气候变化领域集成服务门户(CCPortal): Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland

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DOI	10.1007/s10533-020-00699-y
	Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland
	Andresen L.C.; Carrillo Y.; Macdonald C.A.; Castañeda-Gómez L.; Bodé S.; Rütting T.
发表日期	2020
ISSN	0168-2563
起始页码	297
结束页码	312
卷号	150 期号:3
英文摘要	It is uncertain how the predicted further rise of atmospheric carbon dioxide (CO2) concentration will affect plant nutrient availability in the future through indirect effects on the gross rates of nitrogen (N) mineralization (production of ammonium) and depolymerization (production of free amino acids) in soil. The response of soil nutrient availability to increasing atmospheric CO2 is particularly important for nutrient poor ecosystems. Within a FACE (Free-Air Carbon dioxide Enrichment) experiment in a native, nutrient poor Eucalyptus woodland (EucFACE) with low soil organic matter (≤ 3%), our results suggested there was no shortage of N. Despite this, microbial N use efficiency was high (c. 90%). The free amino acid (FAA) pool had a fast turnover time (4 h) compared to that of ammonium (NH4+) which was 11 h. Both NH4-N and FAA-N were important N pools; however, protein depolymerization rate was three times faster than gross N mineralization rates, indicating that organic N is directly important in the internal ecosystem N cycle. Hence, the depolymerization was the major provider of plant available N, while the gross N mineralization rate was the constraining factor for inorganic N. After two years of elevated CO2, no major effects on the pools and rates of the soil N cycle were found in spring (November) or at the end of summer (March). The limited response of N pools or N transformation rates to elevated CO2 suggest that N availability was not the limiting factor behind the lack of plant growth response to elevated CO2, previously observed at the site. © 2020, The Author(s).
英文关键词	Depolymerization; Free amino acids; Gross N mineralization rate; Phosphorus limitation
语种	英语
scopus关键词	amino acid; carbon dioxide; growth response; limiting factor; methane; mineralization; nutrient dynamics; phosphorus; protein; woodland; Eucalyptus
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153103
作者单位	Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Hawkesbury Institute for the Environment (HIE), Western Sydney University, Richmond, Australia; Department of Green Chemistry and Technology, Ghent University, Gent, Belgium
推荐引用方式 GB/T 7714	Andresen L.C.,Carrillo Y.,Macdonald C.A.,et al. Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland[J],2020,150(3).
APA	Andresen L.C.,Carrillo Y.,Macdonald C.A.,Castañeda-Gómez L.,Bodé S.,&Rütting T..(2020).Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland.Biogeochemistry,150(3).
MLA	Andresen L.C.,et al."Nitrogen dynamics after two years of elevated CO2 in phosphorus limited Eucalyptus woodland".Biogeochemistry 150.3(2020).