Abstract:Leaf discoloration peak period (LDP) was an important phenological index at the end of plant growth season. In order to explore the influence of climatic factors on LDP of plants in Macao, China, the LDP annual changes of five wild plants and their responses to various climatic factors were studied based on the phenological and meteorological data of three phenological monitoring sites in Macao from 2012 to 2018. The results showed that the LDP varied among species, which Sapium idscolor, Toxicodendron succedaneum and Homalium cochinchinenense were in December, Sterculia lanceolata and Ilex asprella were in May and January, respectively. The LDP varied among monitoring sites, which I. asprella in Big Taipa Hill was significantly earlier than that in Ka Ho Hill, while that of Sterculia lanceolata in Guia Hill was obviously earlier than that in Big Taipa Hill. The LDP was positively correlated with the temperature in spring and summer, while negatively correlated with that in autumn and winter. The LDP was positively correlated with precipitation in winter and spring, while negatively correlated with that in summer and fall. The relative humidity was also significantly correlated with the LDP of these five species. Temperature was the most important climatic factor on the LDP of these five species.
