林业科学Issue(10)：158-163,6.DOI:10.11707/j.1001-7488.20141022
氮素形态对香榧苗期光合作用、主要元素吸收及氮代谢的影响
Effects of Nitrogen Forms on Foliar Photosynthesis,Nutrient Status and Nitrogen Metabolism of Torreya grandis Seedlings
摘要
Abstract
In this study,we measured the photosynthetic rate,the contents of primary inorganic elements,and nitrate reductase activity and leaf N content of Torreya grandis seedlings subjected to different inorganic nitrogen treatments. The results showed that the nitrogen forms and the ratio had significant impact on the photosynthetic rate,N,P,K content, and the nitrate reductase ( NR) activity of T. grandis seedlings. With the mixture of NH4 +-N and NO3 --N at the ratio of 1:1 and 3:1,the photosynthetic rate,and stomatal conductance (Gs) and transpiration rate (Tr) were significant higher compared to plants fed with sole NH4 +-N or NO3 --N. However,there were no different significances in intercellular CO2 concentration (Ci) among the different inorganic nitrogen treatments. The sole NH4 +-N and NO3 --N fed plants had lower phosphorus ( P ) and potassium ( K ) content than that treated with mixed nitrogen of NH4 +-N and NO3 --N. Plants supplied with both forms of N ( NH4 +-N /NO3 --N =25/75 and 50/50 ) had higher NO3 - content and NR activity in comparison to the plants only fed with NO3 --N. Compared to the plants fed with NH4 +-N or NO3 --N alone,significant higher N content was observed in the plants fed with mixture of NH4 +-N and NO3 --N ( NH4 +-N /NO3 --N =50/50 and 25/75). It is concluded that Torreya grandis seedlings have no obvious preference to NH4 +-N or NO3 --N. The mixture of NH4 +-N and NO3 --N at the ratio of 1∶1 is able to boost the photosynthesis,nutrients absorption and nitrogen metabolism of T. grandis seedlings.关键词
硝态氮/铵态氮/氮代谢/香榧Key words
nitrate nitrogen/ammonium nitrogen/nitrogen metabolism/Torreya grandis分类
农业科技引用本文复制引用
唐辉,李婷婷,沈朝华,胡渊渊,吴家胜..氮素形态对香榧苗期光合作用、主要元素吸收及氮代谢的影响[J].林业科学,2014,(10):158-163,6.基金项目
国家科技部星火重大项目(2012GA700001) （2012GA700001）
浙江省农业新品种选育重大科技专项(2012C12904－12) （2012C12904－12）
浙江省产业科技创新团队项目(2009R50033－20) （2009R50033－20）
浙江农林大学人才启动项目(2013FR063)。 （2013FR063）
