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以内蒙古毛乌素沙地沙柳(Salix psammophila)人工林为对象,对灌木林平茬预留盖度、留茬高度、平茬时间及平茬生产周期进行试验研究。结果表明:沙地沙柳造林后4~6a内应进行首次平茬复壮,进入丰产期后平茬周期以4a为宜,可收获最高的生物量。人工林下草本植被盖度达18%以上时,沙柳平茬的适宜预留盖度为10%;当林下草本盖度小于上述值或无草本层覆盖,平茬预留盖度应提高至20%左右,以防止引起地面风蚀。沙柳平茬适宜的留茬高度为5cm左右,可使其萌生生长能力最强。
In this paper, Salix psammophila plantations in the Mu Us desert of Inner Mongolia were used as experimental objects to study the stubble reserve, stubble height, stubble time and stubble production cycle of shrubs. The results showed that the first stubble and rejuvenation should be carried out within 4 to 6 years after the Salix psammophila forest was planted, and the best stubble cycle after entering the high yielding period was 4a, which could harvest the highest biomass. When the coverage of herbaceous vegetation in artificial forest is over 18%, the appropriate coverage of Salix psammophila is 10%. When the coverage of understory herb is less than the above value or no herb layer is covered, the reserve of stubble should be increased to 20% or so, in order to prevent causing wind erosion on the ground. Salix stubble suitable stubble height of about 5cm, can make it the strongest ability of initiation and growth.