New cog in the nitrogen cycle

Article Abstract:

The release of dissolved organic nitrogen (DON) is mediated by a pine, through the production of polyphenols in leaf litter, showing the major role of DON in the terrestrial nitrogen cycle. The study by R.R. Northup and associates suggests a novel explanation for plant secondary chemistry in natural, nitrogen-poor environments. Northup disputes the generalized nitrogen cycle through mineralization and subsequent oxidation, indicating that plants in nitrogen-poor environments do not need the mineralization step before absorbing nitrogen.

Soils, Pine, Pines, Soil nitrogen, Nitrogen cycle

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The fate of carbon in grasslands under carbon dioxide enrichment

Article Abstract:

Elevated carbon dioxide boosts carbon partitioning to roots, according to research undertaken on naturally occurring annual grasslands in central coastal California. Higher carbon dioxide was found to substantially boost carbon pools in roots, surface detritus and soil microorganisms in the sandstone grassland. There was a 37% rise in the total amount of carbon in these carbon pools. The shift in partitioning is mainly seen as a rise in root exudation and respiration. It is therefore very hard to detect.

Atmospheric carbon dioxide

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The roots of the matter

Article Abstract:

A new technique has been developed for obtaining an integrated estimate of the proportion of soil respiration gained from roots and their symbiotic mycorrhizae. This work showed a large proportion of carbon allocation below ground and tight integration among all plant processes.

Carbon cycle (Biogeochemistry), Carbon cycle

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