Comparative ecosystem&amp;#x2013;atmosphere exchange of energy and mass
                        in a European Russian and a central Siberian bog II. Interseasonal and
                        interannual variability of CO&lt;sub&gt;2&lt;/sub&gt; fluxes

Arneth, Almut; Kurbatova, Juliya; Kolle, Olaf; Shibistova, Olga; Lloyd, Jon; Vygodskaya, N. N.; Schulze, Ernst Detlef

doi:10.3402/tellusb.v54i5.16684

Cited by 46 publications

(76 citation statements)

References 26 publications

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“…above referenced publications), and we therefore divide the measured ecosystem-atmosphere exchange of CO 2 (NEE) into its component fluxes assimilation (A) and respiration (R). In case of the Siberian ecosystems, Arrhenius-type relationships of measured night-time NEE (=R) with soil temperature were established, and by using these, R were extrapolated to daylight hours (Lloyd and Taylor, 1994;Arneth et al, 2002a;Shibistova et al, 2002). In the Mopane woodland, ecosystem respiration rates were frequently confined by soil moisture rather than by temperature.…”

Section: Methodsmentioning

confidence: 99%

“…To calculate daily sums, gaps were filled using a respiration-temperature function for night-time values (see below) and a hyperbolical relationship with quantum flux density (Q) during daytime hours. The shape of the correction functions was plastic and parameter values varied throughout the year in response to seasonal changes observed in assimilation and respiration (Arneth et al, 2002a;Tchebakova et al, 2002;Veenendaal et al, 2004).…”

Section: Methodsmentioning

confidence: 99%

“…Eddy flux calculations were performed online but were later corrected to account for flux losses due to the gas-analysers' imperfect performance in the high-frequency domain, or dampening of the signal while air was travelling along the tube (O. Kolle, unpublished;Eugster and Senn, 1995;Arneth et al, 2002a;Lloyd et al, 2002;Röser et al, 2002;Tchebakova et al, 2002;Veenendaal et al, 2004). The half-hourly fluxes thus derived were screened, and corrected for possibly dubious values encountered during stable conditions at night by applying a stationarity test or a u*-threshold, with the thresholds being: >0.2 ms −1 at the birch forest, >0.1 ms −1 at the Mopane woodland, 0.055 at the wetland, and >0.15 ms −1 at the pine forest (Arneth et al, 2002a;Lloyd et al, 2002;Röser et al, 2002;Veenendaal et al, 2004).…”

Section: Methodsmentioning

confidence: 99%

“…Maximum leaf area of this nearly monospecific forest was 2.6 by late August. A more detailed description of the three ecosystems can be found elsewhere (Arneth et al, 2002a;Lloyd et al, 2002;Röser et al, 2002;Tchebakova et al, 2002).…”

Section: Boreal Forests and Wetlands Central Siberiamentioning

confidence: 99%

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Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

et al. 2006

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Abstract.We compare assimilation and respiration rates, and water use strategies in four divergent ecosystems located in cold-continental central Siberia and in semi-arid southern Africa. These seemingly unrelated systems have in common a harsh and highly seasonal environment with a very sharp transition between the dormant and the active season, with vegetation facing dry air and soil conditions for at least part of the year. Moreover, the northern high latitudes and the semi-arid tropics will likely experience changes in key environmental parameters (e.g., air temperature and precipitation) in the future; indeed, in some regions marked climate trends have already been observed over the last decade or so.The magnitude of instantaneous or daily assimilation and respiration rates, derived from one to two years of eddy covariance measurements in each of the four ecosystems, was not related to the growth environment. For instance, respiration rates were clearly highest in the two deciduous systems included in the analysis (a Mopane woodland in northern Botswana and a Downy birch forest in Siberia; >300 mmol m −2 d −1 ), while assimilation rates in the Mopane woodland were relatively similar to a Siberian Scots pine canopy for a large part of the active season (ca. 420 mmol m −2 d −1 ). Acknowledging the limited number of ecosystems compared here, these data nevertheless demonstrate that factors like vegetation type, canopy phenology or ecosystem age can override larger-scale climate differences in terms of their effects on carbon assimilation and respiration rates.By far the highest rates of assimilation were observed in Downy birch, an early successional species. These were achieved at a rather conservative water use, as indicated by relatively low levels of λ, the marginal water cost of plant Correspondence to: A. Arneth (almut.arneth@nateko.lu.se) carbon gain. Surprisingly, the Mopane woodland growing in the semi-arid environment had significantly higher values of λ. However, its water use strategy included a very plastic response to intermittently dry periods, and values of λ were much more conservative overall during a rainy season with low precipitation and high air saturation deficits. Our comparison demonstrates that forest ecosystems can respond very dynamically in terms of water use strategy, both on interannual and much shorter time scales. But it remains to be evaluated whether and in which ecosystems this plasticity is mainly due to a short-term stomatal response, or alternatively goes hand in hand with changes in canopy photosynthetic capacity.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Boreal Forests and Wetlands Central Siberiamentioning

confidence: 99%

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Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

et al. 2006

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“…At the Tura site, however, the winter CO 2 flux based on chamber measurements was shown to represent a negligible proportion of the annual flux (41). The Zotino site data for the nongrowing-season carbon fluxes were obtained by extrapolating the shortterm nongrowing-season measurement (42). For the YC, HZ, and DXAL sites, we estimated that the nongrowing-season fluxes were ∼40% of the growing-season fluxes based on the nearby Laoshan sites.…”

Section: Methodsmentioning

confidence: 99%

High carbon dioxide uptake by subtropical forest ecosystems in the East Asian monsoon region

Zhi

Piao

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

468

226

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Temperate-and high-latitude forests have been shown to contribute a carbon sink in the Northern Hemisphere, but fewer studies have addressed the carbon balance of the subtropical forests. In the present study, we integrated eddy covariance observations established in the 1990s and 2000s to show that East Asian monsoon subtropical forests between 20°N and 40°N represent an average net ecosystem productivity (NEP) of 362 ± 39 g C m −2 yr −1 (mean ± 1 SE). This average forest NEP value is higher than that of Asian tropical and temperate forests and is also higher than that of forests at the same latitudes in EuropeAfrica and North America. East Asian monsoon subtropical forests have comparable NEP to that of subtropical forests of the southeastern United States and intensively managed Western European forests. The total NEP of East Asian monsoon subtropical forests was estimated to be 0.72 ± 0.08 Pg C yr −1 , which accounts for 8% of the global forest NEP. This result indicates that the role of subtropical forests in the current global carbon cycle cannot be ignored and that the regional distributions of the Northern Hemisphere's terrestrial carbon sinks are needed to be reevaluated. The young stand ages and high nitrogen deposition, coupled with sufficient and synchronous water and heat availability, may be the primary reasons for the high NEP of this region, and further studies are needed to quantify the contribution of each underlying factor.

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Assessing CO₂ sink/source strength of a degraded temperate peatland: atmospheric and hydrological drivers and responses to extreme events

Evrendilek

2014

Ecohydrology

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Monthly mean sink/source strength pattern of a degraded temperate peatland in northwestern Turkey was quantified using the eddy covariance technique between July 2010 and February 2014. Atmospheric and hydrological drivers and responses to extreme events of sink/source strength were analysed using multiple linear regression models, support vector machine, multilayer perceptron with principal component analysis and multiple comparisons following general linear models. On the basis of the three full‐year measurements, mean annual, growing season and maximum estimates of net ecosystem CO2 exchange (NEE) were −0.22 mg CO2 m−2 s−1, −0.28 mg CO2 m−2 s−1 and −0.11 mg CO2 m−2 s−1 in July, respectively. The main driver of changes in monthly mean NEE pattern was found to be latent heat flux. Independent validation results showed a similar predictive performance (r2 = 74%) of multiple linear regression and support vector machine models as a function of month, total rainfall, water table depth, relative humidity, latent heat, atmospheric water vapour, wind direction and downwelling shortwave radiation. A shift in NEE from a net sink to a net source was observed in response to the deepest and shallowest water table depths due to drought and flooding, respectively. Copyright © 2014 John Wiley & Sons, Ltd.

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Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO<sub>2</sub> fluxes

Cited by 46 publications

References 26 publications

Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

High carbon dioxide uptake by subtropical forest ecosystems in the East Asian monsoon region

Assessing CO₂ sink/source strength of a degraded temperate peatland: atmospheric and hydrological drivers and responses to extreme events

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Comparative ecosystem&#x2013;atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO<sub>2</sub> fluxes

Cited by 46 publications

References 26 publications

Water use strategies and ecosystem-atmosphere exchange of CO&lt;sub&gt;2&lt;/sub&gt; in two highly seasonal environments

Water use strategies and ecosystem-atmosphere exchange of CO&lt;sub&gt;2&lt;/sub&gt; in two highly seasonal environments

High carbon dioxide uptake by subtropical forest ecosystems in the East Asian monsoon region

Assessing CO2 sink/source strength of a degraded temperate peatland: atmospheric and hydrological drivers and responses to extreme events

Contact Info

Product

Resources

About

Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO<sub>2</sub> fluxes

Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

Water use strategies and ecosystem-atmosphere exchange of CO<sub>2</sub> in two highly seasonal environments

Assessing CO₂ sink/source strength of a degraded temperate peatland: atmospheric and hydrological drivers and responses to extreme events