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为了塔里木沙漠公路防护林持续稳定的发展,对防护林内衰退的乔木状沙拐枣进行不同留茬高度和不同灌水量的平茬实验,选取萌蘖条数、株高、冠幅、萌蘖条地径、地上生物量5项指标评价平茬效果。结果表明:1)平茬后乔木状沙拐枣的萌芽期推迟10天左右,但萌蘖株的生长势明显好于未平茬植株,合理的留茬处理更能促进这一优势的发挥。2)平茬当年,不同留茬高度处理萌蘖株月生长动态一致,即株高、冠幅和地径均呈“S”型增长,而萌条数呈对数增长,但留茬高度对萌蘖条生长状况和地上生物量积累及分配均有显著影响(P<0.05),不同留茬高度平茬效果为:10cm>20cm>15cm>5cm。3)灌水量引起的土壤水分状况的差异极大的影响着防护林内乔木沙拐枣的平茬效果,单次灌水量45L/株的平茬效果明显好于22.5L/株。
In order to maintain the sustainable and stable development of shelterbelts in Tarim Desert Highway, the stubble experiment with different stubble height and different irrigation amount was carried out on the decayed shrubs in the shelterbelts. The numbers of sprout, plant height, crown, Diameter, aboveground biomass 5 indicators to evaluate stubble effect. The results showed that: 1) The arbuscular mycorrhizal turnip age was postponed about 10 days after stubble, but the growth potential of the stubble was obviously better than that of the uncut stubble, and the stubble treatment could promote this advantage. 2) In the same year of stubble, the monthly growth dynamics of different stubble height-treated sprouts were consistent, that is, the plant height, crown width and diameter were all “S ” type, while the numbers of stubble increased logarithmically, Height had a significant effect on the growth status and aboveground biomass accumulation and distribution (P <0.05). The stubble height at different stubble height was 10cm> 20cm> 15cm> 5cm. 3) The difference of soil water condition caused by irrigation quantity greatly affected the stubble effect of arborvitae arborvitae in the shelter forest. The single stubble irrigation 45L / plant stubble was significantly better than 22.5L / plant.