文章基本信息

标题：列状間伐がヒノキ人工林の植生回復と表土流亡の抑止に及ぼす長期的影響
本地全文：下载
作者：渡邉仁志 ; 千村知博 ; 堤隆博等
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：2020
卷号：102
期号：6
页码：341-345
DOI：10.4005/jjfs.102.341
语种：Japanese
出版社：The Japanese Forest Society
摘要：列状間伐が下層植生の動態と表土流亡の抑止に及ぼす長期的な影響を明らかにする目的で，ヒノキ人工林を点状および列状（1伐2残，2伐4残，3伐6残）に伐採し，下層植生と地表面の状態を比較した.間伐後，短期的には伐列の光条件が向上し植被率が増加した.しかし，間伐後12年目の相対散乱光強度は3伐列のみが高く，その他の調査区では数年の間に低下した.3伐列は他の調査区より植被率やリター被覆率が高く，表土流亡の間接指標である土壌侵食危険度指数が低かった.また，土壌侵食危険度指数は，植被率やリター被覆率が高い調査枠で低い傾向がみられた.伐採幅に起因する光条件の違いによって，下層植生が維持されリターの移動が抑制されたため，3伐列では，両者による地表面の被覆により表土流亡が低減したと推測される.
其他摘要：To clarify the responses of undergrowth and surface soil erosion deterrence to line-thinning in a planted Japanese cypress (Chamaecyparis obtusa) stand, we set one scattered-thinning plot (ST) and three types of line-thinning plot, with one cutting row (1CR) and two remaining rows, two cutting rows (2CR) and four remaining rows, and three cutting rows (3CR) and six remaining rows. We also compared the condition of the undergrowth and the forest floor among the plots. The light conditions and vegetation cover increased in the short term after thinning in all plots. In contrast, the relative light scattering intensity decreased in ST, 1CR, and 2CR over several years, but remained high in 3CR at 12 years after thinning. The ratio of vegetation and litter cover was higher in 3CR than in the other plots. The soil erosion susceptibility index, which is an indicator of the relative risk of surface soil erosion, was lower only in 3CR, and tended to be lower with a higher ratio of vegetation and litter cover. We suspect that in 3CR, because of the improvement in light condition caused by the greater row width, restoration of the undergrowth constrained the movement of litter, which decreased surface soil erosion.
关键词：地表面被覆;土壌侵食危険度指数;光条件;ヒノキ人工林;列状間伐
其他关键词：forest floor coverage##Japanese cypress (Chamaecyparis obtusa) stand##light condition##line-thinning##soil erosion susceptibility index