Inside the black box

Article Abstract:

It has been established that, in two grasslands exposed to carbon dioxide at twice the ambient concentration, carbon cycles through the systems more rapidly, but accumulation does not increase much. It appears that the net increase in carbon intake seen in the short term probably does not indicate the potential for long-term carbon storage in grasslands. This research raises doubts about the ability of the California grasslands to sequester much additional carbon, but is not necessarily relevant for other ecosystems.

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Net transfer of carbon between ectomycorrhizal tree species in the field

Article Abstract:

It has been possible to produce direct evidence for both bidirectional and net carbon transfer between plant species. This research, which used the ectomycorrhizal tree species Betula papyrifera and Pseudotsuga menziesii, demonstrated the occurrence of both hyphal and soil pathways and source-sink regulation of net transfer in field conditions. The 3% to 10% net transfer from B. papyrifera to P. menziesii is a significant carbon gain by P. menziesii.

Soils, Soil carbon

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A quickening on the uptake?

Article Abstract:

The net CO2 uptake fluctuates in the global land biosphere, the North American land biosphere and the oceans. The land biosphere is the main cause of the fluctuations. The El Nino events play a significant role in the fluctuations. Variations in the imbalance between photosynthesis and respiration vary by land biosphere. The imbalances with the gross fluxes of about 100 Gt C/yr result in climatic changes.

Environmental aspects, Observations, El Nino, El Nino Current, Biosphere

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