首页|The effects of functional diversity and identity (acquisitive versus conservative strategies) on soil carbon stocks are dependent on environmental contexts
The effects of functional diversity and identity (acquisitive versus conservative strategies) on soil carbon stocks are dependent on environmental contexts
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NSTL
Elsevier
Soil carbon (C) plays an important role in mediating global climate change and sustaining environmental condition. Although experimental studies primarily from grasslands revealed the positive effects of plant diversity on soil C storage, there is uncertainty about the directions and magnitudes of tree diversity and soil C relationships in natural forests. Using Canada's National Forest Inventory data from temperate to boreal forests, we examined the relationships between soil C stocks and tree functional diversity and identity, and how these relationships varied along environmental gradients (i.e., biomes, mean annual temperature, climate moisture index, and soil drainage). In contrast to the results from grassland experiments, we found a negative relationship between tree diversity and soil C stocks in temperate forests and a nonsignificant relationship in boreal forests. Moreover, soil C stocks increased with functional diversity in moist and poorly drained sites, but decreased in dry and welldrained sites within the temperate forest biome. Within the boreal biome, soil C stocks increased with functional diversity in warm climates, but decreased in cold climates. Our findings at the macro-ecological scale indicated that the positive effects of plant diversity might be the highest at the boreal-temperate forests' ecotone. In addition, within the temperate biome, tree communities with higher leaf nitrogen, phosphorus content and specific leaf area were associated with greater mineral horizon soil C stocks, especially in warm or well-drained sites. Our finding of the abiotic context-dependent relationships between soil C stocks and tree functional diversity and identity can guide forest management across different environmental conditions.
Functional traitCommunity-weighted mean trait (CWM)Water availabilityMean annual temperatureStress gradient hypothesisSoil C stock
Chen, Xinli、Hisano, Masumi、Taylor, Anthony R.、Chen, Han Y. H.
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Lakehead Univ, Fac Nat Resources Management, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
NSTL
Elsevier
