TAILIEUCHUNG - Biomass and Remote Sensing of Biomass Part 3

Tham khảo tài liệu 'biomass and remote sensing of biomass part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ecological Aspects of Biomass Removal in the Localities Damaged by Air-Pollution 31 This problem was illustrated by the example of the forest stands of substitute tree species blue spruce European larch and common birch which were established in the Krusné hory Mts. Czech Republic on the sites where the declining Norway spruce monocultures could not be replaced by ecologically suitable tree species due to continual air pollution impact and damaged forest soils. On the basis of presented study we can conclude Despite the former and current air-pollution load and in the case of larch stand raking of forest floor before planting the amount of aboveground biomass produced by substitute 20-22-year-old blue spruce larch and birch stands is comparable with the results observed in similar stands on the other undisturbed sites. Above-ground biomass represents important pool of nutrients in the frame of nutrient cycle of observed forest ecosystems. Forest-floor contains low amount of Ca and Mg under observed stands regardless of different history . both on sites with removal of former forest-floor before planting larch stand and on sites with continual forest-floor blue-spruce and birch . Only exception was found under larch stand for content of Mg in forest-floor but it was probably caused by previous liming. Dry mass of annual litter-fall 2-5 is comparable with the results observed in similar stands in other undisturbed sites. Nutrients N P and K from annual litter-fall represent 1-3 compared to total nutrient stock in forest-floor. In the case of larch stand creating a new forest-floor these values were higher for N and K 14-16 . On the other hand amount of Mg in litter-fall represents 3-7 compared to amount in forest-floor. For Ca results were different. Under birch stand about 8 of Ca was returned by annual litter-fall. For larch stand removal of forest-floor before planting this value reached 35 . Under blue spruce stand amount of Ca from annual litter-fall .

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