Abstract:

The biomass, carbon storage and spatial distribution of 46-old-years (42-old-years to 51-old-years) Pinus massoniana nature secondary forest were studied in Tieshanping of ChongQing. The results showed that the total biomass is 142.06 t·hm^-2, the distributing sequence of the biomass of the forest ecosystem is: arbor layer(89.91%) > shrub layer(5.61％)>Standing litters(2.98％)> >herb(1.50％). The total organic carbon storage in forest ecosystem amounted to 197.78 t C·hm^-2, of which trees layer stored 76.06 t C·hm^-2 and accounted for 38.45%, shrub layer stored 3.55 t C·hm^-2 and accounted for 1.79%, herb layer stored 0.88 t C·hm^-2 and accounted to 0.44%, standing litters mass layer stored 2.34 t C·hm^-2 and accounted to 1.17%, and soil stored 114.96 t C·hm^-2 and accounted to 58.13%. The carbon storage in different organs was positively related to the biomass of corresponding organs. Stem accumulated the highest biomass, which also stored the highest carbon storage and comprised 75.06% of carbon storage in arbor layer. The annual net productivity of Pinus Massoniana trees was 9.01 t·hm^-2a^-1, and annual carbon storage was up to 4.49 t C·hm^-2a^-1, amounted CO₂ to 16.46 t CO₂·hm^-2a^-1.

Key words: carbon storage, carbon distribution, capability of carbon deposition, Pinus massoniana secondary forest, Tieshanping of ChongQing