Abstract
Abstract Silvicultural practices are an important determinant of tree growth and stand structure. However, the potential advantages of long-term forest management, i.e., mixing valuable non-N 2 -fixing broadleaf tree species, such as Castanopsis hystrix Miq., with Masson pine ( Pinus massoniana Lamb.) to increase stand growth and ecosystem carbon storage, remain poorly understood. In this study, we assessed tree growth, aboveground carbon accumulation, and belowground carbon sequestration in 26-year-old monocultures of C . hystrix ( 100 C 26 ), 26-year-old monocultures of P . massoniana ( 100 P 26 ), 50-year-old monocultures of P . massoniana ( 100 P 50 ), and even- and uneven-aged ( 50 C 26 + 50 P 26 and 50 C 26 + 50 P 50 , respectively) mixed plantations. Carbon storage within the total ecosystem and in the tree and soil layers of 50 C 26 + 50 P 50 mixed plantations was significantly greater than values predicted based on the means of the 100 C 26 and 100 P 50 monoculture plantations ( p 50 C 26 + 50 P 26 mixed plantation soils. These results indicate that plantations of uneven-aged mixtures of P . massoniana and C . hystrix promote carbon sequestration via positive interactions.
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