Long term evolution of tree growth, understorey vegetation and soil properties in a silvopastoral system of northern Greece

Authors

  • S.F. Gakis Forest Directorate of Magnesia Prefecture, Regional Administration of Thessaly and Central Greece, 383 33 Volos, Greece
  • M.Z. Orfanoudakis Forest Soils Laboratory, Department of Forestry and Management of the Environment and Natural Resources, Democritus University of Thrace, 682 00 Orestiada, Greece
  • A.G. Papaioannou Laboratory of Forest Soils, Faculty of Forestry and Natural Environment, Aristotle University, 540 06 Thessaloniki, Greece
  • K.T. Mantzanas Laboratory of Rangeland Ecology, Faculty of Forestry and Natural Environment, Aristotle University, 540 06 Thessaloniki, Greece
  • V.P. Papanastasis Laboratory of Rangeland Ecology, Faculty of Forestry and Natural Environment, Aristotle University, 540 06 Thessaloniki, Greece
  • D.A. Alifragis Laboratory of Forest Soils, Faculty of Forestry and Natural Environment, Aristotle University, 540 06 Thessaloniki, Greece
  • D.G. Seilopoulos Laboratory of Forest Soils, Faculty of Forestry and Natural Environment, Aristotle University, 540 06 Thessaloniki, Greece
  • S.N. Kostakis Geotechnical Chamber of Greece, 546 31 Thessaloniki, Greece

DOI:

https://doi.org/10.15287/afr.2014.277

Keywords:

agroforestry, tree height, herbage biomass, soil macronutrients, arbuscular mycorrhizal fungi

Abstract

Tree growth, understorey characteristics and soil parameters were evaluated in a silvopastoral system in northern Greece at seven and twelve years after its establishment. The experiment was laid out in 1992 and included three understorey treatments (grass, legume and control- unsown), two tree species - sycamore (Acer pseudoplatanus L.) and Scots pine (Pinus sylvestris L.) and two tree spacings (2.5 x 2.5 m and 3.5 x 3.5 m). Tree height was taller in the control and in the dense stands while Scots pine had better growth but, higher mortality than sycamore in the both periods. In 2004, understorey vegetation was uniform under the three understorey treatments and a significant decrease in sward above ground biomass was recorded under the dense treatment, compared with the open stand. In the same year, organic C and N, Mg and K concentrations as well as arbuscular mycorrhizal fungi spore numbers were found significantly higher under sycamore than Scots pine plots in the 0-20 cm soil depth. The results show that, although understorey vegetation became uniform over time, the initial plant composition of the understorey treatments continued to affect tree growth, indicating the importance of the understorey vegetation at the establishment stage of silvopastoral systems. However, as time passed initial tree spacing started to affect tree growth and tree species, particularly sycamore to improve soil properties. These results indicate an evolution of the initial silvopastoral system to a forest.

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