Biochemistry of Carbon and Nitrogen in the Siberian Afforestation Experiment

Vedrova, Ė. F.

doi:10.1007/1-4020-3447-4_17

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…4c and d). This result is supported by the findings of Vedrova (2005), who reported that the amount of C stored in roots was higher in evergreen conifers than in hardwoods. The low planting density of poplar plantations also might explain the lower root C stocks.…”

Section: Article In Presssupporting

confidence: 92%

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Zeng

Fan

et al. 2008

Journal of Arid Environments

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Section: Article In Presssupporting

confidence: 92%

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Zeng

Fan

et al. 2008

Journal of Arid Environments

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“…Given that 1 kg of CH 4 equals 23 kg of CO 2 during a 100‐year time scale (IPCC, 2001) and accounting for the mass of C in CO 2 (0.2727), the maximum difference in carbon equivalent methane consumption after afforestation is 12.5 kg C ha −1 yr −1 . This is a negligible amount compared with carbon storage in woody biomass: the average for all tree species annual biomass accumulation at the Siberian afforestation experiment is near 4000 kg C ha −1 yr −1 (Vedrova, 2005). Assuming that our measurements of CH 4 consumption are representative for the entire 35‐year afforestation period, we can conclude that reduced CH 4 oxidation under forest offsets the total carbon gain of afforestation by only 0.3%.…”

Section: Discussionmentioning

confidence: 99%

Changing land use reduces soil CH₄ uptake by altering biomass and activity but not composition of high‐affinity methanotrophs

Menyailo

Hungate

Abraham

et al. 2008

Global Change Biology

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Forest ecosystems assimilate more CO 2 from the atmosphere and store more carbon in woody biomass than most nonforest ecosystems, indicating strong potential for afforestation to serve as a carbon management tool. However, converting grasslands to forests could affect ecosystem-atmosphere exchanges of other greenhouse gases, such as nitrous oxide and methane (CH 4 ), effects that are rarely considered. Here, we show that afforestation on a well-aerated grassland in Siberia reduces soil CH 4 uptake by a factor of 3 after 35 years of tree growth. The decline in CH 4 oxidation was observed both in the field and in laboratory incubation studies under controlled environmental conditions, suggesting that not only physical but also biological factors are responsible for the observed effect. Using incubation experiments with 13 CH 4 and tracking 13 C incorporation into bacterial phospholipid fatty acid (PLFA), we found that, at low CH 4 concentrations, most of the 13 C was incorporated into only two PLFAs, 18 : 1x7 and 16 : 0. High CH 4 concentration increased total 13 C incorporation and the number of PLFA peaks that became labeled, suggesting that the microbial assemblage oxidizing CH 4 shifts with ambient CH 4 concentration. Forests and grasslands exhibited similar labeling profiles for the high-affinity methanotrophs, suggesting that largely the same general groups of methanotrophs were active in both ecosystems. Both PLFA concentration and labeling patterns indicate a threefold decline in the biomass of active methanotrophs due to afforestation, but little change in the methanotroph community. Because the grassland consumed CH 4 at a rate five times higher than forest soils under laboratory conditions, we concluded that not only biomass but also cell-specific activity was higher in grassland than in afforested plots. While the decline in biomass of active methanotrophs can be explained by site preparation (plowing), inorganic N (especially NH 4 1 ) could be responsible for the change in cell-specific activity. Overall, the negative effect of afforestation of upland grassland on soil CH 4 uptake can be largely explained by the reduction in biomass and to a lesser extent by reduced cell-specific activity of CH 4 -oxidizing bacteria.

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“…For the boreal forest, we used the values of k 0i given by (Vedrova, 1995(Vedrova, , 2005), which were averaged for all the species and all the taiga types considered. For the temperate grassland, we used averaged values of k 0i of roots and aboveground parts of herbaceous plants measured in temperate latitudes taken from (Bontti et al, 2009).…”

Section: Fitting Of Model Calculated Som Distributionsmentioning

confidence: 99%

Quantitative description of vertical organic matter distribution in real soil profiles by means a simple continuous model

Барцев

Pochekutov

2017

Ecological Modelling

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Previously we have proposed a continuous model of soil organic matter (SOM) transformation which was based on describing only the most general notions of this process -a gradual increase in SOM stability toward transformation, occurring concurrently with partial decomposition of SOM. The model provided qualitative description of vertical SOM distributions in different soils. In the present study this model has been modified to make the description more realistic. The study demonstrates quantitative correspondence between the calculated and averaged observed vertical distributions of SOM for different biomes.

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Biochemistry of Carbon and Nitrogen in the Siberian Afforestation Experiment

Cited by 13 publications

References 2 publications

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Changing land use reduces soil CH₄ uptake by altering biomass and activity but not composition of high‐affinity methanotrophs

Quantitative description of vertical organic matter distribution in real soil profiles by means a simple continuous model

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Biochemistry of Carbon and Nitrogen in the Siberian Afforestation Experiment

Cited by 13 publications

References 2 publications

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in the southeastern Keerqin Sandy Lands, China

Changing land use reduces soil CH4 uptake by altering biomass and activity but not composition of high‐affinity methanotrophs

Quantitative description of vertical organic matter distribution in real soil profiles by means a simple continuous model

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Changing land use reduces soil CH₄ uptake by altering biomass and activity but not composition of high‐affinity methanotrophs