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Interactive effects of biochar addition and elevated carbon dioxide concentration on soil carbon and nitrogen pools in mine spoil

journal contribution
posted on 24.07.2019, 00:00 by Y Zhang, H Chen, Shahla Hosseini BaiShahla Hosseini Bai, C Menke, M Zhang, Z Xu
Purpose: This study aimed to assess the effects of biochar on improving nitrogen (N) pools in mine spoil and examine the effects of elevated CO2 on soil carbon (C) storage. Materials and methods: The experiment consisted of three plant species (Austrostipa ramossissima, Dichelachne micrantha, and Lomandra longifolia) planted in the N-poor mine spoil with application of biochar produced at three temperatures (650, 750, and 850 °C) under both ambient (400 μL L−1) and elevated (700 μL L−1) CO2. We assessed mine spoil total C and N concentrations and stable C and N isotope compositions (δ13C and δ15N), as well as hot water extractable organic C (HWEOC) and total N (HWETN) concentrations. Results and discussion: Soil total N significantly increased following biochar application across all species. Elevated CO2 induced soil C loss for A. ramossissima and D. micrantha without biochar application and D. micrantha with the application of biochar produced at 750 °C. In contrast, elevated CO2 exhibited no significant effect on soil total C for A. littoralis, D. micrantha, or L. longifolia under any other biochar treatments. Conclusions: Biochar application is a promising means to improve N retention and thus, reduce environmentally harmful N fluxes in mine spoil. However, elevated CO2 exhibited no significant effects on increasing soil total C, which indicated that mine spoil has limited potential to store rising atmospheric CO2. © 2017, Springer-Verlag GmbH Germany.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

17

Issue

10

Start Page

2400

End Page

2409

Number of Pages

10

eISSN

1614-7480

ISSN

1439-0108

Publisher

Sprimger, Germany

Peer Reviewed

Yes

Open Access

No

Acceptance Date

07/06/2017

External Author Affiliations

Chinese Academy of Sciences; University of the Sunshine Coast; Griffith University

Era Eligible

Yes

Journal

Journal of Soils and Sediments