Soil organic carbon and total nitrogen under Leucaena leucocephala pastures in Queensland
Alejandro Radrizzani A B , H. Max Shelton A C , Scott A. Dalzell A and Gunnar Kirchhof A
+ Author Affiliations
- Author Affiliations
A School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Qld 4072, Australia.
B Instituto Nacional de Tecnologia Agropecuaria (INTA), Jujuy 850, 4200, Santiago del Estero, Argentina.
C Corresponding author. Email: m.shelton@uq.edu.au
Crop and Pasture Science 62(4) 337-345 https://doi.org/10.1071/CP10115
Submitted: 1 April 2010 Accepted: 18 March 2011 Published: 19 April 2011
Abstract
Soil organic carbon (OC) and total nitrogen (TN) accumulation in the top 0–0.15 m of leucaena–grass pastures were compared with native pastures and with continuously cropped land. OC and TN levels were highest under long-term leucaena–grass pasture (P < 0.05). For leucaena–grass pastures that had been established for 20, 31, and 38 years, OC accumulated at rates that exceeded those of the adjacent native grass pasture by 267, 140, and 79 kg/ha.year, respectively, while TN accumulated at rates that exceeded those of the native grass pastures by 16.7, 10.8, and 14.0 kg/ha.year, respectively. At a site where 14-year-old leucaena–grass pasture was adjacent to continuously cropped land, there were benefits in OC accumulation of 762 kg/ha.year and in TN accumulation of 61.9 kg/ha.year associated with the establishment of leucaena–grass pastures. Similar C : N ratios (range 12.7–14.5) of soil OC in leucaena and grass-only pastures indicated that plant-available N limited soil OC accumulation in pure grass swards. Higher OC accumulation occurred near leucaena hedgerows than in the middle of the inter-row in most leucaena–grass pastures.
Rates of C sequestration were compared with simple models of greenhouse gas (GHG) emissions from the grazed pastures. The amount of carbon dioxide equivalent (CO2-e) accumulated in additional topsoil OC of leucaena–grass pastures ≤20 years old offset estimates of the amount of CO2-e emitted in methane and nitrous oxide from beef cattle grazing these pastures, thus giving positive GHG balances. Less productive, aging leucaena pastures >20 years old had negative GHG balances; lower additional topsoil OC accumulation rates compared with native grass pastures failed to offset animal emissions.
Additional keywords: carbon balance, carbon sequestration, greenhouse gas balance, permanent pastures, soil organic carbon, soil total nitrogen.
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