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首先,在遥远未来,人类应该会具备具备彻底改造沙漠这个能力的,比如可能会通过改变地球气候、甚至改变地球地理构造的方式来实现。注意是“具备改造的能力“,不是真的去改造。
其次,";i:4;a:4:{s:3:"tag";s:1:"b";s:6:"option";N;s:8:"original";a:2:{i:0;s:3:"[B]";i:1;s:4:"[/B]";}s:8:"children";a:1:{i:0;s:12:"这是关键";}}i:5;s:3:",";i:6;a:4:{s:3:"tag";s:1:"b";s:6:"option";N;s:8:"original";a:2:{i:0;s:3:"[B]";i:1;s:4:"[/B]";}s:8:"children";a:1:{i:0;s:102:"我认为即使在遥远的未来,拥有了更高科技文明的人类也不大可能会去这么做";}}i:7;s:975:",为什么?一句话回答,因为如此大规模的去改变改造地球生态,是极其危险且不明智的。具体原因,打算从生态系统与生态伦理的角度尝试回答一下。
《沙丘》被誉为是一部生态科幻小说,作者弗兰克赫伯特在扉页致辞中写道“献给那些沙漠生态学家,不管他们人在何方,劳作于哪个年代。谨此,谦卑且景仰地奉上这本预言之作。”因此以生态视角来解读这个问题也算是呼应主题,具体举两个例子来进行解读:
一、沙丘小说的灵感就源自俄勒冈州的滨海沙丘,我们就系统的了解一下这片沙丘的生态与治理,尤其是美国针对这片移动沙丘的治理,从弗兰克赫伯特创作《沙丘》小说的年代开始,直到今天,治理观念与方式产生了巨大的转变,相信通过了解这个转变的过程,一定会改变人们对沙漠治理甚至生态治理的部分看法。
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俄勒冈滨海沙丘
《沙丘》的原型,位于美国俄勒冈州佛罗伦萨市以南,通常被称为俄勒冈滨海沙丘,其面积大约一万三千公顷,这片沙丘已经有上百万年的历史,是北美最大的沿海沙丘。
形成这片沙丘的沙粒,主要来自洛矶山脉以及一些沿海山脉随雨水冲刷沉积而来的砂石颗粒,随水流汇入海洋,然后经由海洋潮汐,冲刷上岸,在受来自西面的海风吹动之下,不断向内陆移动,从而形成了这片独特的移动沙丘景象。
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这片移动沙丘在不同季节受到不同天气的影响,向内陆移动的同时也形成了一个不断变化的独特地貌环境,比如暴风雨会让沙丘地带中出现堰塞湖、如此不断变化的地貌创造出了一个由多种不同植物与动物(据研究统计,从甲虫到熊,沙丘地带的昆虫与动物就多达 400 种以上)随沙丘而变化的沙丘生态系统,和谐共生。
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暴雨过后的堰塞湖
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独特的移动沙丘地貌
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多种当地植物
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Siuslaw 毛颈虎甲虫,爬行速度最快的昆虫之一
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西部雪鸻
据考证,大约在 8 千年之前,这片沙丘地区出现了北美原住民的足迹,他们适应了移动沙丘环境,能够从中获得相应的生活资源,从而在这里定居下来。
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库斯族人
但到了 19 世纪末 20 世纪出,外来人口(欧洲定居者)不断在这片地区的剧集,他们从俄勒冈内陆向西迁移殖民至此,并且随着航运的发展,在这片地带的人类社区开始快速扩充,公路通向了海岸,不可避免的开始改变这片移动沙丘环境,并因此意识到移动的沙丘对人类的扩张造成了影响,比如对公路、建筑、水渠等设施。
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于是从 20 世纪初开始,人们开始针对这个移动的沙丘进行治理,采用的方式就是引入固沙植被,比如欧洲沙滩草、苏格兰扫帚松、金雀花等,到了 30 年代,随着 101 高速公路的建设,固沙运动随之进一步扩大,一直持续到了 50 年代(弗兰克赫伯特来到佛罗伦萨市,产生写作灵感)
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顽强的欧洲沙滩草
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外来植物已经开始改变沙丘地貌,绿色覆盖了沙地,由于这些外来杀生植物具有极强的生命力,根系发达,随着时间的推移,慢慢的,果然牢牢锁住了海边的大片沙丘,从而使得西风不能将海边的沙粒吹向内陆,同时海边的沙丘也开始隆起,越磊越高,这道沙丘之后的地带则没有了移动的特性,植物开始固定生长,形成了大片的永久性湿地与森林,从而使得开阔的沙丘生态被根本性改变。
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可能不少人直觉上会认为,沙丘变成森林湿地不是很好吗?其实这个观点在当地也持续了相当久的时间。但随着生态学的发展,以及环保主义运动和其背后环境伦理的更新,人们逐渐意识到,人为的改变当地本来已经稳定的自然生态,是不明智的,其造成的影响很有可能会是推倒了生态系统的第一块多米诺骨牌,后续的影响不可预估。尤其是虽然从 6-70 年代开始,外来植物的引入已经停止,但外来植物的生长却越来越快,影响进一步扩大,从而抢占了本地植物的生存环境,也使得一些特有动物的栖息地开始消失。
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对俄勒冈州滨海沙丘看法以及治理观念的改变,体现了现代环境伦理价值观的从人类中心主义转向了生态中心主义,那种不顾自然环境的野蛮发展,或改造环境以适应人类发展的观念与模式,变成人类不仅仅保护生态环境,适应环境的发展,还需要尽可能的去纠正自己之前的一些行为,尽量减少其造成的后果。
进入本世纪,一些恢复当地原有生态的呼声与活动,开始增加,人们主要采取的行动就是减少外来物种,以消除其造成的影响,但这个难度显然是巨大的。
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让这片沙丘恢复移动,恢复原有的独特生态。是当地的生态治理口号。
2014 年,美国林务局成立了一个战略小组,负责制定“俄勒冈沙丘恢复战略”。2016 年 10 月,俄勒冈沙丘恢复合作组织 (ODRC - Oregon Dunes Restoration Collaborative) 成立,以继续该小组的工作。工作内容主要就是鼓励游客与志愿者对欧洲沙滩草这类外来植物进行人工清除工作,并呼吁捐款支持当地生态重建,因为欧洲海滩草的生命力极其顽强,不除去根系,很快还会恢复。
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2004 年利用推土机清理的一片沙地,由于缺乏定期维护,到 2012 年已经成片恢复了
因此,恢复沙丘原有生态不可能一蹴而就,预估将可能长达数十年,就像当初引入植物固沙一样长久。
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虽然外来植物也是自然生命,也建立了一些新的生态,但之所以要去除这个影响,也源自于生态中心主义而非生物中心主义的环保理念,也就是自然生态的优先级是最高的,生态中的物种如果影响了生态稳定,则应该予以修正。
为什么沙漠不该被彻底改造,举出的第二个例子,就是沙漠在全球自然生态中的作用
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撒哈拉沙尘的迁移路线
撒哈拉沙漠是世界上最大的沙尘来源。它产生了全球约 55%的灰尘排放(通过沙尘暴),对北大西洋、加勒比海、地中海和红海产生了显著影响。据估计,沙尘暴平均每年向海洋输送 5 亿吨矿物质和营养素、有机物和无机物。沙尘对海洋生物多样性产生一系列影响。灰尘是外部提供的养分和微量金属的主要来源。这些元素对于所有生命形式都是必不可少的,大气提供的元素可以通过统称为浮游植物的单细胞生物来控制海洋的初级生产。这个关键的新陈代谢过程推动着海洋中的生物地球化学循环,包括碳、氮、硫、磷和硅的循环。另外撒哈拉的沙尘暴还为亚马逊雨林提供了大约每年 2.2 万吨的磷,这对作为地球之肺的亚马逊雨林来说,是至关重要的。
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由此可见,沙漠在全球的自然生态系统中,有着其重要的作用和意义,改造它以适应人类居住的行为,不仅会严重影响全球生态,到头来恐怕整个地球都不再适应人类居住了。
所以,我相信未来人类不会去彻底改造沙漠以适应人类的,而是与沙漠保持和谐共生的状态。
其实从沙丘系列小说中,也可以挖掘出作者弗兰克赫伯特本人,对生态的理解与思考。这点不该被大家所错过!
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