The influence of sucrose on soil nitrogen availability – A root exudate simulation using microdialysis
نویسندگان
چکیده
Root exudates are thought to promote nitrogen (N) availability via rhizosphere interactions, but empirical evidence is difficult obtain given the scale and temporary nature of these processes. Microdialysis has potential simulate root exudation patterns quantify effects on N simultaneously, this so far not been attempted. In a conceptual study, we used sucrose as simple C source investigate if microdialysis could detect continuous localised supply soil inorganic fluxes. Through retrodialysis released simultaneously monitored diffusive fluxes over one week, followed by further seven days without sucrose. Based current understanding dynamics, hypothesised that inversely related release, upon ceasing would increase. Using 5 mM perfusate, releases resulted in decreased fluxes, contrary our hypothesis, did increase after release (c.f. control soil). Diffusive efflux from probes increased soils amended with N-rich litter suggesting microbial activity associated consumption altered concentration gradients. The breakdown products glucose fructose were greatest treatments receiving sucrose, indicative invertase presence fresh organic matter. short term (days), prompt an availability, possibly because stimulated growth demand under C-rich conditions. Our study confirms allows time-sensitive insight into dynamic interactions carbon rhizosphere.
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ژورنال
عنوان ژورنال: Geoderma
سال: 2022
ISSN: ['0016-7061', '1872-6259']
DOI: https://doi.org/10.1016/j.geoderma.2021.115645