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Chinese Journal of Applied Ecology ›› 2023, Vol. 34 ›› Issue (8): 2039-2046.doi: 10.13287/j.1001-9332.202308.026

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Effect of gap size on the regeneration in Larix principis-rupprechtii plantation

ZHAO Yi, LI Fuming, ZHU Jingkang, CHANG Chenlong, FENG Yonghan, LIANG Wenjun, WEI Xi*   

  1. College of Forestry, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China
  • Received:2023-05-05 Accepted:2023-06-21 Online:2023-08-15 Published:2024-02-15

Abstract: We conducted a survey on seedlings (height <1 m) and saplings (height ≥1 m, diameter at breast height <5 cm) in 20 gaps of Larix principis-rupprechtii plantations on Guandi Mountains, Shanxi to analyze regene-ration density, growth indicators, and spatial distribution of L. principis-rupprechtii seedlings and saplings under four gap sizes (<60 m2, 60-120 m2, 120-180 m2, and ≥180 m2). The results showed that growth indicators (ground diameter, height) of seedlings and saplings and regeneration density of seedlings were highest in small gaps (14-60 m2). The sapling regeneration density was highest in medium gaps (60-120 m2), and sapling density exceeded seedling density in each size category. L. principis-rupprechtii seedlings and saplings exhibited favorable regeneration in small and medium gaps, while large gaps (120-180 m2) and extra-large gaps (≥180 m2) were unfavorable for L. principis-rupprechtii regeneration. L. principis-rupprechtii seedlings and saplings were mainly distributed within the canopy projection area and along the edge of canopy gap area. Controlling gap size within the range of 14-120 m2 through artificial interventions, such as planting and thinning, could promote the regeneration of L. principis-rupprechtii.

Key words: kernel density estimation, spatial structure, expanded gap, regeneration of Larix principis-rupprechtii.