木荚红豆群落的能量现存量

Standing Crop of Energy in Ormosia xylocarpa Community

在生物量调查和热值测定的基础上 ,研究了三明莘口教学林场 34年生的木荚红豆群落的能量现存量。结果表明 :木荚红豆群落地上部分各组分的灰分含量、干重热值 (GCV)、去灰分热值 (AFCV)均以叶最高 ;地下部分的灰分含量、GCV、AFCV基本随根径的减小而增加。木荚红豆群落的灰分含量平均值乔木层 <灌木层 <草本层 ,而GCV、AFCV平均值乔木层 >灌木层 >草本层 ,其群落的能量现存量为 4839.2 0× 1 0 9J/hm2 ,其中地上部分为 41 70 .92× 1 0 9J/hm2 (占86.1 9% ) ,地下部分为 489.1 0× 1 0 9J/hm2 (占 1 0 .1 1 % ) ,群落的能量现存量 96.30 %分布在乔木层 。

Based on the measurement of biomass and the caloric values of plant samples,the standing crop of energy of a 34 year old Ormosia xylocarpa community,which is located in Sanming Xinkuo Tree Farm for teaching and research,was determined.Among the aboveground fractions ash contents and GCV and AFCV were the highest in the leaves of Ormosia xylocarpa .For the subterranean fractions,ash contents increased and GCV and AFCV decreased with the decrease of root diameter size.From tree layer,shrubs layer to herbs layer,the mean of ash content increased,while those of GCV and AFCV decreased.The standing crop of energy in Ormosia xylocarpa forest ecosystem was 4 839.20×10 9 J/hm 2,and that of the aboveground and subterranean fractions was 4 170.92×10 9 J/hm 2(86.19%)and 489.10×10 9 J/hm 2 (10.11%) respectively.96.30% of the standing crop of energy owed to tree layer.It accorded with the distribution of biomass of Ormosia xylocarpa community.