秦岭松栎混交林碳密度空间分布特征

Spatial Distribution of Carbon Density in Pine-Oak Mixed Forest of Qinling Mountain

通过野外调查和室内分析,对秦岭松栎混交林碳密度的空间分布特征进行了研究。结果表明:(1)松栎混交林生态系统碳密度为(231.79±8.46)t·hm-2,其中植被层、土壤层、凋落物层碳密度分别为(111.72±6.55)、(110.74±6.72)、(9.33±0.75)t·hm-2,分别占整个松栎混交林生态系统碳密度的48.20%、47.77%、4.03%。(2)乔木层碳密度为(97.54±5.67)t·hm-2,占植被层碳密度的87.31%,占整个生态系统碳密度的42.08%;乔木层碳密度中,树干所占比例最大,为47.32%。(3)松栎混交林乔木层年净生产力为(5.55±0.54)t·hm-2·a-1,年净固碳量为(3.04±0.32)t·hm-2·a-1,年净吸收CO2量为(11.14±0.75)t·hm-2·a-1。

Plot investigation combined with biomass measurement was conducted to test the spatial distribution of carbon density in an pine-oak mixed forest in the Qinling Mountain .The total carbon density （ TCD ） in the pine-oak mixed forest is （231.79±8.46）t· hm^-2, （111.72±6.55）t· hm^-2 in the vegetation, （110.74±6.72）t· hm^-2 in soil layer and （9.33± 0.75）t· hm^-2 in litter layer accounting for 48.20%, 47.77% and 4.03% of the TCD in the whole ecosystem, respec-tively.Carbon stock of trees is （97.54±5.67）t· hm^-2 accounting for 87.31%of the vegetation and 42.08%of the whole ecosystem.The stem accumulates 47.32%of the tree TCD in tree layer.The annual net primary productivity in pine-oak mixed forest ecosystem is （5.55±0.54）t· hm^-2· a^-1, annual carbon stock is （3.04±0.32）t· hm^-2· a^-1, and the CO2 uptake is （11.14±0.75）t· hm^-2· a^-1.