非洲沙漠三角洲壮美照片
据英国《卫报》网站报道,位于博茨瓦纳的奥卡万戈三角洲是世界上最大的内陆三角洲,也是非洲蔚为壮观的湿地生态系统。这里保持着大自然本来的风貌,由于水源充足,有大量野生动物在那里生活。最新出版的一本新书《奥卡万戈三角洲:洪水中的生命》栩栩如生地介绍了这里的迷人魅力,在书中作者将三角洲复杂的水系比作像人体一样的、不停变化的自然生命。以下是奥卡万戈三角洲壮美的照片,一定会令你向往这片神奇的土地。
母狮在水牛面前退却
一只母狮在一群大水牛的威逼下不得不退却。每年大约有10万人来到奥卡万戈三角洲旅游,为博茨瓦纳带来了不菲的收入。旅游收入是该国仅次于钻石业的第二大产业。不过,大量的游客也不可避免地带来了巨大压力,如何保持当地的可持续发展是一个严峻的课题。
为沙漠带来充沛的水源
奥卡万戈河奔流数千公里,将淡水和养料源源不断地输送到干旱的南部非洲。这条河流最终流入喀拉哈里沙漠盆地,并改变了这里的面貌。这张航拍照片还捕捉到沙漠中正在燃烧的几个着火点升起的烟雾。
野象数量激增带来威胁
奥卡万戈三角洲面临的威胁包括:非洲象数量激增、气候变化和野火。
河流源自安哥拉
奥卡万戈河,发源于安哥拉比耶高原,向东南经纳米比亚流入博茨瓦纳,最后消失于奥卡万戈三角洲。这条河流又名库邦戈(Cubango)河,是南部非洲一条内陆河。
九曲十八弯
奥卡万戈河形成了非常宽阔的河曲,以至于河水在河曲内作横向流动,缓缓流向下游。
形成大片沼泽地
奥卡万戈河最终流入沙漠盆地底部,导致这里洪水泛滥,形成了大片沼泽地。
给三角洲水系供水
上游的降雨给三角洲的“血管系统”带来或大或小的水源补充。大量的水也流进了沼泽地,最终被蒸发或渗透进地表下的沙土中。
鳄鱼和羚羊友好相处
在刚露出水面的一座河中小岛上,凶猛的鳄鱼和一群羚羊已经变成老朋友。在被部分淹没的旧河岸上,一簇簇树木起到了很好的维持生态系统平衡的作用,一方面它们可以吸收水中的盐分,另一方面为空气增加湿度。
夜间开花的睡莲
如图所示,这是夜间开花的睡莲。在漫长而缓慢的流动过程中,由于沙漠沙砾和芦苇的过滤作用,奥卡万戈河河水变得异常干净清澈。三角洲的大部分河水比瓶装水的水质都好。
当地人村落
这是在奥卡万戈三角洲的一个博茨瓦纳当地人村落。考古学家相信,早在10万年前,这里就已经有人类居住。人类的历史其实就是朝新的自然资源丰富之地迁徙的历史,或者逃离疾病、战乱、干旱或者洪水。
野象数量激增
另外一个问题是当地野象的数量不断增加。野象破坏了河边的树林,而河边的树林是这一三角洲的“生态之肺”,这引起了许多人的担忧。
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