秦岭松栎混交林碳密度空间分布特征1）

摘要

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.%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。