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Growth and nutrient dynamics of Betula alnoides seedlings under exponential fertilization

Journal of Forestry Research 2018年第1期29卷 111-119页

作者： Lin Chen Chunsheng Wang Bernard Dell Zhigang Zhao Junjie Guo Daping Xu Jie Zeng The Experimental Center of Tropical Forestry Chinese Academy of Forestry Research Institute of Tropical Forestry Chinese Academy of Forestry Division of Research and Development Murdoch University

Betula alnoides is a fast-growing hardwood species grown in large plantations in Southeast Asia and South *** requirements for producing robus seedlings,growth and nutrient dynamics were investigated using exponential fertilization *** collar diameter,height,dry mass and nutrient contents of seedlings increased exponentially in all fertilization treatments as time ***,with water soluble fertilizer（Plant Products plus microelements N–P2O5–K2O：20–20–20）,300 mg N seedling-1was *** analysis revealed that P was the most responsive nutrient element followed by N and *** of N and K were evident in the plants without N addition,which induced initial P sufficiency and then luxury consumption probably due to the antagonistic interaction between N and *** deficiencies of N,P and K were mostly observed in al exponential regimes during the experiment because seedling growth rate exceeded nutrient uptake rate,inferring that further study on improving the nutrient uptake efficiency is *** of relationships among nutrient supply,dry mass,N content and N concentration demonstrated that 100–400 mg N seedling-1induced sufficiency to luxury consumption of nitrogen without significant change in dry mass,and 400 mg N seedling-1is recommended to apply for nutrient loading of seedlings before *** findings will help improve seedling quality and enhance the production of robust seedlings for plantation forestry of this species.

关键词： Betula alnoides Growth performance luxury nutrient consumption Nitrogen requirement Vector analysis

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