The Effect of Contrasting Moistening Regimes on CO2 Emission from the Gray Forest Soil under a Grass Vegetation and Bare Fallow

Gerenyu, V. O. Lopes de; Kurganova, I. N.; Khoroshaev, Dmitry

doi:10.1134/s1064229318100034

Cited by 10 publications

(3 citation statements)

References 42 publications

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“…Intimately tied to wetting and drying, the Birch effect was first described in 1958 as an initially very rapid phase of respiration occurring immediately after the wetting of dried soil [152]. This phenomenon has been extensively reported across a range of soils, climate zones, and land uses, both in field experiments [153,154] and laboratory incubations [155,156], with Birch effect-derived pulses potentially accounting for two-thirds of the soil respiration in a savanna ecosystem [157]. However, only a fraction of the reports of the Birch Effect include experiments and analyses designed to elucidate that underlying controls on this enhanced CO 2 flush (e.g.…”

Section: Birch Effectmentioning

confidence: 99%

What do we know about soil carbon destabilization?

Bailey

Pries

Lajtha

2019

Environ. Res. Lett.

145

106

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Most empirical and modeling research on soil carbon (C) dynamics has focused on those processes that control and promote C stabilization. However, we lack a strong, generalizable understanding of the mechanisms through which soil organic carbon (SOC) is destabilized in soils. Yet a clear understanding of C destabilization processes in soil is needed to quantify the feedbacks of the soil C cycle to the Earth system. Destabilization includes processes that occur along a spectrum through which SOC shifts from a ‘protected’ state to an ‘available’ state to microbial cells where it can be mineralized to gaseous forms or to soluble forms that are then lost from the soil system. These processes fall into three general categories: (1) release from physical occlusion through processes such as tillage, bioturbation, or freeze-thaw and wetting-drying cycles; (2) C desorption from soil solids and colloids; and (3) increased C metabolism. Many processes that stabilize soil C can also destabilize C, and C gain or loss depends on the balance between competing reactions. For example, earthworms may both destabilize C through aggregate destruction, but may also create new aggregates and redistribute C into mineral horizon. Similarly, mycorrhizae and roots form new soil C but may also destabilize old soil C through priming and promoting microbial mining; labile C inputs cause C stabilization through increased carbon use efficiency or may fuel priming. Changes to the soil environment that affect the solubility of minerals or change the relative surfaces charges of minerals can destabilize SOC, including increased pH or in the reductive dissolution of Fe-bearing minerals. By considering these different physical, chemical, and biological controls as processes that contribute to soil C destabilization, we can develop thoughtful new hypotheses about the persistence and vulnerability of C in soils and make more accurate and robust predictions of soil C cycling in a changing environment.

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Section: Birch Effectmentioning

confidence: 99%

What do we know about soil carbon destabilization?

Bailey

Pries

Lajtha

2019

Environ. Res. Lett.

145

106

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“…In the light of climate change, the global temperature is projected to change (IPCC 2013) and water loss management is important to mitigate the impacts (de Gerenyu et al 2018;Michael 2019b;Pokharel et al 2020). These results showed more water is lost from the surface soil when pasture is present compared to loss from the deep soil when amended.…”

Section: Management Implicationsmentioning

confidence: 99%

Cogon grass biochar amendment and Panicum coloratum planting improve selected properties of sandy soil under humid lowland tropical climatic conditions

Michael

2020

Biochar

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Biochar amendment improves the physical, chemical and biological characteristics of different soil types under different climatic and environmental conditions. In this study, effects of biochar or live pasture plants existing alone or co-existing on selected soil properties of sandy loam soil under humid lowland tropical climatic conditions were investigated. The changes measured in the amended soil, with or without plants, were compared to the unamended and unplanted soils. Biochar amendment with or without pasture improved moisture retention, lowered bulk density, increased pH and kept the electrical conductivity within ranges conducive for pasture growth. Generally, contents of all the nutrients increased following biochar amendment, however pasture establishment without amendment resulted in depletion of available potassium and magnesium. Under all treatment conditions, soil organic carbon and soil organic matter were significantly depleted. Cogon grass is invasive under all land use systems and contributes to greenhouse gas emissions through slash-and-burn. Using biomass from the grass instead of burning would mitigate CO 2 emissions from the tropics.

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“…However, there is still no consensus on its biospheric significance (Moyano et al 2013;Oikawa et al 2014). The one-time contribution of the additional emission caused by this effect can be very noticeable, especially after prolonged droughts (Karelin et al 2017), although the overall reduction of soil respiration caused by drought significantly negates this contribution (Lopes de Gerenyu et al 2018). The winter analogue of such «wetting-drying» cycles can probably be considered sporadic «freezing-thawing» cycles, which also cause a substantial pulse release of CO 2 (Kurganova and Lopes de Gerenyu 2015).…”

Section: Introductionmentioning

confidence: 99%

Contribution Analysis Of Permanent And Sporadic Controls Of Co2 Efflux From Chernozems Over Four Seasons

Карелин

Суховеева

2021

GES

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We analyzed four years field observations (2017–2020) of soil CO2 efflux from Chernozems of arable and foreststeppe ecosystems of Kursk region (Russia), which correspond to the period of the maximal current warming. Three wellknown simulation models of different structure and variable sets (DNDC, RothC, T&P) and nonparametric regression analysis were used to estimate annual CO2 emission from soil and contributions of constant and sporadic controls. The applied models satisfactorily predict both the rate of annual soil CO2 emission and its seasonal dynamics on arable Chernozems. However, while RothC is suitable for the whole set of crops considered, DNDC is most suitable for cereals and T&R for bare soils only. A comparison of the contributions of permanent and sporadic factors to soil respiration showed that on an inter-annual scale soil temperature and moisture are less important than yearly crop rotation in Chernozem plowlands, making the latter the most important predictor apart from general land-use type. Although the combination of significant permanent and sporadic factors is able to explain 41% of the soil CO2 emission variance, the leading involvement of spatial controls prevents the construction of quantitative regression models that are able to make forecasts, requiring the use of more sophisticated simulation models (i.e. RothC) in this case. However, the use of the latter does not yet solve the problem of predicting soil CO2 emission and its net balance in forest-covered or steppe areas of Chernozem forest-steppe landscape.

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The Effect of Contrasting Moistening Regimes on CO2 Emission from the Gray Forest Soil under a Grass Vegetation and Bare Fallow

Cited by 10 publications

References 42 publications

What do we know about soil carbon destabilization?

What do we know about soil carbon destabilization?

Cogon grass biochar amendment and Panicum coloratum planting improve selected properties of sandy soil under humid lowland tropical climatic conditions

Contribution Analysis Of Permanent And Sporadic Controls Of Co2 Efflux From Chernozems Over Four Seasons

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