在福建省惠安县赤湖林场用根钻法和分解袋法对18年生木麻黄人工林细根生物量、分解及周转进行了研究。结果表明,18年生木麻黄活细根生物量平均为6.693 t.hm-2,死细根平均为2.292 t.hm-2,细根生物量具有明显的季节动态,活细根和死细根生物量年变化均为双峰型,活细根生物量峰值出现在1月和7月,死细根出现在3月和7月。用试验期间不同时间数据拟合得到木麻黄细根分解回归方程:x/x0=1.06e-0.0014t。应用模拟方程计算出木麻黄分解1年的干重损失率理论值(35.96%)与实测值(38.19%)较为接近。木麻黄细根半分解时间为537 d,95%分解时间为2 181 d。结合木麻黄人工林在不同季节的细根生物现存量,18年林龄木麻黄细根年死亡量分别为1.825 t.hm-2,年生长量为3.173 t.hm-2,年周转0.474次。The sequential root coring and litter bag technique were used to study fine root biomass,decomposition and turnover in an 18-year-old Casuarina equisetifolia plantation,from Chihu Forestry Farm of Hui'an County.Results show that the average live fine root biomass is 6.693 t·hm-2 and that of dead fine root is 2.292 t·hm-2.Annual dynamic curves of both live and dead fine roots have double apices.Curve peaks of live fine root biomass occur in Jan.and July,while that for dead fine root occur in March and July.The regression equation,based on dry matter decomposition data gained during different experimental periods is:x/x0=1.06e-0.0014t.Theoretic annual dry-weight loss rate of 35.96% calculated from the equation is close to the metrical value of 38.19%.It takes 537 days and 2 181 days to respectively decompose 50% and 95% of the fine roots.Annual mortality of fine roots in the 18-year-old plantation is 1.825 t·hm-2 and annual productivity is 3.173 t·hm-2,with an annual turnover rate of 0.474.国家“十一五”科技支撑计划项目(2006BAB03A14-01);; 福建省科技重大项目(2006NZ0001-2);; 国家林业局南方山地用材林培育重点实验室项目资
