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滴灌施肥条件下氮磷钾对‘龙脑香樟’幼苗生长及光合特性的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2019年06期
Page:
39-45
Column:
研究论文
publishdate:
2019-11-25

Article Info:/Info

Title:
The growth and photosynthetic characteristics of Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling under different N, P and K level by drip fertilization
Article ID:
1000-2006(2019)06-0039-07
Author(s):
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)
Keywords:
Cinnamomum longepaniculatum ‘Longnao Xiangzhang’ steckling growth fertilizer proportion drip irrigation photosynthesis
Classification number :
S725.7
DOI:
10.3969/j.issn.1000-2006.201807064
Document Code:
-
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.

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Last Update: 2019-11-30