unburnt RMW may contribute to the rehabilitation of degraded soils through the buildup of soil organic matter. 相似文献
835.
836.
高效含氯有机化合物降解工程菌的构建研究 总被引:18,自引:0,他引:18
采用原生质体融合技术,将两株具有含氯有机化合物降解特性的菌--1T和RB-1融合构建成一株高效降解含氯有机化合物工程菌。实验得出:当溶菌酶浓度为1.5mg/ml,酶解60min时,假单胞菌和诺卡氏菌的原生质体形成率分别为33.3%和44.4%;在30%PEG6000助融下10min二者的融合率为0.3%。应用于造纸漂白废水,融合菌去除CODCr和TCL的能力 比混合菌分别提高了72.05%和190%. 相似文献
837.
非均相光催化氧化研究进展 总被引:6,自引:0,他引:6
光催化氧化技术是一种新兴的高效节能现代水处理技术,本文从半导体光催化氧化的机制,各类污染物光催化降解的现状,光催化剂活性的研究现状,固定相光催化氧的进展,光催化氧化技术发展中存在问题等方面进行综述 相似文献
838.
839.
840.
A grazing experiment was started in 1984 and 1989 respectively, in two parts of a dune grassland in the nature reserve ‘Zwanenwater’,
North Holland; a third part with similar geology and topography was used as a control area and not grazed. An evaluation of
the effects of grazing on vegetation patterns, species composition, vegetation structure and humus form was made with the
help of vegetation maps from 1986 and 1992 as well as field surveys.
Dense tall-grass communities dominated byAmmophila arenaria increased over the period 1986–1992 in the grazed areas, and especially in the non-grazed area (increase in area to 20 %,
22 % and 50 %, respectively). Open communities decreased in the grazed areas, but are still prevalent, while in the ungrazed
area they virtually disappeared, with the result that the present percentage areas are 53 %, 38 % and 17 %.
Field survey data were classified by TWINSPAN producing four vegetation types. These occur more or less equally in grazed
and ungrazed areas, albeit with different percentage areas: (1) open vegetation dominated byCorynephorus canescens; (2) open vegetation characterized byKoeleria macrantha; (3) heathland dominated byEmpetrum nigrum; and (4) tall-grass communities dominated byAmmophila arenaria. Within a vegetation type, species composition was only marginally affected by grazing regime.
Within the open communities the number of species, vegetation height, vegetation cover and soil organic horizons were not
affected by grazing. In the tall-grass communities the number of species was significantly larger and the height of the vegetation
significantly lower in the area grazed since 1984. In the heathland community the number of species and cover of the moss
layer were significantly higher in the 1984 area and ectorganic and endorganic horizons significantly thicker in the ungrazed
area.
It is suggested that these effects are the result of an increased availability of light, but possibly also of a decreased
stock of organic matter and nutrients, due to a decreased input of litter and accelerated rates of decomposition.
Nomenclature: Van der Meijden et al. (1992) for phanerogams; Corley et al. (1981) for mosses; Grolle (1983) for hepatics. 相似文献