Effect of Forest-fire Rehabilitation Time on Plant Diversity in Daxing'an Mountains, Northeastern China

doi:10.7525/j.issn.1673-5102.2019.04.005

Abstract

Abstract: Forest fire is an important factor controlling forest ecosystem successions in the Daxing'an Mountains, Northeastern China, while long-term temporal dynamics in plant diversity and species abundance are still very limited to date, for modeling forest ecological services variations. We chose 48 pairs plots in different fire-rehabilitation years(1-5, 5-10, 10-20, 20-30, 30-40, and 40-50 years) in Daxing'an Mountains(fired site and neighbor unburned site as control), and diversity indices(Shannon-wiener index, Simpson index and species richness) and species abundance in tree, shrub and herb layers were calculated based on the field-surveyed data. Firstly,both fire-control differences in different parameters showed that tree diversity and richness declined at begin(lowest at 10-year rehabilitation), then increased afterward to the control-level after 30-40 fire-rehabilitation years. The shrub diversity index was similar to the change trend of trees, while most of the trends were statistically significant(P<0.05). The shrub Shannon index and richness indexlinearly increased with rehabilitationyears, andreached the control level after 30-year rehabilitation. The Simpson index of the herb decreased linearly with increasing fire age, but there was no linear change in uniformity and richness. Secondly, In terms of relative abundance of dominant species:In the arbor layer, Betula platyphylla in the fire siteduring 5-30 years rehabilitationtook >30% in proportion, and thereafter, the proportion was<15%; Larix gmelinii took over 50% in abundance in the 30-40 years rehabilitation stage. In the shrub layer, the largest proportion was Vaccinium vitis-idaea in less than 30-year rehabilitation stages, and the Corylus heterophylla be come the largest proportion. In the herbaceous layer,Deyeuxia angustifolia took the largest proportion in less than 30-year rehabilitation stages. In all, tree species recovered in a lower rate, and shrub and herb species recovered in a much faster rate. Plant diversity and dominant species alternation are basis for studying the forest ecological services(such as carbon sinks), and our data support future scientific management of the boreal forests in China, especially in the implementation of the Natural Forest Protection Program(a national policy of China).

Key words: Simpson diversity index, Shannon-wiener index, larch natural forests, dominant species abundance, temporal dynamics

CLC Number:

S762.1

YANG Yang, ZHANG Xi-Ting, XIAO Lu, YANG Yan-Bo, WANG Ke, DU Hong-Ju, ZHANG Jian-Yu, WANG Wen-Jie. Effect of Forest-fire Rehabilitation Time on Plant Diversity in Daxing'an Mountains, Northeastern China[J]. Bulletin of Botanical Research, 2019, 39(4): 514-520.

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