不同林分密度毛竹林生态系统碳储量特征

为了解毛竹林生态系统碳储量特征和碳库分配格局，以浙江钱江源森林生态系统定位观测研究站庙山坞林场为例，对5种林分密度毛竹林碳储量进行了分析和比较。5种林分密度的毛竹林土壤有机碳含量随着土层深度的增加均表现逐渐减少的变化趋势；毛竹林系统中土壤层碳储量均为各个林分类型中密度最高的组分，范围为127.65~166.65 t/ hm²；乔木层碳储量为15.59~31.59 t/ hm²，林分Ⅳ和Ⅴ的乔木层碳储量显著高于其他林分(P<0.05)；五种林分灌草层和凋落物层碳储量均较少。随着林分密度的增加，毛竹林乔木层、土壤层和总系统碳储量也均增加。随着林分密度增加，毛竹林系统碳储量也逐渐增加，和其他森林生态系统相比，毛竹林生态系统碳储量仍略低，在不影响经济效益的情况下，建议再增加种植密度。

Characteristics of Carbon Storage in Phyllostulis pubescens Ecosystem with Different Stand Densities

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.