The importance and place of the photosynthetic carbon sequestration in the organic branch of its global cycle

Voronin, P. Yu.; Black, Clanton C.

doi:10.1007/s11183-005-0011-z

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In recent years, the carbon balance estimate for Russian territory was of interest for experts since it plays an important role in global carbon cycling. The baseline estimations (relating to 1990) of total NPP and MF for Russian terrestrial ecosystems amounted to 4.41 (Voronin and Black, 2005) and 2.78 Pg C yr −1 , respectively (Kurganova, 2003). Non‐soil sources of CO 2 (fossil fuel, forest fires and diseases, debris decomposition, agricultural, timber and peat extraction, etc.)…”

Section: Resultsmentioning

confidence: 99%

Updated estimate of carbon balance on Russian territory

Kurganova

Kudeyarov

Gerenyu

2010

Tellus B: Chemical and Physical Meteorology

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A B S T R A C TThe land use system in Russia changed considerably after 1990: 30.2 million ha of croplands were abandoned. Based on the own field investigations that were carried out in abandoned lands of different age (Luvic Phaeozems, deciduous forest zone; Moscow region, 54 • 50 N, 37 • 37 E), it has been shown that after 4-5 yr of abandonment, the former croplands acted as a stable sink of CO 2 . The net ecosystem production (NEP) in the post-agrogenic ecosystems averaged 245 ± 73 g C m −2 yr −1 for the first 15 yr after land use change that corresponds to an estimated 74 ± 22 Tg C yr −1 for the total area of abandoned lands in Russian Federation. Currently, the Russian territory acts as an absolute sink of atmospheric CO 2 at a rate about 0.90 Pg C yr −1 . Using three different approaches, it was demonstrated that after 1990, the carbon sequestration in Russian soils (0-20 cm layer) has averaged 34 ± 2.2 Tg C yr −1 . This soil C forms net biome production (NBP) where carbon lifetime is much longer than in 'Kyoto forests'. Thus, the post-agrogenic ecosystems in Russia provide with the additional CO 2 sink in NEP and NBP that could annually compensate about 25% of the current fossil fuel emissions in the Russian Federation.

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Section: Resultsmentioning

confidence: 99%

Updated estimate of carbon balance on Russian territory

Kurganova

Kudeyarov

Gerenyu

2010

Tellus B: Chemical and Physical Meteorology

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“…The rates of phytomass degradation and carbon return to the atmosphere depend on the conditions and form of organic matter deposition. Soil carbon is the major continental reservoir of long-term (about thousand years) of organic matter deposition [2]. Hence, the study of conditions and mechanisms of replenishment of this reservoir is of principal significance for solving the problem of the capability of plant canopy to sequester the excess of atmospheric carbon in the soil layer.…”

Section: Introductionmentioning

confidence: 99%

Prolonged Growth of Young Spruce (Picea koraiensis Nakai) Plants at Double Atmospheric CO2 Concentration Stimulates the Preferential Growth of Thick Roots

Wang

Zhu

et al. 2005

Russ J Plant Physiol

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Two-year-old young spruce ( Picea koraiensis Nakai) plants were grown in a climatic chamber during three summer months at double atmospheric CO 2 concentration, sufficient content of soil inorganic nitrogen, and diurnal variation of temperature and illuminance, which simulate natural growth conditions. The control plants were grown in another climatic chamber under the same conditions, but at atmospheric CO 2 concentration (350 ppm). CO 2 exchange was measured with a Li-Cor 6400 infra-red gas analyzer in attached leaves placed in a climatic chamber in the morning under growth conditions and saturating light 1200 µ E/(m 2 s) in June, July, and August. In addition, dry weights of needles, leafless shoot parts of plant, fraction of thick (more than 0.5 mm in diameter) and thin (less than 0.5 mm in diameter) roots were recorded. The data were used to plot CO 2 exchange rates as a function of carbon dioxide concentration and to calculate the increment of shoot and root phytomass. The maximum gas exchange rates in the treated and control plants similarly depended on CO 2 concentration. The slope of the CO 2 dependence curve, which corresponded to the kinetic characteristic V m / K M of photosynthetic carboxylation, increased monotonically during the experiment. To the end of observation period, the proportion of thick roots in plant phytomass significantly increased in the plants grown at double atmospheric CO 2 concentration, as compared to the control plants. Thus, the increase in the rate of photosynthetic gas exchange in plants grown for three months at double atmospheric CO 2 concentration was only due to the increase in CO 2 , the substrate of Rubisco carboxylation activity. We found no differences in the ëé 2 characteristic for Rubisco between the treated and control plants. The ratio of needle to thin roots in the treated and control plants was similar and did not change during the experiment. The excess of photoassimilates in the treated, as compared to the control plants, was preferentially used for thick root growth. This result shows that photosynthesis in young spruce forests can deposit excess atmospheric CO 2 in the soil horizon in the form of thick root phytomass.

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