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

doi:10.3969/j.issn.1000-2561.2020.06.010

Abstract

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 P_n 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 (P_max), light saturation point (LSP), light compensation point (LCP) and dark respiration rate (R_d) of C. nitidissima and C. japonica. With the increase of canopy density, AQY, P_max 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. R_d of C. nitidissima was the largest under full illumination, and R_d 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

CLC Number:

S685.16

LYU Qinyang,WEI Xiandong,CHEN Xin,LU Jingjing,TAO Zhihua,WANG Linghui. Effects of Different Canopy Density on Growth and Photosynthetic Characteristics of Camellia nitidissima and Camellia Japonica in Illicium verum Forest[J]. Chinese Journal of Tropical Crops, 2020, 41(6): 1138-1144.

Figures/Tables 8

References 30

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树种 Species	郁闭度 Canopy density	叶面积 Leaf area/cm²	比叶面积 Specific leaf area/(cm²·g^-1)	比叶重 Specific leaf weight/(g·m^-2)	叶厚 Leaf thickness/μm	叶长 Leaf length/cm	叶宽 Leaf width/cm
金花茶	CK	27.46±1.96^cC	88.13±4.51^cC	113.67±4.81^aA	244.73±7.05^aA	9.27±0.61^cB	2.93±0.06^bB
	0.5	34.20±1.39^bB	98.61±3.23^bB	101.49±2.74^bB	224.13±3.66^bB	9.97±0.83^bcAB	3.40±0.17^aA
	0.7	38.76±1.30^aA	107.30±1.45^aA	93.20±1.03^cB	196.39±7.37^cC	11.13±0.67^abA	3.40±0.20^aA
	0.9	37.01±1.13^aAB	101.21±1.27^bAB	98.81±1.02^bcB	187.30±6.31^cC	11.33±0.25^aA	3.23±0.15^aAB
山茶	CK	19.33±0.98^cB	86.92±3.67^cB	115.19±3.99^aA	324.17±6.46^aA	7.03±0.46^bA	2.70±0.10^aA
	0.5	25.01±0.70^abA	96.79±4.93^abAB	103.50±4.43^abBC	305.97±5.16^bB	8.17±0.74^aA	3.03±0.29^aA
	0.7	26.97±3.00^aA	104.51±2.75^aA	95.73±2.03^cB	286.71±7.78^cC	8.27±0.06^aA	3.20±0.36^aA
	0.9	22.01±1.44^bcAB	95.13±5.98^bcAB	108.86±5.94^abAB	276.79±2.53^cC	7.47±0.40^abA	2.90±0.26^aA

树种 Species	郁闭度 Canopy density	叶面积 Leaf area/cm²	比叶面积 Specific leaf area/(cm²·g^-1)	比叶重 Specific leaf weight/(g·m^-2)	叶厚 Leaf thickness/μm	叶长 Leaf length/cm	叶宽 Leaf width/cm
金花茶	CK	27.46±1.96^cC	88.13±4.51^cC	113.67±4.81^aA	244.73±7.05^aA	9.27±0.61^cB	2.93±0.06^bB
	0.5	34.20±1.39^bB	98.61±3.23^bB	101.49±2.74^bB	224.13±3.66^bB	9.97±0.83^bcAB	3.40±0.17^aA
	0.7	38.76±1.30^aA	107.30±1.45^aA	93.20±1.03^cB	196.39±7.37^cC	11.13±0.67^abA	3.40±0.20^aA
	0.9	37.01±1.13^aAB	101.21±1.27^bAB	98.81±1.02^bcB	187.30±6.31^cC	11.33±0.25^aA	3.23±0.15^aAB
山茶	CK	19.33±0.98^cB	86.92±3.67^cB	115.19±3.99^aA	324.17±6.46^aA	7.03±0.46^bA	2.70±0.10^aA
	0.5	25.01±0.70^abA	96.79±4.93^abAB	103.50±4.43^abBC	305.97±5.16^bB	8.17±0.74^aA	3.03±0.29^aA
	0.7	26.97±3.00^aA	104.51±2.75^aA	95.73±2.03^cB	286.71±7.78^cC	8.27±0.06^aA	3.20±0.36^aA
	0.9	22.01±1.44^bcAB	95.13±5.98^bcAB	108.86±5.94^abAB	276.79±2.53^cC	7.47±0.40^abA	2.90±0.26^aA

树种 Species	郁闭度 Canopy	表观量子效率AQY Apparentquantum efficiency AQY/(μmol·m^-2·s^-1)	最大净光合速率P_max Maximumnet photosynthetic P_max/(μmol·m^-2·s^-1)	光饱和点LSP Light saturation point/(μmol·m^-2·s^-1)	光补偿点LCP Light compensation point/(μmol·m^-2·s^-1)	暗呼吸速率R_d Dark breathing rate R_d/(μmol·m^-2·s^-1)
山茶	CK	0.034±0.004^cC	2.32±0.23^dD	951.11±29.57^bB	50.83±2.73^aA	1.04±0.10^bAB
	0.5	0.072±0.008^aA	5.40±0.17^aA	1068.46±51.22^aA	24.71±4.01^cC	1.32±0.20^aA
	0.7	0.058±0.002^bB	3.94±0.17^bB	724.13±18.55^cC	16.27±0.26^dD	0.82±0.03^cB
	0.9	0.023±0.003^dC	3.26±0.27^cC	783.41±26.42^cC	42.55±2.05^bB	0.72±0.03^cB
金花茶	CK	0.049±0.009^bB	2.18±0.15^dC	380.30±14.06^cC	22.70±1.32^aA	1.39±0.16^aA
	0.5	0.052±0.007^bAB	2.87±0.15^cB	410.32±14.66^cC	10.39±0.74b^cB	0.81±0.06^bB
	0.7	0.074±0.009^aA	4.23±0.30^aA	567.45±30.68^aA	13.13±2.20^bB	0.39±0.11^cC
	0.9	0.062±0.005^abAB	3.43±0.26^bB	471.08±19.01^bB	8.51±2.07^cB	0.49±0.14^cBC

树种 Species	郁闭度 Canopy	表观量子效率AQY Apparentquantum efficiency AQY/(μmol·m^-2·s^-1)	最大净光合速率P_max Maximumnet photosynthetic P_max/(μmol·m^-2·s^-1)	光饱和点LSP Light saturation point/(μmol·m^-2·s^-1)	光补偿点LCP Light compensation point/(μmol·m^-2·s^-1)	暗呼吸速率R_d Dark breathing rate R_d/(μmol·m^-2·s^-1)
山茶	CK	0.034±0.004^cC	2.32±0.23^dD	951.11±29.57^bB	50.83±2.73^aA	1.04±0.10^bAB
	0.5	0.072±0.008^aA	5.40±0.17^aA	1068.46±51.22^aA	24.71±4.01^cC	1.32±0.20^aA
	0.7	0.058±0.002^bB	3.94±0.17^bB	724.13±18.55^cC	16.27±0.26^dD	0.82±0.03^cB
	0.9	0.023±0.003^dC	3.26±0.27^cC	783.41±26.42^cC	42.55±2.05^bB	0.72±0.03^cB
金花茶	CK	0.049±0.009^bB	2.18±0.15^dC	380.30±14.06^cC	22.70±1.32^aA	1.39±0.16^aA
	0.5	0.052±0.007^bAB	2.87±0.15^cB	410.32±14.66^cC	10.39±0.74b^cB	0.81±0.06^bB
	0.7	0.074±0.009^aA	4.23±0.30^aA	567.45±30.68^aA	13.13±2.20^bB	0.39±0.11^cC
	0.9	0.062±0.005^abAB	3.43±0.26^bB	471.08±19.01^bB	8.51±2.07^cB	0.49±0.14^cBC