摘要
对福建省闽侯白沙国有林场湿地松叶片的灰分含量、干重热值、去灰分热值的季节变化进行了研究。结果表明：湿地松成熟叶、衰老叶的灰分含量的的季节变化趋势相同,湿地松成熟叶、衰老叶的灰分含量在秋冬季含量较高,而春夏季相对较低;湿地松成熟叶的灰分含量在1.26%-2.12%,平均为1.56%;衰老叶的灰分含量在1.46%-2.77%,平均为1.78%;衰老叶的灰分含量高于成熟叶（P〈0.05）;成熟叶的干重热值高于衰老叶（夏季除外）;成熟叶的干重热值在20.796-21.934 kJ/g,平均为21.154 kJ/g;衰老叶的干重热值在19.638-21.051 kJ/g,平均为20.448 kJ/g。成熟叶的干重热值与灰分含量相关性不显著（P〉0.05）,衰老叶的干重热值与灰分含量具有显著的线性负相关（P〈0.05）;湿地松成熟叶的去灰分热值为21.034-23.107 kJ/g,平均为22.054 kJ/g;衰老叶的去灰分热值在21.069-23.097 kJ/g,平均为21.999kJ/g;成熟叶的去灰分热值与衰老叶接近（P〉0.05）。
easonal changes in the ash contents,gross caloric values and ash free caloric values of the Pinus elliottii leaves were studied.The results showed as follows：mature and senescing leaves had the similar seasonal changes in the ash contents,with the higher ash contents in autumn and winter than spring and summer;senescing leaves had the higher ash contents（1.46%-2.77%）than mature leaves（1.26%-2.12%）（P0.05）;mature and senescing leaves had the similar seasonal changes in the gross caloric values,and the range of mature leaves（20.796-21.934kJ/g）was higher than those in senescing leaves（19.638-21.051kJ/g）;there was no significant correlation between gross caloric values and ash contents for mature leaves（P0.05）,and significant negative correlation for senescing leaves（P0.05）;mature and senescing leaves had the similar seasonal changes in the ash free caloric values,and the range of mature leaves（21.034-23.107 kJ/g）was close to senescing leaves（21.069-23.097 kJ/g）（P0.05）.
出处
《现代农业科技》
2010年第17期204-205,210,共3页
Modern Agricultural Science and Technology
关键词
湿地松
针叶
热值
季节动态
Pinus elliottii
leaf
caloric value
seasonal changes
