JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (2): 223-234.doi: 10.11849/zrzyxb.20160305

• Resource Ecology • Previous Articles     Next Articles

Niches of Main Dominant Species of Different CommunityTypes in Mulinzi Nature Reserve

LIN Yong, AI Xun-ru, YAO Lan, HUANG Wei, CHEN Si   

  1. School of Forestry and Horticulture, Hubei Institute for Nationalities, Enshi 445000, China
  • Received:2016-03-23 Online:2017-02-15 Published:2017-02-15
  • Supported by:
    The Education Department of Hubei Province Key Project, No. D20122901. ]

Abstract: The paper quantitatively analyzes the niches of main plant species of different community types in Mulinzi Nature Reserve. With each sample as a comprehensive resource, the Simpson index, Shannon-Wiener niche width formula and Pianka niche overlap formula are used to measure the niche breadth and overlap of main dominant species in the secondary forest communities with natural recovery of 20 years, 35 years and around 100 years, respectively. The niches changes of the main dominant species of different community types are compared and the reasons are analyzed. At the same time, the environment adaptability of the populations in different natural recovery phases are discussed. The results show that: 1) Cyclobalanopsis glauca belongs to the constructive species of the subtropical evergreen and deciduous broad-leaved mixed forest in Mulinzi Nature Reserve, having the maximum of niche breadth (in CommunityⅠ B'(SW)i is 0.750, B'(L)i is 0.863; in CommunityⅡ B'(SW)i is 0.630, B'(L)i is 0.685; and in Community Ⅲ B'(SW)i is 0.625, B'(L)i is 0.658) and high degree of niche overlap with other populations. The longer the natural recovery, the more obvious its dominant position. 2) Human disturbance and light are the main factors that affect the main dominant species niche changes of different community types in the area. 3) In different community types, the average niche breadth value of the main dominant species are: B'(SW)i is 0.603, B'(L)i is 0.570, and the average niche overlap value is 0.564. It shows that in all kinds of communities the ecological amplitudes and the resource utilization spectrums are wide, and the community structures are complex, and the competition of environmental resources between various groups is not fierce. 4) The importance value and niche breadth of Davidia involucrata are the lowest (The IV is 0.181, B'(SW)i is 0.292 and B'(L)i is 0.109). It has little or no overlap with other populations. It shows that its adaptability to the community environment and its resources utilization ability are weak, and it has a certain degree of differentiation with the ecological niche of other populations. The species composition of the community is not the same because of the different community structure and natural recovery, so the niche of the dominant populations in different community types in the main forest layer changes in this area. It reveals the rule that the niche of dominant species changes with natural recovery, which provides an important reference for the operation and management of this kind of forests.

Key words: community, important value, niche breadth, niche overlap, population

CLC Number: 

  • Q948.1