气候变化领域集成服务门户(CCPortal): Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems

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DOI	10.1007/s10533-020-00700-8
	Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems
	Rodionov A.; Bauke S.L.; von Sperber C.; Hoeschen C.; Kandeler E.; Kruse J.; Lewandowski H.; Marhan S.; Mueller C.W.; Simon M.; Tamburini F.; Uhlig D.; von Blanckenburg F.; Lang F.; Amelung W.
发表日期	2020
ISSN	0168-2563
起始页码	313
结束页码	328
卷号	150 期号:3
英文摘要	Tree roots penetrate the soil to several meters depth, but the role of subsoils for the supply of nutrient elements such as phosphorus (P) to the trees is poorly understood. Here, we tested the hypothesis that increased P deficiency in the topsoil results in an increased microbial recycling of P from the forest subsoil. We sampled soils from four German temperate forest sites representing a gradient in total P stocks. We analyzed the oxygen isotopic composition of HCl-extractable phosphate (δ18OP) and identified differences in P speciation with increasing soil depth using X-ray absorption near-edge structure (XANES) spectroscopy. We further determined microbial oxygen demand with and without nutrient supply at different soil depths to analyse nutrient limitation of microbial growth and used nanoscale secondary ion mass spectrometry (NanoSIMS) to visualize spatial P gradients in the rhizosphere. We found that δ18OP values in the topsoil of all sites were close to the isotopic signal imparted by biological cycling when oxygen isotopes in phosphate are exchanged by enzymatic activity. However, with increasing soil depth and increasing HCl-P concentrations, δ18Ο values continuously decreased towards values expected for primary minerals in parent material at depths below 60 cm at sites with high subsoil P stocks and below more than 2 m at sites with low subsoil P stocks, respectively. For these depths, XANES spectra also indicated the presence of apatite. NanoSIMS images showed an enrichment of P in the rhizosphere in the topsoil of a site with high P stocks, while this P enrichment was absent at a site with low P stocks and in both subsoils. Addition of C, N and P alone or in combination revealed that microbial activity in subsoils of sites with low P stocks was mostly P limited, whereas sites with high P stocks indicated N limitation or N and P co-limitation. We conclude that subsoil P resources are recycled by trees and soil microorganisms. With continued weathering of the bedrock and mobilisation of P from the weathered rocks, P cycling will proceed to greater depths, especially at sites characterised by P limitation. © 2020, The Author(s).
英文关键词	Microbial P cycling; NanoSIMS; Oxygen isotopes; Phosphate; Soil; XANES
语种	英语
scopus关键词	bedrock; biogeochemistry; forest ecosystem; isotopic composition; microbial activity; nutrient limitation; parent material; phosphate; phosphorus cycle; soil depth; soil microorganism; temperate forest
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/153101
作者单位	Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Nussallee 13, Bonn, 53115, Germany; Soil Ecology, University of Bayreuth, Dr.-Hans-Frisch-Str. 1-3, Bayreuth, 95448, Germany; Department of Geography, McGill University, 805 Sherbrooke St. W., Montreal, QC H3A 0B9, Canada; Chair of Soil Science, Department of Ecology and Ecosystem Management, Technical University of Munich, Emil-Ramann-Str. 2, Freising-Weihenstephan, 85350, Germany; Institute of Soil Science and Land Evaluation, Soil Biology Department, University of Hohenheim, Emil-Wolff-Str. 27, Stuttgart, 70599, Germany; Institute of Bio- and Geosciences – Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, Jülich, 52428, Germany; Department of Geosciences and Natural Resource Management, Section for Geography, University of Copenhagen, Øster Voldgade 10, Copenhagen, 1350, Denmark; Institute of Agricultural Sciences, ETH Zurich, Eschikon 33, Lindau, 8315, Switzerland; ...
推荐引用方式 GB/T 7714	Rodionov A.,Bauke S.L.,von Sperber C.,et al. Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems[J],2020,150(3).
APA	Rodionov A..,Bauke S.L..,von Sperber C..,Hoeschen C..,Kandeler E..,...&Amelung W..(2020).Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems.Biogeochemistry,150(3).
MLA	Rodionov A.,et al."Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems".Biogeochemistry 150.3(2020).