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芽孢杆菌与植物生长调节剂在苔藓结皮种源扩繁中的作用
王清玄1,2, 鞠孟辰3, 卜崇峰1,3
1.中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100;2.中国科学院大学, 北京 100049;3.西北农林科技大学 水土保持研究所 陕西 杨凌 712100
摘要:
[目的] 研究芽孢杆菌与植物生长调节剂对苔藓结皮生长发育的影响,为提高苔藓结皮种源扩繁效率提供科学依据。[方法] 选择芽孢杆菌(胶质芽孢杆菌/巨大芽孢杆菌)与生长调节剂(噻苯隆)2种因素,设计双因素完全试验,观测温室条件下苔藓结皮的覆盖度、株高度和株密度。[结果] ①只添加胶质芽孢杆菌处理的苔藓生长状况最优,相比对照组(未添加芽孢杆菌及生长调节剂)分别提高了苔藓覆盖度(+18.9%)、株高度(+0.85 mm)和株密度(+15.44株/cm2);②添加巨大芽孢杆菌能提高苔藓株密度(+5.76株/cm2),但会减小其株高度(-0.78 mm),对盖度则无显著影响;③生长调节剂TDZ减小了苔藓植物覆盖度(-11.78%)、株高度(-3.33 mm),对株密度影响不显著;④芽孢杆菌与生长调节剂存在交互作用,巨大芽孢杆菌+TDZ处理增大了苔藓株密度(+9.79株/cm2),且高于只添加巨大芽孢杆菌处理(+3.67株/cm2),胶质芽孢杆菌+TDZ处理增加苔藓株密度(+4.3株/cm2)但弱化了胶质芽孢杆菌的促进作用(-11.14株/cm2)。[结论] 功能性微生物与生长调节剂对苔藓结皮生长发育具有显著影响,在今后苔藓结皮种源扩繁实践中应加以考虑和借鉴。
关键词:  苔藓结皮  种源扩繁  芽孢杆菌  生长调节剂  生长发育
DOI:10.13961/j.cnki.stbctb.2019.05.023
分类号:S157.9;S154;S184
基金项目:国家重点研发项目课题“边坡工程安全防控与生态还绿技术”(2017YFC0504703);国家重点研发国际合作项目“人工促进生物土壤结皮快速固沙技术”(2016YFE0203400-05);杨凌示范区产学研用协同创新重大项目“生物结皮的种源扩繁与生态综合护坡技术产业化(2017CXY-08)”(2017CXY-08);中央高校优秀青年科研业务专项基金项目“人工培育苔藓结皮的关键影响因子”(2014YQ006)
Effects of Bacillus and a Plant Growth Regulator for Provenance Propagation of Moss Biocrusts
Wang Qingxuan1,2, Ju Mengchen3, Bu Chongfeng1,3
1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract:
[Objective] The effects of Bacillus and a plant growth regulator on the growth and development of moss biocrusts were studied in order to provide a scientific basis for improving the provenance propagation efficiency of moss biocrusts.[Methods] A two-factor complete experiment was designed to observe the coverage, height, and density of moss biocrusts under greenhouse conditions by selecting Bacillus(B. mucilaginosus/B. megaterium) and growth regulator (Thidiazuron, TDZ) as the two variables.[Results] ① The growth status was optimal after the addition of B. mucilaginosus, which increased the coverage (+18.9%), height (+0.85 mm), and density (+15.44 strains/cm) compared to the control group (no Bacillus and growth regulator). ② After the addition of B. megaterium, the density of moss biocrusts increased (+5.76 strains/cm2); however, the height decreased (-0.78 mm) and the coverage was not significantly changed. ③ Treatment with TDZ reduced the coverage (-11.78%) and height (-3.33 mm); however, it had no significant effect on the density of moss biocrusts. ④ The growth status of BSC was significantly affected by the interaction of Bacillus and TDZ. The combination treatment of B. megaterium and TDZ increased the density of moss biocrusts (+9.79 strains/cm2) and was higher than that of the treatment where only B. megaterium was added (+3.67 strains/cm2). Additionally, the combined treatment of B. mucilaginosus and TDZ increased the density of moss biocrusts (+4.3 strains/cm2); however, it weakened the positive effect of B. mucilaginosus (-11.14 strains/cm2).[Conclusion] The effects of functional microorganisms and a growth regulator on the growth and development of moss biocrusts are very significant, which should be considered during the practice of provenance propagation of moss biocrusts.
Key words:  moss biocrusts  provenance propagation  Bacillus  growth regulator  growth and development