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Title: New soil carbon sequestration with nitrogen enrichment: a meta-analysis

Abstract

Background and aims: Through agriculture and industry, humans are increasing the deposition and availability of nitrogen (N) in ecosystems worldwide. Carbon (C) isotope tracers provide useful insights into soil C dynamics, as they allow to study soil C pools of different ages. In this study we evaluated to what extent N enrichment affects soil C dynamics in experiments that applied C isotope tracers. Methods: Using meta-analysis, we synthesized data from 35 published papers. We made a distinction between “new C” and “old C” stocks, i.e., soil C derived from plant C input since the start of the isotopic enrichment, or unlabeled, pre-existing soil C. Results: Averaged across studies, N addition increased new soil C stocks (+30.3%), total soil C stocks (+6.1%) and soil C input proxies (+30.7%). Although N addition had no overall, average, effect on old soil C stocks and old soil C respiration, old soil C stocks increased with the amount of N added and respiration of old soil C declined. Nitrogen-induced effects on new soil C and soil C input both decreased with the amount of extraneous N added in control treatments. Conclusion: Although our findings require additional confirmation from long-term field experiments, our analysis provides isotopicmore » evidence that N addition stimulates soil C storage both by increasing soil C input and (at high N rates) by decreasing decomposition of old soil C. Furthermore, we demonstrate that the widely reported saturating response of plant growth to N enrichment also applies to new soil C storage.« less

Authors:
 [1];  [2];  [3];  [4];  [5]; ORCiD logo [6]
  1. Chinese Academy of Agricultural Sciences, Beijing (China); Univ. of Exeter (United Kingdom); Nanjing Agricultural Univ. (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Sydney, Camden, NSW (Australia)
  4. Northern Arizona Univ., Flagstaff, AZ (United States)
  5. Chinese Academy of Agricultural Sciences, Beijing (China); Nanjing Agricultural Univ. (China)
  6. Univ. of Exeter (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Key Research and Development Program of China; China Scholarship Council (CSC); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1660528
Report Number(s):
LLNL-JRNL-814084
Journal ID: ISSN 0032-079X; 1022258
Grant/Contract Number:  
AC52-07NA27344; SC0008270
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plant and Soil
Additional Journal Information:
Journal Volume: 454; Journal Issue: 1-2; Journal ID: ISSN 0032-079X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Isotopes; Nitrogen saturation; Nitrogen addition; Soil carbon dynamics; Soil carbon input

Citation Formats

Huang, Xiaomin, Terrer, César, Dijkstra, Feike A., Hungate, Bruce A., Zhang, Weijian, and van Groenigen, Kees Jan. New soil carbon sequestration with nitrogen enrichment: a meta-analysis. United States: N. p., 2020. Web. doi:10.1007/s11104-020-04617-x.
Huang, Xiaomin, Terrer, César, Dijkstra, Feike A., Hungate, Bruce A., Zhang, Weijian, & van Groenigen, Kees Jan. New soil carbon sequestration with nitrogen enrichment: a meta-analysis. United States. doi:10.1007/s11104-020-04617-x.
Huang, Xiaomin, Terrer, César, Dijkstra, Feike A., Hungate, Bruce A., Zhang, Weijian, and van Groenigen, Kees Jan. Mon . "New soil carbon sequestration with nitrogen enrichment: a meta-analysis". United States. doi:10.1007/s11104-020-04617-x.
@article{osti_1660528,
title = {New soil carbon sequestration with nitrogen enrichment: a meta-analysis},
author = {Huang, Xiaomin and Terrer, César and Dijkstra, Feike A. and Hungate, Bruce A. and Zhang, Weijian and van Groenigen, Kees Jan},
abstractNote = {Background and aims: Through agriculture and industry, humans are increasing the deposition and availability of nitrogen (N) in ecosystems worldwide. Carbon (C) isotope tracers provide useful insights into soil C dynamics, as they allow to study soil C pools of different ages. In this study we evaluated to what extent N enrichment affects soil C dynamics in experiments that applied C isotope tracers. Methods: Using meta-analysis, we synthesized data from 35 published papers. We made a distinction between “new C” and “old C” stocks, i.e., soil C derived from plant C input since the start of the isotopic enrichment, or unlabeled, pre-existing soil C. Results: Averaged across studies, N addition increased new soil C stocks (+30.3%), total soil C stocks (+6.1%) and soil C input proxies (+30.7%). Although N addition had no overall, average, effect on old soil C stocks and old soil C respiration, old soil C stocks increased with the amount of N added and respiration of old soil C declined. Nitrogen-induced effects on new soil C and soil C input both decreased with the amount of extraneous N added in control treatments. Conclusion: Although our findings require additional confirmation from long-term field experiments, our analysis provides isotopic evidence that N addition stimulates soil C storage both by increasing soil C input and (at high N rates) by decreasing decomposition of old soil C. Furthermore, we demonstrate that the widely reported saturating response of plant growth to N enrichment also applies to new soil C storage.},
doi = {10.1007/s11104-020-04617-x},
journal = {Plant and Soil},
issn = {0032-079X},
number = 1-2,
volume = 454,
place = {United States},
year = {2020},
month = {8}
}

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