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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (1): 90-98.doi: 10.11707/j.1001-7488.LYKX20210386

• Research papers • Previous Articles     Next Articles

Effects of Photoperiod Manipulations and Watering Regimes on Seedling Quality and Field Performance of Summer-Planted Larix principis-rupprechtii

Na Luo1,2,Ruijie Qu3,Guolei Li1,2,*,Lu Meng4,Leng Han1,2,Guifeng Guo5,Fengyuan Ma5,Jiaxi Wang1,2   

  1. 1. Deciduous Oak Research Center, Beijing Forestry University Beijing 100083
    2. Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University Beijing 100083
    3. School of Economics & Management, Beijing Forestry University Beijing 100083
    4. Henan Province Forestry Ecological Construction and Development Center Zhengzhou 450000
    5. Miyun District Landscaping Bureau of Beijing Municipality Beijing 101500
  • Received:2021-05-21 Online:2023-01-25 Published:2023-02-24
  • Contact: Guolei Li

Abstract:

Objective: The objective of this study was to assess the effect of watering regimes and photoperiod manipulations of acclimation treatments on seedling morphology and physiology attributes in the nursery and field performance of Larix principis-rupprechtii. Method: We applied three watering regimes at 40%, 60%, 80%(control) of container capacity (CC) combined with two photoperiod manipulations at natural daylength (ND) and 10-hour (10 h) daylength (SD) in the nursery for three weeks during summer and then outplanted in late-July (July 23rd).We measured seedling morphological and physiological attributes in the nursery.Additionally, we measured field survival for two years. Result: Compared to ND, SD significantly induced seedling bud set (66% vs.26%).Reduced photoperiod slightly increased root starch concentration (P=0.068).Watering regime to CC 40% significantly decreased shoot to root ratio (S/R)(P < 0.001) and accelerated shoot starch converted into soluble sugars.Compared to ND, SD significantly improved field survival at the end of the first growing season (92% vs.82%).This suggested that photoperiod manipulation at 10 h daylength increased root starch concentration and bud set, which strengthened seedling hardness.SD combined with CC 40% and CC 60% treatments improved field survival (above 60%) at the end of the second growing season. Conclusion: Photoperiod manipulation at 10 h daylength combined with watering regimes at 40%-60% increased field survival of Larix principis-rupprechtii seedlings at the end of the first and second growing season.The study reveals the vital role of seedling carbon storage and S/R in seedling quality for summer-planted seedlings.

Key words: photoperiod manipulations, watering regime, Larix principis-rupprechtii, summer planting, carbon partitioning, starch

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