摘 要:以盆栽毛白杨、北京杨为试验材料,采用均匀设计,将外生菌根真菌(美味牛肝菌、褐疣柄牛肝菌)、植物生长调节剂(NAA)和植物抗病诱导剂(水杨酸)以不同配比混合形成根际微生态调节物,并施于苗木根部,研究其对苗木生长、生物量、根系活力、土壤酸性磷酸酶活性及土壤有效P的影响效应。结果表明:根际微生态调节物改善了苗木根际微生态环境,使毛白杨、北京杨盆栽苗的苗高、地径、总干质量均有较大幅度的提高,分别比对照增加16.0%~35.0%,19.4%~38.9%,15.5%~86.4%和12.5%~26.2%,1.6%~20.3%,33.6%~72.7%,幼苗生长更为健壮和迅速;使毛白杨根系活力比对照提高6.71%~33.64%,北京杨根系活力比对照提高1.49%~49.46%,根系活力与苗木的生长、生物量有较大相关性; 使毛白杨和北京杨根际土壤酸性磷酸酶活性增强,分别增加20.91%~36.35%和13.39%~54.98%,对根际区域的土壤有效P具有明显的富集效应,富集率分别为7.49%~25.67%和17.85%~53.50%。
Abstract: Potted Populus tomentosa and Populus × beijingensis cuttings were used to study the effect of root coupling agents, which consisted of two ectomycorrhizal fungi, plant growth regulator and plant resistance inducer with uniform design, on the cuttings growth,biomass,root vigor,soil acid phosphatase activity and soil available P around root area. The results showed that the height, the ground stem diameter and the total dry mass of the treated Populus tomentosa and Populus × beijingensis cuttings were increased by 16.0%~35.0%,19.4%~38.9%,15.5%~86.4% and 12.5%~26.2%,1.6%~20.3%,33.6%~72.7%, respectively in compared with the control. The root vigor of the treated Populus tomentosa and Populus × beijingensis cuttings were 6.71%~33.64% and 1.49%~49.46% higher than those of the control, respectively. There was a close correlationship between root vigor and biomass of cuttings. The coupling agents greatly increased the soil phosphatase activity and the increase was 20.91%~36.35% and 13.39%~54.98% respectively in the treated Populus tomentosa and Populus × beijingensis the rhizosphere. The coupling agents also enhanced the transformation of available P from insoluble P minerals, and the soil available P enriched in the rhizosphere of treated Populus tomentosa and Populus × beijingensis cuttings respectively with 7.49%~25.67% and 17.85%~53.50%.
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