共查询到20条相似文献，搜索用时 736 毫秒
1.
硫酸根自由基高级氧化技术对污染场地多环芳烃的修复效果研究 总被引：1，自引：1，他引：1
硫酸根自由基高级氧化技术(sulfate radical(SO_4~(·–))based advanced oxidation processes,SR-AOPs)是一种被广泛应用于降解土壤有机污染物的原位氧化修复技术。然而,关于SR-AOPs降解土壤多环芳烃(polycyclic aromatic hydrocarbons,PAHs)的报道相对较少。本研究以南京某炼钢厂附近土壤作为试验样本,通过设置不同比例混合体系的过硫酸钠(Na_2S_2O_8)和亚铁离子(Fe~(2+))以及反应不同时间,探究SR-AOPs对土壤中16种PAHs的修复效果以及最佳技术方案。结果表明:Na_2S_2O_8和Fe~(2+)的配比会显著影响土壤PAHs的降解效果,当两者比例达到10︰1时,即Na_2S_2O_8用量为5 mmol/g,Fe~(2+)用量为0.5 mmol/g,反应时间为24 h时,PAHs总降解率最高,可达到29.32%;不同环数的PAHs决定了SR-AOPs的降解效果,其中SR-AOPs对四环PAHs降解效率最高,总降解率达到37.32%;此外,降解效率随反应时间增加而增加,在24 h达到效果最佳。因此,本研究结果可为SR-AOPs修复土壤PAHs提供理论依据。 相似文献
2.
自20世纪60年代"绿色革命"以来,育种技术和农耕技术的发展促进了农作物产量的大幅提升,然而作物的营养品质出现下降趋势。在相似的遗传背景下,大气CO_2浓度升高会使单位体积农作物产品的营养元素含量下降,因此"绿色革命"至今,农作物产品的营养元素下降可能受大气CO_2浓度升高影响。通过植物生长箱模拟"绿色革命"初期和目前的大气CO_2浓度水平(310μmol/mol和400μmol/mol),针对主要C_3作物水稻、小麦和大豆,研究"绿色革命"以来大气CO_2浓度升高对其籽粒的C、N、Fe、Zn元素含量的影响,结果表明:CO_2浓度升高对3种作物籽粒的C元素含量几乎没有影响,变化幅度在±1.5%之间;籽粒的N、Fe、Zn元素含量普遍呈现下降趋势,但均未达到显著水平。 相似文献
3.
湘西植烟土壤有机质和全氮时空变异特征研究 总被引：1，自引：0，他引：1
为揭示湖南省湘西州烟区土壤有机质(SOM)和全氮(TN)的时空变异特征和为合理施用有机肥和氮肥提供科学依据,采用经典统计学、地统计学和GIS等方法,对湘西州2000年和2015年植烟土壤SOM和TN时空变异特征进行了研究。结果表明:2015年SOM和TN平均含量较2000年分别增加了5.03g/kg和0.31g/kg,增幅分别达21.39%和21.99%,SOM和TN含量的最小值变小,变异系数、最大值和极差变大,Moran’sI指数标准化Z值下降,块金效应增加;SOM和TN含量"低""适宜"等级面积分别下降了3.42%、37.73%和2.04%、44.43%,"高""极高"等级面积分别增加了32.21%、8.94%和35.67%、10.80%。表明湘西植烟土壤SOM和TN含量和变异同时增加,SOM和TN空间自相关性减弱,随机变异性增强。植烟土壤SOM与TN含量表现出极显著的正线性相关,SOM的矿化释放是TN的一个主要来源。 相似文献
4.
Bhutia Nangsol D. Sureja Amish K. Munshi A. D. Verma Manjusha Arya Lalit Krishnan S. Gopala Gurung B. 《Genetic Resources and Crop Evolution》2022,69(7):2485-2500
Genetic Resources and Crop Evolution - Luffa hermaphrodita Singh & Bhandari, known as Satputia, a semi-wild taxon originating from L. graveolens is an underutilized vegetable. It has a... 相似文献
5.
Water, Air, & Soil Pollution - Precipitation was collected from May 15, 2001 to November 18, 2002, at the mountain top (620 m a.s.l.) and mountain foot (47 m a.s.l.) of the... 相似文献
6.
Eurasian Soil Science - Chernozem humic acid (HA) fractions with nominal molecular sizes (MS) >100, 30–100, 5–30 and <5 kDa were obtained, using a combination of... 相似文献
7.
Bainbridge Zoe Lewis Stephen Smithers Scott Wilkinson Scott Douglas Grant Hillier Stephen Brodie Jon 《Journal of Soils and Sediments》2016,16(2):687-706
Journal of Soils and Sediments - The purpose of this study is to define the relative contributions of fine (<10 μm) suspended sediment from tributaries within the Burdekin... 相似文献
8.
Adhikari Sneha Joshi Anjali Kumar Amarjeet Singh Narendra Kumar 《Genetic Resources and Crop Evolution》2021,68(7):2983-2995
Genetic Resources and Crop Evolution - Zea mays ssp. parviglumis is the progenitor of maize and assume to have tolerance against various biotic and abiotic stresses. It... 相似文献
9.
Water, Air, & Soil Pollution - The layered double hydroxides (LDHs) with a hydrotalcite-like structure are believed to possess great potentials as environmental remediation materials including... 相似文献
10.
Eurasian Soil Science - The quantitative and qualitative diversity of the clay fraction (<1 µm) from parent materials (BC and C horizons), albic (suprasolonetzic eluvial SEL)... 相似文献
11.
Lattier Jason D. Ballard Harvey E. Kramer Matthew Pooler Margaret R. 《Genetic Resources and Crop Evolution》2022,69(6):2203-2216
Genetic Resources and Crop Evolution - Corylopsis Seibold & Zucc. is a genus of flowering shrubs with few cultivars and little information on genome size, ploidy levels, and genetic... 相似文献
12.
Bao Zhanxia Wang Shuhua Yu Xiaoying Gao Yindong Wen Zeling 《Water, air, and soil pollution》2019,230(7):1-24
Water, Air, & Soil Pollution - Intrinsic molecular parameters (solubility, chemical structure, etc.) as well as physico-chemical properties of the medium (lithology, permeability, organic... 相似文献
13.
María Luisa Rubio Teso Elena Torres Lamas Mauricio Parra-Quijano Lucía de la Rosa Juan Fajardo José M. Iriondo 《Genetic Resources and Crop Evolution》2018,65(4):1237-1253
Crop wild relatives (CWR) have recently received significant attention due to their value as plant genetic resources and their contribution to world food security. We present a prioritized checklist of CWR in Spain in which the criteria of crossability with crops of economic importance, endemicity and threat status have been taken into account. First, we selected a list of genera corresponding to the most relevant crops for Spain and at the international level. These crops were classified into use categories (Food, Forage & Fodder, Ornamental, and Industrial & Other uses) depending on their main use. The wild plant species native to Spain belonging to these genera were then listed. After evaluation by national experts in plant breeding, the resulting checklist contained 929 species. Further selection based on crossability, endemicity and threat status led to the generation of the Prioritized Spanish Checklist of crop wild relatives containing 578 species. Thirty-two percent of these species belong to the Forage & Fodder use category, 28% to the Ornamental category, 24% to the Food category and 16% to the Industrial & Other uses category. Thirty-five percent of the prioritized species are endemic to Spain, and over one-fourth are classified under some category of threat according to the International Union for Conservation of Nature. Endemicity and threat status rates in the Prioritized Spanish Checklist of CWR were higher than those found in the prioritized CWR inventories of other countries. A ex situ assessment reporting number of accessions showed that 70% of the prioritized Spanish CWR have accessions preserved in genebanks. 相似文献
14.
El foulani Abdellah-Anouar Jamal-eddine Jamal Lekhlif Brahim 《Water, air, and soil pollution》2020,231(10):1-12
Water, Air, & Soil Pollution - Atmospheric precipitation in Sri Lanka occurs mainly through rain whose terrestrial composition significantly varies based on the location as the regional... 相似文献
15.
Talebi Seyed Mehdi Arianejad Fatemeh Tabaripour Raheleh Mahdiyeh Majid 《Genetic Resources and Crop Evolution》2022,69(6):2087-2103
Genetic Resources and Crop Evolution - Marrubium parviflorum Fisch. & C.A. Mey. and Marrubium cuneatum Russell, are naturally distributed in various parts of Iran. It is difficult to... 相似文献
16.
Viscardi Michelle Hoffelder da Silveira Luís Felipe Vargas Luciano Kayser da Silva Fernanda Rabaioli Beneduzi Anelise 《Water, air, and soil pollution》2020,231(6):1-16
Water, Air, & Soil Pollution - Cu-based copper nanoclusters have generated a great deal of interest based on for their fluorescent and catalytic properties. However, as heterogeneous catalysts,... 相似文献
17.
Water, Air, & Soil Pollution - Tailings originating from the U ore processing operation are returned to the mine as back-fill and the rest are dumped in a manmade or naturally available... 相似文献
18.
Water, Air, & Soil Pollution - Apparent steady-state diffusion coefficients, Da, were measured in an oxidizing environment at 24°C for Tc (as TcO4 ?) in bentonite at dry densities,... 相似文献
19.
Water, Air, & Soil Pollution - Land treatment is increasingly being utilized as a method of waste disposal for both sewage effluent and sludges. While there has been considerable attention... 相似文献
20.
Water, Air, & Soil Pollution - The cytotoxicity of more than 50 elements was surveyed using suspensions of Nicotiana tabacum (‘xanth’) protoplasts. Fifty-two elements were tested as... 相似文献