Effects of Simulated Nitrogen Deposition on the Growth and the Content of Non-structure Carbohydrate of Sinocalycanthus chinensis Seedlings

doi:10.7525/j.issn.1673-5102.2020.01.007

Abstract

Abstract: With the seedlings of Sinocalycanthus chinensis, four simulated nitrogen deposition levels, including control(CK, 0 g·m^-2·a^-1), lower nitrogen(N1, 2 g·m^-2·a^-1), medium nitrogen(N2, 8 g·m^-2·a^-1), and high nitrogen(N3, 32 g·m^-2·a^-1). After 1 year, the growth, biomass allocation and the content of the non-structure carbohydrate of S.chinensis seedlings among the different treatments were measured. The results showed that:the plant height and base diameter of the seedling showed a trend of increasing first and then decreasing, with medium nitrogen treatment being the highest. The leaf and shoot biomass of the seedlings showed a trend of gradual increase, while the stem, root, total biomass of the seedlings, and root biomass ratio and root shoot ratio showed a trend of increasing first and then decreasing. The leaf biomass ratio showed a trend of decreasing first and then increasing with the increase of nitrogen concentration. The mean perimeter of the maximum leaf, the mean length and area of the leaf was the highest in the treatment of N2. The width/length ratio of the maximum leaf was the highest in the treatment of N3. The specific leaf area in the treatments of N2 and N3 were significantly lower than that in treatment CK. The contents of starch and non-structural carbohydrates in the leaves were highest in the treatment of N2, while those in the stem were the lowest in the treatment of N3. In conclusion, nitrogen deposition showed negative effects on the growth and physiological traits of S.chinensis seedlings and the most significant effect were found in the treatment of N2.

Key words: nitrogen deposition, Sinocalycanthus chinensis, morphological indicators, biomass, Non-structure carbohydrate

CLC Number:

Q948

ZHAO Zhe, JIN Ze-Xin. Effects of Simulated Nitrogen Deposition on the Growth and the Content of Non-structure Carbohydrate of Sinocalycanthus chinensis Seedlings[J]. Bulletin of Botanical Research, 2020, 40(1): 41-49.

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