Fine Root Biomass and Its Relationship to Evapotranspiration in Woody and Grassy Vegetation Covers for Ecological Restoration of Waste Storage and Mining Landscapes

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Show simple item record Yunusa, IAM Zolfaghar, S Zeppel, MJB Li, Z Palmer, AR Eamus, D 2012-10-12T03:33:17Z 2012-01
dc.identifier.citation Ecosystems, 2012, 15 (1), pp. 113 - 127
dc.identifier.issn 1432-9840
dc.identifier.other C1 en_US
dc.description.abstract Production and distribution of fine roots (≤2.0 mm diameter) are central to belowground ecological processes. This is especially true where vegetation serves as a pump to prevent saturation of soil and possible drainage of excess water into or from potentially toxic waste material stored underground or in mounds aboveground. In this study undertaken near Sydney in Australia, we determined fine root biomass and evapotranspiration (ET) on a waste disposal site restored with either a 15-year-old grass sward or plantations of mixed woody species that were either 5 years old (plantation-5) with a vigorous groundcover of pasture legumes and grasses, or 3 years old (plantation-3) with sparse groundcover. These sites were compared with nearby remnant woodland; all four were located within 0.5-km radius at the same site. Ranking of fine root biomass was in the order woodland (12.3 Mg ha -1) > plantation-5 (8.3 Mg ha -1) > grass (4.9 Mg ha -1) > plantation-3 (1.2 Mg ha -1) and was not correlated with nutrient contents in soil or plants, but reflected the form and age of the vegetation covers. Trends in root length density (RLD) and root area index (RAI) followed those in root biomass, but the differences in RAI were larger than those in biomass amongst the vegetation covers. Annual ET in the dry year of 2009 was similar in the three woody vegetation covers (652-683 mm) and was at least 15% larger than for the grass (555 mm), which experienced restrained growth in winter and periodic mowing. This resulted in drainage from the grass cover while there was no drainage from any of the woody vegetation covers. In plantation-5, root biomass, RAI and RLD were reduced in the rain shadow side of the tree rows. Similarly, the amount and depth of rooting in the groundcover were reduced close to the trees compared to midway between rows. Differences in the root variables were larger than those in ET, which suggested that more roots were produced than were needed for water uptake and/or presence of considerable amounts of necromass. We conclude that vegetation covers, such as plantation-5 consisting of widely spaced trees and a heavy groundcover containing winter-active pasture legumes, will promote year-round water-use with a reduced risk of deep rooting that could breach buried wastes. This function could be sustained through progressive thinning of trees to account for not more than 25% of the whole canopy cover; this will minimize competition for limited soil-water and thereby constrain deep rooting as vegetation ages and attains climax. © 2011 Springer Science+Business Media, LLC.
dc.language eng
dc.relation.hasversion Accepted manuscript version
dc.relation.isbasedon 10.1007/s10021-011-9496-9
dc.title Fine Root Biomass and Its Relationship to Evapotranspiration in Woody and Grassy Vegetation Covers for Ecological Restoration of Waste Storage and Mining Landscapes
dc.type Journal Article
dc.description.version Published
dc.parent Ecosystems
dc.journal.volume 1
dc.journal.volume 15
dc.journal.number 1 en_US
dc.publocation USA en_US
dc.identifier.startpage 113 en_US
dc.identifier.endpage 127 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 050102 Ecosystem Function
dc.personcode 000006
dc.personcode 030005
dc.personcode 034078
dc.personcode 995490
dc.personcode 106025
dc.personcode 108490
dc.percentage 100 en_US Ecosystem Function en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Drainage
dc.description.keywords ecological restoration
dc.description.keywords evapotranspiration
dc.description.keywords land degradation
dc.description.keywords root area index
dc.description.keywords root biomass
dc.description.keywords root length density
dc.description.keywords waste disposal
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history General (ID: 2)
utslib.collection.history School of the Environment (ID: 344)

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