Abstract:Abstract. Current water management in drained peatlands to facilitate agricultural use, leads to soil subsidence and strongly increases greenhouse gas (GHG) emission. High-density, sub-soil irrigation/drainage systems have been proposed as a potential climate mitigation measure, while maintaining high biomass production. In summer, sub-soil irrigation can potentially reduce peat decomposition by preventing groundwater tables to drop below −60 cm. In 2017–2018, we evaluated the effects of sub-soil irrig… Show more
“…The minor fraction of the CO 2 flux related to the decomposition of organic soil in the total ecosystem respiratory CO 2 flux (in the order of magnitude of 5-10%) may have contributed to the difficulty in identifying statistically significant differences. Weideveld et al (2020) measured a similar difference in respiratory CO 2 flux between two drainage levels in a drained peat grassland. They equally had to conclude that there was no statistically significant difference in CO 2 flux between both drainage levels, possibly related to the very same high background ecosystem respiratory CO 2 flux.…”
Section: Statistical Analysis and Process-based Modellingmentioning
confidence: 68%
“…Ammann et al 2020, Heimsch et al 2020, Zeeman et al 2010 or closed chambers (e.g. Hoffmann et al 2015, Spielmann et al 2020, Weideveld et al 2020.…”
Section: Measurement Methodologiesmentioning
confidence: 99%
“…Particularly grasslands on drained peat soils are characterised by a large and complex spatial heterogeneity, such as the interaction between distance to drainage ditches, lateral conductivity and weather conditions. Such ecosystems require a careful selection of closed chamber measurement locations (Weideveld et al 2020) and even then it remains difficult to scale the measurements.…”
Section: Measurement Methodologiesmentioning
confidence: 99%
“…This aligns with the observation in this study that the 5-10% difference in the respiratory CO 2 flux as a result of the decomposition of peat is of the order of magnitude which determines whether a peat pasture is an annual CO 2 sink or source. Weideveld et al (2020) measured the effect of sub-soil irrigation pipes at a depth of -70 cm in drained peat pasture, mainly reducing the depth of the groundwater table in summer relative to pasture without such irrigation. Both drainage levels were characterised by a net CO 2 release.…”
Section: A34 Net Co 2 Emissions On Drainagementioning
confidence: 99%
“…An alternative measure of more recent date is the application of lateral drainage, which particularly addresses the problem with limited lateral diffusivity and a persistent concave groundwater surface (e.g. Hoving et al 2008, Weideveld et al 2020. Lateral drainage evens out large differences in groundwater depth and raises the groundwater level during the growing season when the aerobic organic soil profile is deepest and decomposition of peat highest.…”
The role of biospheric activity in the exchange of C is first shown in the variation in the amount of CO 2 which is sequestered annually by biosphere and oceans. Whereas General introduction Chapter 1 13 General introduction Chapter 1 General introduction Chapter 1 19 General introduction Chapter 1 21 General introduction Chapter 1 25 2 Chapter 2 Temperature sensitivity of photosynthesis in Lolium perenne swards: a comparison of two methods for deriving photosynthetic parameters from in vivo measurements Originally published as B.
“…The minor fraction of the CO 2 flux related to the decomposition of organic soil in the total ecosystem respiratory CO 2 flux (in the order of magnitude of 5-10%) may have contributed to the difficulty in identifying statistically significant differences. Weideveld et al (2020) measured a similar difference in respiratory CO 2 flux between two drainage levels in a drained peat grassland. They equally had to conclude that there was no statistically significant difference in CO 2 flux between both drainage levels, possibly related to the very same high background ecosystem respiratory CO 2 flux.…”
Section: Statistical Analysis and Process-based Modellingmentioning
confidence: 68%
“…Ammann et al 2020, Heimsch et al 2020, Zeeman et al 2010 or closed chambers (e.g. Hoffmann et al 2015, Spielmann et al 2020, Weideveld et al 2020.…”
Section: Measurement Methodologiesmentioning
confidence: 99%
“…Particularly grasslands on drained peat soils are characterised by a large and complex spatial heterogeneity, such as the interaction between distance to drainage ditches, lateral conductivity and weather conditions. Such ecosystems require a careful selection of closed chamber measurement locations (Weideveld et al 2020) and even then it remains difficult to scale the measurements.…”
Section: Measurement Methodologiesmentioning
confidence: 99%
“…This aligns with the observation in this study that the 5-10% difference in the respiratory CO 2 flux as a result of the decomposition of peat is of the order of magnitude which determines whether a peat pasture is an annual CO 2 sink or source. Weideveld et al (2020) measured the effect of sub-soil irrigation pipes at a depth of -70 cm in drained peat pasture, mainly reducing the depth of the groundwater table in summer relative to pasture without such irrigation. Both drainage levels were characterised by a net CO 2 release.…”
Section: A34 Net Co 2 Emissions On Drainagementioning
confidence: 99%
“…An alternative measure of more recent date is the application of lateral drainage, which particularly addresses the problem with limited lateral diffusivity and a persistent concave groundwater surface (e.g. Hoving et al 2008, Weideveld et al 2020. Lateral drainage evens out large differences in groundwater depth and raises the groundwater level during the growing season when the aerobic organic soil profile is deepest and decomposition of peat highest.…”
The role of biospheric activity in the exchange of C is first shown in the variation in the amount of CO 2 which is sequestered annually by biosphere and oceans. Whereas General introduction Chapter 1 13 General introduction Chapter 1 General introduction Chapter 1 19 General introduction Chapter 1 21 General introduction Chapter 1 25 2 Chapter 2 Temperature sensitivity of photosynthesis in Lolium perenne swards: a comparison of two methods for deriving photosynthetic parameters from in vivo measurements Originally published as B.
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