Traditional nursery culture of Changbai larch (Larix olgensis Henry) in Northeast China requires up to a 2-year nursery production period. The high cost of seedling culture for this duration has been identified as a constraint. As a potential means to help to shorten the cultural
period, we evaluated growth, biomass accumulation, and nitrogen (N) uptake dynamics of 1-year-old seedlings subjected to nutrient-loading treatments at intensive rates of 500 mg N seedling−1 supplied exponentially (E500) and 135 mg N seedling−1 supplied exponentially
(E135) or conventionally (constant). Also included were an unfertilized control and the standard fertilizer regime for 2-year-old seedling production (77 mg N seedling−1 supplied conventionally over 2 years). At the end of nursery culture, though seedlings in the constant
treatment had more biomass and N accumulation at the whole-seedling level, much of this was allocated to needles. While seedlings in the E500 treatment exhibited signs of toxicity, those in the E135 treatment had equivalent end-of-nursery N concentration in woody tissues to those produced
over 2 years; root collar increment and survival 69 d after outplanting were also similar. Our results suggest that exponential nutrient loading at an optimal rate could increase available nutrient reserves in woody tissues of deciduous tree seedlings, therefore having the potential to improve
seedling performance after outplanting.
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Document Type: Research Article
Province-Ministry Co-construct Key Laboratory of Forest Silviculture and Conservation, Ministry of Education, Beijing Forestry University, Beijing, China
Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, USA
Department of Forestry Research, Jilin Provincial Academy of Forestry Sciences, Changchun, China
Publication date: 2013-07-01
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