Effects of Different Canopy Density on Growth and Photosynthetic Characteristics of <i>Camellia nitidissima </i>and <i>Camellia Japonica</i> in<i> Illicium verum </i>Forest
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Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (6): 1138-1144.DOI: 10.3969/j.issn.1000-2561.2020.06.010

• Phytophysiology and Biochemistry • Previous Articles     Next Articles

Effects of Different Canopy Density on Growth and Photosynthetic Characteristics of Camellia nitidissima and Camellia Japonica in Illicium verum Forest

LYU Qinyang1,WEI Xiandong1,CHEN Xin1,LU Jingjing2,TAO Zhihua1,WANG Linghui1,*()   

  1. 1. College of Forestry, Guangxi University, Nanning, Guangxi 530004, China
    2. Guangxi State-owned Liuwan Forest Farm, Yulin, Guangxi 537004, China
  • Received:2019-08-22 Revised:2019-10-16 Online:2020-06-25 Published:2020-07-30
  • Contact: WANG Linghui

Abstract:

The influences on the growth and photosynthetic characteristics of Camellia nitidissima and Camellia japonica were studied under full illumination (CK) and Illicium verum forest canopy density at 0.9, 0.7 and 0.5, respectively. The degree of canopy density had a significant effect on the growth index of C. nitidissima and C. japonica, except that it had no significant effect on the leaf width of C. nitidissima. Compared with total illumination, the plant height, ground diameter and biomass of C. nitidissima and C. japonica increased at a canopy density of 0.5, 0.7, and 0.9, and the increase of C. nitidissima was greater than that of C. japonica. The specific leaf weight of both plants decreased first and then increased with the increase of canopy density, and was the highest under full illumination. The leaf length and leaf width of the two plants were the smallest under full illumination, while the leaf thickness was the largest under full illumination. The leaf area and specific leaf area increased first and then decreased with the increase of canopy density. The canopy density was the largest under 0.7 and the smallest under full illumination. The Pn of C. nitidissima was significantly higher than that of other treatments under the canopy density degree of 0.7 and the canopy density of 0.5, and both increased with the increase of effective photosynthetic radiation intensity, and finally stabilized. The canopy density had a significant effect on the quantum efficiency (AQY), maximum net photosynthetic (Pmax), light saturation point (LSP), light compensation point (LCP) and dark respiration rate (Rd) of C. nitidissima and C. japonica. With the increase of canopy density, AQY, Pmax and LSP of C. nitidissima and C. japonica increased first and then decreased. C. nitidissima was the largest in canopy density 0.7, and C. japonica was the largest in canopy density 0.5. LCP of the two plants was the largest under full illumination. Rd of C. nitidissima was the largest under full illumination, and Rd of C. japonica was the largest under the canopy density degree of 0.5. According to comprehensive analysis, C. nitidissima and C. japonica had certain tolerance to darkness and had certain adaptability to low light environment. They were suitable for growth under the environment of canopy density of 0.5-0.7, but intense light was not conducive to the two plants.

Key words: Illicium verum, canopy density, Camellia nitidissima, Camellia Japonica, morphological characteristics, photosynthetic parameters

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