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

• Published in: Soil biology & biochemistry 2012-06, Vol.49, p.38-45
• Main Authors: Smith, M., Conte, P., Berns, A.E., Thomson, J.R., Cavagnaro, T.R.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Bayesian modelling; Biochemistry and biology; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; Freshwater; Fundamental and applied biological sciences. Psychology; Nitrogen cycling; Nuclear magnetic resonance spectroscopy (NMR); Physics, chemistry, biochemistry and biology of agricultural and forest soils; Riparian restoration; Soil carbon; Soil nutrients; Soil respiration; Soil science
• ISSN: 0038-0717; 1879-3428
• DOI: 10.1016/j.soilbio.2012.02.007

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. ► This study investigated the stocks and forms of C in a restored riparian zone. ► The amount and forms of soil C changed along the sampling gradient. ► Total soil C at the site could be predicted using easily measured site properties. ► This provides a novel method for estimating soil C easily at this site. ► Riparian zones are important sites for C sequestration in agricultural landscapes.