Short-Term Effect of Strip Clear-Cutting on Soil Organic Carbon Fraction and Carbon Stability of Cunninghamia lanceolata Plantations in Rainy Area of Western China
[Objective]The aim of this study was to determine the effects of different widths of cutting strip and reserving strip with the same harvesting intensity on soil carbon fractions and their stability.[Method]In the Rainy Area of Western China Plantation Ecosystem Permanent Scientific Research Base,using the catchment area as a functional unit,a 23-years-old Cunninghamia lanceolata plantation forest was harvested with the same 40%intensity in different widths,i.e.,S1(10 m cutting+15 m reserv-ing),S2(20 m cutting+30 m reserving),S3(30 m cutting+45 m reserving),respectively.And we col-lected soil samples one year after logging.[Result]① Cutting strip treatments significantly deceased soil organic carbon content in 0-20 cm soil layer;② In summer,the soil organic carbon stability of S2 harvesting strip in 0-40 cm soil layer was significantly higher than that of the other two bandwidths,while the S2 retention strip was significantly lower than that of the other two bandwidths.In winter,S1 was significantly higher than the other two bandwidths;③ Redundancy analysis showed that microbial biomass carbon had significant synergies with soil organic carbon and carbon fractions;④ There was a significant positive correlation between soil carbon stability and soil dissolved organic carbon and a sig-nificant negative correlation with active organic carbon fractions.[Conclusion]Under the 40%logging intensity,choosing S3 strip clear-cutting is more conducive to maintaining soil organic carbon content and stability.The results of our study can provide theoretical basis for the near natural transformation of C.lanceolata and forestry carbon sink management.
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