于1985至1986年对南山马尾松林衰亡现象进行了研究,内容包括针叶受害症状、枝叶生长情况、针叶解剖、树干解析和根系观察等。濒死马尾松针叶呈现枯斑、枯尖或全叶枯黄;针叶组织破坏;针叶提前脱落;根系不发达,细根少;分枝减少;侧枝死亡;树干生长率下降。从树干解析可知,这种生长势减弱现象大约在十几年以前就已开始。初步研究结果启示,南山马尾松林衰亡可能与环境污染(如酸雨等)有关。 From 1985 to 1986, the decline of Pinus massoniana forest in Nanshan was studied, including the symptoms of coniferous trees, the growth of branches and leaves, the anatomy of needles, the analysis of trunk and the observation of root system. The moribund Masson pine needles showed dead spots, withered or yellowish brown leaves; the damaged tissue of needles; the needles came off earlier; the root system was underdeveloped with fewer fine roots; the branches decreased; the branches died; the growth rate of trunk decreased. From the tree trunk analysis we can see that this phenomenon of growth potential weakened about a dozen years ago has already begun. Preliminary findings suggest that the decline of Pinus massoniana Nanshan may be related to environmental pollution (such as acid rain, etc.).