菊芋物质分配格局对密度制约的响应

通过测定不同密度条件下菊芋（Helianthus tuberosus）株高、产量和各器官生物量等指标，探讨密度对其株高、产量和生物量分配比例的影响规律。结果表明：茎秆、块茎及地上生物量随着密度增加而增加，小花、根系和叶片的生物量均随密度增加表现为先升高后降低，密度为0.6 m×0.6 m时达最高；单株根系生物量随密度增加表现为先增加后降低，单株叶片、小花、茎秆、块茎和总生物量均随密度增加逐渐降低；单株生物量贡献率顺序为茎秆>叶片>块茎>小花>根系，且与密度无关；株高随密度的增加而增加。因此，以饲用为目的宜高度密度种植，以块茎产品为目的种植密度宜为0.6 m×0.6 m。

Effects of Density on the Height,Yield and Allocation Pattern of Helianthus tuberosus L.

The effects of density on the height, yield and allocation pattern of Helianthus tuberosus were discussed by measuring the height, yield and biomass of H. tuberosus at different densities to provide theoretical guidance for the cultivation and management of H. tuberosus. The results showed that the yields of stem, tuber and aboveground all increased with the increase of density, and flower, root and leaf biomasses increased at first and then decreased. The all tested values of H. tuberosus reached the maximum under the density of 0.6 m×0.6 m. For single plant, the root biomass increased at first and then decreased with the increase of density, and leaf, flower, stem, tuber and total biomasses all decreased with the increase of density. The contribution rate of individual plant was ordered as stem>leaf>tuber>flower>root, and was not affected by density; The height of H. tuberosus increased with the increase of density. Therefore, the high density should be used for feed production, and the density of 0.6 m×0.6 m should be used for obtaining more tubers.