三点金和海滨雀稗种子成苗阶段吸水量及耐旱性

Water absorption and drought resistant of different growth seed of Desmodium triflorum(L) DC. and Paspalum L. salom seashore

分析三点金(Desmodium triflorum L.DC)和海滨雀种(Paspalum L.salom seashore)种子吸胀、萌动、发芽和幼苗4个阶段吸水量和耐旱性的关系。结果表明:三点金和海滨雀稗吸胀阶段种子吸水量分别为51％和43％;萌动种子吸水量相应为17％和19％;发芽阶段种子吸水量分别为32％和38％;萌动、发芽及幼苗出土阶段维持最低生长发育的土壤合水量不能低于5％,时间不能超过10d,否则,会引起大量缺苗。两种地被植物吸胀种子耐旱性类似于干种子,萌动种子是耐旱性升降的拐点,而发芽种子耐旱性最低,出苗阶段的耐旱性又渐回升。

Water absorption and drought resistant of different growth seed at four stages of swelling, germinating, seeding and seedling about Desmodium triflorum (L) DC. and Paspalum L. salom seashore were studied. The results showed that water absorption of these two turf plants at the seed swelling stage were 51% and 43%, were 17% and 19% at seed sprount stage, were 32% and 38% at germinating stage. The lowest soil moisture of maintaining germinating seed .seeding seed and seedling after seeding stand coming up were not less than 5%, and continuous drought day was not over 10 days. Otherwise, there was lack of seedling greatly. Drought resistant of swelling seed of two turf plants was as same as that of dry seed. Drought resistant of germinating seed was the bounds that being high or low of seedling drought resistant. Drought resister of seedling during bud seed came up highly.