Productivity of Young Stands of Metasequoia glyptostroboides

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  • 若いメタセコイア林分の物質生産量について
  • ワカイ メタセコイアリン ブン ノ ブッシツ セイサンリョウ ニ ツイテ

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Abstract

1) The authors have dealt with some investigations on the forest production of two stands of Metasequoia glyptostroboides (deciduous needle-leaved sequoias) in Yamaguchi Prefecture (lat. N 34°, Long. E 132°, Alt. ca. 30 m). The summary of some of the quantitative characteristics of the two stands are shown on Table 1. Stand 1 and Stand 2 were near each other and the site quality of the stands were about the same. The tree heights of Stand 1 were from 5.6 m to 10.7 m, but those of Stand 2 were very uniform; more than 75% of the trees were 8-9m high. The investigation was carried out for about one week in September, 1967. 2) Biomass and biomass increase were estimated after allometric and other relation (Table 1) were calculated. These relations were as follows; [Table omitted] The biomass of stem, branches and leaves, and the stem increment obtained in both stands corresponded closely with each other, in spite of the differences of tree sizes. 3) Leaf biomass (5 ton/ha; 4 ton/ha excluding branchlets) or stem biomass per one meter (ys/H¯; 4.5ton/ha･m, 14m3/ha･m) agree very well with those of the larch forests4)8). The accumulation of stem biomass is approximately two times the rate in larch forests having the same tree density, because the mean annual height growth (about 1.2 m/yr) of Stand 1 and 2 was very vigorous. Branch increment of Stand 1 was estimated at 3.8 ton/ha･yr (9.9m3/ha･yr), and this corresponds to 50% of the branch biomass and to 46% of the stem increment. 4) The volume of stem produced by 1 kg of leaves (oven dry weight) was 1.7-2. 3kg/kg by the dominant trees and 1.1-1.2 kg/kg in the case of the suppressed trees. 5) Net primary production (⊿Pn) of Stand 1 was calculated as [Figure omitted] For the items in this fomula (Table 3) the numerical values in Table 1 were used for the most part. But Y2N of bark was calculated as; [Figure omitted] 6) Net primary production in Stand 1 was estimated at 21 ton/ha･yr. This is nearly equal to that of larch forests1), or all other forest types excluding the deciduous broad-leaved forests1). 7) The amount of the nutrients in this forest were 61.96 ton/ha of dry matter, 279.6 kg/ha of nitrogen, ●42.2 kg/ha of phosphorus, 187.1 kg/ha of potassium, 393.5 kg/ha of calcium, and 34.0 kg/ha of magnesium.

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