对美国俄克拉何马州东南部欧乌切达山的森林生境内栽植的火炬松苗木,用除草剂和机械松土预备处理,能增加其高生长和直径生长。与对照处理相比较,经2个生长季节后,松土处理的总苗高增加约10%,除草剂处理的增加23%,用除草剂并结合松土处理的,总苗高增加49%,而且这3种处理的地径增长率分别为20%、55%和83%。同 Loblolly pine seedlings planted in forest habitats in the Ouwo Cheda Hills, southeastern Oklahoma, USA, were treated with herbicides and mechanical loosening to increase their height growth and diameter growth. Compared with the control treatment, after 2 growing seasons, the total seedling height increased by about 10%, the herbicide treatment increased by 23%, the herbicide combined with the loose soil treatment, the total seedling height increased by 49% And the growth rates of these three treatments were 20%, 55% and 83% respectively. with