文章基本信息

标题：天然秋田スギ個体の肥大成長に土壌深・土壌水分・光・隣接木との競争が与える影響
本地全文：下载
作者：井上みずき ; 石川雄一 ; 星崎和彦等
期刊名称：日本森林学会誌
印刷版ISSN：1349-8509
电子版ISSN：1882-398X
出版年度：2016
卷号：98
期号：3
页码：101-107
DOI：10.4005/jjfs.98.101
语种：Japanese
出版社：The Japanese Forest Society
摘要：資源減少に伴い，天然スギ林では立木ごとの個体管理が重要となってきている.そこで，およそ300年生の天然秋田スギが生育する仁鮒水沢スギ植物群落保護林において，1-ha 調査区を設定し，2006年と2010年に毎木調査を行い，スギの肥大成長速度を把握し，土壌深（A層とAB層の厚さの合計値）・土壌水分（体積土壌含水率）・光（樹冠の相対凹凸度）・隣接木との競争（立木周辺の他のスギ立木の胸高断面積（BA）合計密度）が成長速度へ及ぼす影響を明らかにした.スギの胸高直径（DBH）は80.4±25.3（平均±SD）cm，DBH 成長速度は0.18±0.21cm/year であった.観測された水分条件範囲の大部分で，土壌水分の増加に対し，DBH 成長速度は減少していると一般化線形モデルから推定された.本調査地では一部の立木が過湿状態に置かれている可能性があるが，土壌水分と連動する他の土壌養分の影響の可能性もあるので精査が必要である.さらに，隣接木のBA合計密度が成長に負の影響を与える傾向にあったことから混み合った状態で隣接したスギと土壌水分以外の光や養分獲得の競争が起きている可能性もある.
其他摘要：Individual tree-based management in natural forests becomes more important in managing old growth Japanese cedar (Cryptomeria japonica) stands because of the decline of timber resources from natural forests. We set a 1-ha study plot in Nibuna-Mizusawa Forest Reserve, Akita, northern Japan, which mainly consisted of about 300-year-old Japanese cedars. The individual growth of tree diameter at breast height (DBH) was calculated using censuses in 2006 and 2010. The effects of soil depth (summed value of A and AB layers) , soil moisture, light conditions of the tree crown (relative concavity and convexity levels against the surrounding) , and neighborhood competition (indicated by sum of basal area of neighboring trees around each tree) were examined by generalized linear models. The mean DBH growth rate was 0.18±0.21 cm/year. The DBH growth rate decreased with increasing soil moisture within most values for soil moisture we observed. The tendency in our results suggested that some cedars grew worse in damp soils, although other unknown soil factors associated with soil moisture (e.g. nutrients) should also been examined. The effect of the neighboring trees was marginally negative, suggesting competition for soil nutrient and/or light. The processes leading to the presented patterns were discussed.
关键词：スギ;土壌水分;成長速度;個体間競争
其他关键词：Cryptomeria japonica;soil moisture;growth rate;intraspecific competition