生命的奇迹,额济纳胡杨林

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额济纳胡杨林二道桥三道桥四道桥旅游 |
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晋人秦氏
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胡杨介绍:
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胡杨介绍:
胡杨是落叶中型天然乔木,高10-20米,树龄可达200年,树干通直,树叶奇特,生长在幼树嫩枝上的叶片狭长如柳,大树老枝条上的叶却圆润如杨,叶子边缘还有很多缺口,又有点像枫叶,故它又有“变叶杨”
“异叶杨”之称。胡杨能生长在高度盐渍化的土壤上,原因是胡杨的细胞透水性较一般植物强,它从主根、侧根、躯干、树皮到叶片都能吸收很多的盐分,并能通过茎叶的泌腺排泄盐分,当体内盐分积累过多时,它便能从树干的节疤和裂口处将多余的盐分自动排泄出去,形成白色或淡黄色的块状结晶,称“胡杨泪”,俗称“胡杨碱”。当地居民用来发面蒸馒头,因为它的主要成分是小苏打,其碱的纯度高达57%~71%。除供食用外,胡杨碱还可制肥皂,也可用作罗布麻脱胶、制革脱脂的原料。一棵成年大树每年能排出数十千克的盐碱,胡杨堪称“拔盐改土”的“土壤改良功臣”。胡杨全身是宝:它的木质坚硬,耐水抗腐,历千年而不朽,是上等建筑和家具用材;树叶富含蛋白质和盐类,乃是牲畜越冬的上好饲料;胡杨木的纤维长,又是造纸的好原料,枯枝则是上等的好燃料。它对温度大幅度变化的适应能力很强。它生长的水分主要靠潜水或河流泛滥水,所以具有伸展到浅水层附近的根系。它又具有强大的根压和含碳酸氢钠的树叶,因而能抗旱耐盐。胡杨林是荒漠区特有的珍贵森林资源,它的首要作用在于防风固沙,创造适宜的绿洲气候和形成肥沃的土壤。胡杨林和嫩枝是荒漠区的重要饲料;木材虽不理想但在缺材的荒漠却仍不失为重要用材;从树干切口流出的汁液是食用碱和制肥皂的原料,又可入药,当地群众称为“胡杨泪”或“梧桐泪”(因叶似梧桐叶而得名),叶和花均可入药,因此胡杨是沙漠中的宝树。额济纳胡杨林区是世界仅存三处之一,且保护最为完整。现有数百年的胡杨,仍枝繁叶茂,领尽大漠瀚海风骚,是大自然独钟的奇迹。
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