Importance of soil organic carbon on surface soil water content variability among agricultural fields

Manns, Hida R.; Berg, Aaron

doi:10.1016/j.jhydrol.2013.11.018

Cited by 52 publications

(32 citation statements)

References 38 publications

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“…They obviously show that high SOC means high modeled soil moisture values and low SOC gives low modeled soil moisture values. This result confirms our general knowledge and previous studies (Saxton and Rawls, 2006;Manns and Berg, 2014) that increased organic content generally produces a soil with increased water holding capacity and conductivity. Thirdly, as our aim here is to discuss the impacts of SOC on soil moisture simulations, we give the differences of the two SOC data sets (HRSOM and ISRIC-NCSCD) in rightmost panel of Fig.…”

Section: The Modified Parameterizations and Testsupporting

confidence: 93%

“…Because of the thermal and hydraulic properties of SOC are very different from mineral soil, the influences of SOC on LSMs soil moisture simulation should be well considered in this area (Yang et al, 2009). On the one hand, increased organic content generally produces a soil with increased water holding capacity and conductivity, largely as a result of its influence on soil water content (Manns and Berg, 2014;Saxton and Rawls, 2006). On the other hand, organic material acts as an insulator, with low thermal conductivity and relatively high heat capacity modulating the transfer of energy down into the soil during spring and summer and out of the soil during fall and winter, further effecting soil temperature and water properties (Bonan, 1989;Lawrence et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Sun

Chen

et al. 2016

Ecological Modelling

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a b s t r a c tMost current land surface models (LSMs) show poor performance in soil water and temperature simulations for cold regions because of the inappropriate model structures and ill-parameterizations. This study aims to explore how to parameterize soil organic carbon (SOC) in term of soil moisture simulations using the Community Land Model version 4.0 (CLM4.0) model and the Dynamic Land Model version 1.0 (DLM1.0) model. Firstly, we discuss the sensitivities of modeled soil moisture to SOC based on observations. The SOC parameterizations in both CLM4.0 and DLM1.0 were proved poor against the measured SOC through sensitivity analysis for the Heihe River watershed area (cold but with high SOC). A SOC parameterization was developed and tested based on multiple year observations. Our findings are twofold: (i) the soil organic parameterizations in CLM4.0 and DLM1.0 are inappropriate for simulating soil moisture in cold regions with high SOC, and the modified SOC parameterization significantly improves the soil moisture simulations; (ii) the impacts of SOC on soil moisture vary significantly with seasons, which is largest for JJA (June, July and August) followed by SON (September, October and November), MAM (March, April and May) and DJF (December, January and February). This study highlights that the impacts of SOC should be fully considered for LSMs soil moisture simulations, especially for cold areas with high SOC.

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Section: The Modified Parameterizations and Testsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Sun

Chen

et al. 2016

Ecological Modelling

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“…The strong positive relationship between soil moisture and organic carbon has been also documented by Manns and Berg (2014).…”

Section: Resultsmentioning

confidence: 71%

Response of soil physical properties and dehydrogenase activity to contrasting tillage systems

Nugis

Edesi

Tamm

et al. 2016

Zemdirbyste-Agriculture

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The aim of this study was to compare the influence of conventional tillage (CT) and no tillage (NT) on sandy loam and loamy sand soils in three sites of Estonia: 1) Viljandi county (Gleic Albeluvisol), 2) Valga county (FragiStagnic Albeluvisol) and 3) Pärnu county (Mollic Gleysol). The dry bulk density, gravimetric water content and dehydrogenase activity of the soils were determined in the spring of 2013 and 2014. In addition, a soil density index based on soil dry bulk density differences was introduced. Soil samples were collected from 0-10 and 10-20 cm layers in spring. The no tillage treatment had higher soil dry bulk density than the conventional tillage in Gleic Albeluvisol and Mollic Gleysol, where the no tillage fields had not been ploughed for 10 and 2 years, correspondingly. The index of soil density varied between 0.289-0.511, when compared the no tillage and conventional tillage treatments the lowest values were obtained in Gleic Albeluvisol and Mollic Gleysol. Gravimetric water content was significantly lower 2-5% (p < 0.05) in the conventional than in no tillage treatments. No tillage fields showed higher soil dehydrogenase activity in the upper 0-10 cm layer, conventional tillage treatments had no significant differences between the layers. Soil dehydrogenase activity had significant positive correlation (p < 0.01) with soil gravimetric water content and organic carbon, and negative correlation (p < 0.05) with soil dry bulk density and soil density index.

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“…As with any soil, the SOM concentration in humid tropical soils is positively and approximately linearly correlated with the soil clay and silt content [30,66] and negatively correlated with the (especially coarse) sand content [67], both of which vary systematically along the soil catena. Compared to sandy soils, an increased OM content in clayey/silty soils is due to the protection of SOM decomposition via the formation of "organo-mineral complexes" [68].…”

Section: Factors Influencing Organic Matter In Soils Of the Humid Tromentioning

confidence: 89%

“…In the soil physical dimension, SOM content is negatively correlated with bulk soil density [28,29] and positively correlated both with water infiltration [29] and water retention [30,31], as well as pore volume and soil aeration [32]. In the soil chemical dimension, organic forms of nutrients dominate over inorganic forms [33] and SOM is associated with lower P-fixation [34] and reduced Al-toxicity [35] due to the organic complexation of free Al.…”

Section: Relevance Of Soil Organic Mattermentioning

confidence: 99%

Improving Farming Practices for Sustainable Soil Use in the Humid Tropics and Rainforest Ecosystem Health

et al. 2016

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Abstract:Unsustainable farming practices such as shifting cultivation and slash-and-burn agriculture in the humid tropics threaten the preservation of the rainforest and the health of the local and global environment. In weathered soils prone to cohesion in humid tropic due to low Fe and carbon content and the enormous amounts of P that can be adsorbed, sustainable soil use is heavily dependent on the availability and efficient use of nutrients. This paper reviews the literature in the field and provides some insights about sustainable soil use in the humid tropics, mainly for the Brazilian Amazonia region. Careful management of organic matter and physical and chemical indicators is necessary to enhance root growth and nutrient uptake. To improve the rootability of the arable layer, a combination of gypsum with continuous mulching to increase the labile organic matter fraction responsible for the formation of a short-lived structure important for root growth is recommended, rather than tillage. Unlike mulching, mechanical disturbance via ploughing of Amazonian soils causes very rapid and permanent soil organic matter losses and often results in permanent recompaction and land degradation or anthropic savannization; thus, it should be avoided. Unlike in other regions, like southeast Brazil, saturating the soil solely with inorganic potassium and nitrogen soluble fertilizers is not recommended. Nutrient retention in the root zone can be enhanced if nutrients are added in a slow-release form and if biologically mediated processes are used for nutrient release, as occurs in green manure. Therefore, an alternative that favors using local resources to increase the supply of nutrients and offset processes that impair the efficiency of nutrient use must be pursued.

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Importance of soil organic carbon on surface soil water content variability among agricultural fields

Cited by 52 publications

References 38 publications

Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Response of soil physical properties and dehydrogenase activity to contrasting tillage systems

Improving Farming Practices for Sustainable Soil Use in the Humid Tropics and Rainforest Ecosystem Health

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