塔里木河下游胡杨生物量及其空间分布特征

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(D 2 h)0.6318(R 2=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416.613 kg·hm-2,总生物量为2.474×104 t。%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 2 h)0.6 3 1 8 (R 2 =0.892),which was high in precision,and the discrep-ancy 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 41 6.613 kg·hm-2 in the lower reaches of Tarim river and the total biomass was 2.474×10 4 t.