. The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees).... The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees) and clear cut method (for shrub,herb and inter layer plants). 1)The biomass distribution by organs was ranked as stems>branches>roots>leaves. 2)As the succession proceed, the percentages of stem and root biomass increased gradually, the percentage of leaves obviously decreased, and the percentage of branches fluctuated slightly; the dorminant species T. orientalis was replaced gradually by other species,that made the biomass distribution by species appeared to have a characteristics of relative dispersion;the biomass distribution by DBH class showed that biomass was mainly determined by the amounts of larger DBH class trees;the percentage of the tree biomass to the total community biomass gradually increased, the percentages of the shrub and herb layers remarkably decreased and the percentage of the inter-layer plants increased slightly .展开更多
The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59...The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59%. Among them the content of linoleic acid is 69.24%.展开更多
文摘. The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees) and clear cut method (for shrub,herb and inter layer plants). 1)The biomass distribution by organs was ranked as stems>branches>roots>leaves. 2)As the succession proceed, the percentages of stem and root biomass increased gradually, the percentage of leaves obviously decreased, and the percentage of branches fluctuated slightly; the dorminant species T. orientalis was replaced gradually by other species,that made the biomass distribution by species appeared to have a characteristics of relative dispersion;the biomass distribution by DBH class showed that biomass was mainly determined by the amounts of larger DBH class trees;the percentage of the tree biomass to the total community biomass gradually increased, the percentages of the shrub and herb layers remarkably decreased and the percentage of the inter-layer plants increased slightly .
文摘The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59%. Among them the content of linoleic acid is 69.24%.
