关键词: 大型海藻, 枸杞岛, 光合荧光特性, 快速光曲线, 水下调制荧光仪

Abstract: Based on the historical observations of 48 national meteorological stations in Guangxi biodiversity conservation priority areas from 1961 to 2014, using the linear trend analysis method and climate change index, the climate change characteristics and risks were analyzed. The results showed that the climate tended to be warmer and drier in the biodiversity conservation priority areas as the temperature increased, while the rain days, relative humidity and sunshine hours all decreased. The average annual temperature increase rate was 0.155 ℃·10 a^-1. The decrease rates of annual rain days, relative humidity and sunshine hours were 4.0 d·10 a^-1, 0.7%·10 a^-1, and 4.3 h·a^-1, respectively. The lowtemperature days decreased while hightemperature days increased in some areas. Specifically, the reduction of lowtemperature days mainly occurred in Jiuwan Mountains, Nanling Mountains of Northern Guangxi, and Western Guangxi mountainous areas with primitive forests; the increase of hightemperature days mainly occurred in Western Guangxi mountainous areas with primitive forests, Western Guangxi karst mountainous areas, Daming Mountains, Jiuwan Mountains, and the coastal areas. Meanwhile, the increases of heavy rain days in autumn and winter and severe drought days mainly occurred in Western Guangxi karst mountainous areas, Daming Mountains, and the coastal areas. Among the three typical habitats for biodiversity in Guangxi, the karst areas were mostly affected by climate change, and suffered the greatest risk, followed by the coastal areas and islands. The primeval forest areas in Nanling Mountains of Northern Guangxi were stable in climate and had the lowest risk. More than 95% of the biodiversity conservation priority areas in Guangxi were at the middle or lower levels of risk, except Xilin, which was the only highrisk area.

Key words: Gouqi Island, macroalgae, rapid light curve, photosynthetic fluorescence characteristics, Diving-PAM