不同发育阶段木麻黄枝条碳素含量差异性研究

o determine the adaptive strategy of carbon density of Casuarina equisetifolia.L to different development phases, we set up 4 20×20m plots to survey the basic indices such as DBH, height, under branch height, crown breath, deviation angle of stem, etc. and determine the carbon content of typical samples in Casuarina equisetifolia.L protection forest in Dahe state-owned forest farm, Changle county, Fujian Province. The results showed as follows: 1) the carbon content of branch converge in seedling phase was lower significantly than another two besides the other branch levels. Moreover, the carbon content of new branchs in sapling and mature phases was significantly lower than that of one-year, two-year and multiple-year branch and branch converge. Meanwhile, the carbon content of one-year and two-year branchs was significantly lower than that of multiple-year branch and branch converge. 2) the carbon content of different branch parts showed similar trend: that of pressure point in one-year branch was higher than that of non-pressure point. Instead, that of pressure and non-pressure point in two-year and multiple-year branch didn't vary significantly. 3) In sapling phase, the carbon content of the first and second order branch didn't vary significantly except the third order branch. Unlike sapling phase, in mature phase, the carbon content of the second and third order branch didn't vary significantly except the first order branch. Therefore, the carbon content of the first and second order branch both in sapling and mature phase, was higher than that in seedling phase. The differences in carbon content of branch suggest that Casuarina equisetifolia.L has different adaptive strategy during different development phases.