Chin Bull Bot ›› 2016, Vol. 51 ›› Issue (1): 49-57.doi: 10.11983/CBB14193

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Spatial Distribution Patterns and Association of Major Species in Elaeagnus mollis Communities

Qiang Xu, Jinzhi Lü, Yanming Miao*, Runcheng Bi*   

  1. Shanxi Normal University, Linfen 041000, China
  • Received:2014-11-15 Accepted:2015-03-04 Online:2016-02-01 Published:2016-01-01
  • Contact: Miao Yanming,Bi Runcheng E-mail:mym8207@126.com;sxrcbi@126.com
  • About author:? These authors contributed equally to this paper

Abstract:

Elaeagnus mollis was used as the object of study in the nature sanctuary of Yicheng County, Shanxi province, using O-ring statistics in point pattern analysis and Programita software. We studied the spatial distribution patterns and associations of E. mollis, Vitex negundo var. heterophylla and Rosa xanthina, the major species in E. mollis communities. Three populations showed significantly aggregated distributions at relatively smaller scales and random distributions at larger scales, and the degree of aggregation decreased with increasing spatial scales. Spatial associations among tree species were mainly found at smaller scales and gradually disappeared with increasing scales. E. mollis population size class I, II and III exist in significantly aggregated distribution at smaller scales; size class IV, V and VI in all scales showed random distributions. We found a positive correlation between E. mollis size class I, II and IV, and V and VI, whereas size class I and VI, and II and V exhibited a negative association at a given scale; adjacent size class presenting basic spatial associations was not significant.

Key words: Elaeagnus mollis, spatial pattern, point pattern analysis, spatial association

Figure 1

Species distribution in sample plot(A) Scatterplot; (B) Point pattern analysis"

Table 1

Spatial associations of species"

Species 1 Species 2 Scale (m)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Elaeagnus mollis Vitex negundo r + + + r r r r r r r + r r r r r r r r r r r r r r
E. mollis Rosa xanthina r r r r r r r r r r r + r r r r r r r r r r r r r r
V. negundo E. mollis r + + + r r r r r r r r r r r r r r r r r r r r r r
R. xanthina E. mollis r r r r r r r r r r + + r r r r r r r r r r r r r r

Figure 2

Scatterplot of spatial distributions of different classes of Elaeagnus mollis"

Figure 3

Results of point pattern analysis for four classes of Elaeagnus mollis(A) Class I; (B) Class II; (C) Class III; (D) Class IV; (E) Class V; (F) Class VI"

Table 2

Spatial associations of class"

Class Class Scale (m)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Class VI Class I r r r r r + r r r r - r r r r r r r r r r r r r r r
Class VI Class II r r r r r r r r r r r r r r r r r r r r r r r r r r
Class VI Class III r r r r r r r r r r r r r r r r r r r r r r r r r r
Class VI Class IV r + r r r r r r r r r r r r r r r r r r r r r r r r
Class VI Class V r r r r r r r r r r r r r r r r r r r r r r r r r r
Class V Class I r r r r r r r r r r r r r r + r r r r r r r r r r r
Class V Class II r r r r r r r r r r r + r r r r r r r r - r r r r r
Class V Class III r r r r r r r r r r r + r r r r r r r r r r r r r r
Class V Class IV + r r r + r r r r r r r r r r r r r r r r r r r r r
Class IV Class I r r r r r r r r + r r r r r + r r r r r r r r r r r
Class IV Class II r r r r r r r r r r r + + r r r r r r r r r r r r r
Class IV Class III r r r r r r r r r r r r r r r r r r r r r r r r r r
Class III Class I r r r r r r r r r r r r r r r r r r r r r r r r r r
Class III Class II + r r r + r r r r r r r r r r r r r r r r r r r r r
Class II Class I r r r r r r r r r r r r r r r r r r r r r r r r r r
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