Chin J Plant Ecol ›› 2021, Vol. 45 ›› Issue (1): 38-50.DOI: 10.17521/cjpe.2020.0176

• Research Articles • Previous Articles     Next Articles

Effects of canopy structure on productivity in a typical mixed broadleaved-Korean pine forest

Hanula TASIKEN1, CAI Hui-Ying2,3, JIN Guang-Ze1,3,*()   

  1. 1Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
    2School of Forestry, Northeast Forestry University, Harbin 150040, China
    3Key Laboratory of Sustainable Forest Ecosystem Management Ministry of Education, Northeast Forestry University, Harbin 150040, China
  • Received:2020-05-29 Accepted:2020-08-28 Online:2021-01-20 Published:2020-12-09
  • Contact: JIN Guang-Ze
  • Supported by:
    National Natural Science Foundation of China(31901299)


Aims The mixed broadleaved-Korean pine (Pinus koraiensis) forest is a zonal vegetation type in Northeast China. Clarifying the influencing factors of productivity is of great significance for understanding the maintenance mechanism of productivity in temperate forests.
Methods The study was conducted based on survey data of a 9 hm2 permanent plot in a typical mixed broadleaved- Korean pine forest in the Xiaoxing’an Mountains. Census data of 2005 and 2015 for all individuals with diameter at breast height >6.5 cm within each 30 m × 30 m sub-plot were used to calculate canopy structural complexity, species diversity and stand basal area. We analyzed the direct and indirect factors affecting forest productivity using structural equation model and data on topography and soil physicochemical properties in each sub-plot.
Important findings Both the canopy structural complexity and the species diversity were positively related to productivity, with canopy structural complexity having a significantly greater effect than species diversity. The effects of canopy structural complexity on productivity consisted of two attributes: the vertical stratification and the plasticity. The vertical stratification played a significant role in driving the changes in forest productivity, while plasticity had no significant effect. The stand basal area was positively related to productivity, but with less effect than the canopy structural complexity. Both the canopy structural complexity and the species diversity had indirect effects on productivity via stand basal area. However, the environmental factor representative of slope and soil total phosphorus played differential roles on productivity for varying canopy structral complexity, and it was significantly and negatively correlated with productivity after removing the effects of canopy vertical stratification. In short, in a typical mixed broadleaved-Korean pine forest, the canopy structural complexity is more crucial for explaining the diversity-productivity relationship than species diversity, and the roles of other biotic and abiotic factors in productivity should not be ignored.

Key words: biodiversity, canopy structural complexity, species evenness, productivity, mixed broadleaved- Korean pine forest