Fig. 1

Distribution of Masson pine sample sites across the subtropical China. The distribution of Masson pine forests in China can be divided into four subregions, namely, the north-subtropical, middle-subtropical, south-subtropical, and other climate zones (such as mid-temperate zone). However, the fourth subregion had less than 1% of the stand volume of Masson pine in China and was thus not included in this study (SFA 2012)