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Effects of organic fertilizers on organic carbon accumulation in alkalized saline soil and silage maize yield

International Journal of Agricultural and Biological Engineering 2024年第2期17卷 159-168页

作者： Lidong Ji Lei Li Rui Wang Xing Xu Fengju Zhang Guilian Mao Teng Wang School of Forestry and Prataculture Ningxia UniversityYinchuan750021China School of Agriculture Ningxia UniversityYinchuan750021China School of Ecological Environment Ningxia UniversityYinchuan 750021China School of Life Sciences Ningxia UniversityYinchuan 750021China

To understand the combined effect of organic and chemical fertilizers on soil carbon emissions and carbon balance of a farmland ecosystem,this study investigated the organic fertilizer nitrogen replacing different proportions of chemical fertilizer *** results showed that,compared to F_(100),the O_(15)F_(85) treatment increased the yield and net ecosystem productivity carbon sequestration of silage maize under mild,moderate,and severe salinization levels,as well as the contents of soil organic carbon,microbial carbon,and humin carbon,while reducing plant carbon *** O_(15)F_(85) treatment did not significantly increase soil carbon emissions(CEC),but O_(30)F_(70),O_(45)F_(55) and O_(100) treatments significantly increased *** soil carbon balance analysis showed that the farmland ecosystem was a“sink”for atmospheric CO_(2) under each *** O_(15)F_(85) treatment produced an“excitation effect”to enhance the carbon sink effect of silage maize farmland under mild,moderate and severe salinization levels while maintaining stable production and *** the O_(100) treatment increased the carbon sink of farmland under different salinization levels,the yield was significantly reduced and did not represent practical production *** analysis showed that soil organic carbon components and ecosystem carbon balance were closely related to soil total salt,pH and bulk density,while soil dissolved organic carbon,humus carbon components and carbon emissions were closely related to soil moisture and ***,the purpose of improving the carbon sink of saline-alkali land can be achieved through soil salt inhibition,soil structure remodeling and water supplement and warming regulation,which provides technical and theoretical support for reducing carbon emissions,achieving carbon neutrality and alleviating global warming.

关键词： carbon balance carbon component organic carbon organic substitution saline-alkali land

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Nano-CaO_(2)Promotes the Release of carbon Sources from Municipal Sludge and the Preparation of Double-Network Hydrogels with High Swelling Ratios

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Journal of Renewable Materials 2023年第3期11卷 1237-1253页

作者： Yalin Li Yu Huang Lei Liu Haozhao Liu Haiyang He Dongxue Lu Tingting Dong School of College of Environmental and Biological Engineering Henan University of EngineeringZhengzhou451191China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

In this study,hydrogels were prepared from municipal sludge to recycle and realize the value-added utilization of the carbon components in this abundant waste *** carbon sources were extracted from the municipal sludge using synthesised nano CaO_(2)as an oxidant,and the carbon sources were graft copolymerised with acrylic acid monomer using N,N′-methylenebisacrylamide as a crosslinking agent and ammonium persulfate as an *** factors influencing the hydrogel preparation were investigated by single-factor *** on the results of the single-factor experiments,a hydrogel with a swelling ratio of up to 19768.4%at 12 h was prepared with an oxidant dosage of 0.20 g,a monomer dosage of 5.8 g,a neutralisation degree of the monomer of 70%,an initiator dosage of 0.15 g,and a crosslinking agent dosage of 0.15 *** hydrogel preparation conditions were optimized using the response surface method,and the interactions between the different reaction conditions were analysed to obtain the best preparation conditions.X-ray diffraction results showed that hydrogels were amorphous in *** electron microscopy images showed that the SiO_(2)particles from the sludge acted as crosslinking points between different layers of hydrogel *** crosslinking polymerisation and crosslinking agent worked together to form hydrogels with an inorganic-organic double network structure,and this structure was highly stretchable,resulting in hydrogels with good swelling properties.

关键词： Oxidant municipal sludge carbon component swelling property hydrogel

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carbon Characterization of Size-Segregated Particulate Matters(PMs) in Residential and Educational Areas in Padang City, Indonesia

Carbon Characterization of Size-Segregated Particulate Matte...

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作者： Muhammad Amin Rahmi Mulia Putri Fadjar Goembira Mitsuhiko Hata Masami Furuuchi Graduate School of Natural Science and Technology Kanazawa University Department of Environmental Engineering Faculty of EngineeringAndalas University Faculty of Geoscience and Civil Engineering Institute of Science and EngineeringKanazawa University Faculty of Environmental Management Prince of Songkla University

Size-segregated of particulate matter(PM) including PM0.1 at two different sites, i.e., educational(EA) and residential(RA) areas in Padang city, Indonesia were sampled by using a cascade type air sampler for 24 hours with the average flowrate 40 l/m throughout three weeks(March, 08 th-25 th 2018). carbonaceous components were analyses by a carbon analyzer following the IMPROVEOR protocol. Average PM2.5 and PM10 concentrations in RA were higher than those in EA while being below the NAAQS of Indonesia. However, it was much higher compared to the WHO limit for 24 hours in RA. OC was the dominant fraction in TC. OC/EC ratio ranging from 2.4 to 33.0 was similar at both sites, suggesting the OC was emitted from various sources. Char-EC and soot-EC ratio were founded to be minimized for PM0.1(0.40 ± 0.27 and 0.39 ± 0.39, respectively at each site), indicating a more influence of burning of fossil fuel as vehicles exhaust and coal combustion. The transboundary influence of open biomass burning was not so significant although it cannot be ignored.

关键词： Size-Segregated Particle PM0.1 Residential Educational carbon component Indonesia

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