Soil greenhouse gas emissions from a sisal chronosequence in Kenya

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Wachiye , S A , Merbold , L , Vesala , T , Rinne , J , Leitner , S , Räsänen , M , Vuorinne , I , Heiskanen , J & Pellikka , P 2021 , ' Soil greenhouse gas emissions from a sisal chronosequence in Kenya ' , Agricultural and Forest Meteorology , vol. 307 , 108465 . https://doi.org/10.1016/j.agrformet.2021.108465

Title: Soil greenhouse gas emissions from a sisal chronosequence in Kenya
Author: Wachiye, Sheila Aswani; Merbold, Lutz; Vesala, Timo; Rinne, Janne; Leitner, Sonja; Räsänen, Matti; Vuorinne, Ilja; Heiskanen, Janne; Pellikka, Petri
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
Date: 2021-09-15
Language: eng
Number of pages: 15
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
URI: http://hdl.handle.net/10138/333462
Abstract: Sisal (Agave sisalana) is a climate-resilient crop grown on large-scale farms in semi-arid areas. However, no studies have investigated soil greenhouse gas (GHGs: CO2, N2O and CH4) fluxes from these plantations and how they relate to other land cover types. We examined GHG fluxes (Fs) in a sisal chronosequence at Teita Sisal Estate in southern Kenya. The effects of stand age on Fs were examined using static GHG chambers and gas chromatography for a period of one year in seven stands: young stands aged 1-3 years, mature stands aged 7-8 years, and old stands aged 13-14 years. Adjacent bushland served as a control site representing the surrounding land use type. Mean CO2 fluxes were highest in the oldest stand (56 +/- 3 mg C m(-2) h(-1)) and lowest in the 8-year old stand (38 +/- 3 mg C m(-2) h(-1)), which we attribute to difference in root respiration between the stand. All stands had 13-28% higher CO2 fluxes than bushland (32 +/- 3 mg C m(-2) h(-1)). CO2 fluxes in the wet season were about 70% higher than dry season across all sites. They were influenced by soil water content (W-S) and vegetation phenology. Mean N2O fluxes were very low (
Subject: 4111 Agronomy
4112 Forestry
1171 Geosciences
Soil moisture
Carbon dioxide (CO2)
Nitrous oxide (N2O)
Methane (CH4)
Sub-Saharan Africa
Land-use change, Static chamber
LAND-USE TYPES
NITROUS-OXIDE
SPATIAL VARIATION
ROOT RESPIRATION
CARBON-DIOXIDE
METHANE FLUXES
CO2 EFFLUX
EXCHANGE
N2O
SAVANNA
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