Plant Root Contributions to Carbon Sequestration on the Northern Tablelands of New South Wales, Australia

Title
Plant Root Contributions to Carbon Sequestration on the Northern Tablelands of New South Wales, Australia
Publication Date
2013
Author(s)
Olupot, Giregon
Wilson, Brian
( supervisor )
OrcID: https://orcid.org/0000-0002-7983-0909
Email: bwilson7@une.edu.au
UNE Id une-id:bwilson7
Kristiansen, Paul
( supervisor )
OrcID: https://orcid.org/0000-0003-2116-0663
Email: pkristi2@une.edu.au
UNE Id une-id:pkristi2
Lockwood, Peter
McLeod, Malem
McHenry, Melinda
Type of document
Thesis Doctoral
Language
en
Entity Type
Publication
UNE publication id
une:13845
Abstract
Root contributions to the soil carbon (C) budget vary depending on botanical composition, land-use and management, soil characteristics and prevailing environmental and climatic conditions. How these factors interact to influence the distribution of C and nitrogen (N) stocks with soil depth is not well understood. A two-phased study was conducted to evaluate root contributions to depth distribution of C and N stocks in an Alfisol on the Northern Tablelands of New South Wales (NSW), Australia. Phase 1 evaluated the impact of land-use on: (i) distribution of fine root biomass and associated root functional traits to a maximum depth of 1.0 m, (ii) accumulation of root and soil C and N stocks within the 1.0 m soil profile in relation to the root traits investigated and (iii) decomposability of root litters from improved pastures, native pastures and woodlands. In phase II, a one-year field experiment was conducted to address objectives (i) to (iii) above under three native grasses of NSW: 'Austrodanthonia richardsonii' (C3 sun-adapted), 'Chloris ventricosa' (C4 sun-adapted) and 'Microlaena stipoides' (C3 shade-adapted) across growing seasons at 0% and 75% shading.
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