Chin J Plant Ecol ›› 2010, Vol. 34 ›› Issue (3): 309-315.DOI: 10.3773/j.issn.1005-264x.2010.03.008
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HUANG Jian-Xiong1,2, ZHENG Feng-Ying3, MI Xiang-Cheng1,*()
Received:
2009-07-18
Accepted:
2009-11-23
Online:
2010-07-18
Published:
2010-03-01
Contact:
MI Xiang-Cheng
HUANG Jian-Xiong, ZHENG Feng-Ying, MI Xiang-Cheng. Influence of environmental factors on phylogenetic structure at multiple spatial scales in an evergreen broad-leaved forest of China[J]. Chin J Plant Ecol, 2010, 34(3): 309-315.
Fig. 1 Topography of Gutianshan (GTS) forest dynamic plot. Topography of GTS forest dynamic plot indicates that the east-west axis of the plot is 600 m and the south-north axis of the plot is 400 m. The curved surface displays the altitude of the plot varies from 446.325 m (blue) to 714.902 m (red).
尺度 Scale (m) | 平均值 Mean value of NRI | 方差 Variance of NRI | t (df = 999) | p |
---|---|---|---|---|
5 | 0.3783599 | 0.9218890 | 12.4614 | < 2.2e-16 *** |
25 | 0.2316712 | 0.2107166 | 15.9596 | < 2.2e-16 *** |
50 | 0.4084871 | 0.1591331 | 32.3816 | < 2.2e-16 *** |
75 | 0.4100705 | 0.2843890 | 24.3166 | < 2.2e-16 *** |
100 | 0.2432730 | 0.5080883 | 10.7926 | < 2.2e-16 *** |
Table 1 Distributions of net relatedness index (NRI) values at five scales and one tail t-test of hypothesis that mean value of NRI is equal to zero
尺度 Scale (m) | 平均值 Mean value of NRI | 方差 Variance of NRI | t (df = 999) | p |
---|---|---|---|---|
5 | 0.3783599 | 0.9218890 | 12.4614 | < 2.2e-16 *** |
25 | 0.2316712 | 0.2107166 | 15.9596 | < 2.2e-16 *** |
50 | 0.4084871 | 0.1591331 | 32.3816 | < 2.2e-16 *** |
75 | 0.4100705 | 0.2843890 | 24.3166 | < 2.2e-16 *** |
100 | 0.2432730 | 0.5080883 | 10.7926 | < 2.2e-16 *** |
尺度(半径) Scale (radius) | 5 m | 25 m | 50 m | 75 m | 100 m |
---|---|---|---|---|---|
R2 | 0.06413 | 0.19160 | 0.29400 | 0.49530 | 0.73880 |
极显著因子数 No. of environmental factors which affect NRI significantly | 2 | 7 | 10 | 12 | 14 |
Table 2 Effects of environmental factors on net relatedness index (NRI) at different scales
尺度(半径) Scale (radius) | 5 m | 25 m | 50 m | 75 m | 100 m |
---|---|---|---|---|---|
R2 | 0.06413 | 0.19160 | 0.29400 | 0.49530 | 0.73880 |
极显著因子数 No. of environmental factors which affect NRI significantly | 2 | 7 | 10 | 12 | 14 |
尺度(半径) Scale (radius) | 5 m | 25 m | 50 m | 75 m | 100 m |
---|---|---|---|---|---|
p | 0.409 | 0.267 | 1.52e-05 *** | <2e-16 *** | <2e-16 *** |
R2 | 0.01859 | 0.16710 | 0.34410 |
Table 3 Effects of altitude on net relatedness index (NRI) by linear regression
尺度(半径) Scale (radius) | 5 m | 25 m | 50 m | 75 m | 100 m |
---|---|---|---|---|---|
p | 0.409 | 0.267 | 1.52e-05 *** | <2e-16 *** | <2e-16 *** |
R2 | 0.01859 | 0.16710 | 0.34410 |
Fig. 3 Net relatedness index (NRI) of samples against altitude at scale of radius of 100 m. The phylogenetic structure of communities turns from clustering to overdispersion with increasing altitude.
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