Spatial patterns of, and environmental controls on, soil properties at a riparian-paddock interface

M. Smith, P. Conte, A.E. Berns, Jim THOMSON, Cavagnaro Cavagnaro

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Riparian zones are prominent features of agricultural landscapes because they are the last point to intercept nutrients and sediments before they enter water bodies. We investigated the soil properties, nutrient dynamics and vegetation composition at the riparian-agriculture interface. Soil physicochemical and vegetation properties were spatially heterogeneous along the transition from the grazed paddock into the un-grazed and revegetated riparian zone. Soil C stocks varied considerably across the site, with values ranging from 2% in the paddock to 5% in the riparian zone. Using Bayesian model selection, a predictive model for total soil carbon was developed. By including soil moisture content and canopy cover in the model, it was possible to predict total soil carbon with 80% accuracy at the site level and 87% at the transect level. This opens up the potential for total soil carbon levels to be estimated by the quantification of easily measured ecosystem properties. Analysis of the chemical nature of the carbon in theses soils by solid state 13C NMR spectroscopy, showed the presence of more recalcitrant forms of carbon in the revegetated riparian zone compared to the grazed paddock. Spatial patterns of soil mineral N pools were highly variable (NO4+-N ranged from 1 to 5 µg/g dry soil; NO3--N ranged from 0.4 to 2.2 µg/g dry soil); however, clear patterns in potentially mineralizable N (PMN) were observed, with rates of PMN in the paddock being less than half of those adjacent to the stream in the riparian zone. Results are discussed in the context of the dynamic nature of soil processes at the agriculture - riparian interface, and the potential to develop models to predict soil carbon using easily measurable vegetation and soil properties.
Original languageEnglish
Pages (from-to)38-45
Number of pages8
JournalSoil Biology and Biochemistry
Volume49
DOIs
Publication statusPublished - 2012
Externally publishedYes

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riparian zone
soil properties
soil property
Soil
pastures
soil carbon
riparian areas
soil
carbon
Carbon
vegetation
agriculture
nutrient dynamics
nuclear magnetic resonance
environmental control
Agriculture
moisture content
transect
agricultural land
soil moisture

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Smith, M. ; Conte, P. ; Berns, A.E. ; THOMSON, Jim ; Cavagnaro, Cavagnaro. / Spatial patterns of, and environmental controls on, soil properties at a riparian-paddock interface. In: Soil Biology and Biochemistry. 2012 ; Vol. 49. pp. 38-45.
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abstract = "Riparian zones are prominent features of agricultural landscapes because they are the last point to intercept nutrients and sediments before they enter water bodies. We investigated the soil properties, nutrient dynamics and vegetation composition at the riparian-agriculture interface. Soil physicochemical and vegetation properties were spatially heterogeneous along the transition from the grazed paddock into the un-grazed and revegetated riparian zone. Soil C stocks varied considerably across the site, with values ranging from 2{\%} in the paddock to 5{\%} in the riparian zone. Using Bayesian model selection, a predictive model for total soil carbon was developed. By including soil moisture content and canopy cover in the model, it was possible to predict total soil carbon with 80{\%} accuracy at the site level and 87{\%} at the transect level. This opens up the potential for total soil carbon levels to be estimated by the quantification of easily measured ecosystem properties. Analysis of the chemical nature of the carbon in theses soils by solid state 13C NMR spectroscopy, showed the presence of more recalcitrant forms of carbon in the revegetated riparian zone compared to the grazed paddock. Spatial patterns of soil mineral N pools were highly variable (NO4+-N ranged from 1 to 5 µg/g dry soil; NO3--N ranged from 0.4 to 2.2 µg/g dry soil); however, clear patterns in potentially mineralizable N (PMN) were observed, with rates of PMN in the paddock being less than half of those adjacent to the stream in the riparian zone. Results are discussed in the context of the dynamic nature of soil processes at the agriculture - riparian interface, and the potential to develop models to predict soil carbon using easily measurable vegetation and soil properties.",
keywords = "Bayesian modelling, Nitrogen cycling, Nuclear magnetic resonance spectroscopy (NMR), Riparian restoration, Soil carbon, Soil nutrients, Soil respiration.",
author = "M. Smith and P. Conte and A.E. Berns and Jim THOMSON and Cavagnaro Cavagnaro",
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Spatial patterns of, and environmental controls on, soil properties at a riparian-paddock interface. / Smith, M.; Conte, P.; Berns, A.E.; THOMSON, Jim; Cavagnaro, Cavagnaro.

In: Soil Biology and Biochemistry, Vol. 49, 2012, p. 38-45.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spatial patterns of, and environmental controls on, soil properties at a riparian-paddock interface

AU - Smith, M.

AU - Conte, P.

AU - Berns, A.E.

AU - THOMSON, Jim

AU - Cavagnaro, Cavagnaro

PY - 2012

Y1 - 2012

N2 - Riparian zones are prominent features of agricultural landscapes because they are the last point to intercept nutrients and sediments before they enter water bodies. We investigated the soil properties, nutrient dynamics and vegetation composition at the riparian-agriculture interface. Soil physicochemical and vegetation properties were spatially heterogeneous along the transition from the grazed paddock into the un-grazed and revegetated riparian zone. Soil C stocks varied considerably across the site, with values ranging from 2% in the paddock to 5% in the riparian zone. Using Bayesian model selection, a predictive model for total soil carbon was developed. By including soil moisture content and canopy cover in the model, it was possible to predict total soil carbon with 80% accuracy at the site level and 87% at the transect level. This opens up the potential for total soil carbon levels to be estimated by the quantification of easily measured ecosystem properties. Analysis of the chemical nature of the carbon in theses soils by solid state 13C NMR spectroscopy, showed the presence of more recalcitrant forms of carbon in the revegetated riparian zone compared to the grazed paddock. Spatial patterns of soil mineral N pools were highly variable (NO4+-N ranged from 1 to 5 µg/g dry soil; NO3--N ranged from 0.4 to 2.2 µg/g dry soil); however, clear patterns in potentially mineralizable N (PMN) were observed, with rates of PMN in the paddock being less than half of those adjacent to the stream in the riparian zone. Results are discussed in the context of the dynamic nature of soil processes at the agriculture - riparian interface, and the potential to develop models to predict soil carbon using easily measurable vegetation and soil properties.

AB - Riparian zones are prominent features of agricultural landscapes because they are the last point to intercept nutrients and sediments before they enter water bodies. We investigated the soil properties, nutrient dynamics and vegetation composition at the riparian-agriculture interface. Soil physicochemical and vegetation properties were spatially heterogeneous along the transition from the grazed paddock into the un-grazed and revegetated riparian zone. Soil C stocks varied considerably across the site, with values ranging from 2% in the paddock to 5% in the riparian zone. Using Bayesian model selection, a predictive model for total soil carbon was developed. By including soil moisture content and canopy cover in the model, it was possible to predict total soil carbon with 80% accuracy at the site level and 87% at the transect level. This opens up the potential for total soil carbon levels to be estimated by the quantification of easily measured ecosystem properties. Analysis of the chemical nature of the carbon in theses soils by solid state 13C NMR spectroscopy, showed the presence of more recalcitrant forms of carbon in the revegetated riparian zone compared to the grazed paddock. Spatial patterns of soil mineral N pools were highly variable (NO4+-N ranged from 1 to 5 µg/g dry soil; NO3--N ranged from 0.4 to 2.2 µg/g dry soil); however, clear patterns in potentially mineralizable N (PMN) were observed, with rates of PMN in the paddock being less than half of those adjacent to the stream in the riparian zone. Results are discussed in the context of the dynamic nature of soil processes at the agriculture - riparian interface, and the potential to develop models to predict soil carbon using easily measurable vegetation and soil properties.

KW - Bayesian modelling

KW - Nitrogen cycling

KW - Nuclear magnetic resonance spectroscopy (NMR)

KW - Riparian restoration

KW - Soil carbon

KW - Soil nutrients

KW - Soil respiration.

U2 - 10.1016/j.soilbio.2012.02.007

DO - 10.1016/j.soilbio.2012.02.007

M3 - Article

VL - 49

SP - 38

EP - 45

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

ER -