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    Rights statement: This is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, 624, 2018 DOI: 10.1016/j.scitoenv.2017.12.081

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Management intensity controls soil N2O fluxes in an Afromontane ecosystem

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Management intensity controls soil N2O fluxes in an Afromontane ecosystem. / Wanyama, I.; Pelster, D.E.; Arias-Navarro, C. et al.

In: Science of the Total Environment, Vol. 624, 15.05.2018, p. 769-780.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Wanyama, I, Pelster, DE, Arias-Navarro, C, Butterbach-Bahl, K, Verchot, LV & Rufino, MC 2018, 'Management intensity controls soil N2O fluxes in an Afromontane ecosystem', Science of the Total Environment, vol. 624, pp. 769-780. https://doi.org/10.1016/j.scitotenv.2017.12.081

APA

Wanyama, I., Pelster, D. E., Arias-Navarro, C., Butterbach-Bahl, K., Verchot, L. V., & Rufino, M. C. (2018). Management intensity controls soil N2O fluxes in an Afromontane ecosystem. Science of the Total Environment, 624, 769-780. https://doi.org/10.1016/j.scitotenv.2017.12.081

Vancouver

Wanyama I, Pelster DE, Arias-Navarro C, Butterbach-Bahl K, Verchot LV, Rufino MC. Management intensity controls soil N2O fluxes in an Afromontane ecosystem. Science of the Total Environment. 2018 May 15;624:769-780. Epub 2017 Dec 27. doi: 10.1016/j.scitotenv.2017.12.081

Author

Wanyama, I. ; Pelster, D.E. ; Arias-Navarro, C. et al. / Management intensity controls soil N2O fluxes in an Afromontane ecosystem. In: Science of the Total Environment. 2018 ; Vol. 624. pp. 769-780.

Bibtex

@article{1c59fb5423c442b0912892f05c93f21a,
title = "Management intensity controls soil N2O fluxes in an Afromontane ecosystem",
abstract = "Studies that quantify nitrous oxide (N2O) fluxes from African tropical forests and adjacent managed land uses are scarce. The expansion of smallholder agriculture and commercial agriculture into the Mau forest, the largest montane forest in Kenya, has caused large-scale land use change over the last decades. We measured annual soil N2O fluxes between August 2015 and July 2016 from natural forests and compared them to the N2O fluxes from land either managed by smallholder farmers for grazing and tea production, or commercial tea and eucalyptus plantations (n = 18). Air samples from 5 pooled static chambers were collected between 8:00 am and 11:30 am and used within each plot to calculate the gas flux rates. Annual soil N2O fluxes ranged between 0.2 and 2.9 kg N ha− 1 yr− 1 at smallholder sites and 0.6–1.7 kg N ha− 1 yr− 1 at the commercial agriculture sites, with no difference between land uses (p = 0.98 and p = 0.18, respectively). There was marked variation within land uses and, in particular, within those managed by smallholder farmers where management was also highly variable. Plots receiving fertilizer applications and those with high densities of livestock showed the highest N2O fluxes (1.6 ± 0.3 kg N2O-N ha− 1 yr− 1, n = 7) followed by natural forests (1.1 ± 0.1 kg N2O-N ha− 1 yr− 1, n = 6); although these were not significantly different (p = 0.19). Significantly lower fluxes (0.5 ± 0.1 kg N ha− 1 yr− 1, p < 0.01, n = 5) were found on plots that received little or no inputs. Daily soil N2O flux rates were not correlated with concurrent measurements of water filled pore space (WFPS), soil temperature or inorganic nitrogen (IN) concentrations. However, IN intensity, a measure of exposure of soil microbes (in both time and magnitude) to IN concentrations was strongly correlated with annual soil N2O fluxes.",
keywords = "Tea, Grazing, Plantations, Agricultural intensification, Inorganic N intensity",
author = "I. Wanyama and D.E. Pelster and C. Arias-Navarro and K. Butterbach-Bahl and L.V. Verchot and M.C. Rufino",
note = "This is the author{\textquoteright}s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, 624, 2018 DOI: 10.1016/j.scitoenv.2017.12.081",
year = "2018",
month = may,
day = "15",
doi = "10.1016/j.scitotenv.2017.12.081",
language = "English",
volume = "624",
pages = "769--780",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier Science B.V.",

}

RIS

TY - JOUR

T1 - Management intensity controls soil N2O fluxes in an Afromontane ecosystem

AU - Wanyama, I.

AU - Pelster, D.E.

AU - Arias-Navarro, C.

AU - Butterbach-Bahl, K.

AU - Verchot, L.V.

AU - Rufino, M.C.

N1 - This is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, 624, 2018 DOI: 10.1016/j.scitoenv.2017.12.081

PY - 2018/5/15

Y1 - 2018/5/15

N2 - Studies that quantify nitrous oxide (N2O) fluxes from African tropical forests and adjacent managed land uses are scarce. The expansion of smallholder agriculture and commercial agriculture into the Mau forest, the largest montane forest in Kenya, has caused large-scale land use change over the last decades. We measured annual soil N2O fluxes between August 2015 and July 2016 from natural forests and compared them to the N2O fluxes from land either managed by smallholder farmers for grazing and tea production, or commercial tea and eucalyptus plantations (n = 18). Air samples from 5 pooled static chambers were collected between 8:00 am and 11:30 am and used within each plot to calculate the gas flux rates. Annual soil N2O fluxes ranged between 0.2 and 2.9 kg N ha− 1 yr− 1 at smallholder sites and 0.6–1.7 kg N ha− 1 yr− 1 at the commercial agriculture sites, with no difference between land uses (p = 0.98 and p = 0.18, respectively). There was marked variation within land uses and, in particular, within those managed by smallholder farmers where management was also highly variable. Plots receiving fertilizer applications and those with high densities of livestock showed the highest N2O fluxes (1.6 ± 0.3 kg N2O-N ha− 1 yr− 1, n = 7) followed by natural forests (1.1 ± 0.1 kg N2O-N ha− 1 yr− 1, n = 6); although these were not significantly different (p = 0.19). Significantly lower fluxes (0.5 ± 0.1 kg N ha− 1 yr− 1, p < 0.01, n = 5) were found on plots that received little or no inputs. Daily soil N2O flux rates were not correlated with concurrent measurements of water filled pore space (WFPS), soil temperature or inorganic nitrogen (IN) concentrations. However, IN intensity, a measure of exposure of soil microbes (in both time and magnitude) to IN concentrations was strongly correlated with annual soil N2O fluxes.

AB - Studies that quantify nitrous oxide (N2O) fluxes from African tropical forests and adjacent managed land uses are scarce. The expansion of smallholder agriculture and commercial agriculture into the Mau forest, the largest montane forest in Kenya, has caused large-scale land use change over the last decades. We measured annual soil N2O fluxes between August 2015 and July 2016 from natural forests and compared them to the N2O fluxes from land either managed by smallholder farmers for grazing and tea production, or commercial tea and eucalyptus plantations (n = 18). Air samples from 5 pooled static chambers were collected between 8:00 am and 11:30 am and used within each plot to calculate the gas flux rates. Annual soil N2O fluxes ranged between 0.2 and 2.9 kg N ha− 1 yr− 1 at smallholder sites and 0.6–1.7 kg N ha− 1 yr− 1 at the commercial agriculture sites, with no difference between land uses (p = 0.98 and p = 0.18, respectively). There was marked variation within land uses and, in particular, within those managed by smallholder farmers where management was also highly variable. Plots receiving fertilizer applications and those with high densities of livestock showed the highest N2O fluxes (1.6 ± 0.3 kg N2O-N ha− 1 yr− 1, n = 7) followed by natural forests (1.1 ± 0.1 kg N2O-N ha− 1 yr− 1, n = 6); although these were not significantly different (p = 0.19). Significantly lower fluxes (0.5 ± 0.1 kg N ha− 1 yr− 1, p < 0.01, n = 5) were found on plots that received little or no inputs. Daily soil N2O flux rates were not correlated with concurrent measurements of water filled pore space (WFPS), soil temperature or inorganic nitrogen (IN) concentrations. However, IN intensity, a measure of exposure of soil microbes (in both time and magnitude) to IN concentrations was strongly correlated with annual soil N2O fluxes.

KW - Tea

KW - Grazing

KW - Plantations

KW - Agricultural intensification

KW - Inorganic N intensity

U2 - 10.1016/j.scitotenv.2017.12.081

DO - 10.1016/j.scitotenv.2017.12.081

M3 - Journal article

VL - 624

SP - 769

EP - 780

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -