关键词: 生物量估算, 华北落叶松人工林, 生物量转扩因子, 生物量扩展因子, 根茎比

Abstract:

Biomass conversion and expansion factor (BCEF), biomass expansion factor (BEF) and root∶shoot ratio (R/S) of Larix principis-rupprechtii plantations in four typical regions (i.e. Guandi Mountain, Middle-alpine zone of Wutai Mountain, Basin zone of Wutai Mountain, and Saihanba Forest Region) were calculated, and then their heterogeneities were analyzed. Results showed that: 1) there was no statistical difference of mean BCEF between Guandi Mountain and Wutai Mountain (P>0.05), but the mean BCEF was greater than that in Saihanba Forest Region (P<0.05). Mean BEF in Middle-alpine zone of Wutai Mountain was greater (P<0.05) than that in the other regions among which there were no significant differences in BEF (P>0.05). BCEF value, as well as BEF, decreased and tended to stabilization with increasing stand age, mean DBH and standing volume. 2) there was no statistical differences of mean R/S among regions (P>0.05). R/S value had positive correlations with stand age and mean DBH (P<0.01), but had no significant correlations with standing volume and stand density. Based on these significant differences among regions, we recommend to select BCEF and BEF values in the given distribution regions. If possible, it is better to use the variable BCEF and BEF as functions of stand measured factors (e.g. stand age, mean DBH, and standing volume).

Key words: biomass estimation, Larix principis-rupprechtii plantation, biomass conversion and expansion factor, biomass expansion factor, root∶shoot ratio