Effects of N/P ratio and loading on growth and construction of nutrients reserves of one-year-old seedlings for five kinds of precious tree species

LI Fengqing, WANG Xiuhua, CHU Xiuli, ZHANG Dongbei, WU Xiaolin, ZHOU Shengcai, YE Ming

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (1) : 72-80.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (1) : 72-80. DOI: 10.3969/j.issn.1000-2006.201902007

Effects of N/P ratio and loading on growth and construction of nutrients reserves of one-year-old seedlings for five kinds of precious tree species

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Abstract

【Objective】 To provide scientific guidance for seedling cultivation in containers, the impacts of slow-release fertilizer (SRF) loading were observed for the growth, nitrogen (N) and phosphorus (P) uptake, and nutrient pool construction of five precious tree species, such as Phoebe chekiangensis. 【Method】 A 4 × 4 factorial experimental design was used to compare the impacts of the N/P mass ratio (1.75:1, 2.25:1, 2.75:1 and 3.25:1) and SRF loading levels (1.5, 2.5, 3.5 and 4.5 kg/m 3) on the growth and N and P nutrient pool construction of one-year-old seedlings.【Result】 Significant effects were detected in the growth and dry matter accumulation between N/P ratios, SRF loading, and their interaction. As the N/P ratio increased, the tree species responded differently. The largest growth and dry matter accumulation of the five precious tree species was detected with 3.5 kg/m3 SRF loading. The N concentration in the leaves of P. chekiangensis, Cinnamomum chekiangense and Schima superba was correlated with the N/P ratio, but there was no difference in the leaf N concentration of Taxus wallichiana and Cyclobalan gilvain. The P concentration in the leaves of all species, except for P. chekiangensis, also significantly differed with varying N/P ratios. However, the N and P accumulation in the leaves of all species were not sensitive to the N/P ratio. The effect of the SRF loading on the nutrient accumulations was more obvious than the N/P ratios; the concentration and accumulation of leaf N and P were highest with 3.5 kg/m3 SRF loading. Changes in the N and P concentrations in the organs of the different species were similar, indicating N/P absorption synchrony, whilst the distribution of N and P among the organs was species-specific. 【Conclusion】 Based on the growth characteristics of the different tree species, seedlings of P. chekiangensis should be loaded with higher N content fertilizer, and the seedlings of Cinnamomum chekiangense, Cyclobalan gilva and S. superba should be loaded with higher P content fertilizer. T. wallichiana seedlings are not sensitive to the N/P ratio, but nutrition construction suggests that it is N/P ratio and adding appropriate amounts of SRF (3.5 kg/m3).

Key words

Phoebe chekiangensis / Cinnamomum chekiangense / Taxus wallichiana var. mairei / Cyclobalanopsis gilva / Schima superba / container seedling / N/P ratio / slow-release fertilizer loading / nutrient pool

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LI Fengqing , WANG Xiuhua , CHU Xiuli , et al . Effects of N/P ratio and loading on growth and construction of nutrients reserves of one-year-old seedlings for five kinds of precious tree species[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2020, 44(1): 72-80 https://doi.org/10.3969/j.issn.1000-2006.201902007

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