DOI: 10.1111/gcb.13147
论文题名: Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus-limited Eucalyptus woodland
作者: Hasegawa S. ; Macdonald C.A. ; Power S.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 4 起始页码: 1628
结束页码: 1643
语种: 英语
英文关键词: CO2
; Dissolved organic carbon
; Eucalyptus free-air CO2 enrichment
; FACE
; Free-air CO2 enrichment
; Phosphorus limitation
; Soil nutrients
Scopus关键词: carbon dioxide
; dissolved organic carbon
; mobilization
; nutrient availability
; nutrient cycling
; nutrient enrichment
; nutrient limitation
; phosphorus
; soil nitrogen
; soil nutrient
; woodland
; Eucalyptus
; artificial membrane
; carbon dioxide
; ion exchange resin
; nitrogen
; phosphorus
; soil
; artificial membrane
; chemistry
; ecosystem
; Eucalyptus
; forest
; New South Wales
; pH
; season
; soil
; Carbon Dioxide
; Ecosystem
; Eucalyptus
; Forests
; Hydrogen-Ion Concentration
; Ion Exchange Resins
; Membranes, Artificial
; New South Wales
; Nitrogen
; Phosphorus
; Seasons
; Soil
英文摘要: Free-air CO2 enrichment (FACE) experiments have demonstrated increased plant productivity in response to elevated (e)CO2, with the magnitude of responses related to soil nutrient status. Whilst understanding nutrient constraints on productivity responses to eCO2 is crucial for predicting carbon uptake and storage, very little is known about how eCO2 affects nutrient cycling in phosphorus (P)-limited ecosystems. Our study investigates eCO2 effects on soil N and P dynamics at the EucFACE experiment in Western Sydney over an 18-month period. Three ambient and three eCO2 (+150 ppm) FACE rings were installed in a P-limited, mature Cumberland Plain Eucalyptus woodland. Levels of plant accessible nutrients, evaluated using ion exchange resins, were increased under eCO2, compared to ambient, for nitrate (+93%), ammonium (+12%) and phosphate (+54%). There was a strong seasonality to responses, particularly for phosphate, resulting in a relatively greater stimulation in available P, compared to N, under eCO2 in spring and summer. eCO2 was also associated with faster nutrient turnover rates in the first six months of the experiment, with higher N (+175%) and P (+211%) mineralization rates compared to ambient rings, although this difference did not persist. Seasonally dependant effects of eCO2 were seen for concentrations of dissolved organic carbon in soil solution (+31%), and there was also a reduction in bulk soil pH (-0.18 units) observed under eCO2. These results demonstrate that CO2 fertilization increases nutrient availability - particularly for phosphate - in P-limited soils, likely via increased plant belowground investment in labile carbon and associated enhancement of microbial turnover of organic matter and mobilization of chemically bound P. Early evidence suggests that there is the potential for the observed increases in P availability to support increased ecosystem C-accumulation under future predicted CO2 concentrations. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61440
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, United Kingdom; Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia
Recommended Citation:
Hasegawa S.,Macdonald C.A.,Power S.A.. Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus-limited Eucalyptus woodland[J]. Global Change Biology,2016-01-01,22(4)