The soil production function: A brief history and its rediscovery

Humphreys, Geoff S.; Wilkinson, Marshall T.

doi:10.1016/j.geoderma.2007.01.004

Cited by 103 publications

(65 citation statements)

References 34 publications

(31 reference statements)

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“…As a result, soil thickness generally also increases (see e.g. Humphreys and Wilkinson, 2007;Sauer, 2010). The increase is in most cases not linear, as soil production has to counter-balance chemical and physical weathering losses (e.g.…”

Section: Discussionmentioning

confidence: 99%

Soil organic carbon and nitrogen accumulation rates in cold and alpine environments over 1Ma

Egli

Favilli²,

Krebs

et al. 2012

Geoderma

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Using published and new chronosequence datasets from the European Alps and the Wind River Range (Rocky Mountains, USA), we report for the first time a chronosequence of more than 1 Ma for soil organic carbon, nitrogen and organic matter (SOM) fractions from alpine soils. The investigated parameters include total carbon and nitrogen as well as the stable (resistant to HO oxidation) C and N fractions. Time trends were analysed and are reported on the basis of stocks and concentrations. The accumulation rates of C and N strongly decreased with increasing soil age. Differences in trends between the European Alps and the Wind River Range might be attributed to the factor climate. For the drier Wind River Range, an asymptotic value of about 15 kg C m² was reached after about 15 ky while an asymptotic value of 20-25 kg C m² was measured for the moister European Alps after about 3 ky. The difference in N stocks between the two regions was less obvious. For both areas, N was in the range of 0.5-2kgN m². Using the exponential decay model, a steady state of C and N (stable and total) concentrations in the topsoil seemed to be reached after b1 ky (Alps) and 10 ky (Wind River Range). The retardation effect observed for the Wind River Range could probably be due to aeolian influx. For both areas, the asymptotic value of the stable fraction of C and N was in the range of 1-3 kg C m² and 0.2-0.4 kg N m², respectively. The stable organic fraction often has an age close to the age of the soils and consequently can reach thousands of years. The relative proportion of N and amides was higher in the stable organic fraction compared to the bulk soil. The sequestration rates of org. C and N in soils of the European Alps and the Wind River Range can reach very high values in very young soils whereas in old soils sequestration rates are several orders of magnitude lower. Old soils often integrate several cold and warm phases and different vegetation types. Nonetheless, the factor Time seems to be very dominant and covers the track of other factors in old soils. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 -2 -regions was less obvious. For both areas, N was in the range of 0.5-2 kg N m -2 . Using the exponential decay model, a steady state of C and N (stable and total) concentrations in the topsoil seemed to be reached after <1ky (Alps) and 10 ky (Wind River Range). The retardation effect observed for the Wind River Range could probably be due to aeolian influx. For both areas, the asymptotic value of the stable fraction of C and N was in the range of 1-3 kg C m -2 and 0.2-0.4 kg N m -2 , respectively. The stable organic fraction often has an age close to the age of the soils and consequently can reach thousands of years. The relative proportion of N and amides was higher in the stable organic fraction compared to the bulk s...

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Section: Discussionmentioning

confidence: 99%

Soil organic carbon and nitrogen accumulation rates in cold and alpine environments over 1Ma

Egli

Favilli²,

Krebs

et al. 2012

Geoderma

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“…In their mARM3D model Cohen et al (2010) used two depth-dependent weathering functions (Fig. 3), (1) exponential decline (called exponential) (Humphreys and Wilkinson, 2007) and (2) humped exponential decline (called humped) (Ahnert, 1977;Minasny and McBratney, 2006). For the exponential, the weathering rate declines exponentially with depth.…”

Section: Soil Profile Development Through Depth-dependent Weatheringmentioning

confidence: 99%

Exploring the sensitivity on a soil area-slope-grading relationship to changes in process parameters using a pedogenesis model

et al. 2016

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Abstract. This paper generalises the physical dependence of the relationship between contributing area, local slope, and the surface soil grading using a pedogenesis model and allows an exploration of soilscape selforganisation. A parametric study was carried out using different parent materials, erosion, and weathering mechanisms. These simulations confirmed the generality of the area-slope-d 50 relationship. The relationship is also true for other statistics of soil grading (e.g. d 10 ,d 90 ) and robust for different depths within the profile. For small area-slope regimes (i.e. hillslopes with small areas and/or slopes) only the smallest particles can be mobilised by erosion and the area-slope-d 50 relationship appears to reflect the erosion model and its Shield's Stress threshold. For higher area-slope regimes, total mobilization of the entire soil grading occurs and self-organisation reflects the relative entrainment of different size fractions. Occasionally the interaction between the in-profile weathering and surface erosion draws the bedrock to the surface and forms a bedrock outcrop. The study also shows the influence on different depth-dependent in-profile weathering functions in the formation of the equilibrium soil profile and the grading characteristics of the soil within the profile. We outline the potential of this new model and its ability to numerically explore soil and landscape properties.

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“…Thus, in the brown forest dark humus soils in the mountain forest belt and the transition sub-belt of park open forest (cross sections 15,17,19) there are more crystallized forms of iron compounds than amorphous. In brown forest clayey illuviated soil (crosssection 26) in the lower border of the mountain-forest belt, the content of amorphous iron is slightly higher than that of crystallized, with a maximum in structural and metamorphic profile horizons.…”

Section: Ao-ay-ay El -Bm El -Bm-clm)mentioning

confidence: 99%

“…It is also natural that soils differ in different mountains depending on their location, height, composition of the material, etc. [4,5,[9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Genetic Characteristics of Brown Forest Soils on the Middle Urals

Iraida¹

2015

AJEP

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Abstract:Feature of mountain soil formation is that the soils on the mountain slopes are formed in different bioclimatic and orogeomorfological conditions. The purpose of research is to study genetic properties of the brown forest soils in the Middle Urals. Features of the morphological structure: truncated profile (35-75 cm), weakly expressed in the differentiation of the soil profile into individual Horizons, detritus (20-65%), loamy fine earth, the signs of podzolization in the soil profile is not found. Feature granulometric size distribution of the soil -a gradual increase in weight on the profile into Sandy Loam to Silty Clay and Clay, the dominant factions are either big Silt or Sand. Soils are characterized by a very acidic environment and high hydrolytic acidity. The soils are enriched in organic matter and humus profile characterized by prolixity. Group composition humus shows mobility, high degree of humification of organic substances to fulvic acids. Gross composition shows that the processes of soil formation on Mount, North Basegi aren't leading to a distinctly different profile. Coefficients of geochemical accumulation, subsurface weathering, eluviation, oxidation calculated and helped define the features of the gross composition of soils. Character of distribution in profile and correlation of forms of iron help to diagnose physical processes of weathering and soil formation (burozemic pedogenesis et al.); signs Podzolization not revealed. Weathering and soil formation processes that occur with varying intensity, creating a diversity of soil cover and the spatial heterogeneity of soils, even within the same type.

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The soil production function: A brief history and its rediscovery

Cited by 103 publications

References 34 publications

Soil organic carbon and nitrogen accumulation rates in cold and alpine environments over 1Ma

Soil organic carbon and nitrogen accumulation rates in cold and alpine environments over 1Ma

Exploring the sensitivity on a soil area-slope-grading relationship to changes in process parameters using a pedogenesis model

Genetic Characteristics of Brown Forest Soils on the Middle Urals

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