NDLI: Modelling the Long-Term Stabilization of Carbon from Maize in a Silty Soil

Content Provider	Springer Nature Link
Author	Ludwig, B. Helfrich, M. Flessa, H.
Copyright Year	2005
Abstract	Soil organic carbon (SOC) models have been widely used to predict SOC change with changing environmental and management conditions, but the accuracy of the prediction is often open to question. Objectives were (i) to quantify the amounts of C derived from maize in soil particle size fractions and at various depths in a long-term field experiment using $^{13}$C/$^{12}$C analysis, (ii) to model changes in the organic C, and (iii) to compare measured and modelled pools of C. Maize was cultivated for 24 years on a silty Luvisol which resulted in a stock of 1.9 kg maize-derived C m$^{−2}$ (36% of the total organic C) in the Ap horizon. The storage of maize-derived C in particle size fractions of the Ap horizon decreased in the order clay (0.65 kg C m$^{−2}$) > fine and medium silt (0.43) > coarse silt (0.33) > fine sand (0.13) > medium sand (0.12) > coarse sand (0.06) and the turnover times of C$_{3}$-derived C ranged from 26 (fine sand) to 77 years (clay). The turnover times increased with increasing soil depth. We used the Rothamsted Carbon Model to model the C dynamics and tested two model approaches: model A did not have any adjustable parameters, but included the Falloon equation for the estimation of the amount of inert organic matter (IOM) and independent estimations of C inputs into the soil. The model predicted well the changes in C$_{3}$-derived C with time but overestimated the changes in maize-derived C 1.6-fold. In model B, the amounts of IOM and C inputs were optimized to match the measured C$_{3}$- and C$_{4}$-derived SOC stocks after 24 years of continuous maize. This model described the experimental data well, but the modelled annual maize C inputs (0.41 kg C m$^{−2}$ a$^{−1}$) were less than the independently estimated total input of maize litter C (0.63 kg C m$^{−2}$ a$^{−1}$) and even less than the annual straw C incorporated into the soil (0.46 kg C m$^{−2}$ a$^{−1}$). These results indicated that the prediction of the Rothamsted Carbon Model with independent parameterization served only as an approximation for this site. The total amount of organic C associated with the fraction 0–63 μm agreed well with the sum of the pools ‘microbial biomass’, ‘humified-organic matter’ and IOM of the model B. However, the amount of maize-derived C in this fraction (3.4 g kg$^{−1}$) agreed only satisfactorily with the sum of maize-derived C in the pools ‘microbial biomass’ and ‘humified organic matter’ (2.6 g kg$^{−1}$).
Starting Page	315
Ending Page	325
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	278
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	natural abundance particle size fractionation Rothamsted Carbon Model soil organic matter stable isotopes Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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