豫西刺槐能源林的热值动态

对豫西丘陵区5个无性系刺槐苗期的不同器官的干重热值、去灰分热值和灰分含量及生长量和生物量进行了测定。结果表明:5个无性系刺槐苗期的生长节律不同和各器官的积累速度不同,最后一季干物质量排序为3-I＞83002＞84023＞8044＞8048;5个无性系刺槐苗期的各器官中干重热值和去灰分热值的排序存在差异,8044的叶和枝的干重热值和去灰分热值平均最大,分别为19.31、21.18 kJ/g和18.00、19.39 kJ/g,8048干的干重热值和83002干的去灰分热值平均最大,分别为18.72、19.12 kJ/g,83002皮的干重热值和去灰分热值平均最大,分别为17.77、19.29 kJ/g。整体上标准木单位质量的干重热值表现为先升后降,83002、3-I、84023的生长潜能大,单位面积上的热值表现为无性系83002、3-I、84023最大。

Dynamics of caloric value of Robinia pseudoacacia L. energy forest in the west of Henan Province

With the shortage of available fossile resources, the development and utilization of renewable energy sources has become significantly important. Energy is one of the basic concept of ecological functions. Plant caloric value,one of the most important characteristics of a fuel, can reflect the solar radiation energy utilization in plant and also be also be used as plant growth status of an effective index. Plant caloric value is termed as heat emitted by plant dry matter after completely combusting which reflects the capability of solar energy conversion in plants. So that caloric value is an effective index of plants energy production. Gross caloric values, ash free caloric values and ash contents as well as growth quantity and biomass of five clones of Robinia pseudoacacia seedling stage and organs in hilly areas of the West of Henan Province were determined using calorimeter and muffle furnace. The results showed as follows: all of the five clones have the different growth rhythm and different accumulation rate in different organs, and dry weight in the last season decreased in the order of 3-I, 83002, 84023, 8044 and 8048.The decreased order in different organs of gross caloric values and ash free caloric values of five clones were different. The 8044 clone had the largest average gross caloric values and average ash free caloric values of leaves and branches, which were 19.31, 21.18 kJ/g and 18.00, 19.39 kJ/g respectively. The largest average gross caloric values of trunk and average ash free caloric values of trunk were from 8048 and 83002, which were 18.72 kJ/g and 19.12 kJ/g respectively. Both average gross caloric values and average ash free caloric values of barks of 83002 were the largest, which were 17.77 kJ/g and 19.29 kJ/g, respectively. In brief, the gross caloric values of unit mass of standard wood went up first of all and then decreased. The caloric values of 83002, 3-I and 84023 in unit area were the largest.