搜索结果: 46-60 共查到“知识库 土壤化学”相关记录820条 . 查询时间(3.312 秒)
Using HYDRUS to simulate the dynamic changes of Ca2+ and Na+ in sodic soils reclaimed by gypsum
cation exchange ion transport leaching
2016/2/22
Sodic soils are characterized by the occurrence of excess sodium to levels that can adversely affect soil structure. In recent years, with the advent of alternatives for reclaiming sodic soils, such a...
THE USE OF SOIL-LANDSCAPE RELATIONSHIPS MODELLING AND GEOTECHNOLOGIES FOR DETAILING THE SOIL MAP OF DISTRITO FEDERAL IN BRAZIL
Soil Survey Soil Landscape Model Soil Geomorphology GIS Soil Genesis Soil Mapping Soil Classification
2015/8/31
The population growth in the Distrito Federal has lead to indiscriminate occupation and use of its lands. To evaluate the current
conditions of the environment, the maps of the region’s natural reso...
砷污染土壤磷酸盐淋洗修复技术研究
污染土壤 砷 淋洗 磷酸钾
2015/8/10
淋洗修复技术是治理砷污染土壤的一种高效快速方法．本研究通过砷污染土壤批量振荡淋洗实验，筛选出环境友好且高效的淋洗剂磷酸
钾，系统分析液固比、淋洗时间、淋洗液浓度、ｐＨ 对土壤中砷的去除效果的影响，确定磷酸钾的最佳淋洗条件．进一步以磷酸钾为基本淋洗剂，
采用不同试剂和磷酸钾进行组合二步淋洗，探究最佳复合淋洗组合．结果表明，磷酸钾在浓度为 ０．５ ｍｏｌ·Ｌ
－１
、液固比为 ４ ｍＬ·ｇ
...
单一和复合溶液中Cu2＋对三种土壤Se02－3吸附的影响
竞争吸附 添加顺序 土壤
2015/8/10
采用批量吸附实验，研究了塿土、黑土和红壤对单一 ＳｅＯ
２－
３ 及其与 Ｃｕ
２＋ 共存条件下的吸附特征，并分析了 Ｃｕ
２＋ 添加顺序对 ３ 种土壤
ＳｅＯ
２－
３ 吸附的影响，旨在为揭示土壤中铜硒复合污染中金属的迁移转化提供依据．结果表明，塿土、黑土和红壤对单一及 Ｃｕ
２＋
⁃ＳｅＯ
２－
３ 复合溶液
中 ＳｅＯ
２－
３ 的吸附是一个先快后慢的...
土壤环境因子对氯胺嘧草醚除草活性的影响
土壤环境因子 土壤质地 氯胺嘧草醚 除草活性
2016/3/17
采用常规室内生物测定法,研究了土壤环境因子对氯胺嘧草醚[开发代号ZJ1835,化学名称为N-(2-氯-6-(4,6-二甲氧基嘧啶-2-氧基)苄基)苯胺]除草活性的影响。结果表明:土壤质地、pH值、有机质含量、土壤湿度和温度对其除草活性均能产生一定影响。氯胺嘧草醚在砂土和黏土中的活性高于壤土,其除草活性随土壤有机质含量、pH值和土壤湿度的升高而升高,而温度偏高或偏低均不利于其药效发挥,在15～25 ...
Sorption of heavy metals in organic horizons of acid forest soils at low added concentrations
acidic soils adsorption desorption organic matter risk elements
2015/3/13
The individual adsorption/desorption of Cu, Pb, and Zn in six soil samples taken from organic horizons of acid forest soils is studied in batch experiments. These three metals were chosen because of t...
Modelling the impact of acid deposition on forest soils in North Bohemian Mountains with two dynamic models: the Very Simple Dynamic Model (VSD) and the Model of Acidification of Groundwater in Catchments (MAGIC)
air pollution Black Triangle historical deposition long-term modelling mass balance soil solution soil chemistry
2015/3/13
Enormous acid deposition that culminated in the 1970s contributed largely to accelerate the process of acidification of soils in northern Bohemia. As a consequence a wide forest decline occurred short...
Retention characteristics of acetochlor in soils collected from different depths in relation to soil properties (Žitny ostrov area, SW Slovakia)
chloroacetanilide herbicide desorption leaching potential sorption
2015/3/10
Determination of the sorption-desorption of herbicides within soil profile is one of the first steps in predicting their leaching potential. Batch experiments were performed to evaluate the influence ...
Contamination of the soil and water environment by heavy metals in the former mining area of Rudňany (Slovakia)
copper environmental loads soil enzymes soil and water pollution toxic elements
2015/3/10
Contamination of soil and water environment by heavy metals in a former mining area and their effect on the soil characteristics were determined. Soil samples were collected in the village of Rudňany ...
Effect of agricultural lands afforestation and tree species composition on the soil reaction, total organic carbon and nitrogen content in the uppermost mineral soil profile
acidification afforestation carbon nitrogen soil reaction
2015/3/10
Forests occupy one third of the world’s land area and govern carbon (C) transfers and influence nitrogen (N) content in the biosphere. Afforestation leads to soil changes of specific dynamics, often a...
Systematic geochemical study of the soils, litter, and bedrock of a Permian limestone mountain, Central Japan
chemical composition enrichment factor nutrient plant
2015/3/9
The paper deals with the results of a systematic geochemical study of soils at Mt Kinshozan in Central Japan, a limestone area known for its well-preserved Permian fossils. Compared with the typical c...
Potassium fixation in soil size fractions of arid soils
calcareous soils Iran smectite soil fractionation
2015/3/9
Amounts of potassium (K) fixed in soil fractions of 10 calcareous soils of southern Iran were measured to evaluate the contributions of different soil size fractions to K fixation. Soil particles were...
Study of podzolization process under different vegetation cover in the Jizerské hory Mts. region
grass micromorphological features podzolization process soil water retention spruce forest
2015/3/9
The development of Podzols is conditioned by many factors. One of them is vegetation cover. The aim of this study was to examine in detail special chemical properties, micromorphological features and ...
Environmental impact of landfill on groundwater quality and agricultural soils in Nigeria
chemical land use parameters pollution wastes water
2015/3/5
Physical, chemical and bacteriological analyses were carried out of water samples from three boreholes located near a landfill, and or soil samples at Akure, Nigeria, to ascertain the effect of the du...
Persistent organochlorine pesticides and polychlorinated biphenyls in intensive agricultural soils from North India
accelerated solvent extraction (ASE) agricultural soil organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs)
2015/3/3
Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were determined in agricultural soils from the northern states of India. The average concentration of OCPs was 37.67 ± 0.33 ng/g (...