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Large differences in CO 2 emissions from two dairy farms on a drained peatland driven by contrasting respiration rates during seasonal dry conditions.

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العنوان: Large differences in CO 2 emissions from two dairy farms on a drained peatland driven by contrasting respiration rates during seasonal dry conditions.
المؤلفون: Campbell DI; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand. Electronic address: david.campbell@waikato.ac.nz., Glover-Clark GL; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand., Goodrich JP; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand., Morcom CP; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand., Schipper LA; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand., Wall AM; School of Science, Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand.
المصدر: The Science of the total environment [Sci Total Environ] 2021 Mar 15; Vol. 760, pp. 143410. Date of Electronic Publication: 2020 Nov 07.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0330500 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-1026 (Electronic) Linking ISSN: 00489697 NLM ISO Abbreviation: Sci Total Environ Subsets: PubMed not MEDLINE; MEDLINE
أسماء مطبوعة: Original Publication: Amsterdam, Elsevier.
مستخلص: Drained peatlands are major sources of CO 2 to the atmosphere, yet the effects of land management and hydrological extremes have been little-studied at spatial scales relevant to agricultural enterprises. We measured fluxes of CO 2 using the eddy covariance (EC) technique at two adjacent dairy farms on a drained peatland in Aotearoa New Zealand with remaining peat depths 5.5-8 m. One site (SD) had shallow surface drains and mean water table depth (WTD) -657 mm, while the other site (BD) had deep field border drains and mean WTD -838 mm. Net ecosystem CO 2 production (NEP) was similar at the two sites when the soils were moist but diverged during late-summer drying, with site BD having 4.56 t C ha -1 greater CO 2 emission than site SD over the four-month dry period. Soil drying reduced gross primary production (GPP) at both sites, while ecosystem respiration (ER) was reduced at site SD but not at site BD. The low dry season respiration rates at site SD contributed to near-zero annual NEP, while higher respiration rates at site BD led to annual CO 2 loss of -4.95 ± 0.59 t C ha -1  yr -1 . Accounting for other imports and exports of carbon, annual net ecosystem carbon balances were -2.23 and -8.47 t C ha -1  yr -1 at sites SD and BD, respectively. It is likely that the contrasting dry season respiration rates resulted from differences in soil physical properties affecting soil moisture vertical redistribution and availability to plants and microbes rather than from the relatively small differences in WTD. These differences could be caused by soil physical disturbances during pasture renewal or paddock recontouring, or time since initial drainage. Therefore, improved soil management might provide practical mitigation against excessive CO 2 emissions during dry conditions, including droughts.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
فهرسة مساهمة: Keywords: Capillary zone; Drainage; Drought; Eddy covariance; Net ecosystem carbon balance; Peat respiration
تواريخ الأحداث: Date Created: 20201120 Date Completed: 20210119 Latest Revision: 20210119
رمز التحديث: 20240628
DOI: 10.1016/j.scitotenv.2020.143410
PMID: 33213925
قاعدة البيانات: MEDLINE
الوصف
تدمد:1879-1026
DOI:10.1016/j.scitotenv.2020.143410