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Edge Effects on Liana Communities in a Natural Secondary Forest in Bawangling, Hainan Island

Author: WuYuNa
Tutor: TaoJianPing
School: Southwestern University
Course: Ecology
Keywords: Secondary forest Lianas Edge effects Diversity Vertical distribution
CLC: Q948
Type: Master's thesis
Year: 2010
Downloads: 48
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Abstract

Select Hainan Island, Island, South China natural recovery edge of the secondary forest formed over 17 years and 13 years, respectively, set four 10m x 100 m of the transect survey transects lianas and trees, lianas, under the edge effect is diverse changes in the composition, size structure and climbing, fundamental changes in the relationship between lianas and trees and lianas vertical distribution characteristics. Edge effect lianas change the study results: two kinds of edge, woody vines of the multi-degree with from the increase in the distance from the edge significantly reduced, woody vines of the chest high off the area did not produce a significant change, woody vines of the rich degree only with the edge in 17 years increase the distance decreases; edge in 13 years, with the increase from the edge distance, diameter at breast height greater than 1cm woody vine increase in the proportion of the individual, and the vine of the 17 years edge diameter class structure is relatively stable; different distance from the edge, different proportion of individuals of the woody vine climbing way there are significant differences in the two kinds of edge main stem twining vine of the both dominated. Edge effect on the community structure of the woody vine with the increase of the distance away from the edge of the weakened to influence depth with the edge of the increase of years and increase the impact in the 17 years of the edge distance of 40 to 50m in 13 years edge about 10m. Edge effect of trees change research results: two kinds of edge trees total chest high off the area, the average chest basal area, average height, average branch under the high, the number of individual seedlings are not with the change from the distance from the edge occurrence of change, but rich in trees degree with the increase of the distance away from the edge of the lower edge 17 years affect the depth of about 20 to 30m, 13 edge 10 to 20m. Edge 13 trees in abundance with increasing distance from the decreased. Tree size structure changes with distance did not show certain trends. Edge of the formation of life only have a certain influence on trees and seedling number of individuals, 17 years in the edge of trees and seedlings is generally higher than the number of individuals 13 years of edge. Overall edge effect has little effect on the secondary forest tree community. Lianas and trees in the edge effect relation results: two kinds of edge, DBH 1-5cm, 5-10cm of tree climbing rate over distance has changed, 17 years in the edge of DBH gt; edge of 20 cm and 13 years DBH 10 to 20 cm of the climbing rate did not change with distance. Trees cling to the frequency with and reduce the distance the distance from the edge increases, cling three strains of the vine of the trees least, trends than the obvious edge in 17 years; cling to a vine of the trees up to, obvious change in 13 years edge. Wood Fujimoto edge 17 with distance increases. Edge of the formation of life for each wood Fujimoto number, the greater the degree of decline in the 17 years in the edge, but the overall edge above 13 years. Edge effects lianas vertical distribution of results: 17 years of edge, the number of individuals of different height levels in the woody vine with the increase of distance from the edge of the lower. Two kinds of edge, different height levels in the lianas total basal area changed with increasing distance. Canopy lianas individuals, although the proportion is low, but it occupies the main part of the transect the lianas total basal area. Lianas climbing in the forest floor only occur with the distance from the edge distance changes, the main stem is wound in each height class are the main climbing. In short, the relationship between the edge effect lianas diversity, vertical distribution and trees (climbing rate, cling to the frequency of each wood Fujimoto) with different distance from the edge of the changes in the early formation at the edge edge of the formation of life, different lianas edge response, affect the depth of about 40 to 50m in the 17 years the edge 13 edge about 10m.

Edge Effects on Liana Communities in a Natural Secondary Forest in Bawangling, Hainan Island

Abstract

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