论文部分内容阅读
2002年11月至2003年10月在福建沿海中部惠安县崇武镇赤湖林场用收集筐法收集木麻黄凋落物,分析了凋落物各组分的归还量;应用GR-3500型氧弹式热值仪测定木麻黄凋落物的热值,并测定分析了凋落物各组分的灰分含量。结果表明:木麻黄人工林的凋落物归还量为14.18 t.hm-2.a-1,其中小枝占72.21%,枝条占23.41%,球果占2.68%,其余部分占1.69%。归还分布情况是:4—9月为归还高峰期,占总归还量的68.48%,其它月份占总归还量的31.52%。凋落物各组分灰分含量平均值顺序为:花(5.32%)>小枝(4.90%)>枝(4.69%)>球果(3.20%);凋落物干物质热值平均值顺序为:小枝>(21.11 kJ.g-1)>花(20.96 kJ.g-1)>球果(19.91 kJ.g-1)>枝条(19.89 kJ.g-1);凋落物去灰分热值的顺序为:小枝(22.19 kJ.g-1)>花(22.18 kJ.g-1)>枝条(20.87 kJ.g-1)>球果(20.63 kJ.g-1)。整个林分的能量归还量为294.55 G J.hm-2.a-1,其中小枝占主体,归还量为215.79 G J.hm-2.a-1,其次是枝条66.07 G J.hm-2.a-1,再次是果7.66 G J.hm-2.a-1,花最小5.02 G J.hm-2.a-1,各月的能流变化与凋落物生物量相似。
From November 2002 to October 2003, the litter of Casuarina equisetifolia was collected by collecting baskets method in Chifu Forest Farm, Chongwu Town, Huian County, in the coastal area of Fujian. The amount of return of litter was analyzed. Calorific value of Casuarina equisetifolia was determined by calorimeter, and the ash content of litter components was determined. The results showed that litterfall returned 14.18 t.hm-2.a-1, accounting for 72.21% of branchlets, 23.41% of shoots, 2.68% of cones, and the rest 1.69%. Return distribution is: April-September is the peak return period, accounting for 68.48% of the total restatement, other months accounted for 31.52% of the total restatement. The order of the ash content of litter was as follows: flower (5.32%)> twig (4.90%)> branch (4.69%)> cone (3.20% (21.11 kJ.g-1)> flower (20.96 kJ.g-1)> cones (19.91 kJ.g-1)> shoots (19.89 kJ.g-1) Branchlets (22.19 kJ.g-1)> flowers (22.18 kJ.g-1)> shoots (20.87 kJ.g-1)> cones (20.63 kJ.g-1). The amount of energy returned to the whole forest was 294.55 G J.hm-2.a-1, of which branchlets accounted for 215.79 G J.hm-2.a-1, followed by 66.07 G J.hm-2 .a-1, and again the fruit 7.66 G J.hm-2.a-1 with the minimum flower of 5.02 G J.hm-2.a-1. The monthly energy flux changes are similar to litter biomass.