It is known that large amounts of organic halogens are present in soil, but the relative contribution from different sources is unclear. The aim of the present study was to determine the storage of organic halogens in a spruce forest soil and thedeposition by needle litterfall and to elucidate the relative contribution from needle litterfall in relation to other sources and sinks. Sampling was conducted in a small spruce forest area in Denmark. Soil samples were collected at six locations to adepth of 60 cm. Litterfall was collected in 15 sample collectors every third month during 1 year. Soil leachate was collected below the B{sub}h horizon over two periods of 5 days at five locations distributed over the study site. Throughfall data wascompiled from a previous study conducted at the same site and during the same period as the present study, and data concerning net formation in soil was estimated from previous studies at similar sites. The pool was 630 kg of Cl{sub}org ha{sup}-1,contribution from litterfall was 0.35kg ha{sup}-1 yr{sup}-1, and loss by leaching was 0.63 kg of Cl{sub}org ha{sup}-1 yr{sup}-1 (mean values). The estimated contributions from throughfall and net formation within the soil were 0.38 and 0.36 kg ofCl{sub}org ha{sup}-1 yr{sup}-1, respectively. The results suggest that the pool in the investigated soil originates mainly from sources within the forest and that it increases with time.
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