五种丛生状棕榈植物叶热值的月变化研究

对5种丛生状棕榈植物一欧洲棕、细叶棕竹、小箬棕、玲珑椰子、缨络椰子的叶片热值和灰分含量的月变化进行了研究，结果表明，5种植物具有较高的灰分含量，但灰分含量的月变化趋势各不相同；欧洲棕、细叶棕竹、小箬棕3种植物干重热值的月变化趋势有些差异，同属的缨络椰子、玲珑椰子干重热值的月变化趋势基本相似；缨络椰子、小箬棕的干重热值与灰分含量具有显著的线性相关(P<0．05)，而其余3种植物的干重热值与灰分含量相关性不显著(P>0．05)；从去灰分热值的月变化来看，细叶棕竹与小箬棕，缨络椰子与玲珑椰子的月变化趋势相似。

Monthly changes in caloric values of five shrubby Palmae species leaves

Studies on the monthly changes in the ash contents and caloric values of 5 shrubby Palmae species (Chamaerops humilis, Rhapis gracilis, Sabal minor, Chamaedorea cataractarum, Chamaedorea brachypoda) leaves showed that annual average ash content of the five shrubby species was 4.87% +/- 1.37% for Chamaerops humilis, 8.33% +/- 0.89% for Rhapis gracilis, 7.85% +/- 2.64% for Sabal minor, 9.20% +/- 1.35% for Chamaedorea cataractarum, and 12.42% +/- 1.78% for Chamaedorea brachypoda. The monthly changes of gross caloric value were different for Chamaerops humilis, Rhapis gracilis and Sabal minor, but similar to each other for Chamaedorea cataractarum and Chamaedorea brachypoda, and the annual average gross caloric value of the five shrubby species was 20.50 +/- 0.32 kJ x g(-1) for Chamaerops humilis, 20.04 +/- 0.50 kJ x g(-1) for Rhapis gracilis, 20.21 +/- 0.68 kJ x g(-1) for Sabal minor, 20.52 +/- 0.48 kJ x g(-1) for Chamaedorea cataractarum and 18.90 +/- 0.47 kJ x g(-1) for Chamaedorea brachypoda. The gross caloric values were correlated remarkably with ash contents for Chamaedorea cataractarum and Sabal minor (P < 0.05), but there was no significant correlation between gross caloric values and ash contents for other three species (P > 0.05). Rhapis gracilis and Sabal minor, and Chamaedorea cataractarum and Chamaedorea brachypoda had similar monthly changes in ash free caloric values, respectively. The average ash free caloric value of the five shrubby species was 21.55 +/- 0.53 kJ x g(-1) for Chamaerops humilis, 21.87 +/- 0.46 kJ x g(-1) for Rhapis gracilis, 21.84 +/- 0.53 kJ x g(-1) for Sabal minor, 22.60 +/- 0.81 kJ x g(-1) for Chamaedorea cataractarum, and 21.59 +/- 0.63 kJ x g(-1) for Chamaedorea brachypoda. Chamaedorea cataractarum had a higher ash free caloric value than other four species (P < 0.05), and the ash free caloric values of Chamaerops humilis, Rhapis gracilis, Sabal minor and Chamaedorea brachypoda were similar, the differences being not significant by t test (P > 0.05).