能源植物斑茅在不同生长时期的产量与组分变化

Variation of Yield and Composition of Energy Plant Erianthus arundinaceum During Different Growth Stages

研究不同时期斑茅产量及其化学组分的变化。结果表明:斑茅生物质产量在11月达到最高,其后开始下降;整个生长发育过程中茎叶生物质产量比呈现上升趋势;含水量随生长发育的进行显著降低;叶片灰分含量全年最低为5月,从10月份开始显著增加,至12月份达到最高。茎秆灰分含量略低于叶片,全年最低为10月,最高为7月,变化幅度不大。叶片中木质素含量全年由高到低排列顺序为12月>11月>9月>10月>7月>8月>6月;茎秆中木质素含量全年由高到低排列顺序为12月>11月>9月>7月>8月>10月>6月。10月份茎秆含水量低,灰分含量最低,热值较高,结合产量和燃料品质考虑其更适于直接燃烧,而9月份叶片则更加适于作为生物转化的材料。

The effect of harvesting time on the yield and chemical composition of E.arundinaceum was studied.The results revealed that the highest biomass yield was available in November,and then the proportion of leaf biomass was gradually started to decline.The water content decreased significantly while the quantity of ash in leaves remained the lowest in May,which increased significantly in October and reached the highest amount in December.The quantity of ash in the stem was slightly lower than that in the leaf with little change year around.The maximum was appeared in July and the minimum was observed in October.The lignin content in the leaf was in the following downward order：Dec.,Nov.,Sept.,Oct.,July,Aug.,June,and that for the stem was：Dec.,Nov.,Sept.,July.,Aug.,Oct.,June.The calorific value of the leaf was the lowest in September and the highest in October,whereas that for the stem was the highest in August.The study showed that the best biomass accumulation was usually available with the lowest moisture and ash in October,which was more suitable for the production of fuel.The results proved that the lignin content of the leaf was lower than that of stem,which may be more suitable for bioconversion.