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为了解新疆山区森林的主要阔叶树种疣枝桦与欧洲山杨各组织器官生物量分配的规律及准确预估其生物量,研究基于整株收获实测数据采用统计回归的方法分析了2树种生物量分配格局和估测模型。结果表明:整体上2树种地上生物量比例分别为76.52%、75.42%,平均根冠比分别为0.307和0.341,在不同林龄不同径阶各器官生物量分配疣枝桦和欧洲山杨均表现为树干比例最高,树叶最低,在幼龄林和胸径0~20cm树根大于树枝,但在中龄林和胸径20cm以上疣枝桦表现为两者接近而山杨表现为树枝大于树根;运用最小二乘法和根茎比方法建立了2树种地上和地下各器官生物量估测的单因子胸径模型和胸径、树高双因子结合模型,结果显示疣枝桦地上部分和树干生物量预估精度显著提高,尤其树干生物量胸径树高的双因子模型比胸径单因子模型预估精度提高了11.3%,但树冠、树枝和树叶生物量各评价指标改进效果不大,而欧洲山杨树干、树冠和树枝生物量评价指标改进显著,精度提高2%~4%,树叶生物量估测反而降低,地上总生物量估测精度几乎没变,2树种地下生物量模型估测精度分别是81.35%%和83.87%。2树种不同器官生物量分配均表现为树干>树根>树枝>树叶,随着林龄和径阶的变化各器官生物量比例的变化趋势一致;优选出2树种各器官最优生物量模型,预估精度均在80%以上,可以满足日常生产需求。
In order to understand the regularity of biomass allocation in different tissues of Warty Betulaceae and Populus euphratica, a major broad-leaved tree in the mountainous area of Xinjiang, and to accurately estimate the biomass of the two species, we studied the biomass of two tree species Distribution pattern and estimation model. The results showed that the aboveground biomass of the two species was 76.52% and 75.42% respectively, and the average ratio of root to shoot was 0.307 and 0.341, respectively. The highest proportion of the trunk, the lowest leaves, young trees and DBH 0 ~ 20cm tree roots larger than the branches, but in the middle age and DBH 20cm above the warty Betula show close to each other and aspen branches appear more than the roots; use The least square method and rhizome ratio method were used to establish the single factor DBH model and the DBH and tree height two factor combination model of aboveground biomass and underground biomass of two tree species.The results showed that the prediction accuracy of aerial part and trunk biomass of the warty Betula sinica was significant However, the evaluation index of crown, branch and leaf biomass did not improve much, but the Populus trichocarpa, crown and branch of European poplar The biomass assessment index improved remarkably, the accuracy increased by 2% ~ 4%, the leaf biomass estimation decreased but the estimation accuracy of aboveground biomass had almost no change. The accuracy of estimation of underground biomass model 81.35 %% and 83.87%. The biomass allocation of different organs of tree species showed the trend of trunk biomass> tree> tree> tree> leaf, with the change trend of biomass and biomass of different organs at the same age. Estimated accuracy are more than 80%, to meet the daily production needs.