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Seed germination of tangled lignum (Duma florulenta) and nitre goosefoot (Chenopodium nitrariaceum) under experimental hydrological regimes
The distribution of plants on floodplains depends on the hydrological regime on the floodplain, and the hydrological requirements of the plants. The goals of this study were to determine: (i) the relationships between germination of tangled lignum (Duma florulenta) and nitre goosefoot (Chenopodium nitrariaceum) and hydrological regime, (ii) the buoyancy of the seeds of the two species, and hence their ability to disperse via water, and (iii) to inform environmental flow requirements for the two species. Seeds of tangled lignum germinated best on soaked soil and on soil inundated for 20 days. Seeds of nitre goosefoot germinated best on soil inundated for five days and on soaked soil. The majority of tangled lignum seeds floated for at least seven days. The majority of nitre goosefoot seeds sank within seven days. The results of the study are consistent with the observed distributions of the species on floodplains. Tangled lignum requires about 20 days of flooding, and wet soils following flood recession for optimal germination. Nitre goosefoot requires a few days of flooding, and wet soils following flood recession for optimal germination. The inundation requirements for germination of tangled lignum and nitre goosefoot should be considered in the management of environmental flows.
MF17357 Accepted 20 January 2018
© CSIRO 2018