Distribution and cycling of sulfur in deciduous and coniferous forest ecosystems as influenced by acidic deposition, 1: Distribution of biomass and sulfur.
1994
Sakuma T. | Tomita A. | Shibata H. | Tanaka Y.
The distribution of biomass and sulfur were determined for deciduous (Df) and coniferous (Cf) forests in a college experiment forest at Tomakomai (N. 42:40, E. 141:36) as the bases to study sulfur cycling in the forest ecosystems. The Df-forest consists mainly of Quercus mongolica var. grosserrata, Purnus sargentii, Acea mono, Tilia japonica, and other lower story broadleaved trees and its standing stock biomass (SSB) was estimated at about 240 Mg h(-1). The Cf-forest, on the other hand, was a young plantation of Pinus strohus and its SSB was about 90 Mg ha(-1). The highest sulfur content was observed in leaves for all the tree species followed by roots, branches, and trunks. The sulfur content of leaves varied in a wide range from 1 to 4 mg S g(-1) depending upon age and position of leaves and tree species. The amounts of accumulated sulfur in the upper story trees of Df- and Cf-forests were estimated at 75 and 33 kg S ha(-1), respectively. Most of the accumulated sulfur (ca. 54%) was partitioned to roots and stocks in Df-forests, but in Cf-forest about 55% of it was found in branches and leaves. The organic horizons of forest soils were a fairly big pool of sulfur in the ecosystems, especially for Cf-forest. Although sulfur contents of the mineral soil horizons were very low, the accumulated sulfur in soils amounted to about 600 kg S ha(-1) for upper 50 cm horizons. It was certain that the sulfur pool of mineral soil horizons plays an important role in controlling sulfur cycling of the forest ecosystems under consideration.
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