3. China National Bamboo Research Center, Key Laboratory of Bamboo Forest Ecology and Resource Utilization of National Forestry and Grassland Administration, Hangzhou 310012, Zhejiang, China
Moso bamboo (Phyllostachys edulis) plantation is a unique forest type in China with significant carbon sequestration potential.The soil physicochemical properties,carbon mineralization and enzyme activities in Moso bamboo plantations subjected to different management measures (undisturbed (M0),extensively managed (M1) and intensively managed (M2)) were studied in comparison to those in a secondary broad-leaved evergreen forest (CK).The results showed that after reducing the human interference with bamboo forest,the soil nutrient contents increased.Compared with the control,the contents of soil total organic carbon (TOC),total nitrogen (TN),total phosphorus and soluble organic nitrogen as well as soil moisture content in the undisturbed and extensively managed bamboo plantations significantly increased,while the soil bulk density decreased.The soil β-Glucosidase,polyphenol oxidase and peroxidase activities in the 0~20 cm and 20~40 cm layers in the undisturbed and extensively managed bamboo plantations increased notably,but the activity of acid phosphatase decreased.The content of potential mineralizable organic carbon in each treatment ranged from 154 to 844 mg·kg-1,accounting for 0.82% to 2.44% of TOC.Compared with the control,the undisturbed management significantly increased the potential active carbon pool and cumulative carbon mineralization in the 0~20 cm and 20~40 cm layers,followed by the extensive management.Intensive management resulted in significantly higher soil carbon mineralization ratio than those in other treatments.In general,with the increase of management intensity,the soil physicochemical properties and enzyme activities decreased gradually and the organic carbon mineralization ratio increased steadily.Therefore,reducing human disturbance is conducive to enhancing soil fertility and facilitating the turnover of organic carbon in Moso bamboo plantations.
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[2]
Yang C B,Ni H J,Zhong Z K,et al. Changes in soil carbon pools and components induced by replacing secondary evergreen broadleaf forest with Moso bamboo plantations in subtropical China[J]. Catena,2019,180:309-319.
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