Impact of Simulated Forest Canopy Damage on Understory Biodiversity of Natural Castanopsis fissa Community

LIU Li-qiang; ZHOU Guang-yi; ZHAO Hou-ben; LI Li; QIU Zhi-jun

According to the destruction of forest ecosystem caused by frozen rain and snow disaster in 2008, a simulation experiment of forest mechanical damage was carried out by trimming canopy layer of Castanopsis fissa natural forest at Xiaokeng Basin in northern Guangdong, and the change of understory vegetation was studied. The results are as follows: (1) 1.5 years after pretreatment, the family and species number of shrub, herb and the arbor seedling increased significantly (PP>0.05) in the treatment plot of TR (trimming canopy + removing canopy detritus); the family and species number of arbor seedlings, shrub and herb in the treatment plot of UD (untrimming + canopy detritus adding) decreased slightly. (2) The pioneer species such as Mallotus Lour., Sapium discolor, Litsea cubeba, Callicarpa rubella, Carex filicina, Setaria palmifolia and Ampelopsis cantoniensis became dominant species in the plots of TD and TR, and their coverage of understory vegetation increased significantly. (3) Forest canopy trimming can significantly increase the biodiversity of undergrowth in a short period whereas canopy detritus adding has no measurable impact on it.

1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, Guangdong, China

2. College of Forestry, Central South University of Forestry and Technology, Changsha 410004, Hu'nan, China

Received Date: 2012-10-25

Abstract: According to the destruction of forest ecosystem caused by frozen rain and snow disaster in 2008, a simulation experiment of forest mechanical damage was carried out by trimming canopy layer of Castanopsis fissa natural forest at Xiaokeng Basin in northern Guangdong, and the change of understory vegetation was studied. The results are as follows: (1) 1.5 years after pretreatment, the family and species number of shrub, herb and the arbor seedling increased significantly (PP>0.05) in the treatment plot of TR (trimming canopy + removing canopy detritus); the family and species number of arbor seedlings, shrub and herb in the treatment plot of UD (untrimming + canopy detritus adding) decreased slightly. (2) The pioneer species such as Mallotus Lour., Sapium discolor, Litsea cubeba, Callicarpa rubella, Carex filicina, Setaria palmifolia and Ampelopsis cantoniensis became dominant species in the plots of TD and TR, and their coverage of understory vegetation increased significantly. (3) Forest canopy trimming can significantly increase the biodiversity of undergrowth in a short period whereas canopy detritus adding has no measurable impact on it.

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Reference (21)

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Impact of Simulated Forest Canopy Damage on Understory Biodiversity of Natural Castanopsis fissa Community

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