Humus conditions of stands with different proportion of Douglas fir in the Hurky Training Forest District and Krtiny Training Forest Enterprise
2009
Mensik, L.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Ekologie Lesa | Kulhavy, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Ekologie Lesa | Kantor, P.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zakladani a Pesteni Lesu | Remes, M.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Ekologie Lesa
Soil chemical composition was evaluated in three stands of Douglas fir, spruce and spruce with beech at acid sites in the Hurky Training Forest District and at a meso-trophic site in the Krtiny Training Forest Enterprise, Czech Republic. The aim of the study was to evaluate: (i) reserves of forest floor, (ii) soil reaction, (iii) total content of C and N for the forest floor layers, iv) C/N ratio, and (v) the content of dissolved organic C (DOC). The lowest reserve occured in the Douglas fir stand at a mesotrophic site (25.0 t/ha), the highest accumulation occured in the spruce stand and in the spruce/beech stand at the acid site (79.4-79.6 t/ha). The soil reaction was strongly acid to acid. The most favourable values of pH at acid (4.6+/-0.4) and mesotrophic sites (5.2+/-0.4) occurred in the Douglas fir stand. It also corresponded to C/N ratio (23-26). The highest C reserve occurred at the acid site 34.7 t/ha (1.3 t/ha nitrogen). The lowest reserve of C in forest floor at the mesotrophic site amounts to 8.5 t/ha (0.4 t/ha N). The higher content of DOC in stands at acid sites can result in a higher risk of soil acidification.
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