Study On Distribution Characteristics Of Biomass And Carbon Storage Of Camellia Gauchowensis Forest

Under the grim situation of global warming and the era of low-carbon economy,forest carbon sinks have become one of the core contents of current climate change and regional sustainable development research.However,the basic data of the researches on carbon storage of Non-Timber forest are seriously lacking,especially for Camellia gauchowensis.In this paper,field models were established to investigate the biomass of various components of C.gauchowensis,and the carbon content,carbon storage and the effect of nitrogen on forest carbon storage.These results could provide theoretical and technical support for the study and evaluation of carbon stocks of C.gauchowensis forests.The main findings were as follows:（1）The biomass regression models of various components of C.gauchowensis were significant at the 0.01 level with high correlation coefficients（R²=0.76～0.97）,Except for flower bud（due to its small and unstable carbon content）.（2）The order of average biomass allocation ratio of the organs of C.gauchowensis forests in the middle-aged forests was tree roots>trunks>leaves>branches>fruits>flower buds.All the biomass of various components increased with the basal diameter and the trunk grew fastest.The biomass per plant increased from 5.086 kg in the 4 cm diameter class to 33.630 kg in the 12 cm diameter class,i.e.,almost a sevenfold increase.（3）The total biomass of C.gauchowensis stand was 26.902 t·ha^-1.Among them,the trunk and root biomass were 8.646 t·ha^-1and 8.479 t·ha^-1,accounting for 32.139%and31.518%,respectively,which was followed by leaves,branches and fruits,and that of flower buds was the smallest.（4）The carbon contents of plants were different between basal diameters and various components in the same diameter.The average carbon content was 48.35%,which was49.65%for fruit and the lowest（46.60%）for root.（5）In the soil layer of 1 m depth of C.gauchowensis forest land,the soil carbon content decreased with the increase of soil depth,which was 26.550 g·kg^-1,11.017 g·kg^-1,6.678 g·kg^-1and 4.706 g·kg^-1for the soil layer of 0～20 cm,20～40 cm,40～60 cm and60～100 cm,respectively.（6）The carbon storage of C.gauchowensis plants increased with the diameter class,i.e.,the carbon accumulated continuously in plants during the growth.The distribution patterns of carbon storage of various organs were similar with those of biomass allocation.The average carbon storage per plant was 4.127 kg and that of flower buds was 0.431 kg.（7）The carbon density of C.gauchowensis forest was 144.538 t·ha^-1,which was12.857 t·ha^-1（accounting for 8.90%）and 131.681 t·ha^-1（accounting for 91.10%）for plant and soil,respectively.Among them,soil was the main component of the carbon density of C.gauchowensis.（8）The average nitrogen content of C.gauchowensis was 9.19%,and the nitrogen content was the highest（14.67%）for flower buds and the lowest（4.14%）for trunk.The average carbon to nitrogen ratio of the tree was 64.333.No significant correlation could be observed between the carbon content,nitrogen content and carbon to nitrogen ratio of various organs of C.gauchowensis.（9）The distribution patterns of soil nitrogen content in C.gauchowensis forest were consistent with those of carbon content,but the degree of decrease was smaller,which reduced from 6.840 g·kg^-1of 0～20 cm to 5.718 g·kg^-1of 60～100 cm.The carbon to nitrogen ratio of the soil also decreased from 3.871 of 0～20 cm to 0.821 of 60～100 cm.A significant positive correlation could be observed between carbon content and nitrogen content,and a significant correlation was found between carbon content and carbon to nitrogen ratio in C.gauchowensis forest.