Chin J Plan Ecolo ›› 2015, Vol. 39 ›› Issue (7): 726-735.doi: 10.17521/cjpe.2015.0069

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Spatial analysis of competition in natural Phyllostachys edulis community

CHEN Yong-Gang1,2,*(), TANG Meng-Ping1,2, YANG Chun-Ju1,2, MA Tian-Wu1,2, WANG Li3   

  1. 1School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Lin’an, Zhejiang 311300, China
    2Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Lin’an, Zhejiang 311300, China
    3School of Information Engineering, Zhejiang Agriculture and Forestry University, Lin’an, Zhejiang 311300, China
  • Online:2015-07-22 Published:2015-07-01
  • Contact: Yong-Gang CHEN
  • About author:

    # Co-first authors

Abstract: Aims Spatial analysis of competition is an effective method to understand trend, variability and distribution patterns of plant communities. The objective of this study was to improve our understanding of autocorrelation distribution, the relationship between competition intensity and density and age of Phyllostachys edulis, and the relationship between competition intensity anisotropy and the aspect of sample plots. Methods Based on data collected from natural P. edulis forest plots located in Tianmu Mountain of Zhejiang Province, we calculated Hegyi competition index in Geographic Information System (GIS). ESDA (exploratory spatial data analysis) was used to analyze the spatial distribution of the Hegyi competition index to identify the spatial distribution. Spatial semivariogram and standard deviation ellipse were used to study regionalized spatial variability of variables. Important findings The results showed that the spatial densities and the competition intensity of natural P. edulis forest was autocorrelated: Phyllostachys edulis density was higher in area of high competition intensity. The age of P. edulis was also different between areas of different competition intensities: Phyllostachys edulis was younger in plots of low competition intensity than in plots of high competition intensity. The anisotropy of the competition intensity was higher in the vertical direction than in the horizontal direction.

Key words: anisotropy, Hegyi index, spatial autocorrelation, semivariogram, standard deviation ellipse, Phyllostachys edulis

Fig. 1

The curve of semivariograms. γ(h), semivariance; a, range; c, sagitta; C0, nugget; C0 + C, sill; h, distance."

Table 1

The V_Hegyi competition index of natural Phyllostachys edulis"

Diameter class (cm)
Percentage (%)
Maximum value
Minimum value
2-4 2 0.04 14.23 14.23 17.13 11.34
4-6 8 0.15 10.29 8.39 23.84 5.53
6-8 197 3.69 8.340 7.71 29.08 2.71
8-10 1 277 23.95 6.93 6.27 43.06 2.34
10-12 2 616 49.06 5.89 5.35 40.20 2.11
12-14 1 123 21.06 5.39 4.97 24.68 1.88
14-16 107 2.01 4.51 4.31 8.13 1.34
16-18 0 0 0 0 0 0
18-20 0 0 0 0 0 0
20-22 2 0.04 2.76 2.76 3.62 1.90

Table 2

Spatial autocorrelation and significance test of V_Hegyi index of Phyllostachys edulis community"

Getis-Ord General G 指标值 Index value 0.001 351
方差 Variance 0.000 000
Z值 Z value 51.894 764
概率p Probability 0.000 000
Moran’s I 指标值 Index value 0.332 195
方差 Variance 0.000 041
Z值 Z value 51.894 764
概率p Probability 0.000 000

Fig. 2

Getis-Ord Gi* hot spot analysis (A) and Kernel density estimation (B) of V_Hegyi competition index."

Table 3

The spatial distribution density of natural Phyllostachys edulis community in various areas with different competition intensity"

Competition intensity
Plant number
Area (m2)
Density (ind.·m-2)
低 Low 1 117 4 218.909 0.265
中 Medium 2 618 4 268.221 0.613
高 High 1 681 1 512.870 1.111

Table 4

The 2-samples t test of natural Phyllostachys edulis community age distribution in areas with different natural P. edulis competition intensities"

竞争强度 Competition intensity 平均值 Average (a) 对比 Comparison t统计量 t statistic 概率 Probability
低 Low 7.11 低-中 Low-medium -3.88 0.000
中 Medium 7.62 中-高 Medium-high -0.95 0.341
高 High 7.72 低-高 Low-high -4.33 0.000

Fig. 3

Semivariogram diagram of anisotropy of natural Phyllostachys edulis competition."

Fig. 4

The wind rose diagram of V_Hegyi index."

Fig. 5

The relationship between natural Phyllostachys edulis’s competition intensity and its aspect."

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