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西德森林面积为720万公顷,1971—1976年小头直径大于7厘米的大径材平均年伐量为3600万立方米,这相当于1360万吨绝对干燥的生物量,整个生物量潜能的获得和利用,可以采取以下几种主要方式:①主伐所得的大径材的利用;②主伐大径材的残留物,包括枝丫、树、树皮、伐根、针阔叶和树根;③抚育伐所得的大径材和残留物;④抚育幼林和过密幼树所得的细径材和树枝;⑤每年的落叶;⑥每年的灌木和草本植物凋落物.据计算,伐区作业的废材和凋落物相当于990万吨绝对干燥生物量.这些物质可在经营中加以利用.但上述生物量
The forest area of West Germany is 7.2 million hectares. The average annual cut of large-diameter timber with a small head diameter of more than 7 cm from 1971 to 1976 was 36 million cubic meters per annum, which is equivalent to 13.6 million tons of absolutely dry biomass. The total biomass potential The main ways to obtain and use are: ① the use of large-diameter timber obtained from the main cutting; ② the residues of the main timber of large-diameter timber, including branches, trees, bark, stump, conifer and tree roots; ③ Large diameter timber and residues obtained from tending and tending; ④ thinning timber and branches obtained from young and young trees; ⑤ annual deciduous leaves; ⑥ annual shrubs and herbaceous litter. The material and litter are equivalent to 9.9 million tonnes of absolute dry biomass, which can be used in the operations, but the biomass