杭州木荷次生林生物量的研究

On the Biomass of Secondary Sckima superba Forest in Hangzhou

杭州西湖山区北高峰南坡的木荷次生林的生物量、生长量及凋落量的调查结果表明:①林分总生物量为134.113t/hm^2,其中活植物体126.649t/hm^2;②总生物量各个层次分配比例为:乔木层80.16％,更新层5.67％,灌木层3.84％,草本层4.76％,枯落物层5.57％;③在乔木层中,干、枝和叶的生物量分别分53.591,16.996和4.835t/hm^2,占地上部分的70.95％,22.50％和6.40％,根生物量18.474t/hm^2,占该层生物量的29.76％;④全林年生长量18.474t/hm^2,乔木层12.598t/hm^2,占68.19％,更新层1.948t/hm^2,占10.54％;⑤年平均凋落量5.848t/hm^2,叶凋落量占79.49％。2～4月和8～9月分别是凋落的两个高峰季节。

The results of the investigation about the biomass, the increment and the quantity of the litter of secondary Schima superba forest on the south slop of Beigao mountain in Hangzhou were as follows: (1) The tatal biomass of the stand was 126.649 tons per hectare in which the tree stratum, regeneration layer, shrub layer, field layer and the litter layer accounted for 80.16, 5.67, 3.84, 4.76 and 5.57 percent respectively. (2) In the tree stratum,the biomass of boles,branches and leaves were 53.591,16.996 and 4.835 tons per hectare and made up 70.95, 22.50 and 6.40 percent of the biomass above the ground. The biomass of roots was 18.474 tons per hectare which accounted for 29.76 percent of the biomass below the ground. (3) This forest had the annual increment of 18.474 tons per hectare in which the increment of tree stratum and regeneration layer made up 68.19 percent and 10.54 percent. (4) Annual quantity of litter weithted averagely 5.848 tons per hectare in which the leaves were 79.49 percent. There were two top periods of the litter: one was from February to April and another was from August to September.