行距对老芒麦种群构件组成、生物量结构及能量分配的影响

试验对30,45,60,75,90 cm行距下,第3年盛花期老芒麦种群的根、茎、叶、花序等构件数量性状、生物量结构、能量累积及分配比例进行比较分析。结果表明,行距对单位面积分蘖数与生殖枝比例有极显著影响;对叶长、叶宽、单蘖叶片数均无显著影响;对单蘖节数、节间长有显著影响,致使自然高度间差异极显著;根系深度与分布范围、花序柄及小穗数显著受行距影响;叶、茎、花序、根系的生物量均显著受行距的影响,顺序为茎＞叶＞根系＞花序;行距对叶、茎、根、花序的单位生物量能量值均无显著影响;对叶、茎、根、花序的能量累积有显著影响,影响由大到小的顺序为茎＞叶＞花序＞根;行距极显著影响老芒麦能量在构件间的分配,影响由大到小为叶＞茎＞花序＞根。30 cm是适合饲草生产的最佳行距,60 cm是适合种子生产的最佳行距。

Effect of row space on population component composition,biomass structure and energy distribution of Elymus sibiricus

The root, stem, leaf and inflorescence of Elymus sibiricus cv. Chuancao No.2 population were determined at the flowering stage of the third year to elucidate the effect of row space on the quantitative trait of components, biomass structure, accumulation and distribution proportion of energy. There were highly significant differences in total tiller and the ratio of fertile to total tiller between different row spacings, and significant differences in eustipes length and number, and natural height of each tiller, but there was no significant difference in leaf length, width and number of tillers. Significant effects of row space were found on the depth and distribution range of root, length of sear stalk, ear number of fertile tillers, and the biomasses of leaf, stem, root, and inflorescence. The importance showed a descending order of stem> leave> root > inflorescence. No significant differences were found in energy value of single leaf, stem, root and inflorescence between row spaces, but significant differences were found in energy accumulations of leaf, stem, root and inflorescence in the order stem> leaf> inflorescence> root. There was a significant difference in energy distribution among row spaces: leaf > stem > inflorescence > root. The 30 cm row space is optimum for forage production, and 60 cm is the best for seed yield.