杉木林不同抚育间伐强度试验效应初报

本试验建立12块标准地,设立四种间伐强度(处理)—0％(作为对照)、31％(中度间伐)、46％(强度间伐)、64％(极强度间伐),每种处理三次重复。1980年至1984年调查了定期内的胸径、树高、冠幅、林分材积、林分蓄积量等生长指标,结果表明:采取强度间伐所获得的效应最佳,它促使单株立木材积生长量和单位面积株数两因子的配合状况优良,林分蓄积量居高;并能提高林分中,大径材的比重;生产更多更好的木材,显著提高经济效益。

A Preliminary Experiment Report about Effect of Different Intensity of Thinning out Chinese-fir Stand

Twelve sample plots and four sorts of intensity of thinning out-that is, 0% (con trast)、31% (middle). 46% (strength) and 64% (more strength)wcrc designed in this cxpcri ment. Three repetitions were required in each intensity. In the prescribed time, during 1980-1984, the different effects about the chest-height diameter of trees, height, crown, stand volume growth, stand storage and so forth were investigated, Tt has been proved that the best effect was obtained by the strength intensity of thinning out. The effect was that it promoted a good combination of two factors between the standing volume growth and the individual plant number per umit area. Therefore, the stand storage of strength intensity is the maximum. It acn also increase the proportion of middle and large wood and produce more and better timber. As a result, the economic effect is raised rapidly.