Biodiversity Science ›› 2020, Vol. 28 ›› Issue (3): 350-357.doi: 10.17520/biods.2019094

• Original Papers • Previous Article     Next Article

Interspecific association of woody plant species and community stability in the Eleutharrhena macrocarpa habitat

Shuaifeng Li1, 2, Xuedong Lang1, 2, Xiaobo Huang1, 2, Wande Liu1, 2, Jianrong Su1, 2, *(), Chonghua Xu3, Zhihong Li3, Fandi Xu4   

  1. 1. Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224
    2. The Puer Forest Ecosystem Research Station, National Forestry and Grassland Administration of China, Kunming 650224
    3. Administration of Taiyanghe Provincial Nature Reserve, Puer, Yunnan 665000
    4. Yunnan Agricultural University, Kunming 650201
  • Received:2019-03-21 Accepted:2019-06-01 Online:2019-10-22
  • Jianrong Su E-mail:jianrongsu@vip.sina.com

Eleutharrhena macrocarpa, an endangered liana species, experiences population regeneration barriers in natural environments. Due to its endangered status, this species has been heavily researched to understand the mechanisms behind its rarity. In this study, we studied E. macrocarpa populations in the tropical seasonal rainforest of Taiyanghe Provincial Nature Reserve in Pu’er City, Yunnan Province to find successful protecting methods for a wild plant species with extremely small populations. Utilizing various community stability and interspecific competition metrics (the Godron stability index, Chi-square analysis, Pearson correlation), the results showed that the woody plant populatios of tree layer indicated significant positive correlation based on the value of variance ratio more than one (test statistic W > χ0.05(29)). Similarly, the woody plant populations of shrub layer indicated that no significant negative correlation and the variance ratio is less than 1 (χ0.95(29) < W < χ0.05(29)). Further, Chi-square test indicated that no association species pairs represented the most populations in the tree and shrub layer, and the ratios of positive and negative correlations were 0.238 and 0.279, respectively. Simultaneously, association coefficient suggested that significant and extremely significant negative species pairs were more than positive species pairs, while Pearson correlation coefficient indicated that the ratios of the positive and negative correlation were 0.376 and 0.511, respectively. We found that the association relationship of most species pairs showed no significant correlation, which mean a relative stronger interspecific independence. Eleutharrhena macroarpa population has similar adaptive niche with most woody plant populations in the tree layer, and they survived together through effective resource utilization. However, Eleutharrhena macrocarpa population had stronger competition with some species in the shrub layer. In addition, intersection point of community stability (33.92, 66.07) in the vegetative community of Eleutharrhena macrocarpa habitat suggested that the community displayed a better stability. The stronger interspecific competition between dominant species and other species also suggested the vulnerability of tropical seasonal rain forest. Therefore, strict protection of the habitat was crucial to the regeneration of Eleutharrhena macrocarpa population and biodiversity conservation.

Key words: tropical seasonal rain forest, variance ratio, interspecific association, interspecific correlation, Godron stability index

Fig. 1

The fruits and community at the habitat of Eleutharrhena macrocarpa"

Table 1

The information of habitat community plots of Eleutharrhena macrocarpa"

序号 No. 经纬度 Locality 海拔 Elevation (m) 样地面积 Area (m2) 坡向 Slope aspect 坡度 Slope 郁闭度 Coverage (%)
1 22°32° N, 101°6° E 964 900 北 North 31° 70
2 22°33° N, 101°7° E 1,052 900 东 East 25° 75
3 22°32° N, 101°6° E 1,032 400 北 North 31° 80
4 22°34° N, 101°8° E 1,237 400 南 South 22° 80
5 22°36° N, 101°3° E 1,250 300 北 North 45° 70

Table 2

Chi-square test of woody plants in the tree layer and shrub layer"

联结类型
Association type
类型 Types 数值范围
Value range
乔木层 Tree layer 灌木层 Shrub layer
种对数
Species pair number
百分比
%
种对数
Species pair number
百分比
%
χ2检验
Chi-square test
无联结
No association
P > 0.05 643 78.41 848 85.66
正联结
Positive association
P < 0.01 15 1.83 12 1.21
0.01 < P ≤ 0.05 19 2.32 19 1.92
负联结
Negative association
P < 0.01 0 0 21 2.12
0.01 < P ≤ 0.05 143 17.44 90 9.09
联结系数
Association coefficient
正联结
Positive association
AC ≥ 0.6 49 5.98 17 1.72
0.2 ≤ AC < 0.6 151 18.41 96 9.70
0 < AC < 0.2 59 7.20 270 27.27
无联结
No association
AC = 0 24 2.93 0 0
负联结
Negative association
-0.2 ≤ AC < 0 13 1.59 49 4.95
-0.6 ≤ AC < -0.2 25 3.05 69 6.97
AC ≤ -0.6 499 60.85 489 49.39
总数 Total 820 100.00 990 100.00

Table 3

Pearson correlation coefficient of woody plants in the tree layer and shrub layer"

类型
Type
数值范围
Value range
乔木层 Tree layer 灌木层 Shrub layer
种对数 Species pair number 百分比 % 种对数 Species pair number 百分比 %
正相关
Positive correlation
P ≤ 0.01 51 6.22 43 4.34
P ≤ 0.05 20 2.44 37 3.74
P > 0.05 153 18.66 255 25.76
负相关
Negative correlation
P ≤ 0.01 0 0 5 0.51
P ≤ 0.05 1 0.12 22 2.22
P > 0.05 595 72.56 628 63.43
总数 Total 820 100.00 990 100.00

Fig. 2

Godron community stability in the habitat of Eleutharrhena macrocarpa"

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