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中文摘要：
该研究采用野外样地调查法,以塔里木河下游地区的胡杨为研究对象,以胡杨地上生物量与易测因子（胸径、树高）之间的关系模型为基础,依据监测样带胡杨状况,对研究区内胡杨生物量分布状况进行分析,并结合区域内胡杨林面积对胡杨总生物量进行了评估。结果表明：（1）胡杨生物量模型B=128.09（D2 h）0.6318（R2=0.892）,精度较高,并且验证的实测值与模拟值之间差异不显著（P〉0.05）,此模型可以用来对胡杨生物量进行评估。（2）随着离河道距离的增加,胡杨生物量呈减少趋势;胡杨生物量主要分布在离河道700 m以内的范围,占总生物量的91.37%。（3）塔里木河下游胡杨单位面积生物量为416.613kg·hm^-2,总生物量为2.474×10^4 t。
英文摘要：
Based on sample plot survey to the Populus euphratica in the lower reaches of Tarim River, we established the model between biomass and factors such as DBH and height; Besides, the distribution of biomass of P. euphratica was analyzed in the district; Finally, the total biomass was assessed based on the area of P. euphratica forest in the lower reaches of Tarim River. The results are as follows： （1） biomass model of P. euphratica： B=128.09（D^2h）^0.6318（R^2=0.892）,which was high in precision, and the discrepancy between measured value and simulated value was non significant （P〉0.05）, thus the model could be used to assess the biomass of P. euphratica. （2） The biomass presented a trend that the biomass declining was relevant to the distance from river; P. euphratica distributed within 700 m of river; and the biomass of this area accounted for 91.37% of total. （3） The biomass per unit area was 416.613 kg·hm^-2 in the lower reaches of Tarim river and the total biomass was 2.474×10^4 t.
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