毛竹叶片灰分含量及热值月动态变化规律研究

在福建省永春县,对毛竹(Phyllostachys pubescens)叶片的灰分含量、干重热值、去灰分热值月动态变化规律进行研究。结果表明:①毛竹成熟叶、老叶的灰分含量月变化趋势相似,毛竹成熟叶、老叶的灰分含量在秋季的10月至翌年春季的3月灰分含量较高,而春夏季相对较低;毛竹成熟叶的灰分含量在7.56%～15.91%之间,老叶的灰分含量在7.46%～16.67%,老叶的灰分含量显著高于成熟叶(P=0.0199)。②毛竹成熟叶、老叶的干重热值月变化趋势相似;成熟叶的干重热值在18.166～20.923 kJ.g-1之间,老叶的干重热值在18.581～20.249 kJ.g-1,老叶的干重热值与成熟叶接近;成熟叶的干重热值与灰分含量相关性不显著,老叶的干重热值与灰分含量具有显著的线性负相关。③毛竹成熟叶、老叶的去灰分热值月变化趋势相似;成熟叶的去灰分热值在20.061～22.962 kJ.g-1之间,平均为(21.670±0.720)kJ.g-1;老叶的去灰分热值在20.793～23.053 kJ.g-1之间,平均为(21.779±0.584)kJ.g-1;成熟叶的去灰分热值与老叶接近。

Monthly Changes of the Ash Contents and Caloric Values of Phyllostachys pubescens Leaves

Monthly changes of the ash contents,dry weight caloric values and ash free caloric values of the Phyllostachys pubescens leaves were studied in this paper.The results showed as follows:(1) mature and senescing leaves had the similar monthly changes in the ash contents,with the high ash contents from October 2002 to March 2003;senescing leaves had the higher ash contents(7.46%～16.67%) than mature leaves(7.56%～15.91%)(P=0.0199);(2) mature and senescing leaves had the similar monthly changes in the dry weight caloric values,the range of mature leaves(18.166～20.923 kJ·g-1) was close to senescing leaves(18.581～20.249 kJ·g-1),and the differences were not significant;there was no significant correlation between dry weight caloric values and ash contents for mature leaves,and significant linearity negative correlation for senescing leaves;(3) mature and senescing leaves had the similar monthly changes in the ash free caloric values,the range of mature leaves(20.061～22.962 kJ·g-1) with(21.670±0.720)kJ·g-1 in average was close to senescing leaves(20.793～23.053 kJ·g-1) with(21.779±0.584)kJ·g-1 in average,and the differences were not significant.