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《Scientia Silvae Sinicae》 2009-01
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Effects of Rhizosphere Microenvironment on the Root Vigor of Poplars and Transformation of Soil Available P

Liang Jun Wang Yuan Jiao Yijie Zhang Xingyao(Institute of Forest Ecology,Environment and Protection,CAF Key Lab.of Forest Protection of State Forestry Administration Beijing 100091)  
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%.
【Fund】: 国家科技支撑计划课题“商品林重大生物灾害防控技术研究”(2006BAD08A11);; 国家林业局重点项目“西部干旱半干旱生态脆弱区人工林病虫害生态管理技术试验”(2005-10);; 北京市科技计划项目“林业病虫害生物防治关键技术研究”(D0705002040191、D0705002040291)
【CateGory Index】: S792.11;S714
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