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Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (3): 152-160.doi: 10.11707/j.1001-7488.20210316

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Effects of Density and Row Spacing on the Quality of Populus tomentosa Seedling

Minghui Sun1,2,Yong Liu1,*,Changwei Wang1,Guolei Li1,Miaomiao Wang1,Xiehai Song1,Xiaochao Chang1,Fangfang Wan1,Huaishan Song3   

  1. 1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083
    2. East China Inventory and Planning Institute, National Forestry and Grassland Administration Hangzhou 310019
    3. Guanxian State-Owned Nursery National Poplar Forest Base Liaocheng 252500
  • Received:2020-01-02 Online:2021-03-25 Published:2021-04-07
  • Contact: Yong Liu

Abstract:

Objective: The quality of seedlings directly affects the outplanting performance, and the density and row spacing configuration of seedlings affect seedling quality and yield. This study aimed to explore Populus tomentosa seedling growth, nutrient content and light interception in response to density and row spacing, and to select the suitable density and row spacing of P. tomentosa seedlings, in order to improve the quality of P. tomentosa seedlings and save the cost. Method: In this paper, three seedling densities (50 000(A1), 41 667(A2), 31 250(A3) seedlings·hm-2) and three kinds of row spacing (uniform row B1 (row spacing 0.8+0.8 m), the narrow-wide rows B2: (row spacing 0.6+1.0 m), and the narrow-wide rows B3: (row spacing 0.4+1.2 m) were designed to explore the effects of seedling density and row spacing on growth, nutrient content, light interception of P. tomentosa. Result: 1) Density and row spacing had significant effects on seedling growth indexes. The seedling height, root biomass and biomass of A2B3 were the highest, with 294.65 cm, 151.92 g and 328.77 g, respectively. 2) Density and row spacing had significant effects on leaf nitrogen concentration of P. tomento sa seedlings. The leaf nitrogen concentration of A3B3 was the highest with a value of 16.43 g·kg-1. Narrow-wide row planting significantly increased the nitrogen concentration in seedling stems and roots compared with equidistant row planting. 3) The interaction of density and row spacing configuration had no significant effect on canopy light interception (P > 0.05). However, row spacing significantly affected light interception and leaf area index (LAI) of P. tomento sa seedlings (P < 0.01). Narrow-wide rows 2 significantly increased light interception and leaf area index of P. tomentosa. The light interception and leaf area index of treatment B3 were the highest, which were 0.87 and 3.59, significantly higher than those of treatment B1. 4) Under different density and row spacing, light interception significantly affected the growth index of the seedlings (P < 0.05). Light interception was significantly positively correlated with seedling height, root collar diameter, aboveground biomass, underground biomass and total biomass of P. tomentosa (P < 0.01), and negatively correlated with stem/root (SR) (P < 0.05). Among them, light interception and biomass had the highest determinant coefficient, with R2 reaching 0.408. Conclusion: Under different density and row spacing, light interception is the key factor affecting seedling height, root collar diameter, stem-to-root ratio and biomass. In general, the seedling growth indexes and nutrient concentration change with different density and row spacing. In terms of seedling quality, under the treatment of A2B3, the growth indexes and light interception of P. tomentosa are the best. As for the production economy, A1B2, A1B3, A2B2, and A2B3 are better.

Key words: Populus tomentosa, growth indexes, nutrient content of seedlings, light interception, leaf area index

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