植物生态学报 ›› 2014, Vol. 38 ›› Issue (4): 325-333.DOI: 10.3724/SP.J.1258.2014.00029
吴裕鹏1, 许涵1, 李意德1,*(), 骆土寿1, 陈德祥1, 林明献2, 杨怀2
收稿日期:
2013-11-14
接受日期:
2014-02-12
出版日期:
2014-11-14
发布日期:
2014-04-08
通讯作者:
李意德
作者简介:
*(E-mail:liyide@126.com)基金资助:
WU Yu-Peng1, XU Han1, LI Yi-De1,*(), LUO Tu-Shou1, CHEN De-Xiang1, LIN Ming-Xian2, YANG Huai2
Received:
2013-11-14
Accepted:
2014-02-12
Online:
2014-11-14
Published:
2014-04-08
Contact:
LI Yi-De
摘要:
以海南尖峰岭热带山地雨林为研究对象, 基于尖峰岭原始林60 hm2大样地, 分析了7个不同空间尺度(5 m × 5 m、10 m × 10 m、20 m × 20 m、40 m × 40 m、60 m × 60 m、80 m × 80 m、100 m × 100 m)、3个不同径级(胸径(DBH) ≥ 1.0 cm、DBH ≥ 2.5 cm、DBH ≥ 7.5 cm)物种丰富度与个体密度之间的关联性, 以期为负密度制约效应等研究的尺度选择提供参考依据。研究结果表明, 物种丰富度和个体密度之间的关联性是基于空间尺度存在的, 并受分析植株径级大小的影响。DBH ≥ 1.0 cm时, 在4个空间尺度下(5 m × 5 m、10 m × 10 m、20 m × 20 m、40 m × 40 m), 物种丰富度随个体密度增加而增加, 但物种丰富度和个体密度两者间的相关性随取样空间尺度的增大而逐渐下降; 在其他3个空间尺度下(60 m × 60 m、80 m × 80 m、100 m × 100 m), 两者间没有显著相关性。当DBH ≥ 2.5 cm和DBH ≥ 7.5 cm时, 物种丰富度和个体密度间的相关性随空间尺度变化的趋势也与上述结果基本一致; 在60 m × 60 m的空间尺度上, DBH ≥ 1.0 cm时物种丰富度和个体密度相关性不显著, DBH ≥ 2.5 cm和DBH ≥ 7.5 cm两个径级的物种丰富度和个体密度表现出弱相关性。DBH ≥ 2.5 cm和DBH ≥ 7.5 cm时, 各空间尺度下物种丰富度和个体密度之间的决定系数几乎一致, 但高于DBH ≥ 1.0 cm时两者之间的决定系数, 说明大径级植株的个体密度和物种丰富度之间有更强的关联性, 负密度制约效应和自疏效应可能是产生这种现象的主要原因。
吴裕鹏, 许涵, 李意德, 骆土寿, 陈德祥, 林明献, 杨怀. 海南尖峰岭热带山地雨林不同空间尺度和径级水平的物种丰富度与个体密度关联. 植物生态学报, 2014, 38(4): 325-333. DOI: 10.3724/SP.J.1258.2014.00029
WU Yu-Peng, XU Han, LI Yi-De, LUO Tu-Shou, CHEN De-Xiang, LIN Ming-Xian, YANG Huai. Associations between species richness and individual densities of varying spatial scales and diameter classifications in tropical montane rainforest in Jianfengling, Hainan Island, China. Chinese Journal of Plant Ecology, 2014, 38(4): 325-333. DOI: 10.3724/SP.J.1258.2014.00029
样方尺度 Scale of quadrat | 决定系数 Determination coefficient (R2) | p值 p-value | |||||
---|---|---|---|---|---|---|---|
DBH ≥ 1.0 cm | DBH ≥ 2.5 cm | DBH ≥ 7.5 cm | DBH ≥ 1.0 cm | DBH ≥ 2.5 cm | DBH ≥ 7.5 cm | ||
5 m × 5 m | 0.866 | 0.947 | 0.957 | <2e-16 | <2e-16 | <2e-16 | |
10 m × 10 m | 0.777 | 0.902 | 0.889 | <2e-16 | <2e-16 | <2e-16 | |
20 m × 20 m | 0.551 | 0.799 | 0.774 | <2e-16 | <2e-16 | <2e-16 | |
40 m × 40 m | 0.147 | 0.335 | 0.485 | 8.74e-10 | <2e-16 | <2e-16 | |
60 m × 60 m | 0.062 | 0.117 | 0.146 | 0.231 | 0.016 | 0.001 | |
80 m × 80 m | 0.068 | 0.006 | 0.106 | 0.321 | 0.345 | 0.244 | |
100 m × 100 m | 0.034 | 0.013 | 0.009 | 0.605 | 0.366 | 0.456 |
表1 个体密度和物种丰富度关联性的决定系数及显著性检验
Table 1 Determination coefficients and p values of the relationships between individual density and species richness
样方尺度 Scale of quadrat | 决定系数 Determination coefficient (R2) | p值 p-value | |||||
---|---|---|---|---|---|---|---|
DBH ≥ 1.0 cm | DBH ≥ 2.5 cm | DBH ≥ 7.5 cm | DBH ≥ 1.0 cm | DBH ≥ 2.5 cm | DBH ≥ 7.5 cm | ||
5 m × 5 m | 0.866 | 0.947 | 0.957 | <2e-16 | <2e-16 | <2e-16 | |
10 m × 10 m | 0.777 | 0.902 | 0.889 | <2e-16 | <2e-16 | <2e-16 | |
20 m × 20 m | 0.551 | 0.799 | 0.774 | <2e-16 | <2e-16 | <2e-16 | |
40 m × 40 m | 0.147 | 0.335 | 0.485 | 8.74e-10 | <2e-16 | <2e-16 | |
60 m × 60 m | 0.062 | 0.117 | 0.146 | 0.231 | 0.016 | 0.001 | |
80 m × 80 m | 0.068 | 0.006 | 0.106 | 0.321 | 0.345 | 0.244 | |
100 m × 100 m | 0.034 | 0.013 | 0.009 | 0.605 | 0.366 | 0.456 |
图1 7个空间尺度下个体密度和物种丰富度基于广义相加模型的拟合曲线。 A, 5 m × 5 m。B, 10 m × 10 m。C, 20 m × 20 m。D, 40 m × 40 m。 E, 60 m × 60 m。F, 80 m × 80 m。G, 100 m × 100 m。
Fig. 1 Fitted curves of the relationships between individual density and species richness by generalized additive model at seven spatial scales. A, 5 m × 5 m. B, 10 m × 10 m. C, 20 m × 20 m. D, 40 m × 40 m. E, 60 m × 60 m. F, 80 m × 80 m. G, 100 m × 100 m.
图2 不同空间尺度下不同径级个体密度和物种丰富度基于广义相加模型的拟合曲线。 A, 5 m × 5 m。B, 10 m × 10 m。C, 20 m × 20 m。D, 40 m × 40 m。E, 60 m × 60 m。F, 80 m × 80 m。G, 100 m × 100 m。a, DBH ≥ 1.0 cm; b, DBH ≥ 2.5 cm; c, DBH ≥ 7.5 cm。DBH, 胸径。
Fig. 2 Fitted curves of the relationships between stem density and species richness by generalized additive model at varying spatial scales and DBH classifications. A, 5 m × 5 m. B, 10 m × 10 m. C, 20 m × 20 m. D, 40 m × 40 m. E, 60 m × 60 m. F, 80 m × 80 m. G, 100 m × 100 m. a, DBH ≥ 1.0 cm; b, DBH ≥ 2.5 cm; c, DBH ≥ 7.5 cm. DBH, diameter at breast height.
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