全文获取类型
收费全文 | 124篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 5篇 |
环保管理 | 9篇 |
综合类 | 32篇 |
基础理论 | 21篇 |
污染及防治 | 24篇 |
评价与监测 | 20篇 |
社会与环境 | 12篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 15篇 |
2012年 | 8篇 |
2011年 | 4篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 3篇 |
2005年 | 6篇 |
2004年 | 1篇 |
2003年 | 5篇 |
2002年 | 6篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1989年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1973年 | 1篇 |
1969年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1956年 | 2篇 |
排序方式: 共有127条查询结果,搜索用时 15 毫秒
71.
72.
In a region that is highly sensitive to tectonic instability, the fragile nature of the Himalayas becomes further adversely affected by anthropogenic intervention. In the present study observations indicate that the landsliding process occurs along various tectonic zones where it is assisted by human activities. Bedding and joint plane dip slopes, high joint and joint set frequencies, low vegetation cover, high monsoonal rainfall, thin soil cover and anthropogenic activities were found to be the main causative factors of the landslides. Anthropogenic activities include local path, canal and road construction, mining and quarrying, overgrazing, deforestation and unscientific agricultural practices, such as tilling steeper slopes (>30) without contour benches and without provision of drainage ditches, and overcropping without giving rest to the overtaxed soils. Where slope conditions are critical human activities should be controlled so as to minimise the slope failure processes. Various recommendations are proposed. 相似文献
73.
Relationship between rainfall and spring discharge study is important to understand hydrological behaviour of springs and water resources management. In the Himalayan mountains springs are the freshwater sources for household consumption. We studied six springs of different recharge area characteristics in two micro-watersheds in western Himalayan mountains in India. Based on the recharge area geology these springs were divided into fracture/joint (FR/JT) and fracture/joint/colluvium (FR/JT/COLL). We found a strong positive relationship between rainfall and spring discharge. Peak spring discharge coincided with peak rainfall in two FR/JT/COLL springs, which was delayed by about one month in FR/JT springs. Mean annual discharge was about two times greater for FR/JT/COLL springs than the FR/JT springs (6.47 vs. 3.94 liter per minute). But spring discharge per 1000 L of rainfall in spring recharge area for FR/JT springs was about 2.3 times greater than the FR/JT/COLL springs (49 vs. 21 liter per minute). In the FR/JT springs, rainfall in spring recharge area and spring discharge were weakly related (r=0.174), while they were strongly related in FR/JT/COLL springs (r=0.595). In the former category of springs decline in discharge was gradual, while it was rapid in the latter category of springs. Therefore, with regard to sustained supply of water for household consumption FR/JT springs can be considered more suitable. Land use and land cover such as moderately grazed pasture, abandoned agricultural terraces and few trees but dense growth of bushes and oak forest in the spring recharge area were found conducive for spring discharge and may be promoted for long-term water resource conservation in this region. 相似文献
74.
Studies were carried out to determine the physiological response of few economically important tree species viz., Mango (Mangifera indica), Eucalyptus citriodora, Sagon (Tectona grandis) and Sal (Shorea robusta) to roadside automobile pollution during 2004–2005. By determining some physiological parameters, which included chlorophyll
a, and b, total chlorophyll, carotenoids, ascorbic acid, pH and relative water content, impact of automobile exhaust on these species
was assessed. The data obtained were further analyzed by using one-way ANOVA and a significant change in all these parameters
was found in the leaf samples collected from road side trees, exposed to automobile exhausts in comparison to control. Higher
value of air pollution tolerance index (APTI) was recorded for S. robusta (9.02) while the minimum value of APTI was recorded for M. indica (6.76). 相似文献
75.
Manika Gupta N. K. Garg Himanshu Joshi M. P. Sharma 《Environmental monitoring and assessment》2014,186(3):1639-1654
The present study was undertaken to study the trends of transport of thiram, a dithiocarbamate pesticide, at different time and depth in the fields under real field conditions for wheat crop. Numerical simulations were carried out by solving the coupled soil–water content movement and mass transport equations using HYDRUS- 1D. The supplementary data used for paramaterization of HYDRUS-1D comprise of irrigation treatments, climatic conditions, and soil characteristics. Results focus on the effects and influence of irrigation treatments on pesticide persistence and mobility. Modelling results were in good agreement with the experimentally determined thiram concentrations. Application of the model to measured field data of thiram movement indicates that the modelling approach can provide reliable and useful estimates of the mass flux of water and non-volatile pesticide in vadose zone. For policy-makers and planners, some regulation strategies are suggested for controlling inappropriate pesticide application under deficit irrigation or rain-fed conditions. 相似文献
76.
Soil to leaf transfer factor for the radionuclides ²²⁶Ra, ⁴⁰K, ¹³⁷Cs and ⁹⁰Sr at Kaiga region, India
James JP Dileep BN Ravi PM Joshi RM Ajith TL Hegde AG Sarkar PK 《Journal of environmental radioactivity》2011,102(12):1070-1077
Transfer factors are the most important parameters required for mathematical modeling used for environmental impact assessment of radioactive contamination in the environment. In this paper soil to leaf transfer factor for the radionuclides 40K, 226Ra, 137Cs and 90Sr is estimated for Kaiga region in Karnataka state, India. Among the plants in which study is carried out, 226Ra, 40K, 137Cs and 90Sr activity in leaves of herbaceous plants is higher than that of tree leaves. Soil to leaf transfer factor for 226Ra, 40K, 137Cs and 90Sr was found to be in the range of 0.03-0.65, 0.32-8.04, 0.05-3.03 and 0.42-2.67 respectively. 相似文献
77.
Seedling establishment in harsh environment was a rare and sporadic event due to the prevalent high temperatures and low moisture
regimes. Also in response to harsh conditions seedlings establishment of many species appear to be more frequent under canopies
of nurse plants. In these interactions the seedling benefit from the micro environment created by the adult nurse plants.
In Himalaya some of the host plants are typically colonizer of nutrient-poor soils in habitats such as eroded soils and rocky
surfaces. Many of the plants themselves do not yield economic goods, but they can promote the growth of more useful plants
and have potential for reclamation of nutrient poor soils. 相似文献
78.
79.
Prashant?HegdeEmail author Kimitaka?Kawamura H.?Joshi M.?Naja 《Environmental science and pollution research international》2016,23(7):6102-6118
The aerosol samples were collected from a high elevation mountain site, Nainital, in India (1958 m asl) during September 2006 to June 2007 and were analyzed for water-soluble inorganic species, total carbon, nitrogen, and their isotopic composition (δ13C and δ15N, respectively). The chemical and isotopic composition of aerosols revealed significant anthropogenic influence over this remote free-troposphere site. The amount of total carbon and nitrogen and their isotopic composition suggest a considerable contribution of biomass burning to the aerosols during winter. On the other hand, fossil fuel combustion sources are found to be dominant during summer. The carbon aerosol in winter is characterized by greater isotope ratios (av. ?24.0?‰), mostly originated from biomass burning of C4 plants. On the contrary, the aerosols in summer showed smaller δ13C values (?26.0?‰), indicating that they are originated from vascular plants (mostly of C3 plants). The secondary ions (i.e., SO4 2?, NH4 +, and NO3 ?) were abundant due to the atmospheric reactions during long-range transport in both seasons. The water-soluble organic and inorganic compositions revealed that they are aged in winter but comparatively fresh in summer. This study validates that the pollutants generated from far distant sources could reach high altitudes over the Himalayan region under favorable meteorological conditions. 相似文献
80.
Shrestha RA Lama B Joshi J Sillanpää M 《Environmental science and pollution research international》2008,15(4):303-307
Goal, scope, and background Arsenic contamination in groundwater creates severe health problems in the world. There are many physiochemical and biological
methods available for remediation of arsenic from groundwater. Among them, microbial remediation could be taken as one of
the least expensive methods, though it takes longer treatment time. The main objective of this research was to study the improvement
on remediation by addition of some essential ion salts such as Mn and Fe.
Materials and methods
Staphylococcus aureus, Bacillus subtilis, Klebsiella oxytoca, and Escherichia coli were taken as model microbes from Dhulikhel, 30 km east from Kathmandu, Nepal.
Results and discussion Microbes used in this study showed different abilities in their removal of As(III) with and without addition of Mn and Fe
salts. The trend of remediation increased with time. S. aureus was found to be the best among the microbes used. It showed almost 100% removal after 48-h culture, both with and without
Fe and Mn salts. Rate of removal of As increased with addition of Fe and Mn for all microbes. Removal efficiency was found
to increase by about 32% on average after addition of salts in 24-h cultures of S. aureus. 相似文献