Lower soil carbon stocks in exotic vs. native grasslands are driven by carbonate losses

Brian J. Wilsey, Xia Xu, H. Wayne Polley, Kirsten Hofmockel & Steven J. Hall
Global change includes invasion by exotic (non-native) plant species and altered precipitation patterns, and these factors may affect terrestrial carbon (C) storage. We measured soil C changes in experimental mixtures of all exotic or all native grassland plant species under two levels of summer drought stress (0 and +128 mm). After eight years, soils were sampled in 10 cm increments to 100 cm depth to determine if soil C differed among treatments in deeper soils....
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