高梁──苏丹草杂交种干物质积累分配及光合性能的研究

研究表量，高粱—苏丹草杂交种的单株生物量高，其干物质积累量高于甜高粱杂交种和粒用高粱杂交种．各器官的干物质积累量以分蘖茎为最高．并且增长迅速．主茎和分蘖茎的干物质分配率在生育后期无负值．高粱—苏丹草杂交种获得较高生物量的原因是分蘖性强，致使产生较高的ＬＡＩ和ＣＧＲ．

A Study on Dry Matter Accumulating Distribution and Photosynthetic

THe study through dry matter accmulatiug distribution and photosynthetic per formance for Sorghum and Sudan grass during post-growing period showed that biomass ofindividual plant between Sorghum and sudan grass hybrid species was higher,and amount ofit's dry matter accumulation was higher than sweet Sorghum hybrid species. BecauseSorghum-Sudan grass hybrid species is tillering crop,compared to amount of dry matter ac cumulation in all organs,that of tillering stems was the highest and increasing rapidly.Dis tribution rates of dry matter in main stems and tillering stems had not negative value duringpost-growing period.The reason that Sorghum-Sudan grass hybrid species has higherbiomass is stronger tilling function,resulting in higher LAI and community growth rate(CAR)