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  发表人邮件:sflsjfl@gmail.com   发表时间:2018/12/25 8:08:05
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  发表人邮件:yuguhun1@126.com   发表时间:2018/12/24 18:26:08
    – state of wreckage delays extraction of bodiesBy Keeran DannyDead: Blake Slater and Dwayne JacobsThe bodies of missing pilot,Scarpe Nike Air Max Scontate, Blake Slater and cargo loader, Dwayne Jacobs were discovered by Guyana Defence Force troops after 07:00hrs yesterday morning among the wreckage of the Trans Guyana Airways 700 Cessna Caravan 8R-GHS, 5.4 km south-southwest of Olive Creek in the Mazaruni Jungle.The pilot’s body was found in his seat.According to the Guyana Civil Aviation Authority ((GCAA), the bodies have not been recovered. The extraction process is a meticulous one because of the state of the wreckage and risk of fire.The team comprising one officer and nine ranks will continue the extraction process today.Troops,Wholesale Jerseys, equipped with chainsaws and other necessary cutting tools had to clear virgin forest of tall trees ranging from 75-ft to a 100-ft in the swampy, hilly terrain along the one-mile stretch from where they rappelled in on Saturday to access the wreckage.They were tasked with clearing a helipad to facilitate the extraction of the bodies. This was done about 100 metres away from the crash site. The soldiers would have to cut the aircraft to remove the bodies.According to an individual close to the operation, the troops would utilize the helicopter to transport the bodies to Olive Creek,Wholesale Jerseys 2018, following which they would be transferred to a caravan destined for Georgetown.The troops are expected to come out of the interior today.? They are not responsible for recovering the wrecked plane. The investigators would have to go in and inspect the crash site.Trans Guyana Airways ((TGA) and the GCAA informed the relatives of the deceased early yesterday morning of the discovery and confirmed their worst fears.In an interview with this publication yesterday, Sean Jacobs related that his brother, Dwayne Jacobs, was employed with TGA for about 10 years and made regular trips in Guyana’s interior. Following the news of Jacobs’ demise,Clearance NCAA Jerseys, Sean cleared his brother’s locker at TGA and made a comforting discovery.“I found a prayer sheet in his locker and I am comforted by the fact he had accepted God before his death…At least I know God was with him when the plane was going down…I always tell my brother what my mother tells me; to keep God close and love God because he will protect you and be with you.”Sean related that since the news of the missing plane and crew on Saturday, it had been a difficult and confusing time for family members who longed to hear “something or anything” about both men. He said in a sense, the worst was known,Wholesale Jerseys China Shop, but everyone was hoping and praying that the outcome would have been positive.The Jacobs’ surrounded by close friends and a Pastor, were engaged in prayer sessions for the well being of Dwayne and Slater over the weekend.With pain in his voice Sean said, “It was a hard way to go but die you must…I tell my mother death is a must…Mommy taught us to pray and that is the way to God.” He noted that his mother is not taking the message lightly.Meanwhile, the parents of Slater do not live in Guyana. He resided with relatives. Slater worked with TGA for about three years. ?He had been flying in Guyana for quite some time, and completed the requisite minimum of 200 flying hours under supervision before being certified to fly in the interior.When contacted, Slater’s cousin, Tracy Vieira, was understandably unable to speak to the media.On behalf of the Board of Directors, Management and Staff of LIAT,Camiseta Real Madrid Champions, acting Chief Executive Officer Mrs. Julie Reifer-Jones expressed deep regret over the death of the two persons.“Our thoughts and prayers are with the families of the captain and his lone passenger who both perished in the crash,” Mrs. Reifer-Jones said.On Saturday, at approximately 10:56hrs,Cheap NBA Jerseys Wholesale, the Air Traffic Control Tower received a report from another Trans Guyana’s aircraft that the company’s Cessna Caravan 8R-GHS reported going down after takeoff from Olive Creek aerodrome on a shuttle operation between Olive Creek and Imbaimadai.The body immediately activated the rescue coordination centre at the Air Traffic Control Tower, Timehri. The pilot who reported the aircraft’s distress was only able to hear the latitude coordinates of the airplane. This allowed the authority to plot an approximate position where the plane had crashed.The airplane’s emergency locator beacon was not triggered and no smoke emanated from the site. As such, the exact location of the plane was unknown on Saturday evening when the search ended for the night.
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    …say Christmas looks gloomyMore protest action was the scene at City Hall yesterday; this time it was municipal nurses demanding the immediate payment of salaries owed to them over a five-month period.At least two nurses who commenced services with the Mayor and City Council in August last,NFL Jerseys China, are yet to receive payment from since then. The nurses who perform midwife duties are stationed at various health facilities in southern city communities. They were supported by several of their co-workers who protested in solidarity. The nurses staged their action in the City Hall parking lot; facing the office of the Town Clerk, who, according to them ((nurses), is refusing to sign off on their payments.Shandra Hanover said she has been in the medical profession since 1981. The senior nurse said she had earlier retired from the post as midwife,Maillot Coupe Du Monde 2018 Officiel, but had returned to the job given the shortage of nurses. Sharon Chase said she too had started out in the medical profession since 1987, but had worked with various medical agencies in different capacities, until joining the municipal nurses.Nurses protest in solidarity with colleagues, Sharon Chase ((left) and Shandra Hanover ((second from left)They both stated that in August they came onto the job, but to date there has been no payment. The women said they have made inquiries but were unable to get a definite answer. Hanover said that questions related to their payment were posed to the Council’s Personnel Department,Wholesale Nike Baseball Jerseys, but they were told that the money have to be approved.The medical workers said they also went to the Ministry of Labour since October and an individual named Mrs. Williams had promised to help. They said they were advised by the Ministry not to stay away from the job since they could be recognized as leaving the job. However, to date there has been no response on to the matter from the Labour Department.Other nurses who used their lunch break to express solidarity with their co-workers described the treatment of the nurses as “unreasonable and depressing.” One nurse said that the non-payment could have happened to any one of them and it is unfair to workers who would have put time and effort into learning their trade.“We are trained to do our jobs in a professional manner and we must be paid,China Jerseys, because we have families to take care of and lives to live,Nuova Maglia Juventus 18/19,” another nurse stated. It was expressed further that the nurses at yesterday’s exercise are those who service communities such as Albouystown, Festival City and other depressed areas that desperately need the already inadequate service that is provided.Both Hanover and Chase said that it is very difficult functioning without their salaries. When asked about bills and Christmas preparations, “They ((bills) are backing up,” Hanover responded,Maillot Psg 2019 Pas Cher, while Chase expressed concern over being able to bring Christmas cheer to her family.The unpaid nurses said they are not contemplating leaving the job because they love what they do and the areas they serve are desperately in need of it. They had mentioned also the overtime and extra effort that they are putting into their jobs, especially during the recent flood which delayed service and caused a back-up in patients.Mayor Hamilton Green explained that his understanding of the matter is that the payments for the nurses have been on the Town Clerk’s desk for some time, having been sent there by the Council’s Treasurer’s Department. He said information from the personnel department is that in the hiring of the nurses, all procedures were followed and the nurses were “duly” employed. He said the Council’s Health Department has a shortage in medical workers and vacancies were available. The Treasurer’s Department approved the payments, but the Town Clerk is yet to sign off.When media personnel sought a comment from the acting Town Clerk, Carol Sooba,Wholesale Jerseys, at her office, her personal security, informed that she was unavailable.This is the second set of protest action outside of City Hall. Union members had for two days shut down city markets among other municipal arms when they were not paid their five percent increase. An emergency meeting brought an end to those protests when it was decided that the workers have to be paid. The nurses have promised, however, to forfeit their lunch break in support of their colleagues until they are paid their salaries.
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    四川若尔盖草原泥炭沼泽逐渐萎缩 沙丘面积扩大
若尔盖辖曼乡文戈村,流动的沙丘。每年,县林业局都会对全县草原沙化状况进行普查,每次都有新的土地被纳入沙化名单,就像在土地上不断揭开新的伤疤。 南都记者 杨传敏 摄 若尔盖县林业局的甲央指着一片沙丘说,“去年它还在网栏外,今年就‘跑’到了里面”。 南都记者 杨传敏 摄 若尔盖草原上这样裸露出来的沙坑随处可见。 南都记者 杨传敏 摄 丘巴从含沙层中取出的饮用水,有股铁锈味。 南都记者 杨传敏 摄
第8期 元年行动
对于中国,气候变化之影响,不仅在于城市温度的升高,沿海风暴的频繁。气候变化首先袭击的是中国西部的生态脆弱区,它们往往也是最重要的生态屏障。
记者走访了有“高原水塔”之称的四川若尔盖草原,它是黄河和长江上游的重要水源涵养地。泥炭沼泽的地质构造,令它在雨季吸水、枯季放水,就像一块调节气候的天然海绵。这片泥炭沼泽的形成可追溯到万年前,然而最近几十年,咸宁电导热油炉,在人为干预和全球变暖的影响下,泥炭沼泽逐渐萎缩。
如果若尔盖彻底沙化,可能会成为世界上海拔最高的沙漠之一,海拔3500米。与之作为对比的是,已经成为北方沙尘暴来源的内蒙古草原,海拔高度只有一千米左右,就能吹到几百多公里远的北京。
另一方面,若尔盖也是中国最大的泥炭沼泽湿地。高原海拔高、气温低,植物在枯死之后并不会马上腐烂,而是逐渐形成泥炭。若尔盖湿地藏匿着丰富的甲烷。若是草原萎缩,甲烷溢出后也可能成为新的温室气体来源。
“冬天的沙有点凶,就像着火一样”,谈起若尔盖草原上的沙子,玛加的眉毛就皱起来了,好像他面前就是一片沙尘。但他面前的却是漫无边际的草原,空气里还弥漫着草的腥味,最美好的夏天快要过去,沙尘的味道已经隐隐约约飘荡在空气中。青草转黄,一个月后,若尔盖草原便会进入漫长的冬天,令他担忧的沙尘就会到来。
玛加是四川若尔盖县麦溪乡查科村的牧民,他就住在沙丘背后。这些沙丘的面积正在逐年扩大,他可以感觉到沙子的威胁,“一年可以走五十到六十米”,他说,“冬天沙尘暴吹来的时候,甚至看不清楚对面的房屋”。
草原上的风愈来愈大,卷带着沙丘里的尘埃,把草原变成沙海。这是冬天才会出现的景观,还有一两个月,这种景观就会出现。
他所在的查科村和泽修村、嘎沙村相邻,同属麦溪乡,属于黄河三角洲地区,毗邻黄河支流黑河,同时也是若尔盖沙化最严重的地区,每年冬末春初,草原景观就变成漫漫黄沙。玛加说,冬天的草原,摩托都站不稳。
若尔盖县林业局统计,该县草原已有1/10面积不同程度沙化。在漫无边际的草原上,泥潭陷阱已经被风沙的威胁取代。在中国青藏高原的东部边缘,高原湿地正在逐渐干化,作为季风通道之一,若尔盖草原的沙化趋势影响深远。
生活在沙尘中
泽修村有850人定居,每年春天,拉出村庄的运沙卡车就有一百多辆
即使是秋天的微风,沙子也会随风而走。在冬天它们会成为草原的主人。60岁的丹珍措是麦溪乡泽修村牧民,她把每一扇门窗都用密封条封闭,但沙子还是会入侵,钻进她的毡巴和青稞。
“这样的粮食吃下去不健康”,丹珍措说,“冬天每天要扫2-3次地”,每天把沙子堆积到院子里。没别的地方堆,村子里也全是沙子。在牧民居住的院子,沙子会越堆越厚,有的家庭一米高的院墙,几乎会全部被黄沙覆盖。
牧民在电视上看到过北方铺天盖地的沙尘暴,他们在心中默默***了个比较,自认为若尔盖冬天的恐怖可和北方相比。
若尔盖是中国最美的草原之一,曾有风吹草低现牛羊的景观。它海拔在3500米左右,济宁电加热导热油炉,属长江黄河上游,四季不分明,没有春秋,只有冬夏。但现在,若尔盖草原退化已经是不争的事实,走在草原上,草还长不到膝盖。
漫长的冬季结束之后,万物复苏的3月,却是草原最难熬的时候,旧草已经被牛羊全部啃噬完,新草还没来得及长出,草原上见不到一点绿色。漫漫黄沙一直要持续到每年4月,草苗渐渐长高,沙尘弥漫的生活才会结束。
沙子侵入牧民的生活,也蚕食他们赖以生存的草原。草原退化直接威胁着牧民的经济收入,比如查科村的玛加,牛羊比过去少了一半。泽修村的丹珍措,家养的牛羊也减少了四分之一。
每年春天,麦溪乡牧民的第一项工作,就是把积存在道路上、院墙内的沙子用车拉走,搬出村庄,他们会选择一个几公里远、凹陷下去的地坑,或者倾倒在黄河、黑河的河道边。泽修村有850人定居,村长下美告诉记者,每年拉出村庄的运沙卡车就有一百多辆。
而这仅仅是权宜之计,冬天一到,沙子又会以更凶猛的速度卷土重来。
不断扩大的沙漠
甲央指着一片沙丘说,“去年它还在网栏外,今年就‘跑’到了里面”
“不光是若尔盖的问题”,曾经的“绿色骆驼”组织成员饶永说,“整得不好对北京都有影响”。
饶永过去几年的身份是“绿色骆驼”的成员,这是一个致力于川西北沙化治理的民间组织,成立于2002年,当时因为理想主义的治沙情怀,被国内知名媒体广泛报道。而现在,这个组织已经陆续解散,饶永和葛永新是坚持到最后的两个,他们还留在若尔盖,都娶了本地人***妻子。
饶永今年33岁,葛永新已经42岁。现在他们的身份基本与沙化治理无关了,饶永考上了村官,葛永新则当上了牧民,两个外乡人,皮肤晒得黝黑,看起来就像当地的牧民。
饶永说,当时是凭着信念坚持,从家里自筹钱到草原上种高山柳。
但这种方式就像烧蜡烛,热情得不到支持,总有燃尽的时候。“绿色骆驼”成为过去,草原的沙漠化仍然在继续。
在沙化最严重的麦溪乡,夏季放牧点,已经变成一片连绵的流动沙丘,成为麦溪乡冬季沙尘暴的主要来源,它是在过去十几年里逐渐连接成片的。若尔盖县林业局曾经对这些沙丘进行过治理,因为后续资金投入不足,仍然没有阻止沙化蔓延。
这沙丘距离黄河只有两三公里,现在它延绵几十公顷,就像一片沙漠。沙丘的正面反面都是沙漠,而它们在十年前,还不过只是一些裸露出黄沙的小山坡。
夏科看着沙丘的变化,他是泽修村龙哇寨的寨长。他指着寨子里一片凹陷下去的足球场大小的沙地对记者说,当他还是小孩子的时候,它根本不存在。
草原的退化就像一个恶性循环,沙化会扩散,会形成更严重的沙化。最早沙丘只是一个土坑,鼠兔啃噬了草根,掘出黄沙,年复一年,沙子随风吹散。土地逐渐凹陷,露出草原水源退缩之后的本来面目???厚厚的沙层。
这样的例子太多。阿溪乡的谢玛拉也,扩张到十几公顷,附近土地已经不适合放牧,牧民陆续撤离。
沙漠往往从一片微露草皮的黄土开始扩大,草原上的牧民最了解这种悄无声息的变化。比如“绿色骆驼”葛永新,他变成了牧民,最近几年,他发现钻的井越来越深。他也看到了高原海子的萎缩。
每年,若尔盖县林业局都会对全县的草原沙化状况进行普查,每次都有新的土地被纳入沙化名单,就像在土地上不断揭开新的伤疤。在辖曼乡文戈村,一位若尔盖县林业局的甲央((藏名)就指着一片禁牧区里的沙丘告诉记者,“去年它还在网栏外,今年就‘跑’到了里面”。
在沙化最严重的辖曼乡、麦溪乡,流动的沙丘成为草原上的另一道景观。若尔盖县林业局副局长左林治沙十几年,他穿的是运动服,这身打扮和他的工作很协调,因为治沙是需要下乡跑点的,经过林业局治理的沙丘无数,每年他们都会对草原沙化的面积定量统计,他告诉记者,治理速度赶不上沙化速度,在过去五年里,这些沙丘还在以每年百分之十的速度递增。
若尔盖林业局2009年的沙化调查资料显示,该县一共有七百多平方公里草地不同程度沙化,占草原总面积的1/10,而且沙化的进程在加快。按照沙化程度不同,可以分为三类:一类是流动沙丘,这是最严重的沙化,占8.2%;一类是半固定沙丘和固定沙丘,约占沙化面积的15%;其余是散布的点状沙地,若不及时治理,很可能会扩散。
消失的沼泽
很多人知道若尔盖草原是因为红军长征,但现在杀人的沼泽已成为历史
沙子的增加,只是若尔盖草原变化的表面现象,更深刻的变化是草原上水和水源的减少。
此长彼消的是,湿地没有过去那么湿了。草原上的牧民见证了高原海子的逐渐干涸。走到辖曼牧场,可以看见罗***措,像是一个小水塘。但其实这里是一个天然的大湖泊,葛永新告诉记者,2002年,罗***措水还很大,大约有7-8平方公里。
为了摸清若尔盖湿地退化的基本情况,若尔盖县国家湿地管理局正在对湖泊河流状况进行监控,副局长张明告诉记者,监测显示,若尔盖湖泊、河流逐年萎缩,比如若尔盖草原上的三大湖,就有两大湖萎缩了将近1/3.哈丘湖过去是600多公顷,现在只有400公顷,措拉坚湖,过去有400多公顷,现在只有300多公顷。还有一些湖泊已经完全干涸,比如木措,湖面上甚至可以赛车。
沼泽和湿地也逐年退化。很多人知道若尔盖草原是因为红军长征,但现在,杀人的沼泽已成为历史,草原上的沼泽已经基本消失。在若尔盖湿地,草原上牧民过去是骑马放牛羊,不小心马腿就陷入泥里,但现在很多人已经改骑摩托车,在草原上可以任意驰骋。
记者发现,草原生态系统的改变非常立体,除了沙化、沼泽、湖泊萎缩,地下水位也明显下降。泽修村村长下美回忆说,在他小时候,草原上根本不用挖井,到处都是泉眼。但现在水源逐渐减少,十多年前,牧民开始掘井取水,只用挖到2-3米,现在则要挖到十多米。泽修村只有1个天然泉眼,根本不够用,每家每户只要有条件,都挖井向地下取水。
这些井通常寿命只有几年,土层失水变成松散的沙层之后,井就塌陷了。丹珍措家的井挖了好几次都不成功,她便去邻居69岁的丘巴家里接水。而丘巴的井状态也不好,随着水分流失,下层土壤也逐渐沙化,井水在最近这两年越来越黄,水质逐渐浑浊。
丘巴从井里打上一桶水给记者看,仅凭肉眼就可清晰见到,这桶新鲜的井水里跳动着无数细小的沙子。即使沉淀了几个小时,水依然很浑浊,丘巴准备了一口大塑料桶专门沉淀井水,他用来从这个桶里取水的铝瓢,瓢底发黄。水中还有股铁锈味。
记者采访时,若尔盖草原正在铺展延伸的自来水管道。在某些地下水已经基本枯竭的地方,甚至要挖到上百米才能找到干净水。比如泽修村中心校2008年打井,挖到80米深才见水,水混浊不能饮用,这口井便一直挖到了120米。
人沙之战
在泽朗甲年轻的时候,草里还能藏小孩,但现在这些草原已经不存在了
人和草原、沙漠的关系,从上个世纪开始逐渐紧张。去年,泽修村民丹珍措和女儿、儿子一起到黑河河滩上种树,这里也是沙化最严重的地区。这样的沙障随处可见,特别是在交通便捷的国道或者省道旁,会看到很多用高山柳编成的沙障。
这是治理沙化最常见的方法???种植耐旱植物。但作为一个年财政收入只有1400万的西部县,若尔盖还有很多交通无法到达的区域。比如辖曼乡的卡加村,就是只能靠牧道连接的村庄,村支书泽朗甲是一个老人,在他年轻的时候,草里还能藏小孩,但现在这些草原已经不存在了。在他的村庄,车子开不进去,沙化治理也无从谈起。
“从上世纪七十年代,草原沙化就已看出苗头”,若尔盖林业局长期治沙的副局长左林说,从2007年,四川省每年拨出500万用于若尔盖治沙,但仍然只能治理到点,不能遏制沙化。
也有惨痛的教训。上世纪七十年代,为扩大草场面积,若尔盖曾开沟排水疏干沼泽。湿地管理局副局长张明回忆说,当年农业大寨时期,曾经向沼泽要了100万亩土地,开沟300公里,把草原上的水排到黄河。
排沟放水只是一个序幕,草原干化的过程仍然在继续。在若尔盖采访期间,记者了解到的湿地退化的原因,可被归结为:过度放牧和气候变化。
走在草原上,很容易看到鼠兔掘出的洞穴,草皮全被掀翻,露出高高的沙坑。也能看到牛羊越过休牧期的铁网栏,或者在黄土斑驳的山坡上,还有几百只牛羊在其间啃草。
若尔盖畜牧局副局长汤茂林也承认草原牛羊超载,他的依据是,1978年,“北草办”曾经对若尔盖草地的资源理论载畜量进行过普查,认为若尔盖适合养殖186.5万个羊单位的牲畜,((一只马折算6只羊,1只牛折算5只羊)。按照这个标准,现在若尔盖草原上的牛羊有七成都不应该养。
另外,三十年过去了,没有机构再对草原的承载量作新的评估。但“现在的草场质量,已经比三十年前下降很多,所以理论承载量还应该减少”,汤茂林说。
为了保护草原,2005年起,宜兴油温机,在唐克乡,用村规约定,平均到每个人只能养10头牛、20只羊。每年年底要核定,超出数量的必须出栏。但维持这个数量,可能意味着牧民在经济收入上的牺牲。
汤茂林曾经去内蒙古考察过,发现当地退牧机制比较完善,由各级财政拿出钱给牧民退牧还草,在城乡修建安置房,通过培训实现再就业。但在县财政收入只有1400万的若尔盖((约相当于经济发达的沿海城市一栋别墅的价格),主要产业就是放牧和旅游,缺乏劳动型产业。
恶性循环
湿地退化之后,削弱风速、增加湿度和调节气候功能的减弱,又反过来影响了气候
和内蒙古草原受到工业化冲击不同的是,在若尔盖草原,几乎没有什么工业。人们普遍依靠农牧业生存,而且由于缺乏衔接九寨沟等热门景点的公共交通,旅游业也没有真正发展起来。夏天的草原上,会有很多自驾车游客。但到了冬天,他们就被严寒和风沙驱赶得无影无踪。
在这种背景下,气候变化对若尔盖的影响更为明显。中科院和中国气象局曾到若尔盖考察,提出了“以湿治沙”的思路,通过在草原人工降雨来缓解沙化,依据就是若尔盖草原的气候变化。
若尔盖位于青藏高原东南边沿,海拔平均3500米,长江黄河两条水系穿越其间,因其泥炭沼泽湿地的蓄水调节功能,被称作高原之肾。根据玛曲水文站资料,它给黄河上游补充了将近三成的水分。作为高原绿洲,若尔盖还有调节区域气候的作用。
但一个逐渐明显的趋势是,泥炭沼泽正在逐渐萎缩。在青藏高原东部边缘,湿地水分正在逐渐流失,这种变化又会反过来影响了区域气候。
一个事实是,草原的空气正逐渐“变干”,湿度也随之下降。若尔盖县气象局局长黄待富告诉南都记者,30年前和现在的气象资料对比,空气湿度下降了三个百分点。
而且,若尔盖草原的温度也在升高。若尔盖气象国家基本站成立于1957年,保存了53年的气象数据。统计表明,在过去20年,若尔盖气温上升了0.4℃。现在若尔盖的年平均温度是1.1℃,而就在上世纪末,它的年平均气温还不到0.7℃。
温度平均变化0.4℃,升温幅度似乎并不高,黄待富说,但这个变化趋势非常重要,它意味着若尔盖高温天气的增加,比如今年9月,温度还徘徊在20℃附近,很异常。通常在往年,若尔盖已经开始下雪,人们都要穿羽绒服,而现在牧民白天只用穿长袖T恤,晚上也只加一件单衣。
风的速度也在变快。若尔盖气象站向南都提供的统计资料显示,前30年,衡水电加热油加热器,若尔盖的平均风速是2.4米/秒,而去年的平均风速可达到2.7米/秒。牧民也可以感觉到风速的变化,很明显的是,草原的沙子扩散速度变快了。
温度升高和风速增大,直接影响了草原水分的流失。一个数字是,现在若尔盖的年平均降水量是600毫升,而蒸发量却达到了1200毫升。蒸发量是降雨量的两倍。在沙化最严重的辖曼乡、麦溪乡,靠近黄河河岸,降水量只有300-400毫米,低于若尔盖的平均降水水平。
水分流失成为若尔盖沙化的基础。而湿地退化之后,削弱风速、增加湿度和调节气候功能的减弱,又反过来影响了气候,这就像一个生态上的恶性循环。
比如,黄待富就发现,草原上的极端气候在明显增加,令他印象非常深刻的2009年11月,若尔盖曾经历过一次剧烈的降温,降温幅度将近25℃。短短几小时内,从2-4℃下降到零下23℃,而这在过去,从未出现。
南都记者 杨传敏 发自四川若尔盖
统筹:李召 杨传敏
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