Responses of CO2 Exchange and Primary Production of the Ecosystem Components to Environmental Changes in a Mountain Peatland

Otieno, Dennis; Wartinger, Margarete; Nishiwaki, A.; Hussain, Mubasher; Muhr, Jan; Borken, Werner; Lischeid, Gunnar

doi:10.1007/s10021-009-9245-5

Cited by 43 publications

(46 citation statements)

References 39 publications

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“…It was found that the light use efficiency increases with development of a crop (Suyker et al, 2005). Positive correlation between a and LAI with R 2 = 0.83-0.93 was reported for grass component of a fen ecosystem (Otieno et al, 2009) and with R 2 = 0.40-0.98 for a variety of crops (Lindner et al, 2015). In our study, comparing eqs.…”

Section: Norma Lize D S Ta Nda Rd De Via Tion Norma Lize D S Ta Nda Rsupporting

confidence: 51%

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Zhao

Lüers

2016

Sci. China Earth Sci.

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The estimation of carbon exchange between ecosystems and the atmosphere suffers unavoidable data gaps in eddy-covariance technique, especially for short-living and fast-growing croplands. In this study we developed a modified gap-filling scheme introducing a leaf area index factor as the vegetation status information based on the conventional light response function for two East-Asian cropland sites (rice and potatoes). This scheme's performance is comparable to the conventional time window scheme, but has the advantage when the gaps are large compared to the total length of the time series. To investigate how the time binning approach performs for fast-growing croplands, we tested different widths of the time window, showing that a four-day window for the potato field and an eight-day time window for the rice field perform the best. The insufficiency of the conventional temperature binning approach was explained as well as the influence of vapor pressure deficit. We found that vapor pressure deficit plays a minor role in both the potato and the rice fields under Asian monsoon weather conditions with the exception of the early pre-monsoon growing stage of the potatoes. Consequently, we recommend using the conventional time-window scheme together with our new leaf-light response function to fill data gaps of net ecosystem exchange in fast-growing croplands.

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Section: Norma Lize D S Ta Nda Rd De Via Tion Norma Lize D S Ta Nda Rsupporting

confidence: 51%

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Zhao

Lüers

2016

Sci. China Earth Sci.

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“…In a previous study at our site, soil CO 2 efflux contributed on average 61 % to ecosystem respiration during June to October (Otieno et al, 2009). Considering the 14 C-based estimates of heterotrophic respiration from June to October 2009 (Fig.…”

Section: Partitioning Of Soil Co 2 Effluxesmentioning

confidence: 71%

Partitioning of soil CO<sub>2</sub> efflux in un-manipulated and experimentally flooded plots of a temperate fen

Wunderlich

Borken

2012

Biogeosciences

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Abstract.Peatlands store large amounts of organic carbon, but the carbon stock is sensitive to changes in precipitation or water table manipulations. Restoration of drained peatlands by drain blocking and flooding is a common measure to conserve and augment the carbon stock of peatland soils. Here, we report to what extent flooding affected the contribution of heterotrophic and rhizosphere respiration to soil CO 2 efflux in a grass-dominated mountain fen in Germany. Soil CO 2 efflux was measured in three un-manipulated control plots and three flooded plots in two consecutive years. Flooding was achieved by permanent irrigation during the growing seasons. Radiocarbon signatures of CO 2 from different sources including soil CO 2 efflux, incubated peat cores and live grass roots were repeatedly analyzed for partitioning of soil CO 2 efflux. Additionally, heterotrophic respiration and its radiocarbon signature were determined by eliminating rhizosphere respiration in trenched subplots (only control). In the control plots, rhizosphere respiration determined by 14 C signatures contributed between 47 and 61 % during the growing season, but was small (4 ± 8 %) immediately before budding. Trenching revealed a smaller rhizosphere contribution of 33 ± 8 % (2009) and 22 ± 9 % (2010) during growing seasons.Flooding reduced annual soil CO 2 efflux of the fen by 42 % in 2009 and by 30 % in 2010. The reduction was smaller in 2010 mainly through naturally elevated water level in the control plots. A one-week interruption of irrigation caused a strong short-lived increase in soil CO 2 efflux, demonstrating the sensitivity of the fen to water table drawdown near the peat surface. The reduction in soil CO 2 efflux in the flooded plots diminished the relative proportion of rhizosphere respiration from 56 to 46 %, suggesting that rhizosphere respiration was slightly more sensitive to flooding than heterotrophic respiration.

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“…This is typical of most grassland, where gross and net photosynthesis are strongly correlated to green biomass (leaf area index) Li et al, 2005;Otieno et al, 2009;Beringer et al, 2011). Given that shoot N also peaked in the wet season, the combined increase in green biomass (photosynthetic surface area), shoot N and light utilization efficiency facilitated rapid CO 2 uptake resulting into the high GPP and NEE.…”

Section: Ecosystem Productivity and Carbon Fluxesmentioning

confidence: 83%

“…The chamber method whose results compare favourably with eddy data, when both are used in parallel (Li et al 2008) is useful in heterogeneous landscapes and when the focus is to separate fluxes from the different ecosystem patches. The chamber method has widely been used for CO 2 measurements in the temperate (Li et al 2008), Peatlands (Otieno et al 2009) and in the African savannah (Otieno et al 2010; ecosystems. We used the chamber method to measure the ecosystem CO 2 exchanges in the herbaceous layer of a moist African savannah.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Dynamics in Carbon Dioxide Flux Es of the Herbaceous Layer of a Moist Kenyan Savannah

K'Otuto¹

2014

Appl Ecol Env Res

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Responses of CO2 Exchange and Primary Production of the Ecosystem Components to Environmental Changes in a Mountain Peatland

Cited by 43 publications

References 39 publications

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Partitioning of soil CO<sub>2</sub> efflux in un-manipulated and experimentally flooded plots of a temperate fen

Seasonal Dynamics in Carbon Dioxide Flux Es of the Herbaceous Layer of a Moist Kenyan Savannah

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Responses of CO2 Exchange and Primary Production of the Ecosystem Components to Environmental Changes in a Mountain Peatland

Cited by 43 publications

References 39 publications

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Improved data gap-filling schemes for estimation of net ecosystem exchange in typical East-Asian croplands

Partitioning of soil CO&lt;sub&gt;2&lt;/sub&gt; efflux in un-manipulated and experimentally flooded plots of a temperate fen

Seasonal Dynamics in Carbon Dioxide Flux Es of the Herbaceous Layer of a Moist Kenyan Savannah

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Partitioning of soil CO<sub>2</sub> efflux in un-manipulated and experimentally flooded plots of a temperate fen