JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 101-108.doi: 10.12302/j.issn.1000-2006.202110015

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The spatial distribution characteristics of light intensity attenuation under natural secondary forests in eastern Jilin Province, China

WANG Qisong(), GUO Qingxi()   

  1. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
  • Received:2021-10-09 Accepted:2022-03-29 Online:2023-01-30 Published:2023-02-01
  • Contact: GUO Qingxi E-mail:jason1911@126.com;gqx@nefu.edu.cn

Abstract:

【Objective】 The study explored the characteristics of light intensity attenuation among different forest types, spatial scales, and orientations of natural secondary forests in eastern Jilin Province, China. 【Method】 The tree growth and light intensity attenuation were investigated in five plots of 0.6 hm2 each by dividing them according to forest types, spatial scales, and orientations, and the moving window method was then used to analyze the effect of forest community structure on understory light. 【Result】 In the natural secondary forests of eastern Jilin, the arbor basal area was significantly correlated with the understory light intensity attenuation rate (P<0.01). With increasing spatial scale, the correlation coefficient between the arbor basal area and light intensity attenuation rate also increased gradually. When the inner window of most forest types reached 10 m × 10 m, the light intensity attenuation rate was positively significantly related to the arbor basal area (P<0.01). The maximum correlation coefficient was at a scale of 25 m × 25 m. The presence of trees within 10 m of the inner window was also positively significantly related to the light intensity attenuation rate under the inner window (P<0.01). The trees on the east and south sides had a greater impact on the light intensity attenuation rate under the inner window than those on the west and north sides. 【Conclusion】 The moving window method can be used to analyze the range of influence exerted by different forest types on the light intensity attenuation. Light-loving tree species demonstrated a highly significant correlation between the arbor basal area and the light intensity attenuation rate at a greater range of scales than shade-tolerant species. In the scale range of (10 m×10 m)-(40 m×40 m), the arbor basal area of most forest-type trees was significantly positively correlated with the light intensity attenuation rate (P<0.01). Differences in the orientation of trees also affect the attenuation of light intensity.

Key words: natural secondary forest, light environment, light intensity attenuation, spatial heterogeneity, moving window method, north slope of Changbai Mountains

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