光叶楮沿海造林当年生物量调查

对江苏海门沿海当年造林的光叶楮生长及生物量调查结果表明:3种立地条件下,造林密度为1 m×1 m时,在林业站苗圃脱盐立地(全盐量0.046%,pH8.15)地上部分生物量干重最大,为8 981.40 kg/hm2,其次在盐碱地东灶港海堤(全盐量0.286%,pH9.09),为6 478.20 kg/hm2,最差在杨树混交林地(全盐量0.098%,pH9.05)为1 846.95 kg/hm2.地下部分的规律与地上部分类似,干重最大是林业站苗圃,为5 158.65 kg/hm2,其次在东港海堤,为1 948.95 kg/hm2,最差在杨树混交林地,为662.40 kg/hm2.总生物量干重最大在林业站苗圃,为14 140.20 kg/hm2,其次在东灶港海堤,为8 427.195 kg/hm2,最差在杨树混交林地,为2 509.39 kg/hm2.根系主要分布在10 cm浅土层.

Investigation of the former year biomass of Broussonetia papyrifera(L.) Vent.for coast afforestation

The growth condition and biomass of one year old Broussonetia papyrifera plantation was investigated in Haimen,Jiangsu province.The results showed that the aboveground biomass was the highest(8 981.40 kg/hm2) in forestry station nursery(salinity 0.046%,pH 8.15).At Dongzaogang seawall site(salinity 0.286%,pH 9.09),the biomass of Broussonetia papyrifera plantation was 6 478.20 kg/hm2 which was taken the second place.The biomass of Brussonetia papyrisfera mixed Poplar forest(salinity 0.098%,pH 9.05)was the lowest,which was only 1 846.95 kg/hm2.The belowground biomass was similar to that of the aboveground.The maximum of root dry weight was found in forestry station nursery(5 158.65 kg/hm2),which was followed by Dongzaogang seawall(1 948.95 kg/hm2),and the biomass of Broussonetia papyrifera mixed Poplar forest was the lowest(662.40 kg/hm2).Compared the dry weight of the total biomass,the biomass of Broussonetia papyrifera in forestry station nursery was the highest among the three sites which reached 14 140.20 kg/hm2.The biomass of Broussonetia papyrifera in Dongzaogang seawall(8 427.19 kg/hm2) was higher than that of Broussonetia papyrifera mixed Poplar forest 2 509.39 kg/hm2.The roots distributed mainly at depth of 0~10 cm soil layer.