杉木观光木混交林凋落物热值及灰分含量的季节动态分析

通过对福建三明 2 7年生杉木观光木混交林和杉木纯林凋落物的热值、灰分含量及其季节动态的分析表明 ,混交林中杉木凋落物各组分的干重热值介于 2 0 6 37～ 2 1 96 0kJ·g-1之间 ,观光木凋落物各组分干重热值介于 19 6 35～ 2 0 0 5 8kJ·g-1之间 ,杉木纯林凋落物各组分的干重热值介于 2 0 70 5～ 2 1 90 8kJ·g-1之间 ,各树种凋落物均以叶、花的热值较高 ,而果、枝的热值较低。观光木凋落物各组分的灰分含量高于杉木。杉木落叶灰分含量季节间变化均较小 ;而观光木落叶灰分含量的变化模式为 :夏季 >秋季 >春季 >冬季。杉木落叶干重热值和去灰分热值季节变化模式均为 :冬季 >秋季 >春季 >夏季 ,而观光木落叶则均为 :冬季 >夏季 >秋季 >春季

The Seasonal Dynamic Analyses of Heat Values and Ash Contents of Cunninghamia lanceolata and Tsoongiodendron odorum Mixed Forest Litter

The analyses show that the dry weight heat values of various litter constituents of Cunninghamia lanceolata in mixed forests are 20.637～21.960 kJ/g,those of Tsoongiodendron odorum are 19.635～20.058 kJ/g,and those of C.lanceolata pure forests are 20.705～21.908kJ/g.The heat values of leaves and flowers are relatively high in those of all various tree species litter and those of fruits and branches relatively low.The ash contents of various litter constituents of T.odorum are higher than those of C.lanceolata.The C.lanceolatafallen leaf ash content changes in seasons are all small; whereas the change pattern of T.odorum fallen leaf ash content is :summer>autumn>spring>winter.The seasonal change patterns of fallen leaf dry weight and ash remove heat values of C.lanceolata are all:winter>autumn>spring>summer,whereas those ofT.odorum are all:winter>summer>autumn>spring.