摘要
本文研究了宁南山区主要树草种的热值和优良薪炭种的选择。结果表明:33个树种的平均热值为4485卡/克,最高为油松;5个草种的平均热值为4276卡/克,最高为黄花蒿;从热值来看,松科的最高,柽柳科的最低;针叶树大于阔叶树;乔木大于灌木;木本植物大于草本。树木的热值随年龄而变化。同时,还选出了适于该区发展的沙棘、刺槐、柠条等优良蒋炭灌木树种。
The average calorific value of 33 main tree species in the mountains of southern Ningxia is 4485 cal./g.Among them the Pinus ta- bulaeformis's is the highest(4737 cal./g.);the average calorific value of 5 herbaceous species is 4276 cal./g.Among them the Artemisia annua is the hig- hest(4457 eal./g.)The 33 tree species belong to 18 familins separately. The calorific value of Pinus family is the highest(4732 cal./g.)and that of Populus family is the lowest(4148 cal./g.).The calorific value of conifero- us tree is higher than that of broad-leaved one,arbor higher than bush,and woody plant higher than herb.The calorific value of tree species changes with the age,that provides the basis for rational management and utilization of fuelwood forest and selection of suitable to levelling stubble rotation.The calorific power produced in uaite period of time and unite area should be re- garded as main basis and index for choosing fine fuel species.According to this method the selected fine fuel shrubes suitable to development in this re- gion are Hippophae rhamnoides,Robinia pseudoacacia and Caragana microphylla.
出处
《陕西林业科技》
北大核心
1989年第3期21-24,14,共5页
Shaanxi Forest Science and Technology
