New insights into organic-mineral particles: composition, properties and models of molecular structure

Schulten, H.‐R.; Leinweber, Peter

doi:10.1007/s003740050020

Cited by 279 publications

(189 citation statements)

References 116 publications

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“…1). Different chemical properties of organic carbon in the amendments can influence the response of aggregation [20] . It has been reported that different macroaggregate distribution patterns were observed, when native prairie, cultivated and two restoration treatments were compared [9] .…”

Section: Resultsmentioning

confidence: 99%

Distribution of β-Glucosidase Activity within Aggregates of a Soil Amended with Organic Fertilizers

Hojati¹,

Nourbakhsh²

2009

American J. of Agricultural and Biological Sciences

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Problem statement: Distribution pattern of enzyme activities in soil aggregate size classes as affected by organic amendments is not well understood. Approach: A study was conducted to evaluate the effects of repeated annual application of Cow Manure (CM), Sewage Sludge (SS) and Municipal Solid Waste Compost (MSW) on the distribution of β-Glucosidase (βG) activity within aggregates of a soil. Soil samples were collected from 0-15 cm of a soil which, had been treated annually from 1999-2006 at 4 application rates with three replications. A control (with no application) was also run. Soil organic C content and βG activity were measured in 5 aggregate size fractions. Results: Results illustrated that application of the amendments decreased the proportion of microaggregates (<0.25 mm). The proportion ranged from 64% in control to 35% in MSW. In contrast, the proportion of macroaggregates (>0.25 mm diameter) enhanced from 35% in control to 65% in MSW. Application of organic amendments modified the distribution of Soil Organic C (SOC) content and βG activity. Distribution of SOC in macroaggregate classes was not identical in CM, SS and MSW treatments. The distribution pattern of βG activities in aggregate size classes was dissimilar to those of SOC contents. In general, an increasing trend was observed in βG activity as the aggregate sizes increased. The highest level of βG activity was observed in aggregate size classes of >2 mm of all applied soils. Among the solid waste treatments, CM induced greater βG activity in macroaggregates. For all aggregate size classes, the lowest level of βG activity was observed in control. Conclusion/Recommendations: To conclude, organic fertilization increased the proportion of macroaggregates to microaggregates. The highest activities of βG and SOC contents were observed in macroaggregates and in soils received the highest rates of organic fertilizer applications.

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Section: Resultsmentioning

confidence: 99%

Distribution of β-Glucosidase Activity within Aggregates of a Soil Amended with Organic Fertilizers

Hojati¹,

Nourbakhsh²

2009

American J. of Agricultural and Biological Sciences

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“…The higher clay content plus lower average annual temperature (Tables 1 and 2) in the VG region may have had an influence. On clay particles, C is stabilized mainly by association with soil minerals, resulting in protection against biological degradation (Schulten & Leinweber, 2000;Kaiser et al, 2002;Dalmolin et al, 2006). In soils under eucalyptus, pasture and native forest at 10 Australian sites, with SOC varying from 19 to 83 g kg -1 (0-10 cm), Mendham et al (2002) observed that in general, SOC contents were higher and C mineralization rates lower in finer texture soils.…”

Section: Discussionmentioning

confidence: 99%

Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model

Lima

Silva

Stape

et al. 2011

Rev. Bras. Ciênc. Solo

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Soil organic matter (SOM) plays an important role in carbon (C) cycle and soil quality. Considering the complexity of factors that control SOM cycling and the long time it usually takes to observe changes in SOM stocks, modeling constitutes a very important tool to understand SOM cycling in forest soils. The following hypotheses were tested: (i) soil organic carbon (SOC) stocks would be higher after several rotations of eucalyptus than in low-productivity pastures; (ii) SOC values simulated by the Century model would describe the data better than the mean of observations. So, the aims of the current study were: (i) to evaluate the SOM dynamics using the Century model to simulate the changes of C stocks for two eucalyptus chronosequences in the RESUMO: MODELAGEM DAS MUDANÇAS NOS ESTOQUES DE CARBONO ORGÂNICO DE SOLOS DISTINTOS APÓS QUATRO ROTAÇÕES DO EUCALIPTO NO SUDESTE DO BRASIL COM O MODELO CENTURY A matéria orgânica do solo (MOS) tem importantes funções no ciclo de C e na qualidade do solo. Considerando a complexidade dos fatores que controlam a ciclagem da MOS e o tempo necessário para que as mudanças sejam nela observadas, a modelagem constitui uma ferramenta muito importante para entender a ciclagem da MOS em solos florestais. As hipóteses do estudo foram: o cultivo do eucalipto por várias rotações resultaria no aumento dos estoques de C do solo, quando comparado a pastagens degradadas; e os valores dos estoques de C do

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“…This was the additional key factor decidedly controlling geochemical processes of Zn compounds and their further transfer to other environmental compartments [42][43]. These factors are the geo-environmental barriers efficiently reducing metals mobility and their further uptake by plants [40,[44][45].…”

Section: +mentioning

confidence: 99%

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

Diatta¹,

Andrzejewska²,

Chudzińska³

et al. 2016

Pol. J. Environ. Stud.

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The aim of our study was to evaluate the mobility of Zn in soils subjected to the activity of a zinc smelter and to assess the contamination of 1-and 2-year-old needles of Scots pine species sensitive to and tolerant of heavy metal contamination, particularly zinc. The trees were selected on the basis of their morphology, i.e., tolerant ones exhibited quite normal growth shape, but sensitive ones were more or less dwarves. Mineralogical composition revealed the prevalence of kaolinite in all soils except for two samples, where smectite dominated. Zinc contamination exceeded 30 times the geochemical background, and the reactive Zn forms represented 34.6% of total Zn content (Zn Total ). Proton generation capacity (α) indices calculated for the bioavailable Zn fraction (Zn Bio ) were 59% higher compared to the reactive Zn pool (Zn Reac ). Two-year-old tolerant (T) pine needles accumulated 21.9, 38.2, and 13.6% more Zn, Fe, and Mg, respectively, as compared to 1-year-old ones. For sensitive (S) needles, the range followed: 12.4, 48.8, and 7.3%, respectively. Iron was considered a "strategic survival element" for both pines growing under high zinc pollution.The transfer of Zn ions from the soil environment to plants still remains the basic source of maintaining its high concentrations in the needles, since air emissions ceased in 1996. The amounts of Zn accumulated by Scots pine at crucial years of metallurgical emissions may be considered as an additional time-constant source due to the evergreen vegetative lifecycle.

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New insights into organic-mineral particles: composition, properties and models of molecular structure

Cited by 279 publications

References 116 publications

Distribution of β-Glucosidase Activity within Aggregates of a Soil Amended with Organic Fertilizers

Distribution of β-Glucosidase Activity within Aggregates of a Soil Amended with Organic Fertilizers

Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model

Biogeochemical Assessment of a Zn-Contaminated Site Using Scots Pine (Pinus sylvestris L.) Needles as Phytoindicators

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