The purpose of this paper was to clarify the effects of vegetation and mulch on the soil temperature under the same leaf area index （LAI） conditions （LAI＝1.0）, but with different vegetation structures. Under the same LAI condi¬tions, the soil temperature at 6:00 a.m. in non‒mulched plots was higher when plant coverage was higher. In mulched plots, the soil temperature was higher when plant coverage was lower. In non‒mulched plots at 15:00, the soil tem¬perature was higher when plant coverage was lower. The same tendency was also observed in mulched plots. The soil temperature differences depending on vegetation structures were smaller in plots with lower plant coverage. This tendency was particularly obvious in mulched plots. As for the combined effects of the mulch and vegetation, mulch obviously affected the soil temperature. Mulched vegetation almost constantly suppressed the soil temperature.

本実験では，マルチ栽培の植被とマルチが地温に及ぼす影響を，同一葉面積指数(LAI＝1.0)条件下における植被構造の違いから明らかにすることを目的とした．
同一LAI下において，6時地温の無マルチ下では植被率が大きいほど高地温となった．マルチ下では植被率が小さいほど高地温となった．15時地温の無マルチ下では，植被率が小さいほど高地温となり，マルチ下でも同じ傾向となった．植被率が小さいほど植被構造の違いによる地温差は小さく，マルチ下では特に顕著となった．マルチと植被の複合効果では，マルチの地温効果が顕著にみられ，植被による地温上昇の抑制はマルチ被覆によって期間を通してほぼ一定となった．