Rhizospheric processes influencing the biogeochemistry of forest ecosystems

Nitrogen transformation in the rhizospheres of two subalpine coniferous species under experimental warming

“…This effect is thus called the rhizosphere priming effect (RPE). Processes that are largely controlled or directly influenced by roots are often referred to as rhizosphere processes (Gobran et al, 1998). Consequently, an alteration of the physical, chemical or biological characteristics of the soil around the roots is known as a rhizosphere effect (Phillips and Fahey, 2008).…”

The biological activity of soil in Norway spruce forests and in fern Athyrium distentifolium Tausch ex Opiz stands on deforested polluted sites in the Beskydy Mts.

“…The nutrient cycling in rhizosphere affects the nutrient uptake by plant roots, amount of rhizogenous exudates and interactions among microorganisms, which are important for maintaining the forest growth and ecosystem stability, especially in conditions poor in nutrients (Gobran et al 1998).…”

Temporal trends in chemical parameters of upland forest soils in southern Finland

“…In soils over 10 000 years old, changes in soil properties due to soil-forming processes are assumed to be minimal. Changes in soil properties related to tree stand ageing and growth can be explained on the basis of slower mineralization of organic matter due to cooler, moister soil (Bhatti et al 2000), and perhaps to the occurrence of deeper, longer-lasting soil frost caused by the shading of the tree canopies (Yli-Vakkuri 1960, Päivänen 1973, on the basis of nutrient accumulation in tree biomass, the exudation of acidic material (H + and organic compounds) by tree roots (Gobran et al 1998), the accumulation of acidic coniferous litter on and in the soil (Nihlgård 1971), and more acidic soil water percolating down through the forest floor (Alriksson and Olsson 1995, Brais et al 1995, Krause 1998, Griffiths and Swanson 2001. The organic layer becomes thicker, the organic and uppermost mineral soil layers become more acidic, and the nitrogen and base cation concentrations decrease (Tamminen 1991, Brais et al 1995.…”