Forest Humus Type Governs Heavy Metal Accumulation in Specific Organic Matter Fractions
Jarosław Lasota , Ewa Błońska , Stanisław Łyszczarz , Mark Tibbett
AbstractSoils have the potential to accumulate heavy metals and the capacity to do so is strongly related the properties of each soil. Soil organic matter is a key factor in the retention, release, and bioavailability of heavy metals, and here we have determined the accumulation of heavy metals in various types of humus in the Rybnik Forest District in southern Poland. In a novel approach, we analyzed relationships between heavy metals within soil organic matter fractions and evaluated the role of organic fractions in mediating metal mobility. Specifically, we tested whether (i) the type of forest humus determines the heavy metal accumulation; (ii) heavy metals accumulation is associated with soil organic matter fractions; and (iii) heavy metals have an inhibitory influence on biochemical properties especially enzymes activity in different humus types. Four types of humus were sampled (mor, moder, moder-mull, mull), physically fractioned, and a number of chemical and biochemical properties were analyzed. Calculated geo-accumulation index (Igeo) and enrichment factor (EF) confirmed soil pollution with Cd and Pb. The type of humus differed in the accumulation of heavy metals, which is associated to the variable concentration of organic matter remaining at each decay class. We found no relationship between enzymatic activity and heavy metals concentration except for a positive correlation between urease activity and nickel concentration. Considering wider evidence, we propose a biogeochemical link between nickel deposition and the production of soil-borne urease in these forest soils.
|Journal series||Water Air and Soil Pollution, [Water, Air, and Soil Pollution], ISSN 0049-6979, e-ISSN 1573-2932, (N/A 70 pkt)|
|Publication size in sheets||0.6|
|Keywords in English||Enzyme activities, Forest soil, Light and heavy fraction of soil organic matter|
|ASJC Classification||; ; ; ;|
|License||Journal (articles only); published final; ; with publication|
|Publication indicators||= 0; : 2017 = 0.728; : 2018 = 1.774 (2) - 2018=1.963 (5)|
|Finansowanie||This research was financed by the Ministry of Science and Higher Education of the Republic of Poland and from the Scholarship Fund of the University of Agriculture for funding a scientific internship abroad.|
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