研究了中短轮伐期杨树纸浆林ＬＡＩ的动态变化，ＬＡＩ与透光率的关系，林分的生物生产力及林分的经济生物量生产．结果表明，ＬＡＩ随林龄和密度的增大而递增，３个杨树无性系间是ＮＬ８０３５１＞Ｉ６９＞Ｉ７２；ＬＡＩ与透光率的关系可用Ｍ．Ｍｏｎｓｉ和Ｔ．Ｓａｅｋｉ修正的消光方程来描述，消光系数为０．８１８；林分地上部分年净生物生产力与ＬＡＩ密切相关，其关系可用指数函数来表达；４年生时，不同密度及不同无性系间林分的生物生产力、生物量分配模式存在较大差异，以１１１１株·ｈｍ－２林分的生产力最高，约为５００株·ｈｍ－２林分的１４倍．３个无性系中以ＮＬ８０３５１最高，Ｉ７２杨最低；林分地上部分干木质部、枝木质部及皮的干物质累积趋势可用Ｒｉｃｈａｒｄｓ方程描述．４年生时，作为化学浆材的林分经济生物量是１１１１＞８３３＞６２５＞５００株·ｈｍ－２，作为磨木浆材的林分经济生物量是５００＞６２５＞８３３＞１１１１株·ｈｍ－２．无性系间均以ＮＬ８０３５１的林分经济生物量最高，Ｉ７２杨最低． The dynamic changes of LAI, the relationship between LAI and light transmittance, biomass productivity of stand and economic biomass production of stands were studied. The results showed that LAI increased with age and density, and the relationship among the three poplar clones was NL80351> I69> I72. The relationship between LAI and light transmittance was available. Monsi and T. Saeki modified extinction equation to describe the extinction coefficient of 0.818; aboveground part of the net annual net biological productivity and LAI are closely related, the relationship can be used to express the exponential function; 4-year-old, different densities and different clonal stands Biomass productivity and biomass allocation patterns were quite different. The highest productivity was 1111 plants · hm-2, which was 14 times of that of 500 plants · hm-2. Among the three clones, NL80351 was the highest, while I72 was the lowest. The dry matter accumulation trend of the dry xylem, branch xylem and peel in the aerial part of the forest can be described by the Richards equation. 4 years old, the economic biomass of stands as chemical pulp was 1111> 833> 625> 500 plants · hm-2, and the economic biomass of the wood pulp was 500> 625> 833> 1111 plants · hm -2. Clones with NL  80351 all the highest economic biomass, I  72 Yang minimum.