Not AvailableEutrophication level in lakes and reservoirs
depends on both internal and external phosphorus
(P) load. Characterization of sediment P
fractionation and identifying the P pollution sources
are important for assessing the bio - availability of P
and the dominant P source, for effectively controlling
the water pollution. For determining the availability
and sources of sediment P and eutrophication status,
spatio - temporal variation in different P fractionation
of sediment of hyper - eutrophic Krishnagiri reservoir,
Tamil Nadu, India, was investigated. Sediment average
total P (TP) content ranged from 4.62 to 5.64 g/kg.
Main phosphorus form was the inorganic P (IP), and it
makes up to 73.4–87.7% of TP. Among the different P
fraction, viz. calcium bound (Ca - P), iron bound (Fe–
P), aluminium bound (Al - P), exchangeable (Ex - P) and
Organic - P (Org - P), Ca - P was the dominating fraction
in both IP and TP. Trend of IP fraction was as follows:
Ca - P[Fe–P][Al - P][Ex - P] in pre - monsoon season,
Fe–P[Ca - P][Al - P][Ex - P] in monsoon and Ca -
P[Al - P][Fe–P][Ex - P] in post - monsoon. Overall the trend was as follows Ca - P[Fe–P][Al - P][Org -
P][Ex - P]. Bio - available - P (BAP) fractions ranged
from 35.2 to 64.0% of TP, indicating its comparative
higher value. Pearson’s correlation matrix revealed
that there was strong correlation among the different P
fractions. Factor analysis indicates that different
fractions of P were the dominating factor than the
other sediment parameters. The observed variation in
sediment P fractionation indicate the differences in
source and characterization of P which is very helpful
for implementation of effective management practices
in controlling pollution that arises due to phosphorus
in this hyper - eutrophic reservoir.Not Availabl
