我场次生林区山高、坡长、较陡。相对高差100—200米,坡长300—500米,坡度都在20°以上。近年来采用松江—50型拖拉机集材,其好处是:①集材效率较高,比人工集材提高效率5—10倍;②节省人力,减轻了劳动强度;③便于制材,在集材场造材,比在陡坡上造材安全;④有利于合理造材,提高了大材的利用率;⑤适应范围较广,坡度22°以下的山坡都可使用,亩出材1立方米以上的皆伐区,采用该机集材能收到良好的效果。根据该机的性能,结合本区的实际情况,我们的做法如下:一、集材道的设计在伐区工艺设计的同时,要进行集材道的设计,做好集材的准备作业。1.选线:20°以下的山坡或者山沟, My secondary forest mountain high, long slope, steep. Relative elevation 100-200 meters, slope length 300-500 meters, the slope is more than 20 °. In recent years, the use of the Songjiang -50 tractor skid, the benefits are: ① higher skidding efficiency than the artificial skid to improve efficiency 5-10 times; ② save manpower and reduce labor intensity; ③ easy to timber, in the skid Field construction, than in the steep slope of the material safety; ④ is conducive to rational timber, improve the utilization of large timber; ⑤ wide range of adaptation, the slope of 22 ° below the hill can be used, mu out of more than 1 cubic meter Clearcut area, using the machine can receive good results. According to the performance of the aircraft, combined with the actual situation in this area, our approach is as follows: First, the design of the timber Road Cutting process design at the same time, to conduct the design of the timber Road, do a good job of gathering timber. 1 line: 20 ° below the hillside or ravine,