Characteristics of Carbon Sequestration in Macadamia Trees During Their An-nual Growth Cycle—Taking a 9-Year-Old Tree Densely Planted as an Example
The object of this study was to reveal the characteristics of the carbon fixation ability of macadamia trees during the annual growth cycle.The dry matter accumulation and carbon content of the new aboveground organs of the two densely planted 9-year-old macadamia varieties(H2 and Guire No.1)during the annual growth cycle were measured.The key results are shown as follows:The average value of the carbon content in the aboveground new organs was 42.1％,and that of the new flushes,inflorescences,and fruits was 42.1％,40.9％,and 42.2％,respectively,and that of the inflorescences was the lowest.The annual carbon accumulation of densely planted 9-year-old macadamia trees was 8 828.6 g·plant-1,equivalent to 6.30 t per hectare;The carbon accumulation of new flushes,inflorescences,and fruits accounted for 51.6％,2.8％,and 45.6％of the total carbon accumulation in aboveground new organs,respectively.The carbon accumulation of the late autumn flushes,the winter flushes,the spring flushes,the mid-summer flushes,and the late-summer flushes covered 2.1％,0.9％,14.1％,29.6％,and 4.8％of the total carbon accumulation in aboveground new organs,respectively.The carbon accumulation of new flushes was mainly in the mid-summer flushes and the spring flushes.The research results provide a basis for evaluating the carbon se-questration capacity and carbon sinks of commercial macadamia forests.
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