中文摘要：

2007～2008年采用收割法，通过对5个本地种与5个欧美杨引进品系的杂交杨1～2年扦插苗生长初期的生物量进行测定，研究10个杂交杨生物量的分配规律。结果表明，杨树的地上生物量始终要高于地下生物量，与2007年相比，2008年NM6、DN182、NE19、1467、DN2、SIM和DA的地上生物量／地下生物量明显升高，变化范围为2％～50．03％，增长比例的绝对值最小的为JIA，最大的为DA和SIM；10个品系中，只有DN2在2007年比2008年分配更多光合作用固定的物质来生长茎。1262和P64分配更多的光合作用固定的物质用于地上部分的生长。JIA在2007年和2008年地上与地下生长分配比例几乎相等。地上部分叶片的干物质与全株干物质比重2007年要高于2008年。试验结果显示，杨树绝大多数品系在初期生长季内（2007年）将干物质的重量分配于地下的比例要高于地上部分；地上部分在初期的生长季内将更多的干物质分配于叶片的生长。

英文摘要：

By investigation the initial biomass growth of 10 poplar clones, the paper found the 10 poplar clones （the 5 native species and the 5 Populus x euramericana） biomass allocation characteristic rules by the harvesting method during the 2007 -2008 growth stage. The results showed that the aboveground biomass of poplars was al- ways higher than the below-ground biomass, and the total dry weight biomass was constantly growing. It was sig- nificantly increased that the aboveground biomass/belowground biomass value （A/B value） of NM6, DN182, NE19, I467, DN2, SIM and DA in 2008 year compared with 2007, within the range of 2 % to 50.03 %. The A/B value increasing absolute value of JIA was the smallest, and the proportion of DA and SIM was the largest. Only DN2 allocated the more photosynthetic material to grow stem in 2007 than in 2008. I262 and P64 allocated the more photosynthesis material to fix aboveground growth. JIA allocated the almost equal photosynthesis material to fix the aboveground biomass and belowground biomass in 2007 and 2008. Aboveground leave matter/the whole plant dry weight in 2007 was higher than in 2008. Test results showed that the vast majority of strains of poplargrowing season in early （2007） to the weight of dry matter distribution in the ground is higher than the proportion of aboveground, aerial part during the initial growing season （2007） will be more dry matter allocated to growth of leaves. During the early growing season poplar always allocated more the weight of the dry matter proportion to the underground part than the above ground part （2007 year）. The aerial parts allocated the much dry matter to the leaf growth （2007 year）. The result revealed the trend of poplar biomass growth allocation law during initial growth.