Abstract:

In order to understand the characteristics of carbon storage and the distribution pattern of carbon pool in Phyllostulis pubescens ecosystem, P. pubescens forests with five typical stand densities were selected in Miaoshanwu Forest Farm of Qianjiangyuan Forest Ecosystem Positioning Observation and Research Station in Zhejiang Province. The carbon storage in the P. pubescens ecosystem was analyzed. The analysis showed that, among the 5 P. pubescens stand densities, the soil organic carbon content decreased with the increase of soil depth. Soil layer carbon storage was the highest component of carbon storage of all stand types, ranging from 127.65 t/hm² to 166.65 t/hm². The carbon storage in the arborous layer was from 15.59 t/hm² to 31.59 t/hm², and the arborous layer in stand density IV and V had significantly higher carbon storage than that in other stand densities (P<0.05); and the carbon storage in the shrub-herb layer and litter layer was less. With the increase of stand density, the carbon storage of arborous layer, soil layer and the total ecosystem of P. pubescens also increased. In conclusion, with the increase of stand density, the carbon storage of P. pubescens ecosystem increases gradually. Compared with other forest ecosystems, the carbon storage of P. pubescens ecosystem is still slightly lower, and it is recommended to increase the planting density without affecting the economic benefit.

Key words: Phyllostulis pubescens forest, organic carbon, stand density, carbon storage