The Characterization of Slope Positions and Their Influence on the Total Nitrogen Content of a Few Virgin Soils of Western Iowa

Aandahl, Andrew R.

doi:10.2136/sssaj1949.036159950013000c0081x

Cited by 107 publications

(48 citation statements)

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“…The standard hillslope/catena model suggests that N storage and availability should increase downslope: erosion is generally highest among upslope positions, resulting in transport of soluble and particulate N to depositional-footslope positions, a pattern observed for several grassland catena sites (Aandahl, 1948;Schimel et al, 1985). A number of sites developing on N-rich lithologies have exhibited more complex or even opposite trends, however -pointing to potential rock N inputs to soil landscapes.…”

Section: Topographymentioning

confidence: 99%

A new synthesis for terrestrial nitrogen inputs

Houlton

Morford

2015

SOIL

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Abstract. Nitrogen (N) inputs sustain many different aspects of local soil processes, their services, and their interactions with the broader Earth system. We present a new synthesis for terrestrial N inputs that explicitly considers both rock and atmospheric sources of N. We review evidence for state-factor regulation over biological fixation, deposition, and rock-weathering inputs from local to global scales and in transient vs. steady-state landscapes. Our investigation highlights strong organism and topographic (relief) controls over all three N input pathways, with the anthropogenic factor clearly important in rising N deposition rates. In addition, the climate, parent material, and time factors are shown to influence patterns of fixation and rock-weathering inputs of N in diverse soil systems. Data reanalysis suggests that weathering of N-rich parent material could resolve several known cases of "missing N inputs" in ecosystems, and demonstrates how the inclusion of rock N sources into modern concepts can lead to a richer understanding of spatial and temporal patterns of ecosystem N availability. For example, explicit consideration of rock N inputs into classic pedogenic models (e.g., the Walker and Syers model) yields a fundamentally different expectation from the standard case: weathering of N-rich parent material could enhance N availability and facilitate terrestrial succession in developmentally young sites even in the absence of N-fixing organisms. We conclude that a state-factor framework for N complements our growing understanding multiple-source controls on phosphorus and cation availability in Earth's soil, but with significant exceptions given the lack of an N fixation analogue in all other biogeochemical cycles. Rather, non-symmetrical feedbacks among input pathways in which high N inputs via deposition or rock-weathering sources have the potential to reduce biological fixation rates mark N as fundamentally different from other nutrients. The new synthesis for terrestrial N inputs provides a novel set of research issues and opportunities in the multidisciplinary Earth system sciences, with implications for patterns of N limitation, tectonic controls over biogeochemical cycling, and carbon-nutrient-climate interactions.

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Section: Topographymentioning

confidence: 99%

A new synthesis for terrestrial nitrogen inputs

Houlton

Morford

2015

SOIL

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“…However, landscape position and land use may be the dominant factors of soil properties under a hillslope and small catchment scale. Landscape positions influence runoff, drainage, soil temperature, and soil erosion and consequently soil formation (Aandahl, 1948). Differences in soil formation along a hillslope result in differences in soil properties (Brubaker et al, 1993), which can affect pattern of plant production, litter production and decomposition.…”

Section: Introductionmentioning

confidence: 99%

Soil nutrients in relation to land use and landscape position in the semi-arid small catchment on the loess plateau in China

Wang

Yang

et al. 2001

Journal of Arid Environments

247

115

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“…These factors include lithology, soil texture, and soil microclimate (Jenny 1941;Aandahl 1948;Malo et al 1974;Schimel et al 1985aSchimel et al , 1985bPastor et al 1984;Gosz & White 1986;Zak 1986;Burke 1989). Topographic variation in abiotic factors creates landscape patterns that change slowly as ecosystem properties such as community structure and organic matter quantity and quality respond to erosion, weathering and climate.…”

Section: Introductionmentioning

confidence: 99%

Organic matter turnover in a sagebrush steppe landscape

1989

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Abstract. Laboratory incubations of 15N-amended soils from a sagebrush steppe in southcentral Wyoming indicate that nutrient turnover and availability have complex patterns across the landscape and between microsites. Total and available N and P and microbial C and N were highest in topographic depressions characterized by tall shrub communities. Net and gross N mineralization rates and respiration were also highest in these areas, but microbial efficiencies expressing growth relative to respiration cost were highest in soils of exposed ridgetop sites (prostrate shrub communities). Similar patterns occurred between shrub and intershrub soils, with greater nutrient availability under shrubs, but lower microbial efficiencies under shrubs than between. Surface soils had higher soil nutrient pools and N mineralization rates than subsurface soils, but N and C turnover and microbial efficiencies were lower in those surface soils. All soils decreased in respiration, mineralization, and immobilization rates during the 30-day incubation period, apparently approaching a steady-state substrate use. Soil microbial activity of the high organic matter accumulation areas was apparently more limited by labile substrate.

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The Characterization of Slope Positions and Their Influence on the Total Nitrogen Content of a Few Virgin Soils of Western Iowa

Cited by 107 publications

References 0 publications

A new synthesis for terrestrial nitrogen inputs

A new synthesis for terrestrial nitrogen inputs

Soil nutrients in relation to land use and landscape position in the semi-arid small catchment on the loess plateau in China

Organic matter turnover in a sagebrush steppe landscape

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