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- Title
Species Richness Promotes Productivity through Tree Crown Spatial Complementarity in a Species-Rich Natural Forest.
- Authors
Xu, Yaozhan; Chen, Han Y. H.; Xiao, Zhiqiang; Wan, Dan; Liu, Feng; Guo, Yili; Qiao, Xiujuan; Jiang, Mingxi
- Abstract
Ecological theory suggests that species with complementary architectural and physiological traits can optimize crown packing to improve resource efficiency and promote ecosystem productivity in forest communities. However, empirical evidence of this prediction is rare in species-rich natural forests, as little is known about how crown spatial complementarity regulates community species richness-productivity relationship (SRPR). In this study, we measured tree architectural traits (stem diameter, height, crown depth and width) for 11,337 trees, and quantified species richness, functional diversity, crown spatial complementarity, soil fertility and forest productivity for 44 quadrats (20 m × 20 m per quadrat) in the Badagongshan 25 ha forest plot, central China. We tested bivariate correlations between species richness, crown complementarity, functional diversity and forest productivity. We employed linear mixed effects models to predict crown complementarity and examined its relationship with functional diversity. Finally, we applied structural equation modeling to quantify the mediation effects of crown complementarity on SRPRs. Species richness promoted crown complementarity and forest productivity. Crown complementarity varied across quadrats, with increases driven primarily by changes in tree height. Crown complementarity was positively related to functional diversity and forest productivity. Species richness increased with soil total phosphorus, while functional diversity decreased with soil bulk density. Forest productivity increased with soil organic carbon and total nitrogen, but decreased with bulk density. Crown complementarity partially mediated the positive effect of species richness on forest productivity, and the mediation effect was mainly through functional diversity. Our results suggest that the crown complementarity index accurately reflects the niche complementarity through light utilization and carbon reallocation. Our study emphasizes that species richness can promote crown complementarity, leading to greater forest productivity, which provides greater insight into the mechanical understanding of the SRPRs.
- Subjects
CHINA; FOREST productivity; FOREST biodiversity; SPECIES diversity; CROWNS (Botany); STRUCTURAL equation modeling; SOIL density; LIFE history theory
- Publication
Forests (19994907), 2022, Vol 13, Issue 10, p1604
- ISSN
1999-4907
- Publication type
Article
- DOI
10.3390/f13101604