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首页> 外文期刊>Australian Journal of Botany >Distribution and conservation status of the rare plants Melaleuca triumphalis and Stenostegia congesta (Myrtaceae), Victoria River district, northern Australia
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Distribution and conservation status of the rare plants Melaleuca triumphalis and Stenostegia congesta (Myrtaceae), Victoria River district, northern Australia

机译：澳大利亚北部维多利亚河地区的珍稀植物千层白千层和厚壁Stestestegia congesta（桃金娘科）的分布和保存状况

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摘要

Targeted searches of approximately 150 km of cliff lines for two rare sandstone shrubs, Melaleuca triumphalis Craven and Stenostegia congesta A. R. Bean, thought to be restricted to the Victoria River gorge system within Gregory National Park, increased the number of known populations from 3 and 6 to 31 and 37, respectively. Both species occur predominantly in rocky and often fire-protected niches on sandstone cliffs and scree slopes, and are frequently associated with permanent drip-lines and seepage areas. Although their broad habitat requirements are similar, the two species do occur in slightly different niches. The data presented here suggest that M. triumphalis is reasonably. re tolerant, whereas S. congesta appears to be more. re sensitive. Weeds and introduced animals are not thought to pose a threat to these rare species. Models developed using remotely sensed and landscape-scale data ( digital elevation models, radiometrics, geology and distance to rivers and streams) suggest that these species may also occur outside Gregory National Park in other areas of the Northern Territory such as on Bullo River and Bradshaw stations and in Keep River National Park. It is suggested that both species be regarded as Vulnerable under the IUCN guidelines.
机译：有针对性地搜索了大约150公里的悬崖线以寻找两种稀有的砂岩灌木，即千层白千层和Stenostegia congesta AR Bean（据认为仅限于格雷戈里国家公园内的维多利亚河峡谷系统），使已知种群从3和6增加到31和37。两种物种主要发生在岩石上，经常在砂岩峭壁和卵石坡面上有防火壁，并且经常与永久性滴水线和渗流区域有关。尽管它们的广泛栖息地要求相似，但这两种物种确实存在于略有不同的生态位中。此处提供的数据表明凯旋门氏菌是合理的。宽容，而S. congesta似乎更多。重新敏感。人们认为杂草和引入的动物不会对这些稀有物种构成威胁。使用遥感和景观数据开发的模型（数字高程模型，辐射测量，地质学以及与河流和溪流的距离）表明，这些物种也可能出现在北领地其他地区的格雷戈里国家公园之外，例如布洛河和布拉德肖站和Keep River国家公园。建议根据IUCN准则将这两个物种都视为易危物种。

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