TOC Fluctuations In Subsoil Water And A Seepage Lake
Author(s)
A. Tõnisson
Abstract
A. Tõnisson
Tartu University, Estonia
Abstract
During four seasons, in a pine-forested sloping watershed, subsoil water from
calcareous soil and sandy soil was collected on 20 occasions. In total 8
lysimeters were used. No clear relationship has been found between total organic
carbon (TOC) concentrations, precipitation nor runoff. Percolation of subsoil
water into lakes is highly seasonal, occurring primarily in spring and autumn.
However, the total contribution of subsoil water into lakes is very limited. The
annual estimated flux of TOC past the depth 15 cm below the forest floor under
conifers was up to 650 kg/ha. The total emission of TOC from the transitional
humus-rich test site was higher by up to 10 times as compared with the sandy
site. Hence, particular soils represent large stores of C, which, due to the local
water table is not completely available for the adjacent lake. In the case of
seepage lakes the flux of carbon does not reach into the lake directly. However,
water exchange w
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