Rhizosphere processes influencing decomposition of soil organic matter and its contribution to phosphorus cycling
EMSL Project ID
50047
Abstract
Using multi-technique approach, including a combination of NMR and ultra-high resolution mass spectrometry at EMSL, the overall objective of this study is to determine how P availability and speciation influence plant root exudate-induced, microbe-mediated decomposition and mineralization (i.e. rhizosphere priming) of soil organic matter (SOM). The study will identify the primary physical and biogeochemical processes affecting the transformation, movement and storage of P (specifically organic P (Po)) in managed and natural ecosystem providing information to help better predict how management practices (conservation tillage, cover cropping, etc.) influence C, N, and P cycling. Three exudates differing in their mode of action (microbial C-source, microbial C and N source, metal chelate i.e., glucose, alanine, and oxalic acid, respectively) will be introduced to two soils differing in P availability and speciation (dominated by Po vs. inorganic P (Pi)) and their influence on P cycling. The specific aims of the proposed study are: 1) Determine the physical and biogeochemical processes influencing Po mineralization in soils with high and low P availability, and with different P speciation (Po dominated vs. Pi dominated). 2) Determine how root exudate composition (glucose, alanine, and oxalic acid) influences P mobilization (via mineralization and solubilization) in soils with high and low P availability and different P speciation (Po dominated vs. Pi dominated).
Project Details
Project type
Exploratory Research
Start Date
2017-11-03
End Date
2018-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members