首页|Variation of Hg concentration and accumulation in the soil of maritime pine plantations along a coast-inland transect in SW Europe

Variation of Hg concentration and accumulation in the soil of maritime pine plantations along a coast-inland transect in SW Europe

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  • NETL
  • NSTL
  • Elsevier
Climatic conditions have been shown as a major driver of the fate of Hg in forest ecosystems at a global scale, but less is known about climatic effects at shorter scales. This study assesses whether the concentration and pools of Hg in soils collected from seventeen Pinus pinaster stands describing a coastal-inland transect in SW Europe vary along a regional climatic gradient. In each stand, samples of the organic subhorizons (OL, OF + OH) and the mineral soil (up to 40 cm) were collected and some general physico-chemical properties and total Hg (THg) were analyzed. Total Hg was significantly higher in the OF + OH than in the OL subhorizons (98 and 38 μg kg~(-1), respectively), favored by a greater organic matter humification in the former. In the mineral soil, mean THg values decreased with depth, ranging from 96 μg kg~(-1) in the 0-5 cm layers to 54 μg kg~(-1) in the deepest layers (30-40 cm), respectively. The average Hg pool (PHg) was 0.30 mg m~(-2) in the organic horizons (92% accu-mulated in the OF + OH subhorizons), and 27.4 mg m~(-2) in the mineral soil. Changes in climatic factors, mainly precipitation, along the coast-inland transect resulted in a remarkable variation of THg in the OL subhorizons, consistent with their role as the first receiver of atmospheric Hg inputs. The high precipitation rate and the occurrence of fogs in coastal areas characterized by the oceanic influence would explain the higher THg found in the uppermost soil layers of pine stands located close to the coastline. The regional climate is key to the fate of mercury in forest ecosystems by influencing the plant growth and subsequent atmospheric Hg uptake, the at-mospheric Hg transference to the soil surface (wet and dry deposition and litterfall) and the dynamics that determine net Hg accumulation in the forest floor.

MercuryPoolForest floorDepositionRainfall

Melissa Mendez-Lopez、Cristina Eimil-Fraga、Flora Alonso-Vega、Roque Rodriguez-Soalleiro、Esperanza Alvarez-Rodriguez、Manuel Arias-Estevez、Juan Carlos Novoa-Munoz

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Universidade de Vigo, Departamento de Bioloxia Vexetal e Ciencia do Solo, Area de Edafoloxia e Quimica Agricola, Facultade de Ciencias. As Lagoas S/n, 32004, Ourense, Spain, Campus da Auga, Universidade de Vigo, Laboratorio de Tecnoloxia e Diagnose Ambiental Rua Canella da Costa da Vela 12, 32004, Ourense, Spain

Unidad de Gestion Ambiental y Forestal Sostenible, Escuela Politecnica Superior de Ingenieria, Universidade de Santiago de Compostela. Rua Benigno Ledo S/n, 27002,Lugo, Spain

Depanamento de Edafologia y Quimica Agricola, Escuela Politecnica Superior de Ingenieria, Universidade de Santiago de Compostela, Rua Benigno Ledo S/n, 27002,Lugo, Spain

2023

10.1016/j.envres.2023.116155

Environmental research

Environmental research

EISCI
ISSN：0013-9351
年,卷(期)：2023.231(Pt.1)
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