30个桉树无性系人工林碳储量分析

Carbon Storage Analysis of 30 Eucalyptus Clonal Plantation

通过对国营雷州林业局30个5年生桉树无性系人工林的调查、试验,旨在阐明不同桉树无性系人工林碳储量的变化规律及营建桉树碳汇林的合理措施。结果表明:30个桉树无性系人工林生态系统平均碳储量为148.743 t·hm-2,高于之前学者研究的桉树人工林碳储量,其中,乔木层和土壤层分别占34.39%、61.88%;乔木层平均碳储量达51.948 t·hm-2,不同无性系间差异极显著(p<0.01),其中,23(101-1)、25(179-1)、4(BU1)、26(184-1)号无性系表现最优;土壤层的平均碳储量为92.033 t·hm-2,不同无性系土壤层碳储量差异不明显;灌木层、草本层、凋落物层碳储量分别是2.430、0.731、1.592 t·hm-2,占比例较小。营建桉树碳汇林关键在于无性系的正确选择。

30 five-year-old Eucalyptus clonal plantations belonging to Leizhou Forestry Bureau were investigated and studied to determine the variation of carbon storage of different Eucalyptus Clones and the reasonable measures of es- tablishing Eucalyptus carbon sequestration forest. The results of the study showed ： the average carbon storage of the 30 clones was 148. 743 t ·hm-2, which was higher than that of the Eucalyptus clonal plantation studied in the past. The carbon storage of tree layer and soil layer accounted for 34.39% and 61.88% of carbon storage of the whole e- cosystem; the carbon storage of tree layer was 51. 948 t · hm-2, and significant differences were found （p 〈0. 01 ） bon storage of shrub layer, herb layer and forest floor layer were 2. 430 t· hm-2, O. 731 t· hm-2and 1. 592 t · hm -2, accounting for small. It is concluded that the key of establishing Eucalyptus carbon sequestration forest is se- lecting the proper clones.