句容林场摇铃口部分近20年生杉木林由于年久失管,杂草丛生,茅草尤为茂密,杉木生长极为不良,形成矮小、多头、黄瘦的“小老树”。近几年来采用人工垦复、除草等改造措施,对促进杉木生长已取得良好的效果。但这种办法花工多、成本高,第一年每亩需花15元左右的人工费,当年只能除去茅草80-90％,以后3-5年内,还需进行垦复间种,直至林木郁闭。我们为了探索在改造杉木“小老树”的过程中减少劳动力,降低成本的有效办法,进行了除草剂四氟丙酸钠灭草的试验。经过一年的观察,初步看到了一定的效果。现将试验情况与结果初报如下。 Jurong rattan part of the forest near the mouth of 20-year-old Chinese fir forest as a result of tube failure, overgrown weeds, particularly thatched thatch, extremely poor growth of the fir, the formation of short, long, thin yellow “small tree.” In recent years the use of artificial reclamation, weeding and other transformation measures to promote the growth of fir has achieved good results. However, this method takes more labor and costs are high. In the first year, it takes about 15 yuan per mu for artificial labor. In that year, it can only remove 80-90% of thatch grass. In the next 3-5 years, it needs to be reclaimed, Forest closed. In order to explore an effective way to reduce the labor force and reduce the cost in the process of rebuilding the “small old tree”, we conducted the experiment of weeding herbicide sodium tetrafluoropropionate. After a year of observation, initially saw a certain effect. Now the test results and the results reported below.