油松幼林中喷施调节膦与人工抚育效果的比较研究

在以往小区对比试验的基础上,将调节膦的最佳剂量(2.4公斤/公顷)在5公顷左右面积的油松幼林中进行中间试验,并对喷药与人工抚育的效果作了比较。小区试验中所观察到的喷施调节膦后连续三年灌木杂草受抑制,灌木杂草的复盖度降低及油松生长量增加等现象,在本试验中得到了重复。同时也证明,人工抚育所能有效地控制灌木杂草的时间要比喷施调节膦短得多。在人工抚育后二个月,灌木杂草的复盖度即从30%上升为70%,到次年五月上升为90%。此外喷药后油松高生长的增加量亦比人工抚育的要大得多。这些结果为今后林业生产中大规模地采用调节膦进行幼林抚育提供了依据。

COMPARATIVE STUDIES ON THE EFFECTS OF SPRAYING FOSAMINE WITH THE MANUAL CULTURE IN PINUS TABULAFFORMIS YOUNG FOREST

On the basis of previous plot experiments,the fosamine,using the best dosage (2.4Kg/ha),was applied in about 5 ha of Pinus Tabulaeformis young forest, and its effects were compared with manual culture. It was observed that soraying fosamine could restrain the growth of many species of bushes and weeds,decreased their coverdegree,and increased the growth of pines.It was discovered that the effective time to control the bushes and weeds with manual culture was shorter than the application of fosamine.After two monthes of manual culture the cover degreeofbushes and weeds had in creased from 30% to 70%,and to 90% in next May. Besides,the height increament of pines sprayed with fosamine was greater than the manual culture obyiously. All these results offered the basis for the application of fosamine in forest production in big scale in the future.