JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1): 145-155.doi: 10.12302/j.issn.1000-2006.202007003

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Effect of fungus-residue and other matrix formulations on growth and chlorophyll fluorescence parameters of shelled walnut seedlings

JI Yanhong1(), PAN Pingping1, DOU Quanqin2,*(), XIE Yinfeng1,*()   

  1. 1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing 210037, China
    2. Jiangsu Aacademy of Forestry, Nanjing 210014, China
  • Received:2020-07-02 Accepted:2020-07-31 Online:2022-01-30 Published:2022-02-09
  • Contact: DOU Quanqin,XIE Yinfeng E-mail:1678716640@qq.com;douqq2008@163.com;xxyy@njfu.edu.cn

Abstract:

【Objective】 This study aims to investigate the effect of substrate formula like bacterial residue on seedling growth and fluorescence characteristics of Carya illinoinensis seedings and select a low-cost substrate formula suitable for seedling growth.【Method】 One-year-old container seedlings of Carya illinoinensis ‘Shaoxing’ progeny were used as material. The garden soil, peat, vinegar bad volume ratios were respectively set to 4:3:3 (A1), 4:2:4 (A2), 4:1:5 (A3) and garden soil, peat, mushroom residue volume ratios were respectively set to 4:3:3 (B1), 4:2:4 (B2), 4:1:5 (B3) formula, garden soil was the control (CK), seven treatments were used. The seedling height, ground diameter and chlorophyll fluorescence parameters of these treatments were determined to analyze the effects of different matrix formula on the growth and fluorescence properties of C. illinoinensis container seedling.【Result】 The seedling growth indexes of the different treatments significantly differed. Unlike garden soil, adding mushroom residue and vinegar bad could decrease the bulk density, increase the ventilation of the matrix porosity and organic matter and so on. Adding mushroom residue substrate was conducive to the growth of C. illinoinensis seedlings. Besides, The order of treatments from small to large according to seedling height was CK < A3 < A1 < A2 < B1 < B3 < B2; the order according to ground diameter was CK < A1 < A2 < A3 < B1 < B2 < B3. The addition of B2 and B3 bacterial residues into the substrate was the most suitable for the growth of seedlings. Seedling height and ground diameter of seedings that treated by B3 garden soil, peat, mushroom residue volume 4:1:5 matrix were significantly higher than that of control, increased by 65% and 73% respectively. Also, In terms of chlorophyll fluorescence parameters, the Fv/Fm ratio of B substrate treatment was higher than that of A substrate treatment in June and July, and there was no significant difference between A substrate and B substrate treatment in August and September. The Fv/F0 of seedlings treated with B substrate was higher than that of seedlings treated with A substrate in June to August, and the Fv/F0 of seedlings treated with A substrate was higher than that of seedlings treated with B substrate in September. The Fv '/Fm' index of all seedlings treated with B substrate was higher than that of seedlings treated with A substrate except in July. ΦPSⅡ of seedling treated with substrate B in June to July was higher than that of treated substrate. The photochemical quenching (qP) of seedling treated with the substrate B in June to July was higher than that treated with the substrate. Non-photocheroical quenching (NPQ) A of seedlings treated with A substrate were consistently higher than those treated with B substrate from June to September. During June to September, the chlorophyll fluorescence parameters of B3 treated seeding were significantly higher than control. According to the correlation analysis, the seedling height, and the maximum water holding capacity and organic matter content were significantly positively correlated.There was a significant positive correlation between ground diameter and maximum water holding capacity.There is a high correlation between available phosphorus and available potassium, which was related to the pH value in the formula matrix. The suitable pH value was conducived to the conversion of phosphate and exchangeable potassium ions. When the pH value was between 6.0 and 6.5, the availability of phosphorus and potassium in the matrix was the highest. Seedling height, ground diameter and F0, Fm, Fv'/ Fm, ΦPSⅡ and qP was significantly positively related, seedling height and NPQ was significantly negative correlation, and ground diameter were very significant negative correlation with NPQ.【Conclusion】 In order to reduce the amount of peat, the mixture matrix of garden soil, peat and bacterial residue with a volume ratio of 4:1:5 was suitable for improving the growth and the light energy utilization efficiency of C.inillinoinensis seeding, moreover, its cost of seedling cultivation decrease, which was conducive to production and application.

Key words: Carya illinoinensis, container, seedling matrix, growth, chlorophyll fluorescence

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