Abstract
Elemental allelopathy, which depends upon elevated soil metal concentrations under metal-hyperaccumulating plants, may provide a competitive advantage for hyperaccumulators.We tested whether metal enrichment of litter and surface soil occurs under metal hyperaccumulators, using the New Caledonian Ni hyperaccumulator tree species Sebertia acuminata. We selected 11 Sebertia trees, pairing each with a nearby similar-sized tree of a non-hyperaccumulator species. We collected samples of litter, surface soil (0-5 cm depth), and subsurface soil (15-20 cm depth) from locations under the canopy of each tree. Elemental concentrations of litter and soils were quantified for 12 elements (Ni, Mg, Ca, K, P, Cu, Fe, Mn, Zn, Co, Cr and Pb). Litter under lIgSebertial/Ig contained significantly more Ni than litter under non-hyperaccumulator trees (31 000 vs 6300 µg/g, respectively), but was lower in Mg. Nickel was significantly higher in surface soil under S. acuminatal/Ig trees (100 vs 65 µg/g), as was Pb (but Cr was lower). Subsurface soil differed significantly only for Pb, which was higher under lIgSebertial/Ig trees. Since, as the literature suggests, metal hyperaccumulators are more tolerant of elevated soil metal concentrations, litter and surface soil Ni levels under the canopy of lIgSebertial/Ig trees may provide an ecological advantage for metal-hyperaccumulating plants.
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Claims 7
Claim · model-written summary
Litter under Sebertia had more Ni than litter under non-hyperaccumulators.
Verbatim
e0“Litter under lIgSebertial/Ig contained significantly more Ni than litter under non-hyperaccumulator trees (31 000 vs 6300 µg/g, respectively)”
Claim · model-written summary
Litter under Sebertia had less Mg.
- Taxon
- Sebertia acuminata
Pycnandra acuminatat0 - Outcome
- Mge0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but was lower in Mg”
t0“Sebertia acuminata”
Claim · model-written summary
Surface soil under Sebertia had more Ni.
Verbatim
e0“Nickel was significantly higher in surface soil under S. acuminatal/Ig trees (100 vs 65 µg/g)”
Claim · model-written summary
Surface soil Pb was higher under Sebertia.
- Taxon
- Sebertia acuminataPycnandra acuminatat0
- Outcome
- Pbe0
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as was Pb”
e1“Nickel was significantly higher in surface soil under S. acuminatal/Ig trees (100 vs 65 µg/g)”
t0“Sebertia acuminata”
Claim · model-written summary
Surface soil Cr was lower under Sebertia.
- Taxon
- Sebertia acuminataPycnandra acuminatat0
- Outcome
- Cre0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but Cr was lower”
t0“Sebertia acuminata”
Claim · model-written summary
Subsurface soil differed only in Pb, which was higher under Sebertia.
Verbatim
e0“Subsurface soil differed significantly only for Pb, which was higher under lIgSebertial/Ig trees”
Claim · model-written summary
Elevated litter and soil Ni may give metal hyperaccumulators an ecological advantage.
Verbatim
e0“litter and surface soil Ni levels under the canopy of lIgSebertial/Ig trees may provide an ecological advantage for metal-hyperaccumulating plants”