Relative importance of water, energy, and heterogeneity in determining regional pteridophyte and seed plant richness in China
Relative importance of water, energy, and heterogeneity in determining regional pteridophyte and seed plant richness in China
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DOI：
10.1111/j.1759-6831.2011.00120.x
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发表时间：
2011-03-01
影响因子：
3.7
通讯作者：
Xiao, Yi
中科院分区：
文献类型：
--
作者：
Chen, Sheng-Bin;Jiang, Gao-Ming;Xiao, Yi
环境变量，如环境能量，水的可用性，和环境异质性已被频繁地提出来解释物种多样性梯度。分类群特异性功能性状如何定义大尺度的丰富度梯度是理解物种多样性空间格局的一个基本问题，但尚未得到很好的记录。利用中国区域植物群的大型数据集，研究了蕨类植物和种子植物在空间分布格局和环境决定因素上的差异，这两种植物在扩散能力和环境要求上存在差异。蕨类植物丰富度显示出更明显的空间变异和更强的环境关联比种子植物丰富度。水分可利用性通常比能量和异质性更能解释蕨类植物和种子植物物种丰富度的空间变异，特别是对潮湿和阴凉环境具有高度依赖性的蕨类植物。因此，蕨类植物的丰富程度是间接影响与水有关的变量，这反过来又导致在较高的比例，蕨类植物在区域维管植物区系（蕨类植物比例）在潮湿的地区。种子植物丰富度、蕨类植物丰富度和蕨类植物比例的变异中，能量解释的变异大部分包含在水分和异质性解释的变异中，表明研究范围内能量的冗余。然而，异质性是更重要的决定种子植物分布。蕨类植物和种子植物的丰富程度是密切相关的，即使在环境的影响已经被删除，这意味着它们之间的功能联系。我们的研究强调了将不同分类群的生物学特征纳入宏观生态学和全球变化生物学研究的重要性。
Environmental variables, such as ambient energy, water availability, and environmental heterogeneity have been frequently proposed to account for species diversity gradients. How taxon-specific functional traits define large-scale richness gradients is a fundamental issue in understanding spatial patterns of species diversity, but has not been well documented. Using a large dataset on the regional flora from China, we examine the contrast spatial patterns and environmental determinants between pteridophytes and seed plants which differ in dispersal capacity and environmental requirements. Pteridophyte richness shows more pronounced spatial variation and stronger environmental associations than seed plant richness. Water availability generally accounts for more spatial variance in species richness of pteridophytes and seed plants than energy and heterogeneity do, especially for pteridophytes which have high dependence on moist and shady environments. Thus, pteridophyte richness is disproportionally affected by water-related variables; this in turn results in a higher proportion of pteridophytes in regional vascular plant floras (pteridophyte proportion) in wet regions. Most of the variance in seed plant richness, pteridophyte richness, and pteridophyte proportion explained by energy is included in variation that water and heterogeneity account for, indicating the redundancy of energy in the study extent. However, heterogeneity is more important for determining seed plant distributions. Pteridophyte and seed plant richness is strongly correlated, even after the environmental effects have been removed, implying functional linkages between them. Our study highlights the importance of incorporating biological traits of different taxonomic groups into the studies of macroecology and global change biology.