马尾松是我国亚热带地区的主要造林树种,蓄积量在其分布的省份中均占主要地位。但其凋落物灰分含量低、油脂多、分解慢、酸性强,造成其纯林林地干燥、养分循环不良,地力衰退,林分生产力较低。因此,研究营造混交林多为人们所重视。黧蒴栲(Castanopsis fissa)是亚热带低山丘陵速生的常绿阔叶树,又是优良的水源涵 Pinus massoniana is the main afforestation species in the subtropical region of China, and its stock volume occupies a dominant position in the provinces it distributes. However, the ash content of litter is low, with more oil, slow decomposition and strong acidity, resulting in dryness of pure forest and poor nutrient circulation, soil fertility decline and low stand productivity. Therefore, the study to create mixed forest and more people attach importance. Castanopsis fissa is an evergreen broad-leaved tree growing in a subtropical hilly region and is an excellent source of water