| 词条 | Posidonia australis |
| 释义 |
| status = NT | status_system = IUCN3.1 | status_ref = [1] | genus = Posidonia | species = australis | authority = Hook.f. }} Posidonia australis is a species of seagrass that occurs in the southern waters of Australia. It is sometimes referred to as fibreball weed. The marine plant forms large meadows that are considered to be of high importance to the environmental conservation of the region. Balls of decomposing detritus from the foliage of the plant are found along nearby shore-lines. DescriptionA flowering plant occurring in dense meadows, or along channels, in white sand. It is found at depths from 1 metre to 15 metres. Subsurface rhizomes and roots provide stability in the sands it occupies, erect rhizomes and leaves reduce the accumulation of silt. The leaves are ribbon-like and between 11 and 20 mm wide. They are bright green, perhaps becoming browned with age.[2] The terminus of the leaf is rounded or absent through damage. They arranged in groups with older leaves on the outside, longer and differing in form from the younger leaves they surround. The species is monoecious. The flowers appear on small spikes on leafless stems, two bracts are found on each spike. The plant pollinates by hydrophily, by dispersing in the water.[3] The reproduction of P. australis occurs usually through sexual or asexual methods but, under extreme conditions, by pseudovivipary method.[4] Recent research has shown that Posidonia australis can sequester carbon 35 times more efficiently than rainforests.[5] |