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Biomass and Nutrients Variation of Chinese Fir Rooted Cuttings under Conventional and Exponential Fertilization Regimes of Nitrogen

1
State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin’an 311300, China
2
School of Environmental and Resources Science, Zhejiang A&F University, Lin’an 311300, China
3
Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Lin’an 311300, China
*
Author to whom correspondence should be addressed.
Forests 2019, 10(8), 615; https://doi.org/10.3390/f10080615
Received: 11 June 2019 / Revised: 14 July 2019 / Accepted: 21 July 2019 / Published: 25 July 2019
(This article belongs to the Section Forest Ecophysiology and Biology)
Exponential fertilization has been regarded as an important technique for improving seedling quality at the initial plant-growth stage. In our study, containerized one-year-old Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) rooted cuttings were reared at four nitrogen (N) fertilizer levels (0, 0.5, 1.0, 2.0 g cutting−1 season−1) under two topdressing methods (conventional and exponential) for a 210-day greenhouse rotation to evaluate growth and nutrient loading capacity of seedlings. N fertilizer was applied 20 times at an interval of 10 days during the study period. The results indicated that the schedule and rate of fertilization significantly affected the height, ground diameter, and biomass of Chinese fir rooted cuttings. The nitrogen concentration of different plant organs followed the order of leaves > root > stem. Compared to the CK, the N concentrations in root, stem, and leaves increased by 39.6%, 16.6%, and 41.1% in the conventional fertilizer treatment, and by 22.6% to 81.4%, 27.3% to 152.6%, and 73.6% to 135.5% in exponential fertilization treatments, respectively. The N concentrations of root, stem, and leaves of Chinese fir rooted cuttings under EF2 (1.0 N g cutting−1) were significantly higher than that of conventional fertilization (p < 0.05). However, there was no significant difference of phosphorus and potassium concentrations among different plant organs. Steady-state nutrition and superior growth performance were achieved by rooted cuttings fertilized exponentially at the rate of 1.0 g cutting−1 yielding (EF2). View Full-Text
Keywords: Chinese fir rooted cuttings; exponential fertilization; chlorophyll fluorescence; nitrogen Chinese fir rooted cuttings; exponential fertilization; chlorophyll fluorescence; nitrogen
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Wu, J.; Lin, H.; Guo, L.; Dong, J.; Zhang, L.; Fu, W. Biomass and Nutrients Variation of Chinese Fir Rooted Cuttings under Conventional and Exponential Fertilization Regimes of Nitrogen. Forests 2019, 10, 615.

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