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Effects of exponential fertilization on the growth and photosynthetic characteristics of superior clone of Cunninghamia lanceolata*
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Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2020 02
Page:
1-13
Research Field:
Articles
Publishing date:

Info

Title:
Effects of exponential fertilization on the growth and photosynthetic characteristics of superior clone of Cunninghamia lanceolata*
Author(s):
LI Mao 12 REN Zhengbiao 12 ZHENG Mingming 12 HONG Kai12XU Shanshan 12 YE Yiquan 12 LIN Kaimin 12*
1 Forestry College,Fujian Agriculture and Forestry University, Fuzhou, 350002, China
2 State Forestry and Grassland Administration Engineering Research Center of Chinese Fir, Fuzhou, 35002, China)
Keywords:
exponential fertilization photosynthetic characteristics Cunninghamia lanceolata superior clone
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.05045
DocumentCode:

Abstract:
An exponential fertilization (EF) experiment with five nitrogen dose levels (0, 40, 80, 120, and 160 mg/plant) and combined with conventional fertilization (CF) with 40 mg/plant nitrogen level were conducted in the study by using the cutting seedlings of superior clone of Cunninghamia lanceolata to investigate the responses of growth and photosynthetic characteristics of C. lanceolata seedlings under various fertilization treatments, and to select the most suitable fertilization manner and nitrogen level for the growth of superior clone of C. lanceolata, providing reference for nitrogen management of C. lanceolata seedlings. The results showed that (1) The height and ground diameter of C. lanceolata seedlings were increased obviously under various fertilization treatments as compared with control. Under the same nitrogen level, although the seedlings height and ground diameter of C. lanceolata in EF1 treatment was higher than that in CF treatment, no significant differences was observed between these two treatments. (2) The maximal fluorescence (Fm’), variable fluorescence (Fv), PSⅡ maximal photochemical efficiency (Fv/Fm), PSⅡpotential efficiency (Fo/Fv) and actual maximum quantum yield (QY) were significantly higher in EF treatment than that in control and CF treatments, and these indexes were all reached its maximum at 120 mg/plant nitrogen level except for Fv/Fm which was slightly lower in EF3 than that in EF4. An obviously lower of initial fluorescence (Fo) and non-photochemical quenching coefficient (NPQ) were observed in EF treatments as compared with control. (3) The net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci), the contents of chloroplast pigments and carotenoid in leaves of C.lanceolata were significantly increased under various fertilization treatments, and the Pn, Gs, Tr, Ci, chloroplast pigments content and carotenoid content in exponential fertilization treatment (EF1) was significantly higher than that in CF with the same nitrogen fertilization level, and these indexes were all showed the trend of first increase and then decrease along with increasing nitrogen levels from 0 to 160 mg/plant, and arrived their maximum at 120 mg/plant nitrogen level except for chloroplast pigments content. Therefore, exponential fertilization with 120 mg/plant nitrogen level can significantly enhanced leaves photosynthesis rate by increasing PSⅡ?photochemistry?activity and electron transfer rate, while decreasing thermal dissipation of light energy, which in turn promoted the growth of C. lanceolata seedlings, thus 120 mg/plant nitrogen level would be the suitable one for the growth of superior clone of C. lanceolata seedlings.

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Last Update: 2019-07-30