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《Journal of Beijing Forestry University》 2009-03
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Effects of root age on biomass and leaf nutrition in tetraploid Robinia pseudoacacia.

ZHANG Guo-jun~1;LI Yun~1;LI Fang-ping~2;XU Zhao-he~1;SUN Yu-han~1.1 Key Laboratory for Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education,College of Biological Sciences and Biotechnology,Beijing Forestry University,100083,P.R.China;2 Forestry Investigation & Planning Administrative Office,Nanyang City,Henan Province,473056,P.R.China.  
This study was conducted to assess the impact of root age on biomass and leaf nutrition in tetraploid Robinia pseudoacacia.Results indicated that plant height,base diameter,branch/leaf,gross weight and leaf weight of new sprout increased with root age.The total gross and leaf weight of the 3-year-old plant was 1 138 and 637 g at root age 3,respectively.The plant height,branch/leaf,gross weight and leaf weight increased with tree age,and the gross weight,which amounted to 2 230 g at tree age 3,was significantly higher than that of new sprouts with a root age of 3.But the leaf weight of the 3-year-old tree was only 603 g,lower than that of new sprouts with root age 3.In addition,the amount of crude protein in leaves of new sprout was 225.45 g/kg,which was significantly larger than those of new sprout in 2 years root age,new sprout in 3 years root age,three-year-stem in 4 years root age and four-year-stem in 5 years root age(P0.01).However,there were no significant differences among new sprout with a root age of 2,new sprout with root age 3,three-year-stem with root age 4 and four-year-stem in 5 years root age(P0.05).However,leaf crude protein of these plants was higher than 178.75 g/kg.The amount of Ca in leaves was significantly affected by root age(P0.01),and increased with root age.The amount of ether extract,crude ash,P and tannin in leaves was not significantly affected by root age(P0.05).Overall,the data show that tetraploid R.pseudoacacia forage forest should be cut at age 2 and develop cultivated coppice to maximize biomass and plant nutrition.
【Fund】: 国家林业局林业科学技术推广项目(2003-5-2);; 国家林业局重点科研项目(2004-04)
【CateGory Index】: S792.27
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