Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Sha...Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Shankou Forestry Station of Guangxi,China. The results showed that carbon content in different organs of T.flousiana ranged form 418.4 g·kg-1 to 516.4 g·kg-1,which was in order as follows:bark>branch>stem>root>leaf. The vertical distribution of carbon content within the stand was in the following order:tree layer>shrub layer>herb layer.Carbon content in the soil obviously declined with increased soil depth from 0 to 80 cm. Total carbon storage in the ecosystems was 159.37,194.21 and 278.22 t·hm-2,respectively for 8-year-old,14-yea-old and 28-yea-old stands. The tree layer in the three-age stands respectively accounted for 18.30%、28.37% and 43.59%;the shrub and herb layers for 0.14%、1.17% and 1.44%;the litter layer for 0.33%、0.89% and 1.11%;the soil for 81.23%、69.58% and 54.78% of the total storage of carbon. Carbon storage in different organs was roughly in proportion to the biomass of corresponding organ. For example,stem occupied the greatest proportion of carbon storage in the trees,up to 46.37%,and increased with the stand age while branches,leaves,bark and roots occupied more than 37.32%. The annual net productivity of the 8-year-old,14-year-old and 28-year-old T.flousiana plantation was respectively 8.93,10.82 and 12.53 t·hm-2a-1,and annual net carbon storage was respectively 4.19,5.07 and 5.93 t·hm-2a-1.展开更多
通过对滇池底泥118个样品的有机质含量分析统计和利用GIS绘制的底泥0～5cm,5～10cm,10～20 cm 3层有机质空间分布图,得出底泥中有机质含量的一般范围在40.00～90.00g/kg.滇池草海底泥中有机质含量明显大于外海含量;外海有机质垂直分布...通过对滇池底泥118个样品的有机质含量分析统计和利用GIS绘制的底泥0～5cm,5～10cm,10～20 cm 3层有机质空间分布图,得出底泥中有机质含量的一般范围在40.00～90.00g/kg.滇池草海底泥中有机质含量明显大于外海含量;外海有机质垂直分布呈明显规律性-随着深度的增加而递减,而草海的有机质垂直分布没有明显的规律;并分析了滇池底泥中有机质含量的环境意义,为治理滇池提供理论指导.展开更多
文摘Carbon accumulation and spatial distribution as well as their variations in three different age(8-year-old,14-year-old and 28-year-old) stands of Taiwania flousiana plantation ecosystem were investigated in Nandan Shankou Forestry Station of Guangxi,China. The results showed that carbon content in different organs of T.flousiana ranged form 418.4 g·kg-1 to 516.4 g·kg-1,which was in order as follows:bark>branch>stem>root>leaf. The vertical distribution of carbon content within the stand was in the following order:tree layer>shrub layer>herb layer.Carbon content in the soil obviously declined with increased soil depth from 0 to 80 cm. Total carbon storage in the ecosystems was 159.37,194.21 and 278.22 t·hm-2,respectively for 8-year-old,14-yea-old and 28-yea-old stands. The tree layer in the three-age stands respectively accounted for 18.30%、28.37% and 43.59%;the shrub and herb layers for 0.14%、1.17% and 1.44%;the litter layer for 0.33%、0.89% and 1.11%;the soil for 81.23%、69.58% and 54.78% of the total storage of carbon. Carbon storage in different organs was roughly in proportion to the biomass of corresponding organ. For example,stem occupied the greatest proportion of carbon storage in the trees,up to 46.37%,and increased with the stand age while branches,leaves,bark and roots occupied more than 37.32%. The annual net productivity of the 8-year-old,14-year-old and 28-year-old T.flousiana plantation was respectively 8.93,10.82 and 12.53 t·hm-2a-1,and annual net carbon storage was respectively 4.19,5.07 and 5.93 t·hm-2a-1.
文摘通过对滇池底泥118个样品的有机质含量分析统计和利用GIS绘制的底泥0～5cm,5～10cm,10～20 cm 3层有机质空间分布图,得出底泥中有机质含量的一般范围在40.00～90.00g/kg.滇池草海底泥中有机质含量明显大于外海含量;外海有机质垂直分布呈明显规律性-随着深度的增加而递减,而草海的有机质垂直分布没有明显的规律;并分析了滇池底泥中有机质含量的环境意义,为治理滇池提供理论指导.
