东南滨海沙地主要造林树种的生物量与能量

应用GR-3500型氧弹式热值仪测定了福建省东山县赤山林场木麻黄林、厚荚相思林和湿地松林的能量现存量,结果表明:木麻黄林现存生物量为156.82 t/hm2,各组分热值(总能量与总生物量的比值)处于19.84～21.70 kJ/g,整个林分平均热值为20.26 kJ/g,能量现存量为3 177.95 GJ/hm2,干的能量最大占总量38.09%,果的能量最小占总量0.77%;厚荚相思林现存生物量为149.51 t/hm2,各组分干重热值为19.98～23.48 kJ/g,整个林分平均热值为20.59 kJ/g,能量现存量3 079.16 GJ/hm2,干的能量最大占总量57.67%,果的能量最小占总量3.06%;湿地松林现存生物量142.22 t/hm2,各组分干重热值处于20.53～21.54 kJ/g,整个林分平均热值为21.00 kJ/g,能量现存量为2 986.28 GJ/hm2,其中干的能量最大占总量35.08%,枯枝的最小.3树种林分具有较高的现存生物量、能量现存量、各组分热值和整体平均热值,体现出较高的太阳能利用率.可见从热值与生物量的角度看,木麻黄、厚荚相思和湿地松是海岸沙地造林的良好树种.

Study on Biomass and Energy of Main Species Plantation on the Coast Sandy in the South East of China

By burning samples in a GR-3500 Oxygen Bomb Calorimeter,the caloric values of plant samples were tested and then calculated the total amounts of energy of Casuarina equisetifolia plantation,Pinus elliottii plantation and Acasia crassicarpa plantation at Chishan forestry centre in Dong shan county Fujian province.The results were showed as follows: The standing biomass and energy were 156.82 t/hm2 and 3 177.95 GJ/hm2 in C.equisetifolia plantation,and the gross caloric values were between 19.84 kJ/g and 21.70 kJ/g,with total average 20.26 kJ/g(The ratio of total energy to total biomass).The energy distribution among components were: trunk occupied 38.09% of total,the largest ratio of components,while fruit on the other hand,was 0.77%;While in the A.crassicarpa plant,the standing biomass and energy were 149.51 t/hm2 and 3 079.16 GJ/hm2,respectively.The caloric were from 19.98 kJ/g to 23.48 kJ/g with total average 20.59 kJ/g.The components energy structure were as follows: Truck occupied 57.67% of total,while dead branch only 3.06% in the other side.In the P.elliottii plantation,standing biomass was 142.22 t/hm2.Caloricvalue of components range from 20.53 kJ/g to 21.54 kJ/g,with total average 21.00 kJ/g.While standing energy was 2 986.28 GJ/hm2.From all the above,three species of plantation with higher standing biomass,standing energy,high caloric values of components and total average values,showed that they had higher ratio of solar energy utilization.So C.equisetifolia,A.crassicarpa and P.elliottii were very suitable species to coastal sandy cultivation.