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在荒山造林中,幼林抚育是一个非常突出的问题,由于幼树生长缓慢,它们常常因灌木杂草的滋生而受到压抑甚至死亡。调节膦在国外已广泛地用作灌木杂草的防除剂。为了探讨调节膦在林业生产中的应用途径,自1982年起,我们在河南的主要造林树种之一——油松幼林中,初步研究了在不同时期喷施不同浓度调节膦对灌木杂草的抑制效果。材料与方法试验地点在嵩县王莽寨林场,海拔1100～1230米,坡度35°左右。树种为人工栽培的五年生油松与迹地更新的栎类的混交林。油松平均高1米,栎树高4米。试验地的灌木杂草的复盖度为80％左右,其主要种类及分布密度见表1
In the afforestation of the barren hills, young forest tending is a conspicuous problem. Due to the slow growth of young saplings, they are often depressed or even died due to the breeding of shrubs and weeds. Phosphine has been widely used abroad as a shrub weed control agent. In order to explore the ways of regulating the application of phosphine in forestry production, we studied the application of different concentrations of phosphine to weeds in shrubs, one of the main afforestation species in Henan, Inhibitory effect. Materials and Methods The test site was located at Wangmaozhai Forest Farm in Song County, with elevation of 1100-1230 m and slope of 35 °. Tree species for the artificial cultivation of Pinus tabulaeformis and the updated oak mixed forest. Pinus tables average 1 meters high, 4 meters high oak trees. Test coverage of shrub weeds is about 80%, the main types and distribution density in Table 1