Characteristics comparison of productivity and soil nutrient of Phyllostachys pubescens forest in Toutuo of Yuexi county, Anhui

In order to understand the relationship between soil nutrient and growth of Phyllostachys pubescens, an investigation was conducted to study the tending, non -tending pure P. pubescens stands, and P. pubescens and broadleaved mixed stand in Toutuo of Yuexi county, Anhui province of China. The results showed that there existed significant differences in growth and productivity of P. pubescens among the different stands. The mean diameter at the breast height (DBH) was from 10.02 to 12.35 cm. The mean stand density indices were ranged from 0.28 to 0.49. The productivity of P. pubescens stands in Toutuo was mediun to low. The total biomass of the tending stand (96.50 t/hm2) was the highest, followed by the mixed stand (81.39 t/hm2) and non tending stand (78.17 t/hm2). The biomass partition of both the mixed stand and the tending stand were ordered as stem>rhizome>root>foliage>branch, while the non-tending stand was ordered as stem>branch>rhizome>root>foliage. The concentrations of organic matter, total nitrogen, available phosphorus and potassiun in the different stands decreased with soil depth increasing. There was significant difference in nutrient concentrations in the same soil layer among the different stands. Correlation analysis demonstrated that the total biomass of different stands was positively correlated with soil organic matter content, total N, and available phosphorus. The mean DBH had a significant and positive correlation with organic matter content and available phosphorus in 0- 20cm soil layer, and mean stand density indices had a significant and positive correlation with organic matter in 0 -20 cm soil layer. This suggests that soil organic matter content is the key factor affecting bamboo P. pubescens stand productivity.