tailieunhanh - Báo cáo lâm nghiệp: "Production and humus form development in forest stands established on agricultural lands – Kostelec nad Černými lesy region"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Production and humus form development in forest stands established on agricultural lands – Kostelec nad Černými lesy region. | JOURNAL OF FOREST SCIENCE 55 2009 7 299-305 Production and humus form development in forest stands established on agricultural lands - Kostelec nad Cernými lesy region V. Podrazsky1 J. Remes1 V. Hart1 W. Keith Moser2 1Faculty of Forestry and Wood Sciences Czech University of Life Sciences in Prague Prague Czech Republic 2 USDA Forest Service Northern Research Station St. Paul . ABSTRACT The afforestation of agricultural lands was carried out under different site and ecological conditions including lower and medium elevated localities. The present study documents the rapidity of accumulation of surface layers and their characteristics in stands of Scots pine Pinus sylvestris Norway spruce Picea abies birch Betula verrucosa and Douglas fir Pseudotsuga menziesii in the territory of the Training Forest Enterprise in Kostelec nad Cernými lesy at the altitude 430 m . on the site of nutrient-poor gleyed soils. The plots were compared with the neighbouring continuously forested site covered with old pine-spruce stand and with near-situated arable field. During the first roughly 40 years considerable changes were documented on the afforested plots. Forest-floor humus layers in the coniferous stands have already been formed the humus forms being more favourable compared with the old forest site. Acidification and loss of nutrients run in the upper mineral horizons. These processes were also responsible for the less favourable character of the forest soil in the old stand. Birch showed minor shifts of soil properties in the mineral horizon compared to the conifers the surface humus accumulation was not observed there yet. The lowest degradation among conifers was shown in Douglas fir intensively taking up deficient nutrients on the other hand. Keywords afforestation agricultural lands tree species forest-floor humus soil characteristics Afforestation and reforestation of agricultural land were a common feature in different historical periods in the Czech lands they