论文部分内容阅读
通过对珠江口花岗岩海岛-东澳岛小流域水体离子的实测分析,揭示海岛小流域的离子来源与贡献量,获得在相对封闭环境下的热带海岛地区花岗岩小流域的化学风化速率及过程对大气CO2的年消耗量.研究表明,东澳岛溪水总体为弱碱性,总溶解固体均值为68.14 mg·L-1,远低于世界河流均值,非汛期溶解固体和电导率均高于汛期.溪水离子组成以Cl-、溶解Si、Na+以及HCO-3为主,体现了海盐沉降和硅酸盐岩化学风化过程对溪水化学组成的共同影响.东澳岛岩石化学风化速率和CO2消耗通量分别为1.09×104kg·km-2·a-1和1.12×105mol·km-2·a-1,均低于世界河流均值,主要是由于花岗岩抗风化能力较强所致.广东省热带花岗岩海岛年碳汇消耗CO2约5218 t,因此保护海岛表层土壤和生态环境对海岛的碳汇作用具有重要意义.
Through the measurement and analysis of water ions in the Pearl River estuary granite island - Dong’ao Island watershed, the source and contribution of ions in the island watershed are revealed, and the chemical weathering rates and their responses to the atmosphere in the granite small watershed in the tropical island region under the relatively closed environment are obtained The results show that the Dongao Island is generally weakly alkaline with total dissolved solids of 68.14 mg · L-1, which is much lower than that of the world’s rivers. The dissolved solids and conductivity of non-flood season are higher than those of flood season. The ion composition of the stream water is dominated by Cl-, dissolved Si, Na + and HCO-3, which reflects the common influence of sea salt deposition and chemical weathering of silicate rocks on the chemical composition of streams.The petrochemical weathering rate and CO 2 flux of Dongao Island 1.09 × 104kg · km-2 · a-1 and 1.12 × 105mol · km-2 · a-1, respectively, which are lower than the average of the world’s rivers, mainly due to the strong ability of anti-weathering of granite.The tropical granite island The annual carbon sink consumes about 5218 t CO2, so it is of great significance to protect the island’s surface soil and environment from carbon sinks.