Response of Germination and Seeding Growth of Suaeda salsa Seeds from Tidal Marshes in the Yellow River Estuary to N/P Ratio of Soil
The response of germination and seedling growth of Suaeda salsa seeds from the middle and low tidal marshes in the Yellow River estuary to N/P ratio of soil were investigated from October to November in 2010 under the controlling conditions in an artificial climate chest.The results showed that both the germination rates of the seeds from middle and low marshes decreased greatly with increasing salinity.Under N/P ratio was 9.5 and salinity stresses was low (0 mM and 300 mM),the middle concentration of N and P supplement (4.524 mM nitrogen+0.476 mM phosphorus) was favorable for germination and seedling growth of seeds from the middle tidal marshes,while the low concentration of N and P supplement (0.905 mM nitrogen+0.095 mM phosphorus) was beneficial to those from the low tidal marshes.Under high salinity stress (600 mM),the germination and seedling growth of the seeds from the middle and low tidal marshes were greatly stimulated by high concentration of N and P supplement (9.05 mM nitrogen+0.95 mM phosphorus).As N/P ratio reached 17,high concentration of N and P supplement (9.444 mM nitrogen+0.556 mM phosphorus) showed great promotion to the germination and seedling growth of the seeds from the middle and low tidal marshes regardless of high or low salinity stresses,indicating that the proportion of high N concentration and low P concentration (N/P ratio was 17) could effectively alleviate the harm for germination of the seeds caused by salinity stress.It was feasible to adopt the index of average growth production to describe the germination and seedling growth of the seeds as affected by external factors since it could truly recover the general status of germination and seeding growth of the seeds.Presently,accompanying with the variations of N and P proportions in the tidal marshes of the Yellow River estuary,the resistance of the seeds from the middle and low tidal marshes to salinity stresses (particularly for those from the middle tidal marshes) would show an increasing tendency,indicating that the adaptation capacity for high salinity stress could be promoted by controlling the N/P ratios which could be effectively applied for the restoration of regional marshes.
seed germinationsalinity stressN/P ratioSuaeda salsaYellow River estuary
NETL
NSTL
万方数据
维普
