【摘要】 采用空间代时间的方法，对福建三明市不同发育阶段（幼龄林、成龄林及过熟林）杉木人工林各季节不同凋落物组分的热值进行了测定，分析了不同发育阶段杉木人工林凋落物的能量输入特征。结果表明：不同发育阶段杉木林各凋落物组分的灰分含量、干重热值及去灰分热值差异显著（P<0.05），分别介于3.51%～8.59%、18.14～21.19 kJ/g和18.80～22.55 kJ/g；不同发育阶段杉木林各凋落物组分的年能量输入量季节性差异明显，其中在春季和夏季较高，在秋季和冬季较低；不同凋落物组分的年能量输入量差异显著（P<0.05），其中，凋落叶和其他组分的年能量输入量占总量的比例较大，分别占30.91%～52.67%和25.90%～49.62%；杉木具有较高的太阳能转化效率，每年以凋落物形式输入林地的能量随杉木发育阶段的推进而明显增加，表现为过熟林[10755.75 kJ/(m~2·a)]>成龄林[7924.80 kJ/(m~2·a)]>幼龄林[6987.45 kJ/(m~2·a)]。更多还原

【Abstract】 The concept of space was adopted as a substitute for time.The calorific values of litter components of Cunninghamia lanceolata plantations in Sanming City,Fujian province at different developmental stages (young,mature and over-mature stage) were measured,and the energy input characteristics of litter components at different developmental stages were analyzed.The results showed that the ash content,gross caloric value (GCV) and ash-free caloric value (AFCV) of different litter components at different developmental stages were significantly different (P<0.05),with the range of 3.51%～8.59%,18.14～21.19 kJ/g and 18.80～22.55 kJ/g respectively.The annual energy input of litter components of Cunninghamia lanceolata at different developmental stages had obvious seasonal differences,with higher energy input in spring and summer,and lower energy input in autumn and winter.The annual energy input of different litter components was significantly different (P<0.05),among which litter leaves and other components with the large percentage accounted for 30.91%～52.67%and 25.90%～49.62%,respectively.The solar energy conversion efficiency of Cunninghamia lanceolata was higher.Annual energy input by litter increased with the increase of developmental stages,which was in the order of over-mature stage[10755.75 kJ/(m~2·a)]>mature stage[7924.80 kJ/(m~2·a)]>young stage[6987.45 kJ/(m~2·a)].更多还原