摘要
在温室内采用不同氮形态配比的营养液,水培研究9个马大杂种相思(Acacia mangium×A.au-riculiformis Cunn.ex Bench)无性系幼苗的生长状况,结果表明,NO3-∶NH4+值对马大相思生长及生物量的影响均达到极显著水平。当NO3-∶NH4+为25∶75时,马大相思幼苗的苗高、生物量干质量及生物量鲜重积累均达到最大。而NO3-∶NH4+为75∶25时,根长净生长量最大,但抑制了苗高的生长;在供氮总量不变的条件下,NO3-∶NH4+为25∶75时最有利于马大杂种相思幼苗的生长。
The effect of nitrogen forms on the growth of Acacia mangium×A.auriculiformis Cunn.ex Bench young seedlings was studied with the method of water culture in greenhouse.The results were that the effect of different proportion of NO3-and NH4＋ to the growth and the biomass of 9 clones had an extremly significant level.Under different forms of N,seedlings height net growth was the highest while the proportion of NO3^-∶NH4^＋ was 25∶75.While the proportion of NO3^-∶NH4^＋ was 75∶25,the root would have the highest net growth.In the fact of the biomass,when the proportion of NO3^-∶NH4^＋ was 25∶75,the seedlings′dry biomass and fresh biomass accumulation would be the highest.Therefore,under confession nitrogen all quantity is invariant condition,the young seedling grown best when the proportion of NO3-and NH4＋ was 25∶75.
出处
《广东林业科技》
2010年第4期18-23,共6页
Forestry Science and Technology of Guangdong Province
基金
国家"十一五"林业科技支撑计划:高产优质相思速生材新品种选育(2006BAD01A1505)
国家"十一五"林业科技支撑计划:桉树和相思速生丰产林培育关键技术研究与示范(2006BAD24B0202)
广东林业科技创新专项:优质
速生相思无性系选育研究与示范(2009KJCX006)
关键词
马大相思
NO3-∶NH4+
生长
生物量
Acacia mangium×A.auriculiformis Cunn.ex Bench
the proportion of NO3-∶NH4＋
growth
biomass
