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The Ingrowth Bag Method in Measuring Root Production on Peatland Sites

Finér, L. and Laine, J. (Finnish Forest Research Institute, Joensuu Research Station, P.O. Box 68, FIN-80101 Joensuu, Finland, and Department of Forest Ecology, Unioninkatu 40B, P.O. Box 24, FIN-00014 University of Helsinki, Finland). The ingrowth bag method in measuring root production on peatland sites. Received October 12, 1998. Accepted February 18, 1999. Scand. J. For. Res. 15: 75–80, 2000. Root production was measured with the ingrowth bag method on two pristine and three drained mire sites of different fertility in southern Finland during 1993–1995. The sites were selected among those where root production had also been measured with other methods. Root biomass on the drained sites started to increase clearly only during the second growing season, whereas on the pristine sites the ingrowth of roots began during the first summer after the installation of the bags in spring. This suggested a slower ingrowth rate of Scots pine (Pinus syl6estris L.) and dwarf shrub roots than of herbs and Cyperaceous species, which were more dominant on the pristine sites. The ingrowth bag method gave results comparable to the sequential coring method for the fine-root production (diameterB2 mm) on the drained sites within 2–3 yrs after installation of the bags, whereas on the pristine site the estimate for total root production (diameter510 mm) was significantly lower than that obtained with the C turnover method.