Niche of the Major Tree Species Populations in Cathaya argyrophylla Forest in Guangxi

HE Zhong-wei; HU Ren-chuan; HUANG Ri-bo; XIE Qiang

Using the plots of Cathaya argyrophylla community with different habitats in Guangxi as resource complexes (resource position), and the species of important value as the state index on resource position the niche breadth (Levins index and Shannon Wiener diversity index), the proportion of niche similarity and niche overlap of the dominant species populations in C. argyrophylla community were quantitatively analyzed. The results show that: 1) The C. argyrophylla, Rhododendron simiarum, Pinus kwangtungensis, Dendropanax hainanensis, Pentaphylax euryoides and Dunnia sinensis have greater important value and wider niche breadth, and they are the dominant species resources in the community, with higher ability in the surveyed habitat and occupy an important position in C. argyrophylla forest. But Michelia figo, Gordonia axillaris and Clethra bodinieri var. parviflora are on the contrary. 2)There is a larger niche similarity among most of the species in C. argyrophylla forest, the ecological characteristics of them are similar in resource utilization. The species with wider niche breadth will have a bigger niche similarity value, while the species with smaller niche width have lower similarity value with other species. 3) The niche overlap value is low among the major tree species in C. argyrophylla forest and the competition among main tree species is weak. The species with larger niche breadth have larger niche overlap value and higher probability in occupy or use the same resources with other species, while the species with smaller niche breadth have smaller niche overlap value and lower probability in occupy or use the same resources with other species. 4) C. argyrophylla has a large important value in all the quadrats, so it has great niche breadth value. C. argyrophylla is the dominant species and the constructive species in C. argyrophylla forest community.

1. College of Life Science and Technology, Guangxi University, Nanning 530004, Guangxi, China

2. College of Chemistry and Bioengineering, Hezhou University, Hezhou 542899, Guangxi, China

3. Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, Guangxi, China

4. College of Life Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China

Received Date: 2011-12-10

Available Online: 2012-12-13

Abstract: Using the plots of Cathaya argyrophylla community with different habitats in Guangxi as resource complexes (resource position), and the species of important value as the state index on resource position the niche breadth (Levins index and Shannon Wiener diversity index), the proportion of niche similarity and niche overlap of the dominant species populations in C. argyrophylla community were quantitatively analyzed. The results show that: 1) The C. argyrophylla, Rhododendron simiarum, Pinus kwangtungensis, Dendropanax hainanensis, Pentaphylax euryoides and Dunnia sinensis have greater important value and wider niche breadth, and they are the dominant species resources in the community, with higher ability in the surveyed habitat and occupy an important position in C. argyrophylla forest. But Michelia figo, Gordonia axillaris and Clethra bodinieri var. parviflora are on the contrary. 2)There is a larger niche similarity among most of the species in C. argyrophylla forest, the ecological characteristics of them are similar in resource utilization. The species with wider niche breadth will have a bigger niche similarity value, while the species with smaller niche width have lower similarity value with other species. 3) The niche overlap value is low among the major tree species in C. argyrophylla forest and the competition among main tree species is weak. The species with larger niche breadth have larger niche overlap value and higher probability in occupy or use the same resources with other species, while the species with smaller niche breadth have smaller niche overlap value and lower probability in occupy or use the same resources with other species. 4) C. argyrophylla has a large important value in all the quadrats, so it has great niche breadth value. C. argyrophylla is the dominant species and the constructive species in C. argyrophylla forest community.

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Niche of the Major Tree Species Populations in Cathaya argyrophylla Forest in Guangxi

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