期刊
FUNCTIONAL ECOLOGY
卷 31, 期 2, 页码 520-529出版社
WILEY
DOI: 10.1111/1365-2435.12733
关键词
biodiversity-ecosystem function; cottonwood; genes-to-ecosystems; genotype diversity; Populus
类别
资金
- US National Science Foundation [DEB-0078280, DEB-0425908]
- Bureau of Reclamation [CESU-04FC300039, CESU-06FC300025]
- Direct For Biological Sciences
- Division Of Environmental Biology [1340852] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1126840] Funding Source: National Science Foundation
1. Numerous studies have demonstrated biodiversity-productivity relationships in plant communities, and analogous genetic diversity-productivity studies using genotype mixtures of single species may show similar patterns. Alternatively, competing individuals among genotypes within a species are less likely to exhibit resource-use complementarity, even when they exhibit large differences in their effects on ecosystem function. 2. In this study, we test the impact of genotype diversity and genetic identity on ecosystem function using an ecosystem-scale common garden experiment. Distinct tree genotypes were collected across the entire natural range of the riparian tree Populus fremontii in the USA, and grown in 1-16 genotype combination forest stands. Due to the warm climate and irrigation of the planting location along the Colorado River (AZ, USA), mature forest physiognomy with trees up to 19 m tall was achieved in just five years. 3. Several key patterns emerged: (i) genotype richness did not predict forest productivity, suggesting a lack of net biodiversity effects; (ii) we found differences among genotype monoculture stands comparable to differences in average productivity across all forest biomes on Earth; (iii) productivity was predicted based on genetic marker similarity in trees; (iv) genetic-based differences in leaf phenology (early leaf-on and late leaf-fall timing) were correlated with > 80% of the variation in tree and forest productivity irrespective of home-site conditions. 4. Large differences in productivity among genotypes can result in dramatic differences in forest productivity without resulting in diversity-productivity relationships that are present in species-scale biodiversity studies.
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