Shree K. Giri
Email: skg29@cornell.edu
Phone: 607-255-2463
Office: 72 Riley Robb Hall
Reserach Interests
Retention/release of phosphorus (P) from landscape to water
bodies is controlled by a complicated myriad of hydrological,
biogeochemical, and microbial processes. We are investigating
the roles of Dissolved Organic Carbon/Matter (DOC/DOM) on
P mobility in soils. We are particularly interested in the
humic fraction, which may facilitate P mobility through complexation
or by promoting chemical reduction (especially with respect
to iron), which may help liberate P. Both DOC generation (via
decomposition) and iron reduction are generally associated
with anaerobic conditions when soils are saturated, and thus
this project fits well within our hydrological research on
variable source area hydrology.
In essence, areas prone to saturation or saturation-cycles
are probably biogeochemical hotspots for P. Preliminary results
suggest that P-complexation with DOC and DOC-Fe complexes
may be an important avenue of P mobilization, although it
is difficult to separate these abiotic processes from biotic
processes like iron reduction. We are also expanding this
work to assess the possible effects of sulfate on the release
of P during anaerobic (saturated) soil conditions.
Recent Publications
Dicarlo, D. A.; Dathe, A.; Giri, S. K.;
Zevi, Y.; Steenhuis, T. 2004. Simultaneous in-situ measurements
of colloid concentration and water saturation using synchrotron
x-rays. American Geophysical Union, Fall Meeting 2004, abstract
#H23H-04. abstract
Flores-Lopez, F., L. D. Geohring, S. K. Giri and
T. S. Steenhuis. 2005. Phosphorus transport by monitoring
groundwater and interflow discharge in hydrologically sensitive
areas. Geophysical Research Abstracts, Vol. 7, 10153, 2005.
SRef-ID: 1607-7962/gra/EGU05-A-10153. abstract
Molodovskaya, M. S.; Singurindy, O.; Richards, B. K.; Giri,
S. K.; Steenhuis, T. S. 2005. Nitrous Oxide Emissions
From Livestock Waste Under Oxic and Anoxic Conditions. American
Geophysical Union, Fall Meeting 2005, abstract #B51A-0181.
abstract
Singurindy, O.; Molodovskaya, M.; Giri, S. K.;
Richards, B. K.; Steenhuis, T. S. 2005. Nitrogen Gaseous Emission
from Animal Based Agriculture: Effect of Soil Physical Properties.
American Geophysical Union, Fall Meeting 2005, abstract #B51A-0178.
abstract
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