7种能源草在酸性红壤中的性状比较及适应性评价

本研究比较了7种能源草在酸性红壤中物候期、越冬率、农艺性状和化学成分等20个性状,并利用其中与适应性相关的12个性状来综合评价不同能源草在酸性红壤中的适应性。结果表明,1)7种能源草中除狼尾草以外其余各品种均能完成生育期,且都能在酸性红壤上生长良好;2)7种能源草的7个主要农艺性状和5个化学成分均有显著差异(P0.05)。其中五节芒、湘杂芒、柳枝稷的干物质产量较高,单株分别达到5385.24,4846.09和4566.83g,而斑茅、奇岗和湘杂芒的纤维素含量较高,分别达46.13%,45.38%和45.16%;3)对12个数量性状进行主成分分析,得到累计贡献率为92.626%的4个主成分因子,说明前4个主成分代表了主要的遗传信息;4)利用主成分线性模型综合评价7种能源草的适应性,排序结果如下:湘杂芒五节芒狼尾草斑茅柳枝稷奇岗荻。本研究结果可为我国南方酸性红壤边际性土地的开发与利用提供理论依据。

Evaluation of the adaptability of bioenergy grasses in acidic red soil

Seven grass species grown as bioenergy crops were compared using 20 traits including phenological period,winter survival rate,agronomic traits and chemical composition.The results showed that,with the ex-ception of Pennisetum purpureum ,all grasses could complete their growth period and grow well in acidic red soil.There were significant differences among the grasses for seven agronomic characters and five chemical composition traits.Miscanthus floridulus ,M.lutarioriparia×sinensis and Panicum virgatum had higher dry matter yield than other species;5385.24,4846.09 and 4566.83 g respectively.Cellulose contents of Saccha-rum arundinaceu ,Miscanthus × giganteus and M.lutarioriparia × sinensis were 46.13%,45.38% and 45.16% respectively,significantly higher than other species.Principal component analysis of twelve quantita-tive traits revealed that the cumulative contribution rate of four principal component factors accounted for was 92.626% of variation.This indicated that M.lutarioriparia×sinensis was the most adaptable species followed by M.floridulus ,P .purpureum,S .arundinaceum,P .virgatum,Miscanthus ×giganteus and M.sacchari-flora.The results of this study will provide a theoretical basis for the development and utilization of acidic red soil in southern China.