Nassella trichotoma spikelet ST5 : 無料・フリー素材/写真
Nassella trichotoma spikelet ST5 / Macleay Grass Man
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Introduced, cool-season, perennial, dense, tussocky C3 grass to 60 cm tall and with short soft hairs on nodes. Leaves are bright green, very fine and rough to the touch; erect when young, but drooping in larger plants. Ligules are short, white membranes 0.5–2.5 mm long. Flowerheads are open panicles to 25 cm long; they break off at maturity and blow along. Spikelets are 1-flowered and have 2 purplish glumes. Lemmas are 1.5-2 mm long and about as broad, with a nearly straight 2-3.5 cm long awn attached off-centre. Flowers in spring. A native of South America, it is mostly found on light soils in areas of disturbance (e.g. roadsides and overgrazed pastures), low productivity and/or ground cover. A Weed of National Significance, it readily invades any sort of grassy vegetation. Extremely poor feed value; animals forced to graze it may eventually starve to death. Plants and seed banks are long lived, but seedlings are susceptible to competition. Managed with a combination of methods: competitive pastures; windbreaks; minimising soil disturbance; machinery, fodder and livestock hygiene; cropping; physical removal; and registered herbicides. |
| 撮影日 | 2012-06-14 15:02:08 |
| 撮影者 | Macleay Grass Man , Dungog, Australia |
| タグ | |
| 撮影地 | Oolong, New South Wales, Australia 地図 |
| カメラ | E5400 , NIKON |
| 露出 | 0.007 sec (1/153) |
| 開放F値 | f/7.9 |