The growth and photosynthetic characteristics of Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling under different N, P and K level by drip fertilization

doi:10.3969/j.issn.1000-2006.201807064

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (6): 39-45.doi: 10.3969/j.issn.1000-2006.201807064

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The growth and photosynthetic characteristics of Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling under different N, P and K level by drip fertilization

ZHANG Yinrong¹(), LAN Zaiping¹^,^*(), BI Honglei², PENG Jingjing¹, MA Xin¹, QIN Xingyu¹

1. World Bank Loan Project Office, Chinese Academy of Forestry,Beijing 100091,China
2. Tianjin TEDA Green Group Co.Ltd., Tianjin 300457, China

Received:2018-07-31 Revised:2019-03-23 Online:2019-11-30 Published:2019-11-30
Contact: LAN Zaiping E-mail:1552465149@qq.com;wboffice@caf.ac.cn

Abstract

Abstract:

【Objective】In order to study the effects of different N, P and K concentrations on 1-year-old Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling and estimate the best N, P and K concentrations and ratios under drip fertilization, we conducted a fertilization experiment with different N, P and K concentrations in the hills of Jingshan, northwestern Yuhang, Zhejiang Province. 【Method】 By measuring growth indices such as tree height, ground diameter and biomass, as well as physiological indices, we compared the effects of drip fertilization and conventional fertilization on the growth of a juvenile ‘Longnao Xiangzhang’ plantation. 【Result】 ① The annual stecklings height, ground diameter, and biomass per tree were significantly higher under drip fertilization, and these parameters all reached their maximum values in the 26.0 g/plant N, 2.6 g/plant R, 16.9 g/plant K, treatment, increasing by 20.36%, 55.15% and 79.44%, respectively, compared with conventional fertilization. ② The trees were consistent in height and ground diameter under drip fertilization and conventional fertilization throughout the year. The height of each treatment tree reached its peak in September, while the ground diameters reached their peaks in June and September, respectively. The maximum differences in annual growth between the drip-fertilized and conventionally fertilized trees occurred in August and September. ③ Physiological indices, such as the net photosynthetic rate, stomatal conductance, and transpiration rate of the 1-year-old ‘Longnao Xiangzhang’ trees were significantly higher under drip fertilization with a similar model of variation; their value increased as the amount of fertilization increased within a certain range and then decreased with excessive fertilization. Compared to conventional fertilization, drip fertilization resulted in a higher light saturation point and apparent quantum efficiency, and a lower light compensation point and dark respiration rate in the leaves of ‘Longnao Xiangzhang’ trees. Hence, the photosynthetic aging of the leaves was extended, which is conducive to the accumulation of photosynthate in the leaves and, subsequently, the growth of ‘Longnao Xiangzhang’. 【Conclusion】As above, the best annual growth of juvenile ‘Longnao Xiangzhang’ plantations can be achieved under drip fertilization with 26.0 per individual of N, 2.6 per individual of P, and 16.9 per individual of K. According to this information, an optimized fertilization scheme for 1-year-old ‘Longnao Xiangzhang’ plantations under drip irrigation can be developed.

Key words: Cinnamomum longepaniculatum ‘Longnao Xiangzhang’, steckling growth, fertilizer proportion, drip irrigation, photosynthesis

CLC Number:

S725.7

ZHANG Yinrong, LAN Zaiping, BI Honglei, PENG Jingjing, MA Xin, QIN Xingyu. The growth and photosynthetic characteristics of Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling under different N, P and K level by drip fertilization[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2019, 43(6): 39-45.

Figures/Tables 9

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Table 5

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施肥类型 type	T1	T2	T3	T4	CK
N	14.0	20.0	26.0	32.0	20.0
P	1.4	2.0	2.6	3.2	2.0
K	9.1	13.0	16.9	20.8	13.0

处理 treatment	苗高/cm seedling height	地径/mm ground diameter
T1	57.31±0.37 b	10.42±0.19 c
T2	58.10±0.56 b	13.30±0.07 b
T3	64.73±1.87 a	15.05±0.42 a
T4	64.54±1.57 a	14.62±0.46 a
CK	53.78±1.44 c	9.70±0.28 d

处理 treatment	全株 individual	叶 leaf	枝 branch	干 stem	根 root
T1	139.10±4.33 c	77.47±1.54 c	30.15±1.48 c	8.78±1.87 bc	22.70±4.81 ab
T2	164.74±3.32 b	92.41±4.38 b	33.97±1.06 b	10.47±1.17 ab	27.90±1.52 a
T3	188.47±6.18 a	106.61±2.64 a	38.72±1.06 a	11.90±1.38 a	31.22±7.38 a
T4	187.52±8.03 a	105.64±5.73 a	39.64±1.73 a	11.77±0.37 a	30.47±3.70 a
CK	105.03±2.94 d	58.93±1.37 d	22.60±3.35 d	6.67±1.43 c	16.82±2.87 b

处理 treatment	P_n/ (μmol·m^-2·s^-1)	G_s/ (μmol·m^-2·s^-1)	C_i/ (μmol·m^-2·s^-1)	T_r/ (μmol·m^-2·s^-1)	E_WUE/ (μmol·mol)
T1	12.79±0.16 d	0.285±0.013 cd	253.34±3.14 c	5.26±0.18 c	2.43±0.08 c
T2	13.43±0.03 c	0.346±0.050 bc	264.24±3.24 b	5.45±0.18 c	2.47±0.09 bc
T3	16.89±0.16 a	0.441±0.080 a	280.73±1.36 a	6.47±0.15 a	2.61±0.04 a
T4	15.33±0.25 b	0.404±0.078 ab	276.33±4.24 a	6.03±0.15 b	2.55±0.07 ab
CK	11.33±0.22 e	0.240±0.040 d	250.27±1.59 c	4.98±0.10 d	2.27±0.05 d

处理 treatment	R_d/ (μmol· m^-2·s^-1)	P_LCP/ (μmol· m^-2·s^-1)	P_LSP/ (μmol· m^-2·s^-1)	P_n,max/ (μmol· m^-2·s^-1)	η_AQY
T1	2.781 9	89	1 291	12.56	0.031 4
T2	2.738 4	84	1 340	13.74	0.032 6
T3	2.465 0	61	1 516	16.96	0.040 3
T4	2.323 7	61	1 494	15.33	0.038 1
CK	3.134 0	102	1 157	11.59	0.030 7

The growth and photosynthetic characteristics of Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling under different N, P and K level by drip fertilization

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