东北地区落叶松林碳固持能力及其影响因素OA

To clarify the differences in carbon sequestration capacity of Larix gmelinii forests along different latitudinal gradients and their influencing factors,Larix gmelinii forests at nine sites with different latitudes across the Daxing'an-ling,Xiaoxing'anling,and Changbai Mountains in Northeast China(Huanren,Helong,Lushuihe,Qinghe,Dailing,Wuying,Jiagedaqi,Xinlin,and Mohe)were selected as study subjects.Using a forest inventory method,vegetation car-bon density,soil organic carbon density,and annual carbon sequestration rate were quantified,and the influence of stand structure and climatic factors on carbon sequenstration capacity was analyzed.The results showed that vegetation carbon density and annual vegetation carbon sequestration rate across the nine sites ranged from 22.44-126.69 t/hm2 and 1.05-4.27 t C/(hm2·a),respectively,both exhibiting significant regional differences(P<0.05),with the Lesser Khingan Mountains showing the highest annual sequestration rate.Soil organic carbon contents at depths of 0-10 cm,10-20,20-30,30-40,and 40-50 cm ranged from 71.61-91.21,15.09-44.94,5.99-24.21,3.07-14.55 mg/g,and 2.55-11.96 mg/g,respectively.Soil organic carbon content decreased significantly with increasing depth,showing no significant differences among regions at 0-10 cm but significant differences at deeper layers.Soil carbon density and total carbon density ranged from 18.41-113.87 t/hm² and 40.89-219.81 t/hm²,respectively,both differing signifi-cantly among regions.Vegetation carbon density and annual carbon sequestration rate were significantly correlated with latitude,mean annual temperature,and mean diameter at breast height(P<0.05),but showed no correlation with an-nual precipitation(P>0.05).These findings indicate that favorable climatic conditions and stable stand structure en-hance the carbon accumulation capacity of larch forests.