Effects of Planting Density on the Growth of Trees and Competing Vegetation in Young Sugi Plantations Treated with Different Weeding Methods

Noguchi Mahoko, Saitoh Tomoyuki, Sakai Atsushi, Aoyama Takehiko

doi:10.4005/jjfs.105.291

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下刈り方法の異なるスギ若齢林において植栽密度が植栽木と競合植生の成長に与える影響
シタガリホウホウノコトナルスギジャクレイリンニオイテショクサイミツドガショクサイモクトキョウゴウショクセイノセイチョウニアタエルエイキョウ

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Abstract

<p>Despite its valuable contribution to replanting cost reduction, low-density planting may lead to delayed canopy closure and interfere with tree growth. The effect of planting density on the growth of Sugi (Cryptomeria japonica (L.f.) D.Don) and competing vegetation, and their competitive status was examined in 4 young Sugi plantations with different weeding methods in the Tohoku district of Japan. We measured the height and crown width of the planted Sugi trees, the height of competing vegetation, and their competitive status with Sugi trees. Planting density negatively affected the crown width of Sugi in an 11-year-old stand under complete weeding, with improvement cutting at 10 years old, suggesting competition among planted trees. Despite the negative effect of planting density on the height of competing vegetation, Sugi trees were not covered with competing vegetation in plots with a lower planting density in this stand. However, a low planting density led to a small height and crown width of Sugi, and the large part of them was covered with competing vegetation in 6-7-year-old strip-weeded stands. These results indicate that when low-density planting was used with strip weeding, planted Sugi trees tended to be covered with competing vegetation that thrived in the area between the weeded rows.</p>

Journal

Journal of the Japanese Forest Society

Journal of the Japanese Forest Society 105 (9), 291-297, 2023-09-01

The Japanese Forest Society

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