期刊
ECOLOGY
卷 88, 期 5, 页码 1328-1334出版社
WILEY
DOI: 10.1890/06-0989
关键词
carbon dioxide; coarse-root biomass; ground-penetrating radar; roots; scrub oak
类别
Growth and distribution of coarse roots in time and space represent a gap in our understanding of belowground ecology. Large roots may play a critical role in carbon sequestration belowground. Using ground-penetrating radar (GPR), we quantified coarseroot biomass from an open-top chamber experiment in a scrub-oak ecosystem at Kennedy Space Center, Florida, USA. GPR propagates electromagnetic waves directly into the soil and reflects a portion of the energy when a buried object is contacted. In our study, we utilized a 1500 MHz antenna to establish correlations between GPR signals and root biomass. A significant relationship was found between GPR signal reflectance and biomass (R-2 = 0.68). This correlation was applied to multiple GPR scans taken from each open-top chamber (elevated and ambient C0(2)). Our results showed that plots receiving elevated C02 had significantly (P = 0.049) greater coarse-root biomass compared to ambient plots, suggesting that coarse roots may play a large role in carbon sequestration in scrub-Oak ecosystems. This nondestructive method holds much promise for rapid and repeatable quantification of coarse roots, which are currently the most elusive aspect of long-term belowground studies.
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