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Title: Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests

Abstract

Elucidating climatic impacts on stream nutrient export and stoichiometry will improve the understanding of forest carbon (C) storage in a warmer world. We constructed C, nitrogen (N), and phosphorus (P) budgets in four watersheds within a rain-snow transition site and another four within a higher-elevation, snow-dominated site, in California’s mixed-conifer zone. We used these two sites in a space-for-time substitution to assess the potential effects of warming on nutrient cycles in currently snow-dominated areas that will become more rain-dominated. During a non-drought period (water year (WY) 2004 – 2011), mean annual stream exports of C and N in particulate forms at the transition site were double that at the snow-dominated site, suggesting that sediment-associated nutrient losses may increase with warming. The transition site had 12% lower N but double the P content in mineral horizons, lower N:P mass ratios in organic horizons, and lower stream export of dissolved inorganic N than the snow-dominated site. Furthermore, these differences suggest that montane forests may receive lower supply of N relative to P with warming. In addition, given strong interests in forest thinning to increase drought resiliency, we examined changes in stream nutrient export after thinning and during a major drought period (WYmore » 2013 – 2015). Stream exports of C, N, and P were similar between unthinned and thinned watersheds during drought, suggesting negligible thinning impacts on stream nutrient export during excessively dry periods. Taken together, our results suggest that as the climate warms, California’s montane forests may lose more nutrients through erosion and receive less N input than P.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [7]; ORCiD logo [1]
  1. Univ. of California, Merced, CA (United States)
  2. US Dept. of Agriculture, Fresno, CA (United States)
  3. Univ. of Nevada, Reno, NV (United States)
  4. Univ. of California, Merced, CA (United States); Univ. of California, Davis, CA (United States)
  5. Univ. of California, Merced, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Colorado River Basin Region, Palm Desert, CA (United States)
  7. Univ. of California, Irvine, CA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1846292
Report Number(s):
PNNL-SA-169732
Journal ID: ISSN 0168-2563
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Biogeochemistry
Additional Journal Information:
Journal Volume: 158; Journal Issue: 1; Journal ID: ISSN 0168-2563
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Critical zone; Elemental stoichiometry; Global warming; Sierra Nevada; Soil erosion; Space-for-time substitution

Citation Formats

Yang, Yang, Berhe, Asmeret Asefaw, Hunsaker, Carolyn T., Johnson, Dale W., Safeeq, Mohammad, Barnes, Morgan E., McCorkle, Emma P., Stacy, Erin M., Bales, Roger C., Bart, Ryan R., Goulden, Michael L., and Hart, Stephen C. Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests. United States: N. p., 2022. Web. doi:10.1007/s10533-021-00882-9.
Yang, Yang, Berhe, Asmeret Asefaw, Hunsaker, Carolyn T., Johnson, Dale W., Safeeq, Mohammad, Barnes, Morgan E., McCorkle, Emma P., Stacy, Erin M., Bales, Roger C., Bart, Ryan R., Goulden, Michael L., & Hart, Stephen C. Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests. United States. https://doi.org/10.1007/s10533-021-00882-9
Yang, Yang, Berhe, Asmeret Asefaw, Hunsaker, Carolyn T., Johnson, Dale W., Safeeq, Mohammad, Barnes, Morgan E., McCorkle, Emma P., Stacy, Erin M., Bales, Roger C., Bart, Ryan R., Goulden, Michael L., and Hart, Stephen C. Tue . "Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests". United States. https://doi.org/10.1007/s10533-021-00882-9. https://www.osti.gov/servlets/purl/1846292.
@article{osti_1846292,
title = {Impacts of climate and disturbance on nutrient fluxes and stoichiometry in mixed-conifer forests},
author = {Yang, Yang and Berhe, Asmeret Asefaw and Hunsaker, Carolyn T. and Johnson, Dale W. and Safeeq, Mohammad and Barnes, Morgan E. and McCorkle, Emma P. and Stacy, Erin M. and Bales, Roger C. and Bart, Ryan R. and Goulden, Michael L. and Hart, Stephen C.},
abstractNote = {Elucidating climatic impacts on stream nutrient export and stoichiometry will improve the understanding of forest carbon (C) storage in a warmer world. We constructed C, nitrogen (N), and phosphorus (P) budgets in four watersheds within a rain-snow transition site and another four within a higher-elevation, snow-dominated site, in California’s mixed-conifer zone. We used these two sites in a space-for-time substitution to assess the potential effects of warming on nutrient cycles in currently snow-dominated areas that will become more rain-dominated. During a non-drought period (water year (WY) 2004 – 2011), mean annual stream exports of C and N in particulate forms at the transition site were double that at the snow-dominated site, suggesting that sediment-associated nutrient losses may increase with warming. The transition site had 12% lower N but double the P content in mineral horizons, lower N:P mass ratios in organic horizons, and lower stream export of dissolved inorganic N than the snow-dominated site. Furthermore, these differences suggest that montane forests may receive lower supply of N relative to P with warming. In addition, given strong interests in forest thinning to increase drought resiliency, we examined changes in stream nutrient export after thinning and during a major drought period (WY 2013 – 2015). Stream exports of C, N, and P were similar between unthinned and thinned watersheds during drought, suggesting negligible thinning impacts on stream nutrient export during excessively dry periods. Taken together, our results suggest that as the climate warms, California’s montane forests may lose more nutrients through erosion and receive less N input than P.},
doi = {10.1007/s10533-021-00882-9},
journal = {Biogeochemistry},
number = 1,
volume = 158,
place = {United States},
year = {Tue Jan 18 00:00:00 EST 2022},
month = {Tue Jan 18 00:00:00 EST 2022}
}

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