Thinning operations increase the demographic performance of the rare subtree species Magnolia stellata in a suburban forest landscape

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To ensure the persistence of populations and species that maintain unique biodiversity in suburban landscapes, it is necessary to establish an efficient management system for abandoned suburban secondary forests. Thinning operations seem to be an effective management approach to inhibiting the progress of forest succession, which could lower the level of species diversity. To evaluate the effect of thinning operations on the demographic performance (growth, survival, and sexual reproduction) of the rare subtree species Magnolia stellata, we set up a field experiment and monitored the population dynamics over 9 years. The results revealed that stem survival and flower production per genet showed a decreasing trend in the nonthinned site. However, thinning operations increased the demographic performance, in particular the stem growth and survival rates as well as flower and seed production. The findings suggested that thinning operations may decrease the extinction probability of not only the targeted local population but also the metapopulation, because the thinned population serves as a better seed source. Thus, the creation of well-lit sites by thinning operations would be a useful conservation strategy for M.stellata.

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