桉树生物量估算差异的源解析

Abstract

Abstract:

Sustainable forest management on regional scales attributed to accurate biomass estimates, which were influenced by multiple biotic and abiotic factors. Combining forest inventory data with yield sampling, we calculated biomass accumulation of Eucalypt plantation in Nanjing, a county in Fujian, and presented spatial distribution of biomass differences between values using local biomass model gained in this study and default biomass model in many existing references. The source of differences and their relative contribution rates were analyzed using BRT (boosted regression trees) method. The result indicated that biomass accumulation calculated using default biomass model was overestimated by 20.88%, and the largest error source ascribed to stand conditions which accounting for 70.94% of biomass differences. Among all variables, stand age was dominant due to contributing 54.92% of biomass differences which declined along with stand age growth. In addition, abiotic factors had less effect on biomass differences with 29.06%; besides, elevation and soil depth were, respectively, the key variables among topography and soil factors.

Key words: biomass estimation, biomass model, influencing factors, Eucalypt plantation

CLC Number:

S718.55

Yan Jing, Luo Yunjian, Zheng Defu, Wang Shuicheng. Source Appointment of Differences in Biomass Estimates of Eucalypt Plantation[J]. Scientia Silvae Sinicae, 2014, 50(2): 92-98.

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Source Appointment of Differences in Biomass Estimates of Eucalypt Plantation

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