Abstract:
Purpose : Small tanks/ reservoirs are one of the major components of dry zone landscape and they were the basis
of prosperity in ancient Sri Lanka. There are identified ecosystem components associated with the tanks such as
upper peripheral area (thaulla). It is useful to understand the role of hydrophytes in thaulla area scientifically.
This field study aimed to investigate the phytoextraction ability of two monocot plants, Paspalidium punctatum
and Cyperus rotundus naturally grown in thaulla area of Ulankulama tank located in Anuradhapura.
Research Method : The accumulation of total N, P, K, Ca, Mg, Cd, Pb and As were assessed by getting both plant and
soil samples from 20 sampling points in thaulla area. Total K, Ca, Mg, As, Cd, and Pb contents were measured using
the Inductivity Couple Plasma Optical Emission Spectrophotometer (ICP-OES) procedure. N, P, K were assessed
following standard analytical procedures.
Findings : Results showed that As and Cd were not observed in detected amount in soils of root zone of
the plants. However, As and Cd were present in shoots and roots in both plant species. Both species could
be considered as hyperaccumulator for K, Ca and Mg as they have biological concentration factor higher
than one.
Originality / Value : Paspalidium punctatum and Cyperus rotundus could be considered as hyperaccumulator
for K, Ca and Mg and bio accumulation of heavy metals in thaulla area.
