Carbon Storage and Distribution Pattern of Pinus massoniana Plantations Ecosystem in Different Forest Ages in Guangxi
In order to clarify the differences in carbon sink mechanism and carbon sequestration capacity of dif-ferent forest ages of Pinus massoniana,based on the sample plot survey,this study selected the method of space instead of time,and selected the P.massoniana plantation ecosystem with roughly similar site condi-tions and different forest ages(6,19,32,58 a)as the research object.The biomass was estimated according to the harvest method and the method of establishing the biomass model of each organ.The soil samples of 0-60 cm soil layer were collected to determine the organic carbon content of each layer of the ecosystem,so as to estimate the carbon storage of the ecosystem.The results showed that the contents of organic carbon in the shrub layer,litter layer and root system of P.massoniana plantations at different stand ages showed an in-creasing trend,while the herb layer showed the opposite trend.The overall organic carbon content of each layer showed litter layer＞shrub layer＞herb layer＞root system.The carbon storage of the ecosystem showed an increasing trend,and the over-mature forest increased significantly by 144.14%.Among them,the variation of carbon storage in tree layer,litter layer,root system and soil layer was consistent with that of e-cosystem,while that in shrub layer and herb layer was opposite.The contribution rate of carbon storage in vegetation layer increased,while the contribution rate of carbon storage in soil layer decreased,and there was no significant change in litter layer.The annual net carbon sequestration of young and middle-aged forests was higher than that of young and middle-aged forests,indicating that the carbon sequestration capacity of P.massoniana plantation was strong and had a relatively high biological productivity level.Close-to-nature res-toration can further enhance the carbon sequestration capacity of P.massoniana plantations of different forest ages.Improving vegetation layer biomass and soil carbon content,enhancing soil carbon sequestration capaci-ty,optimizing forest structure,maintaining high productivity and reducing human disturbance are important measures to improve the carbon sink function of P.massoniana plantation ecosystem.
Pinus massoniana plantationsecosystemcarbon storagedistribution patternforest age
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