Effects of different nitrogen supply on biomass, N and P concentration and their seasonal variation of  Larix olgensis seedlings

doi:10.3969/j.issn.1000-2006.2014.05.016

Effects of different nitrogen supply on biomass, N and P concentration and their seasonal variation of Larix olgensis seedlings

LI Haixia, XU Chuanling, GUO Shuping,GUO Chengbo,BAI Hui

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (05) : 79-84.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (05) : 79-84. DOI: 10.3969/j.issn.1000-2006.2014.05.016

Effects of different nitrogen supply on biomass, N and P concentration and their seasonal variation of Larix olgensis seedlings

LI Haixia¹, XU Chuanling², GUO Shuping^1*,GUO Chengbo¹,BAI Hui^1*

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Abstract

The effects of different concentration of nitrogen treatments on the biomass, nitrogen and phosphorus partition in roots, stems and leaves of one-year-old Larix olgensis seedlings were studied by a sand culture experiment in greenhouse. The results suggested that N supply could significantly increase the seedling biomass. The biomass of roots, stems and leaves were the highest when 8 mmol/L nitrogen was applied in July, August and September. The biomass of leaves decreased gradually, while that of roots increased from July to September. The N concentrations increased significantly along with the N supply levels increasing. The mean N concentrations in roots, stems and leaves in the latter growth stage were 1.46, 1.48 and 1.17 times respectively more than that in the initial stage. The P concentrations fluctuated with the N levels change. The N stocks of whole plant increased markedly as the growth of plant, and it was 2.86 times more in September than in July. The N allocation also varied in leaf, stem, and root. The proportion of N allocation in leaf was the highest in July(60% in average). The proportion of N allocation in root increased with plant growth, which was the highest in September(41% in average). There was no obvious difference in N stocks among different N levels. The P stocks of the roots, stems and leaves were basically consistent with the N, but the variation scope was smaller than that of N.

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LI Haixia, XU Chuanling, GUO Shuping,GUO Chengbo,BAI Hui. Effects of different nitrogen supply on biomass, N and P concentration and their seasonal variation of Larix olgensis seedlings[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2014, 38(05): 79-84 https://doi.org/10.3969/j.issn.1000-2006.2014.05.016

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