【摘要】 叶面喷施调节膦一次能在三年内显著地抑制灌木杂草的滋生,同时,目的树种——油松的生长得到了促进。在适宜剂量下,其高生长量增加25％,地径增加20％左右。就本林区所代表的植被类型而言,调节膦的用量以2.4公斤/公顷较为适宜。不论在五月底还是七月中旬喷药,均有明显效果。此外,用调节膦化控代替人工抚育,还能大幅度节约劳力,减少抚育费用。同时,该项措施能有效地保护植被,防止水土流失;该药品没有毒性,不污染环境。因此,作为一项新的幼林抚育技术,将在林业生产中具有宽广的前途。更多还原

【Abstract】 It could restrain the qrowth of many species of bushes and weeds, the multipli- cation of which competed with that of Pinus tabulaeformis, for about з years by the foliar application of Krenite, Ammonium ethyl carbamoylphosphonate. The heig- ht increment had increased by about 25％; the diameter 20％ with proper dosage, which comes to 2.4Kg/ha, for the type of forest floor of which Lespedeza bicolor. forsythia suspcusa, Carex duriuscola and Aster tripoliam constituted. The most suitable season meets from the end of May to the middle of July. Other advantages are as follows: preventing soil erosion, protecting the forest floor and environment, as it has no poisonousness. Economically, both expenses and labour power economized to a quite certain extent. The application of Krenite would have broad prospect in forest production.更多还原