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The Use of Mineral Nutrients for Biomass Production by Young Birch Stands and Stands Vitality in Different Forest Growing Conditions

引用

Journal of Environmental Science and Engineering(B) 2015年第4期4卷 177-189页

作者： Mudrite Daugaviete Ausma Marija Korica ingars silins Arvids Barsevskis Andis Bardulis Arta Bardule Kaspars Spalvis Marts Daugawetis Department of Forest Regeneration and Establishment Latvian State Forest Research Institute "Silava " Salaspils L V-2169 Latvia Department of Forest Products Processing Latvian State Forest Research Institute "Silava " Salaspils L V-2169 Latvia Department of Entomology Latvian State Forest Research Institute "Silava" Salaspils LV-2169 Latvia Rector of Daugavpils University 13 Vienibas Street Daugavpils LV-5401 Latvia

The data of field studies about mineral nutrient content in the biomass components of young birch stands (9-15 years old) in different forest growing conditions and soil types have been analyzed. In forest growing conditions on fertile soils (ASG, TSC and SP) the total amount of biomass produced by young birch stands divides into fractions as follows: stem wood 51.8%-59.5%; branch wood 9.8%-12.4%; foliage 5.7%-6.8%; stump wood and roots 25%-30%. In forest types on lean soils (TP) the same indices are 32.3%-41.8%, 18.2%-24.2%, 13.2%-16.1% and 26.8%-27.4%, respectively. The stand performance closely correlates with the basic nutrient (P, N, K, C and Mg) availability in forest soils. In lean typicpodzol soils (TP) the content of mineral nutrients is no higher than 20%-48% of that in more fertile soils (ASG, TSC and SP). In young birch stands the take-up of mineral nutrients from 0-40 cm soil layer for developing the above-ground biomass makes a fairly small proportion of the total: up to 4.8%-6.2% for P; 4.9%-12.2% for N; 1.1%-4.1% for K; 11.6% for Ca; 0.8%-7.7% for Mg; in leaner soils the same indices are P 0.1%-0.4%, N 1%-1.5%, K 0.2%-0.6%, Ca 0.1%-0.9%, Mg 0.1%-0.8%, respectively. The analyses of pest damages in young birch stands confirm a hypothesis that the degree of pest damage depends on the stand vitality as described by the site index.

关键词：森林类型地上生物量生长条件矿质养分营养物质生产活力土壤类型

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