研究資料(Research Material)

京都府南部地方における広葉樹二次林の地上部現存量及び純生産量

後藤義明・小南裕志・深山貴文・玉井幸治 ・金澤洋一

Aboveground Biomass and Net Primary Production of a Broad-leaved Secondary Forest in the Southern Part of Kyoto Prefecture, Central Japan

GOTO Yoshiaki, KOMINAMI Yuji, MIYAMATakafumi, TAMAI Koji and KANAZAWAYoichi

Abstract
Aboveground biomass and net primary production were estimated in a broad-leaved secondary forest in the southern part of Kyoto Prefecture, central Japan. Forty-six sample trees and shrubs (3cm≦diameter at breast height (DBH) ), 11 sample shrubs (1cm ≦DBH< 3cm) and 24 sample lianas were cut near the study site to establish allometric relationships between size parameters and dry weights of stems, branches and leaves. DBH census was made for all trees, shrubs and lianas (1cm≦DBH) in the study site. The calculated aboveground biomass based on the allometric relationships and the DBH census was 105.05 t ha-1. Trees and shrubs (3cm≦DBH) occupied 92.2% of the total biomass. The aboveground net primary production for all trees and shrubs was estimated to be 15.84 t ha-1 yr-1, of which 94.0% as in the trees and shrubs (3cm≦DBH).

Key words : broad-leaved secondary forest, database of tree weights, allometric relationships, database of forest biomass and production

要 旨
京都府南部に位置する山城試験地において、広葉樹二次林の地上部現存量と純一次生産量を調査した。試験地周辺で胸高直径(DBH)3cm以上の林木を46本、DBH1cm以上3cm未満の低木を11本、つる植物を24本伐倒し、DBHや樹高と幹重、枝重、葉重等との相対成長関係を作成した。試験地内で胸高直径1cm以上の林木とつる植物を対象に毎木調査を行い、伐倒調査で作成した相対成長関係を試験地内の全林木とつる植物に適用して、地上部現存量と純一次生産量を求めた。当試験地の林木とつる植物の地上部現存量は105.05t ha-1と推定された。このうちDBH3cm以上の林木が全体の92.2%を占めていた。林木を対象に地上部純一次生産量を求めたところ15.84t ha-1 yr-1と推定され、このうちDBH3cm以上の林木が占める割合は94.0%であった。

キーワード:広葉樹二次林、毎木調査、伐倒調査、相対成長関係、地上部現存量、地上部純一次生産量

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