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dc.contributor.authorGuo, Lanbin Ben
dc.contributor.authorCowie, Annetteen
dc.contributor.authorMontagu, Kelvin Den
dc.contributor.authorGifford, Roger Men
dc.identifier.citationAgriculture, Ecosystems & Environment, 124(3-4), p. 205-218en
dc.description.abstractConversion of pastures to plantation forests has been proposed as a means to increase rates of carbon (C) sequestration from the atmosphere thereby reducing net greenhouse gas emissions from human activities. However, several studies have indicated that soil C stocks decrease after planting conifer (mainly pine) trees into pasture. This loss of soil C detracts from the role that plantation forests can play in net C sequestration. Here, we used a paired site (a grazed native pasture with the C₄ grass 'Themeda triandra' dominant, and an adjacent 16-year-old 'Pinus radiata' plantation) to compare all C and nitrogen (N) pools (including soil, litter on the floor, below-ground and above-ground biomass) in the two ecosystems and to estimate the rate of C sequestration after the land use change from the native pasture to the pine plantation. Soil C and N stocks from soil surface down to 1 m under the pine plantation were significantly less than under the native pasture by 20% (57.3 Mg C ha⁻¹ vs. 71.6 Mg C ha⁻¹) and 15% (5.6 Mg N ha⁻¹ vs. 6.7 Mg N ha⁻¹), respectively. Much more C and N was stored in litter on the floor in the pine plantation than in the native pasture (8.0 Mg C ha⁻¹ vs. 0.03 Mg C ha⁻¹, and 119.0 kg N ha⁻¹ vs. 0.9 kg N ha⁻¹), and in biomass (95.0 Mg C ha⁻¹ vs. 2.5 Mg C ha⁻¹ and 411.5 kg N ha⁻¹ vs. 62.8 kg N ha⁻¹). Carbon stored in coarse tree roots was alone sufficient to compensate the C loss from soil after the land use change. Much more C and N was deposited annually to above-ground litter in the pine plantation than in the native pasture (2.18 Mg C ha⁻¹ year⁻¹ vs. 0.22 Mg C ha⁻¹ year⁻¹, and 32.8 kg N ha⁻¹ year⁻¹ vs. 5.9 kg N ha⁻¹ year⁻¹), but less to below-ground litter (through fine root death) (2.71 Mg C ha⁻¹ year⁻¹ vs. 3.57 Mg C ha⁻¹ year⁻¹ and 38.9 kg N ha⁻¹ year⁻¹ vs. 81.4 kg N ha⁻¹ year⁻¹). The shift in net primary production from below-ground dominance to above-ground dominance after planting trees onto the pasture, and the slower turnover of litter in the plantation, played a key role in the reduction in soil C in the plantation ecosystem. In conclusion, planting pine trees onto a native temperate Australian pasture sequestered a significant amount of C (net 86 Mg C ha⁻¹, averaging 5.4 Mg C ha⁻¹ year⁻¹) from the atmosphere in 16 years despite the loss of 14 Mg C ha⁻¹ from the soil organic matter.en
dc.publisherElsevier BVen
dc.relation.ispartofAgriculture, Ecosystems & Environmenten
dc.titleCarbon and nitrogen stocks in a native pasture and an adjacent 16-year-old 'Pinus radiata' D. Don. plantation in Australiaen
dc.typeJournal Articleen
dc.subject.keywordsEcosystem Functionen
dc.subject.keywordsEcological Impacts of Climate Changeen
local.contributor.firstnameLanbin Ben
local.contributor.firstnameKelvin Den
local.contributor.firstnameRoger Men
local.subject.for2008050101 Ecological Impacts of Climate Changeen
local.subject.for2008050102 Ecosystem Functionen
local.subject.seo2008960305 Ecosystem Adaptation to Climate Changeen
local.subject.seo2008960302 Climate Change Mitigation Strategiesen
local.subject.seo2008960301 Climate Change Adaptation Measuresen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.record.institutionUniversity of New Englanden
local.publisher.placeThe Netherlandsen
local.title.maintitleCarbon and nitrogen stocks in a native pasture and an adjacent 16-year-old 'Pinus radiata' D. Don. plantation in Australiaen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 306<br />Views: 336<br />Downloads: 0en, Lanbin Ben, Annetteen, Kelvin Den, Roger Men
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