根茎类禾草发育特性的研究

Studies on the Development Characteristic of Rhizomatous Grasses

本项研究结果表明 ,根茎类禾草的生育期普遍较长。一般情况是长根茎禾草的有性生殖期相对较短 ,而其无性生殖期相对较长 ;短根茎禾草则相反。不同根茎类型的禾草在生长发育过程中地上部和地下部的发育动态有不同的变化规律。地上部重量差异表现为短根茎 >中根茎 >长根茎 ,三者在地上部生长均呈现单峰曲线 ;地下部根系重表现为长根茎 >中根茎 >短根茎 ;根冠比的变化趋势三者均呈现由高—低 -高的“U”型曲线 ,根冠比大小表现为长根茎>中根茎 >短根茎。根茎类禾草中根茎的发育程度与种子的休眠程度有明显的关系 ,根茎越发达 ,其无性繁殖能力越强 。

The result of the research showed that the regeneration periods of the rhizomatous trasses usually were longer than other grass species.The sexual reproduction periods were shorter than vegetative reproduction periods in long-rhizome types,but the situations were opposite in short-rhizome types.The development dynamics of above and under ground parts of plants showed different among the three rhizomatous types.The biomasses of above ground in the three types appeared as follow:short-rhizome type>mid-rhizo...