495 results match your criteria macroaggregates

Insights into the inhibition effects of Cd on soil enzyme activities: From spatial microscale to macroscale.

J Hazard Mater 2021 Jun 1;418:126274. Epub 2021 Jun 1.

State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address:

Cd is a heavy metal with high toxicity and adverse influence on the activities of soil enzymes. However, how Cd toxicity varies with the microenvironment or different regions needs further investigation. In this study, 17 soil samples were collected from different locations in China. Read More

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Metagenomic insights into nitrogen and phosphorus cycling at the soil aggregate scale driven by organic material amendments.

Sci Total Environ 2021 Sep 24;785:147329. Epub 2021 Apr 24.

College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, China. Electronic address:

The soil microbiome, existing as interconnected communities closely associated with soil aggregates, is the key driver in nutrient cycling. However, the underlying genomic information encoding the machinery of the soil microbiome involved in nutrient cycling at the soil aggregate scale is barely known. Here comparative metagenomics and genome binning were applied to investigate microbial functional profiles at the soil aggregate scale under different organic material amendments in a long-term field experiment. Read More

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September 2021

60 years of fertilization and liming impacts on soil organic carbon stabilization in a sub-tropical Alfisol.

Environ Sci Pollut Res Int 2021 Apr 21. Epub 2021 Apr 21.

Environmental Sciences and Biomedical Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India.

Limited information is available on the C stabilization mechanism of tropical soils under different management practices including long-term organic manuring, mineral fertilization alone, or in combination with lime. Hence, to understand the effect of continuous application (for 60 years) of organic manure, fertilizer, and lime alone or in combination on an acidic Alfisol, stabilization of soil organic carbon (SOC) was evaluated under maize (Zea mays L.) wheat (Triticum aestivum L. Read More

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Nitrogen addition stimulates soil aggregation and enhances carbon storage in terrestrial ecosystems of China: A meta-analysis.

Glob Chang Biol 2021 Jun 10;27(12):2780-2792. Epub 2021 Apr 10.

Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.

China is experiencing a high level of atmospheric nitrogen (N) deposition, which greatly affects the soil carbon (C) dynamics in terrestrial ecosystems. Soil aggregation contributes to the stability of soil structure and to soil C sequestration. Although many studies have reported the effects of N enrichment on bulk soil C dynamics, the underlying mechanisms explaining how soil aggregates respond to N enrichment remain unclear. Read More

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Associated soil aggregate nutrients and controlling factors on aggregate stability in semiarid grassland under different grazing prohibition timeframes.

Sci Total Environ 2021 Jul 27;777:146104. Epub 2021 Feb 27.

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling 712100, China; CAS Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China. Electronic address:

Grazing prohibition is an effective measure in improving soil stability and ecological quality. However, only a limited number of studies have been published on the dominant factors that impact soil aggregate stability and their associated effects on nutrient distribution for different size soil aggregates under long-term grazing prohibition management. In this study, we investigated variation in soil aggregate stability and nutrient distribution characteristics in semiarid grassland sites under different grazing prohibition timeframes (0 years [GP0], 11 years [GP11], 26 years [GP26], and 36 years [GP36]). Read More

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Effects of green manure planted in winter and straw returning on soil aggregates and organic matter functional groups in double cropping rice area.

Ying Yong Sheng Tai Xue Bao 2021 Feb;32(2):564-570

Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China.

To explore the mechanism of exogenous organic materials enhancing soil organic carbon and soil fertility, based on a long-term experiment located in Hengyang Red Soil Experimental Station, we examined the effects of winter green manure and straw returning patterns (CK, winter fallow; MV, winter Chinese milk vetch; S, early-season rice straw total returning; DS, early-season and late-season rice straw total returning; SMV, winter Chinese milk vetch + early-season rice straw total returning; DSMV, winter Chinese milk vetch + early-season and late-season rice straw total returning) on soil aggregates and organic functional groups. The results showed that the proportion of super aggregates (>2 mm) and macroaggregates (0.25-2 mm) in double cropping rice soil was the highest with a ratio of about 72. Read More

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February 2021

Tillage effects on soil properties and crop yield after land reclamation.

Sci Rep 2021 Feb 25;11(1):4611. Epub 2021 Feb 25.

Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi'an, 710075, China.

Tillage treatments have an important effect on soil microstructure characteristics, water thermal properties and nutrients, but little is known in the newly reclaimed cultivated land. For the reason, a long-term field study was to evaluate the tillage effects on soil physicochemical properties and crop yield in newly reclaimed cultivated land via the macroscopic and microscopic analysis. Three tillage treatments were tested: continuous conventional moldboard plow tillage (CT), sub-soiling/moldboard-tillage/sub-soiling tillage (ST) and no-tillage/sub-soiling/no-tillage (NT). Read More

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February 2021

Effect mechanism of biochar application on soil structure and organic matter in semi-arid areas.

J Environ Manage 2021 May 20;286:112198. Epub 2021 Feb 20.

College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, 010018, China. Electronic address:

There are global concerns regarding soil remediation and water conservation in arid and semi-arid areas. Studying the mechanism and factors influencing soil structure and organic matter content is very important for soil remediation and the rational utilization of water resources. We tracked the changes in soil aggregates and organic matter content during the growth period of maize using different application rates of straw biochar (10, 20, 30, and 50 t/ha) to investigate the effects of biochar on the structure of weakly alkaline soil. Read More

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How different are the arsenic fractions inhibit alkaline phosphatases on aggregates scale?

Sci Total Environ 2021 Jun 9;774:145728. Epub 2021 Feb 9.

College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, Shaanxi, China. Electronic address:

Arsenate [As(V)], in general, is associated with various aggregates and exists as different species in soil, which in turn influences its toxicity and potential contamination. Previous studies have demonstrated the usefulness of alkaline phosphatases (ALP) to evaluate As(V) pollution. However, the effect of different arsenic fractions on ALP among soil aggregates is still unclear. Read More

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Microbial metabolic response to winter warming stabilizes soil carbon.

Glob Chang Biol 2021 May 13;27(10):2011-2028. Epub 2021 Feb 13.

Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK.

Current consensus on global climate change predicts warming trends with more pronounced temperature changes in winter than summer in the Northern Hemisphere at high latitudes. Moderate increases in soil temperature are generally related to faster rates of soil organic carbon (SOC) decomposition in Northern ecosystems, but there is evidence that SOC stocks have remained remarkably stable or even increased on the Tibetan Plateau under these conditions. This intriguing observation points to altered soil microbial mediation of carbon-cycling feedbacks in this region that might be related to seasonal warming. Read More

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Signs of tracheobronchitis may constitute the principal finding on the lung SPECT/CT images of COVID-19 patients.

Eur J Nucl Med Mol Imaging 2021 Jan 8. Epub 2021 Jan 8.

Department of Nuclear Medicine, Nancyclotep, CHRU-Nancy, Université de Lorraine, Nancy, France.

Background: This study aimed to analyze the rates of tracheobronchitis signs observed on the ventilation scans of COVID-19 patients with shortness of breath, with comparisons to a non-COVID population.

Methods: Lung scintigraphy was collected in 10 such COVID patients, as well as from a non-COVID population investigated outside the epidemic wave period, on a CZT-SPECT/CT system, with ventilation images recorded with Tc-labeled Technegas® and perfusion images with Tc-labeled albumin macroaggregates.

Results: A diffuse tracheobronchial uptake was observed on the ventilation scans from 3 COVID patients (30%), whereas this rate was 3% (3/90) in the non-COVID group (P = 0. Read More

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January 2021

Combined Impact of No-Till and Cover Crops with or without Short-Term Water Stress as Revealed by Physicochemical and Microbiological Indicators.

Biology (Basel) 2021 Jan 1;10(1). Epub 2021 Jan 1.

Dipartimento di Scienze e Tecnologie Alimentari per la Sostenibilità Della Filiera Agro-Alimentare (DISTAS), Facoltà di Scienze Agrarie Alimentari ed Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy.

Combining no-till and cover crops (NT + CC) as an alternative to conventional tillage (CT) is generating interest to build-up farming systems' resilience while promoting climate change adaptation in agriculture. Our field study aimed to assess the impact of long-term NT + CC management and short-term water stress on soil microbial communities, enzymatic activities, and the distribution of C and N within soil aggregates. High-throughput sequencing (HTS) revealed the positive impact of NT + CC on microbial biodiversity, especially under water stress conditions, with the presence of important rhizobacteria (e. Read More

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January 2021

Recipes for Human Albumin Macroaggregates.

J Nucl Med 2020 12;61(Suppl 2):12S-13S

UCLA School of Medicine, Los Angeles, California

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December 2020

Investigations of the effect of the amount of biochar on soil porosity and aggregation and crop yields on fertilized black soil in northern China.

PLoS One 2020 17;15(11):e0238883. Epub 2020 Nov 17.

Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China.

The combination of chemical fertilizer and biochar is regarded as a useful soil supplement for improving the properties of soil and crop yields, and this study describes how the biochar of maize straw can be used to improve the quality of the degraded black soil. This has been achieved by examining the effects of combining different amounts of biochar with chemical fertilizer on the porosities and aggregate formation of soil and exploring how these changes positively impact on crop yields. A field trial design combining different amounts of maize straw biochar [0 (NPK), 15. Read More

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December 2020

Application of earthworm cast improves soil aggregation and aggregate-associated carbon stability in typical soils from Loess Plateau.

J Environ Manage 2021 Jan 26;278(Pt 1):111504. Epub 2020 Oct 26.

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, 712100, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address:

Earthworm casts exhibit remarkable fertility and have been widely used as an organic fertilizer. This study focused on the effects of earthworm cast application on soil aggregates and aggregate-associated carbon in typical soils from the Loess Plateau (China). Soil column experiments were conducted in the laboratory using cultivated loessial soil (CS), dark loessial soil (DS), and aeolian soil (AS). Read More

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January 2021

Regulation of soil aggregate size under different fertilizations on dissolved organic matter, cellobiose hydrolyzing microbial community and their roles in organic matter mineralization.

Sci Total Environ 2021 Feb 2;755(Pt 2):142595. Epub 2020 Oct 2.

Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

The mineralization of soil organic matter is closely related to climate change. Labile organic matter and microbial community are vital intrinsic factors in controlling the mineralization of soil organic matter. Regulation of soil aggregate size on dissolved organic matter (DOM), the cellobiose hydrolyzing microbial community, and their roles in organic matter mineralization remains unclear. Read More

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February 2021

Earthworms accelerate rice straw decomposition and maintenance of soil organic carbon dynamics in rice agroecosystems.

PeerJ 2020 17;8:e9870. Epub 2020 Sep 17.

Institute of Eco-Environmental and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai, China.

Background: To promote straw degradation, we inoculated returned farmland straw with earthworms (). Increasing the number of earthworms may generally alter soil organic carbon (SOC) dynamics and the biological activity of agricultural soils.

Methods: We performed soil mesocosm experiments with and without earthworms to assess the decomposition and microbial mineralization of returned straw and soil enzyme activity across different time periods. Read More

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September 2020

Soil microbial community, enzyme activity, C and N stocks and soil aggregation as affected by land use and soil depth in a tropical climate region of Brazil.

Arch Microbiol 2020 Dec 3;202(10):2809-2824. Epub 2020 Aug 3.

São Paulo State University, UNESP, Av. Universitária 3780, Botucatu, SP, CEP 18610-034, Brazil.

The impact of agricultural land-use on soil microbial community composition and enzyme activity has not been extensively investigated in Ultisols. We investigated soil health parameters by analyzing phospholipid fatty acids (PLFAs), extracellular enzyme activity, C and N stocks, and soil structure. Four land uses were established in a tropical climate region of Brazil: native Cerrado (savanna), monoculture pasture [Urochloa brizantha (Hochst. Read More

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December 2020

[Response of Aggregate Distribution to Input Straw and Their Linkages to Organic Carbon Mineralization in Soils Developed from Five Different Parent Materials].

Huan Jing Ke Xue 2020 Jun;41(6):2842-2851

School of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.

Development and the dynamics of stable aggregates in many soils are known to be closely related to the cycling as well as accumulation of soil organic carbon (SOC). This study explored the aggregation processes and distributions of soil organic carbon in soils developed from limestone (L), quaternary red earth (Q), granite (G), basalt (B), and tertiary red sandstone (T) subtropical China related to the addition of maize residues during 7 days and 184 days of incubation. The soils were sieved to<0. Read More

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Spatio-temporal dynamics of arbuscular mycorrhizal fungi and soil organic carbon in coastal saline soil of China.

Sci Rep 2020 06 17;10(1):9781. Epub 2020 Jun 17.

Halophyte Research Lab, Nanjing University, Nanjing, 210093, China.

A comprehensive understanding of the relationship between arbuscular mycorrhizal (AM) fungi and coastal saline soil organic carbon (SOC) is crucial for analysis of the function of coastal wetlands in soil carbon sequestration. In a field experiment, the temporal and spatial dynamics of AM fungi, glomalin-related soil protein (GRSP) - which is described as a N-linked glycoprotein and the putative gene product of AM fungi, SOC, and soil aggregates were investigated in halophyte Kosteletzkya virginica rhizosphere soil of coastal saline areas of North Jiangsu, China. Soil samples were collected from a depth of up to 30 cm in two plantation regions from August 2012 to May 2013. Read More

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Understanding the role of biochar in mitigating soil water stress in simulated urban roadside soil.

Sci Total Environ 2020 Oct 1;738:139798. Epub 2020 Jun 1.

Department of Applied Environmental Science, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446701, Republic of Korea; Department of Environmental Science and Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446701, Republic of Korea. Electronic address:

Biochar has been proposed as a promising amendment that may improve soil structure. However, our understanding how it mitigates extreme soil water stress in roadside soils is limited. In this study, we investigated the effects of biochar on soil properties and plant growth under extreme water stress conditions. Read More

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October 2020

31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol.

Sci Rep 2020 06 3;10(1):9041. Epub 2020 Jun 3.

Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, P.R. China.

Evaluation of soil organic carbon (SOC) dynamics is often limited by the complexity of soil matrix. Quantitative information on the distribution of SOC within aggregate hierarchy will help elucidate the carbon flow in soil matrix. However, this knowledge still needs to be documented. Read More

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Drought changed soil organic carbon composition and bacterial carbon metabolizing patterns in a subtropical evergreen forest.

Sci Total Environ 2020 Sep 20;736:139568. Epub 2020 May 20.

Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, Center for Global Change and Ecological Forecasting, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restorations, Shanghai 200241, China; Shanghai Institute of Eco-Chongming, Shanghai 200241, China. Electronic address:

Subtropical forests are considerable carbon sinks in the northern hemisphere, yet are increasingly suffering from the impact of extreme drought. To better understand the dynamics and kinetics of forest soil carbon storage under long-term drought, a rainfall-reduction experiment was established in a subtropical evergreen forest of eastern China. Soil organic carbon (SOC) composition, microbial carbon metabolism and the interactions with soil microbial community structure were investigated across different soil aggregate size fractions. Read More

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September 2020

Long-term influence of maize stover and its derived biochar on soil structure and organo-mineral complexes in Northeast China.

Environ Sci Pollut Res Int 2020 Aug 16;27(22):28374-28383. Epub 2020 May 16.

Biochar Engineering Technology Research Center of Guangdong Province, School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, Guangdong, China.

The influence of biochar on the soil structure and aggregate stability has been debated in previous studies. To probe the action of biochar on soil aggregates, a 5-year field experiment was implemented in the brown earth soil of northeastern China. We determined the aggregate distribution (> 2000 μm, 250-2000 μm, 53-250 μm, and < 53 μm) and organic carbon (OC) and organo-mineral complex contents both in the topsoil (0-20 cm) and within the soil aggregates. Read More

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Tc-Ga-ICG-Labelled Macroaggregates and Nanocolloids of Human Serum Albumin: Synthesis Procedures of a Trimodal Imaging Agent Using Commercial Kits.

Contrast Media Mol Imaging 2020 22;2020:3629705. Epub 2020 Jan 22.

Fondazione IRCCS Policlinico San Matteo, Nuclear Medicine Unit, 27100 Pavia, Italy.

Recent developments in sentinel lymph node (SLN) and radio occult lesion localization (ROLL) highlight the need for a multimodal contrast agent, providing better presurgical PET imaging and improved intraoperative mapping thanks to fluorescence detection. For this reason, we have studied a trimodal SLN/ROLL targeting agent (Tc-Ga-ICG) with commercially available kits of macroaggregated or nanocolloidal albumin (MA/NC-HSA). Ga PET imaging does provide better spatial resolution and makes it possible to predict signal intensity during surgery. Read More

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January 2020

Lindavia intermedia (Bacillariophyceae) and Nuisance lake Snow in New Zealand: Chitin Content and Quantitative PCR Methods to Estimate Cell Concentrations and Expression of Chitin Synthase.

J Phycol 2020 10 9;56(5):1232-1244. Epub 2020 Jun 9.

Department of Zoology, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.

Lake snow, caused by the freshwater centric diatom Lindavia intermedia, has become problematic in several large, oligotrophic New Zealand lakes over the past decade. Macroaggregates produced by L. intermedia foul fishing lines, intake screens, and water filters, and have a negative impact on recreational values. Read More

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October 2020

Effects of Robinia pseudoacacia afforestation on aggregate size distribution and organic C dynamics in the central Loess Plateau of China: A chronosequence approach.

J Environ Manage 2020 Aug 6;268:110558. Epub 2020 May 6.

College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling, 712100, Shaanxi, China. Electronic address:

Afforestation has been proven to have enormous potential for carbon (C) sequestration; however, the dynamics of aggregate-associated organic carbon (OC) following afforestation and their contribution to changes in bulk soil OC are not well understood in regions with serious soil erosion. Therefore, we investigated the dynamics of OC associated with aggregates along a Robinia pseudoacacia (RP) afforestation chronosequence in the Loess Plateau. Soil aggregate size distribution and OC dynamics in bulk soil were analyzed 10, 18, 28, and 42 years after RP afforestation at depths of 0-20 cm and 20-40 cm. Read More

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Arbuscular mycorrhizal fungal species identity governs plant water content and soil aggregation improvements under wet-dry climate conditions.

Environ Sci Pollut Res Int 2020 Oct 10;27(30):37377-37383. Epub 2020 Apr 10.

Research Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan.

Our study aimed to uncover the functions of two species of arbuscular mycorrhizal fungi (AMF) in soil aggregation and plant water content regulation under wetting-drying climate conditions. The climatic characteristics of seasonal drought in karst areas were simulated. Two watering periods were established in a controlled greenhouse to compare the different effects of two genetically different AMF species (Funneliformis mosseae and Rhizophagus intraradices) on the water content of 90-day-old mulberry seedlings and on soil aggregates. Read More

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October 2020

Effect of compost and inorganic fertilizer on organic carbon and activities of carbon cycle enzymes in aggregates of an intensively cultivated Vertisol.

PLoS One 2020 12;15(3):e0229644. Epub 2020 Mar 12.

State Experimental Station of Agro-Ecosystem in Fengqiu, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, People's Republic of China.

Background And Aims: This paper was primarily devoted to understand the interactions of soil aggregates, organic carbon (C) and carbon cycle enzymes in aggregates under different fertilization managements, aiming to identify the effects of organic and inorganic fertilizer amendments on soil organic C accumulation and the activities of carbon cycle enzymes within aggregates in Vertisol.

Methods: A Vertisol soil following 4-year compost and inorganic fertilizer amendments, i.e. Read More

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Effects of tillage, crop establishment and diversification on soil organic carbon, aggregation, aggregate associated carbon and productivity in cereal systems of semi-arid Northwest India.

Soil Tillage Res 2019 Jul;190:128-138

International Maize and Wheat Improvement Centre (CIMMYT), Kathmandu, Nepal.

Intensive tillage based management practices are threatening soil quality and systems sustainability in the rice-wheat belt of Northwest India. Furthermore, it is accentuated with puddling of soil, which disrupts soil aggregates. Conservation agriculture (CA) practices involving zero tillage, crop residue management and suitable crop rotation can serve as better alternative to conventional agriculture for maintaining soil quality. Read More

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