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- Fleischer, Siegfried, 1938-
(författare)
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Interaction between N and C in Soil has Consequences for Global Carbon Cycling
- 2012
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Ingår i: Journal of Resources and Ecology. - Beijing : Science Press. - 1674-764X. ; 3:1, s. 16-19
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Tidskriftsartikel (refereegranskat)abstract
- Energy—yielding processes in the N—cycle form important links with the global C—cycle. One example is demonstrated with the supply of nitrogen to soils, initially resulting in lowered CO2 emissions. This well known effect has mostly been interpreted as hampered or delayed soil respiration. When added in surplus, however, nitrogen supply does not stabilize the minimum emissions initially obtained, but gradually results in increased CO2 emissions. Specific inhibition of the CO2 consuming process nitrification in soils, with surplus ammonium supply or with acetylene, mostly results in additional CO2 emissions. The difference between this disclosed gross heterotrophic respiration (GHR) and the net CO2 emission (NHR) is the result of a within—soil CO2—sink. Soil respiration solely determined as CO2 emitted as NHR (the common situation) therefore may lead to misinterpretations of the function of the soil system, especially in areas with high N—deposition. As a consequence, the interpreted ‘acclimation’ of the soil respiration response in a warmer world should be reconsidered. The concept of respiration inhibition by nitrogen supply may also be questioned. Disregard of these processes, including the indicated N—driven within—soil CO2—sink, may prevent adequate measures counteracting climate change.
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| 2. |
- Mattsson, Marie, 1960-, et al.
(författare)
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Catch Crop Known to Decrease N-leaching also Counteracts Soil CO2 Emissions
- 2015
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Ingår i: Journal of Resources and Ecology. - Beijing : Zhongguo Kexueyuan Dili Kexue yu Ziyuan Yanjiusuo / Chinese Academy of Sciences, Institute of Geographical Sciences and Natural Resources Research. - 1674-764X. ; 6:3, s. 180-185
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Tidskriftsartikel (refereegranskat)abstract
- CO2 emissions to the atmosphere were studied in a fertilized sandy agricultural soil with and without a catch crop sown into the main crop. The catch crop was grown primarily with the purpose to decrease N-leaching but this study also wanted to find out if the catch crop could have an effect in a climate change perspective. Plots with catch crop showed decreased CO2 emissions from the soil. Since previous results have shown that catch crops effectively decrease N-leaching we recommend growing catch crops as an effective measure for helping both the climate and the eutrophication issue. Seasonal variations in CO2 emissions were pronounced with maximum emissions from the fertilized agricultural soil in June and from an adjacent unmanaged grassland in August. From the plot with catch crop emissions decreased in July and August but somewhat increased later in the autumn. Fertilized agricultural soil showed a within-soil CO2 sink after harvest, i.e. within-soil CO2 uptake. Availability of NH4+ or NO3- in the soil seems to influence the within-soil CO2 sink, with NH4+ enforcing the sink while the same amount of NO3- instead increased CO2 emissions. © 2015 BioOne All rights reserved
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