The Role of Climate Niche, Geofloristic History, Habitat Preference, and Allometry on Wood Density within a California Plant Community
The Role of Climate Niche, Geofloristic History, Habitat Preference, and Allometry on Wood Density within a California Plant Community
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DOI：
10.3390/f11010105
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发表时间：
2020-01
期刊：
影响因子：
2.9
通讯作者：
R. Nelson;E. Francis;J. Berry;W. Cornwell;L. Anderegg
中科院分区：
文献类型：
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作者：
R. Nelson;E. Francis;J. Berry;W. Cornwell;L. Anderegg
研究要点：为了更好地了解群落内木材密度的变化，我们的研究表明，除了全球分析中使用的气候-木材密度相关性之外，还需要更细微的方法。背景和目的：全球荟萃分析表明，较高的木材密度与较高的温度和较低的降雨量有关，而特定地点的研究解释了木材密度随结构限制和异速生长的变化。在区域范围内，气候和结构需求在多大程度上解释了木材密度的模式存在不确定性。我们探索了物种气候生态位、地理区系历史、栖息地专门化和异速生长对加州森林/沙帕拉尔群落内木材密度变化的作用。材料和方法：我们收集了加州森林中20种乔木和灌木的树种木材密度、气候生态位、地理区系历史和河岸栖息地专门化的数据。结果：河岸树种木材密度与地径高比呈负相关，非河岸树种木材密度与地径高比无相关性。与以前的研究相比，我们发现气候信号与木材密度之间的关系很弱，除了木材密度与物种湿润范围边缘的干燥程度之间存在正相关关系外(湿润范围边缘越干燥的物种木材密度越高)。然而，木材密度与物种干燥范围边缘的干旱程度并不相关。地理植物区系历史对现代加州植物群落的木材密度或气候生态位没有直接影响。结论：在加州植物群落中，异速生长影响河岸专家的木材密度，但非河岸植物被过度建造，因此木材密度与树冠结构无关。同时，木材密度与物种干旱生态位的关系挑战了我们关于高木材密度作为一种耐旱性状的适应意义的经典假设。
Research Highlights: To better understand within-community variation in wood density, our study demonstrated that a more nuanced approach is required beyond the climate–wood density correlations used in global analyses. Background and Objectives: Global meta-analyses have shown higher wood density is associated with higher temperatures and lower rainfall, while site-specific studies have explained variation in wood density with structural constraints and allometry. On a regional scale, uncertainty exists as to what extent climate and structural demands explain patterns in wood density. We explored the role of species climate niche, geofloristic history, habitat specialization, and allometry on wood density variation within a California forest/chaparral community. Materials and Methods: We collected data on species wood density, climate niche, geofloristic history, and riparian habitat specialization for 20 species of trees and shrubs in a California forest. Results: We found a negative relationship between wood density and basal diameter to height ratio for riparian species and no relationship for non-riparian species. In contrast to previous studies, we found that climate signals had weak relationships with wood density, except for a positive relationship between wood density and the dryness of a species’ wet range edge (species with drier wet range margins have higher wood density). Wood density, however, did not correlate with the aridity of species’ dry range margins. Geofloristic history had no direct effect on wood density or climate niche for modern California plant communities. Conclusions: Within a California plant community, allometry influences wood density for riparian specialists, but non-riparian plants are ‘overbuilt’ such that wood density is not related to canopy structure. Meanwhile, the relationship of wood density to species’ aridity niches challenges our classic assumptions about the adaptive significance of high wood density as a drought tolerance trait.