Abstract
In order to comprehend the characteristics of the abandoned bamboo stands, the allometry formula and the aboveground biomass of P. pubescens, P. bambusoides and P. nigra were determined and subsequently the structure of abandoned bamboo stands were investigated. We revealed that the allometric correlations between the diameter at breast height (DBH) with dry weight of stem, branch and leaf of these species. There were close relationships between DBH and the dry weight of stem, based on the field verification. However, there were not so close relationships between DBH and dry weight of branch and leaf. The aboveground biomass was calculated using these allometric correlations to correlate DBH and dry weight of stem, branch and leaf. The structure of the abandoned bamboo stands was uniformed if compared to the managed bamboo stands, where the characteristics of aboveground biomass, standing density and ratio of dead bamboo varied at the investigated bamboo stands. The standing density of the abandoned bamboo stands was larger than that of the managed bamboo stands. However, the aboveground biomass of the abandoned bamboo stands was lower than that of the managed bamboo stands. On the abandoned bamboo stands which dominated by P. pubescens, the increase of degree of ruin caused the increase of aboveground biomass. It likewise was observed on the abandoned bamboo stands which dominated by P.bambusoides, the raising of degree of ruin lead to the raising of standing density.
