Effects of planting spacing configurations and clones on carbon storage in poplar plantations
To understand the effects of clones and planting spacing on carbon storage in poplar plantations,the impacts of four planting spacings(6 m×6 m,4.5 m×8.0 m,5 m×5 m,and 3 m×8 m)for NL-895 and 6 m×6 m spacing for two clones(NL-95,and NL-797)on carbon storage in the plantations were investigated using the direct harvesting of forest biomass method.A significant difference in single tree biomass was evident among the investigated plantations(P<0.05).The highest biomass(400.96 kg·tree-1)occurred in the 6 m×6 m stand of NL-895.No significant variation was observed in biomass production per area among the four planting spacings for NL-895.The stand biomass production was significantly greater in clones NL-895 and NL-95 than in NL-797 at a planting spacing of 6 m×6 m(P<0.05).The carbon content in the poplar components ranged from 39.79%to 47.76%in the order stem>branch>root>leaf.The variation tendency of poplar carbon storage was similar to the biomass production of the plantations.The highest and lowest tree carbon storage was observed in the NL-895 plantation with a planting spacing of 6 m×6 m and 3 m×8 m,respectively.Soil carbon storage in the top 1 m accounted for approximately 71.7%of the total carbon storage.However,no obvious variation in soil carbon storage was detected among plantations.The total carbon storage among the plantations differed significantly with the four planting spacings in NL-895(P<0.05).By contrast,no significant difference was observed among the plantations with the three poplar clones at 6 m×6 m spacing.Overall,the highest carbon storage of 192.46 t·hm-2 was obtained in the 6 m×6 m plantation of NL-895;this level was 1.17-,1.31-,and 1.38-times the levels in the plantations with 4.5 m×8.0 m,5 m×5 m,and 3 m×8 m spacings,respectively.The collective findings indicate that using the clone NL-895 as the planting material and establishing a plantation with an even planting spacing of 6 m×6 m are optimal management patterns for carbon sequestration forests at similar sites in Jiangsu Province.
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