METAL CONCENTRATIONS IN AQUATIC MACROPHYTES AS INFLUENCED BY SOIL ANDACIDIFICATION

SPARLING DW LOWE TP

Dw. Sparling et Tp. Lowe, METAL CONCENTRATIONS IN AQUATIC MACROPHYTES AS INFLUENCED BY SOIL ANDACIDIFICATION, Water, air and soil pollution, 108(1-2), 1998, pp. 203-221

23

INGLESE

Article

Environmental Sciences","Water Resources","Metereology & Atmospheric Sciences

Water, air and soil pollution → ACNP

0049-6979

108

1-2

1998

203 - 221

ISI

0049-6979(1998)108:1-2<203:MCIAMA>2.0.ZU;2-J

Bioavailability of metals to aquatic plants is dependent on many facto rs including ambient metal concentration, pH of soil or water, concent ration of ligands, competition with other metals for binding sites, an d mode of exposure. Plants may be exposed to metals through water, air , or soil, depending on growth form. This paper examines the influence of soil type under two regimens of water acidification on metal uptak e by four species of aquatic macrophytes: smartweed (Polygonum sagitta tum), burreed (Sparganium americanum), pondweed (Potamogeton diversifo lius), and bladderwort (Utricularia vulgaris) in constructed, experime ntally acidified wetlands. Soil types consisted of a comparatively hig h-metal clay or a lower-metal sandy loam. Each pond was either acidifi ed to pH ca. 4.8-5.3 or allowed to remain circumneutral. Metal concent rations tended to be higher in the submerged bladderwort and pondweed than in the emergent burreed and smartweed. Soils were important to pl ant metal concentrations in all species, but especially in the emergen ts. Acidification influenced plant concentrations of some metals and w as especially important in the submerged pondweed. Bioaccumulation of metals occurred for Mn, B, Sr, Pa, and Zn, compared to soil concentrat ions.