Water stability of soil aggregates in different systems of tillage

Bartlová, Jaroslava; Badalíková, Barbora; Pospíšilová, Lubica; Pokorný, Eduard; Šarapatka, B.

doi:10.17221/132/2014-swr

Cited by 48 publications

(31 citation statements)

References 34 publications

(27 reference statements)

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“…The precipitation, evapotranspiration, soil textures, landform types, and many other confounding factors are involved in determining soil moisture conditions. Many of these factors are less sensitive to decadal or multidecadal climate changes, for example, soil textures and landforms, and serve as a buffer in counteracting the warming effect on soil water processes (Bartlová et al, ; Martinez et al, ). Our results highlight that atmospheric aridity increases with warming over Tibetan grasslands, suggesting that the drought effect would be probably underestimated if only precipitation‐based drought indices were considered.…”

Section: Discussionmentioning

confidence: 99%

Increasingly Important Role of Atmospheric Aridity on Tibetan Alpine Grasslands

Ding

Tao

Zhao

et al. 2018

Geophysical Research Letters

159

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Pronounced warming occurring on the Tibetan Plateau is expected to stimulate alpine grassland growth but could also increase atmospheric aridity that limits photosynthesis. But there lacks a systematic assessment of the impact of atmospheric aridity on alpine grassland productivity. Here we combine satellite observations, flux‐tower‐based productivity, and model simulations to quantify the effect of atmospheric aridity on grassland productivity and its temporal change between 1982 and 2011. We found a negative impact of atmospheric vapor pressure deficit on grassland productivity. This negative effect becomes increasingly intensified in terms of the impact severity and extent, suggesting an increasingly important role of atmospheric aridity on productivity. We further demonstrated that this negative effect is mitigated but cannot be overcompensated by the positive effect of rising CO2. Given that vapor pressure deficit is projected to further increase by ~10–38% in the future, Tibetan alpine grasslands will face an increasing stress of atmospheric drought.

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Section: Discussionmentioning

confidence: 99%

Increasingly Important Role of Atmospheric Aridity on Tibetan Alpine Grasslands

Ding

Tao

Zhao

et al. 2018

Geophysical Research Letters

159

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“…The size distribution and stability of soil aggregates positively correlates with the SOM and clay minerals (Tisdall and Oades 1982;Six et al 2004). There was also found a positive relationship between the stability of soil aggregates, cation exchange capacity (CEC), and the content of humic substances (Oades 1984;Six et al 2002;von Lützow et al 2006;Bartlová et al 2015). The stability and size distribution of soil aggregates is also affected by land use (Zhao et al 2017) and rate of decay of macro-and microaggregate is highly influenced by the intensity of tillage (Al-Kaisi et al 2014).…”

Section: Introductionmentioning

confidence: 96%

Humic substances and aggregate stability in rhizospheric and non-rhizospheric soil

Kobierski

Kondratowicz-Maciejewska

Banach-Szott

et al. 2018

J Soils Sediments

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Purpose The paper describes rhizospheric (Rs) and non-rhizospheric (nRs) soil to demonstrate the zone of the plant root impact on physical and chemical properties of the soil. The effects of the process accompanying the transformations of organic matter into humic substances in the rhizosphere of Bcommon dandelion^Taraxacum officinale have been determined, and the properties of humic acids (HAs) were described. The importance of iron and clay minerals for the formation of a stable and water-resistant soil structure has been emphasized. Materials and methods The laboratory analysis involved determination of basic physical and chemical soil properties: texture, pH, cation exchange capacity (CEC), electrical conductivity, and content of total organic carbon (TOC) and dissolved organic carbon (DOC) and quality of humic substances: optical properties of HAs and its separation into hydrophilic (HIL) and hydrophobic (HOB) fractions, speciation of iron, glomalin operationally described as an easily extractable glomalin-related soil protein (EE-GRSP), and soil aggregate stability (SAS) of six size classes of soil aggregates. Results and discussion The Rs was reported with a higher TOC and DOC content (measured in the CaCl 2 extracts), however not significantly. The HAs isolated from Rs revealed a significantly higher content of humic substances at its initial decomposition stage, as compared with nRs. A significantly higher concentration of EE-GRSP was noted in the aggregates of the rhizospheric zone (mean 1.14 g kg −1 ) than in the aggregates collected from root-free soil (mean 0.94 g kg −1 ). There was noted the highest mean share of 1-3 mm soil aggregates in Rs as well as in nRs, respectively 44.4 and 38.3%. The soil material both in Rs and in nRs contained high amounts of exchangeable Ca 2+ , and smectite is the predominant clay mineral. It was favorable for the accumulation of organic carbon and for the formation of good soil physical condition (tilth). Higher but insignificant SAS values were observed for Rs (mean SAS = 95.6%) than for nRs (mean SAS = 93.9%). Conclusions The studies confirm the role of common dandelion roots in the process of organic carbon accumulation in rhizospheric zone and a favorable effect on the mechanism of the formation of water-resistant aggregates. Higher values of SAS for the Rs were affected by the content of TOC, DOC, exchangeable Ca 2+ and the concentration of EE-GRSP, and, less considerably, the content of Fe and clay minerals.

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“…The positive influence of stabile components of SOM (like humus substances) on the quality of soil and soil aggregates is evident (Bartlová et al 2015). However, according to Yang et al (2012), the labile pools of carbon also significantly affect the quality of soil and moreover they can be used to monitor the changes in SOM in a shorter time period.…”

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confidence: 99%

Labile forms of carbon and soil aggregates

Tobiašová¹,

Barančíková²,

Gömöryová³

et al. 2016

Soil & Water Res.

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Tobiašová E., Barančíková G., Gömöryová E., Makovníková J., Skalský R., Halas J., Koco Š., Tarasovičová Z., Takáč J., Špaňo M. Soil organic matter (SOM) plays an important role in the soil aggregation and vice versa, its incorporation into the soil aggregates is one of the mechanisms of soil organic carbon stabilization. In this study the influence of labile carbon fractions on the fractions of dry-sieved (DSA) and wet-sieved (WSA) macro-aggregates and the relationship between the content of total organic carbon (TOC) and its labile fractions in the soil and in the fractions of macro-aggregates were determined. The experiment included six soil types (Eutric Fluvisol, Mollic Fluvisol, Haplic Chernozem, Haplic Luvisol, Eutric Cambisol, Rendzic Leptosol) in four ecosystems (forest, meadow, urban, and agro-ecosystem). In the case of DSA, the contents of labile fractions of carbon, in particular cold water extractable organic carbon (CWEOC) and hot water extractable organic carbon (HWEOC), had a higher impact on the proportions of larger fractions of macro-aggregates (3-7 mm), while in the case of WSA, the impact of labile fractions of carbon, mainly labile carbon (C L ) oxidizable with KMnO 4 , was higher on the proportions of smaller fractions of aggregates (0.25-1 mm). The WSA size fraction of 0.5-1 mm seems an important indicator of changes in the ecosystems and its amounts were in a negative correlation with C L (r = -0.317; P < 0.05) and HWEOC (r = -0.356; P < 0.05). In the WSA and DSA size fractions 0.5-1 mm, the highest variability in the contents of TOC and C L was recorded in the forest ecosystem > meadow ecosystem > urban ecosystem > agro-ecosystem. The higher were the inputs of organic substances into the soil, the greater was the variability in their incorporation into the soil aggregates. The influence of the content of TOC and its labile forms on their contents in the DSA and WSA was different, and the contents of TOC and C L in the aggregates were more significantly affected by the C L content than by water soluble carbon. In the case of WSA fractions, their carbon content was more affected in the 1-2 mm than in 0.5-1 mm fraction.

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Water stability of soil aggregates in different systems of tillage

Cited by 48 publications

References 34 publications

Increasingly Important Role of Atmospheric Aridity on Tibetan Alpine Grasslands

Increasingly Important Role of Atmospheric Aridity on Tibetan Alpine Grasslands

Humic substances and aggregate stability in rhizospheric and non-rhizospheric soil

Labile forms of carbon and soil aggregates

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