Soil organic matter mineralization and residue decomposition of spring wheat grown under elevated CO2 atmosphere

Marhan, Sven; Demin, D. V.; Erbs, Martin; Kuzyakov, Yakov; Fangmeier, Andreas; Kandeler, Ellen

doi:10.1016/j.agee.2007.04.001

Cited by 27 publications

(11 citation statements)

References 17 publications

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“…In this study, the lack of the response of microbial biomass to elevated CO 2 can not be explained by N‐limitation, because the N fertilizers were applied in equal amounts to each plot under ambient and elevated CO 2 treatments (Erbs & Fangmeier, 2006). Probably, in spite of higher plant biomass under elevated CO 2 reported for the same FACE experiment (Marhan et al , 2008) the harvest of spring wheat induced lower plant residue inputs to the soil, thus leveling the indirect effect of elevated atmospheric CO 2 on the increase of microbial biomass. Moreover, we observed no changes in microbial biomass under elevated vs. ambient CO 2 in isolated soil aggregates.…”

Section: Discussionmentioning

confidence: 85%

Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size

Dorodnikov

Blagodatskaya

Blagodatsky

et al. 2009

Global Change Biology

203

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Increased belowground carbon (C) transfer by plant roots at elevated CO 2 may change properties of the microbial community in the rhizosphere. Previous investigations that focused on total soil organic C or total microbial C showed contrasting results: small increase, small decrease or no changes. We evaluated the effect of 5 years of elevated CO 2 (550 ppm) on four extracellular enzymes: b-glucosidase, chitinase, phosphatase, and sulfatase. We expected microorganisms to be differently localized in aggregates of various sizes and, therefore analyzed microbial biomass (C mic by SIR) and enzyme activities in three aggregate-size classes: large macro-(42 mm), small macro-(0.25-2 mm), and microaggregates (o0.25 mm). To estimate the potential enzyme production, we activated microorganisms by substrate (glucose and nutrients) amendment. Although C total and C mic as well as the activities of b-glucosidase, phosphatase, and sulfatase were unaffected in bulk soil and in aggregate-size classes by elevated CO 2 , significant changes were observed in potential enzyme production after substrate amendment. After adding glucose, enzyme activities under elevated CO 2 were 1.2-1.9-fold higher than under ambient CO 2 . This indicates the increased activity of microorganisms, which leads to accelerated C turnover in soil under elevated CO 2 . Significantly higher chitinase activity in bulk soil and in large macroaggregates under elevated CO 2 revealed an increased contribution of fungi to turnover processes. At the same time, less chitinase activity in microaggregates underlined microaggregate stability and the difficulties for fungal hyphae penetrating them. We conclude that quantitative and qualitative changes of C input by plants into the soil at elevated CO 2 affect microbial community functioning, but not its total content. Future studies should therefore focus more on the changes of functions and activities, but less on the pools.

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Section: Discussionmentioning

confidence: 85%

Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size

Dorodnikov

Blagodatskaya

Blagodatsky

et al. 2009

Global Change Biology

203

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“…The soil was described as a Gleyic Cambisol (WRB, 1998) developed from Loess (Marhan et al, 2008). The uppermost 10 cm of the A p horizon were sampled for this study.…”

Section: Samplesmentioning

confidence: 99%

Source determination of lipids in bulk soil and soil density fractions after four years of wheat cropping

2010

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“…Field crops in particular have received considerable attention, with most research scenarios including a doubling of the atmospheric carbon dioxide concentration (Bertrand et al 2007;Kim et al 2007;Marhan et al 2008) and/or a temperature increase by 2 • C or more (Estrella et al 2007;Krishnan et al 2007;Xiao et al 2007), reflecting the most likely future climate estimates proposed by the Intergovernmental Panel on Climate Change (IPCC 2007) and other climate modeling efforts. Field crops, such as maize (Zea mays L.), wheat (Triticum aestivum L.) and rice (Oryza sativa L.) are by far the largest contributors to meeting the food energy demands of a growing human population.…”

Section: Introductionmentioning

confidence: 99%

Climate change effects on winter chill for tree crops with chilling requirements on the Arabian Peninsula

2009

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Fruit production systems that rely on winter chill for breaking of dormancy might be vulnerable to climatic change. We investigated decreases in the number of winter chilling hours (0-7.2 • C) in four mountain oases of Oman, a marginal area for the production of fruit trees with chilling requirements. Winter chill was calculated from long-term hourly temperature records. These were generated based on the correlation of hourly temperature measurements in the oases with daylength and daily minimum and maximum temperatures recorded at a nearby weather station. Winter chill was estimated for historic temperature records between 1983 and 2008, as well as for three sets of synthetic 100-year weather records, generated to represent historic conditions, and climatic changes likely to occur within the next 30 years (temperatures elevated by 1 • C and 2 • C). Our analysis detected a decrease in the numbers of chilling hours in high-elevation oases by an average of 1.2-9.5 h/year between 1983 and 2008, a period during which, according to the scenario analysis, winter chill was sufficient for most important species in most years in the highest oasis. In the two climate change scenarios, pomegranates, the most important tree crop, received insufficient chilling in 13% and 75% of years, respectively. While production of most traditional fruit trees is marginal today, with trees barely fulfilling their chilling requirements, such production might become impossible in the near future. Similar developments are likely to affect other fruit production regions around the world.

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Soil organic matter mineralization and residue decomposition of spring wheat grown under elevated CO2 atmosphere

Cited by 27 publications

References 17 publications

Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size

Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size

Source determination of lipids in bulk soil and soil density fractions after four years of wheat cropping

Climate change effects on winter chill for tree crops with chilling requirements on the Arabian Peninsula

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Soil organic matter mineralization and residue decomposition of spring wheat grown under elevated CO2 atmosphere

Cited by 27 publications

References 17 publications

Stimulation of microbial extracellular enzyme activities by elevated CO2 depends on soil aggregate size

Stimulation of microbial extracellular enzyme activities by elevated CO2 depends on soil aggregate size

Source determination of lipids in bulk soil and soil density fractions after four years of wheat cropping

Climate change effects on winter chill for tree crops with chilling requirements on the Arabian Peninsula

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Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size

Stimulation of microbial extracellular enzyme activities by elevated CO₂ depends on soil aggregate size