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Growth and survival of hybrid larch F1 (Larix gmelinii var. japonica × L. kaempferi) and Japanese larch under various intensities of competition

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Abstract

Competition between planted seedlings and vegetation is a critical constraint affecting the survival and growth of seedlings at the initial stages of forestation. Quantitatively assessing the impact of competitive vegetation on the growth of planted seedling is vital for reduction of weeding cost. This study compared the survival and growth of potentially fast-growing hybrid larch F1 seedling (Larix gmelinii var. japonica × L. kaempferi) with Japanese larch (L. kaempferi) at three competitive levels, which were 0–50%, 50–75% and 75–100% of the seedling surface covered by vegetation after planting. When more than three-quarters of the seedling surface was covered by vegetation, the survival rate of Japanese larch dropped substantially. In contrast, hybrid larch F1 sustained a high survival of 95% despite the high covering. Annual height growth significantly decreased with increasing coverage for both species. In addition, the height growth of hybrid larch F1 was significantly higher than that of Japanese larch, whereas the difference became insignificant when more than three-quarters of the surface was covered. If the requirement for weeding is whether three-quarters of the seedling surface is covered or not with vegetation, it was determined that hybrid larch F1 did not require weeding if the seedling height attained about 170 cm in the previous fall; whereas Japanese larch needed about 200 cm. The findings imply that weeding is needed to unlock the hybrid larch F1’s high growth potential, and that weeding can be accomplished more than a year earlier than with Japanese larch.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Dr. S. Sasaki, Dr. K. Ozaki, Mr. T. Yamada, Mr. T. Nagasawa, and Ms. H. Yamamoto in Forestry and Forest Products Research Institute for their help in establishing the study site and conducting the field investigation. We also thank Dr. E. Agathokleous for editing of the manuscript.

Funding

This study was supported by the project “Research on development of silviculture system utilizing high performance seedlings and cuttings” funded by Ministry of Agriculture, Forestry and Fisheries of Japan (18064868).

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Conceptualization: HH, IT, AU, SK, and HU; Methodology: HH, IT, and SK; Formal analysis and investigation: HH, IT, AU, MK, QH, and SK; Writing—original draft preparation: HH; Writing—review and editing: HH, MK, and QH; Funding acquisition: HU. All authors contributed to the article and approved the submitted version.

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Correspondence to Hisanori Harayama.

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Harayama, H., Tsuyama, I., Uemura, A. et al. Growth and survival of hybrid larch F1 (Larix gmelinii var. japonica × L. kaempferi) and Japanese larch under various intensities of competition. New Forests 54, 945–961 (2023). https://doi.org/10.1007/s11056-022-09952-8

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  • DOI: https://doi.org/10.1007/s11056-022-09952-8

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