Characteristics of Soil Nutrients and Carbon Storage of Eucalyptus Plantations at Different Ages
[Objective]To study the status of soil nutrients and carbon storage in Eucalyptus plantations of different forest ages in order to provide data reference for further utilizing Eucalyptus plantation resources in Guangxi.[Method]Taking eucalyptus plantations of different forest ages(6-year-old,12-year-old,18-year-old)in Guangxi Weidu Forest Farm as an example,the changes of soil nutrients and carbon storage distribution characteristics of Eucalyptus plantations at different forest ages were studied,and the soil fertility and carbon storage of Eucalyptus plantations were evaluated.[Result]The soil bulk density of Eucalyptus plantations increased with the increase of soil depth.The soil bulk density of 6-year-old,12-year-old,and 18-year-old plantations was 1.232,1.164 and 1.249 g/m3 respectively.The soil pH values of Eucalyptus stands were weakly acidic;The content of soil organic matter was 11.36-46.69 g/kg,and gradually increases from bottom to top among soil layers,with significant differences.The contents of total P and available P in soil were 0.15-0.22 and 0.23-2.01 mg/kg,respectively.There was no significant difference in total P among soil layers,while the content of available P was the opposite.The content of total P and available P in soil decreased with the deepening of soil layer among different forest ages.The vertical distribution of carbon storage in Eucalyptus plantations of different forest ages had significant differences.The carbon storage in the ecosystem of 6-year-old,12-year-old,and 18-year-old Eucalyptus plantations was 89.976,151.331 and 154.552 t/hm2,respectively.[Conclusion]The soil layer is the main part of carbon storage in the Eucalyptus plantation ecosystem,accounting for more than 75%.There is a significant P deficiency in different forest ages,and the amount of P fertilizer should be increased.
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万方数据
