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长寿之乡麻阳的生态地球化学特征研究

2020-08-06林治家,王珍英,胡航,宋江涛

国土资源导刊 2020年2期

林治家,王珍英,胡航,宋江涛

文章编号:1672-5603(2020)02-10-5

摘 要 微量元素与人体健康具有密切的联系,其对人体的生长、发育、衰老、死亡起着至关重要的作用。在前人研究基础上,从生态地球化学入手,研究了麻阳县两个长寿村和一个对照村的地表水和表层土壤中的生态地球化学特征。结果表明,水中溶解氧含量高、NO3-含量低、Cl-相对较低、F-相对较高有利于长寿;土壤碱性环境和高Se/Cd比值能显著降低水稻对Cd的吸收,有利于人体健康。同时,复杂的地质背景造成了不同研究点的生态地球化学背景差异显著,使得微量元素含量与人体健康长寿关系的分析复杂化和不确定性。

关键词 麻阳;长寿;微量元素;生态地球化学

中图分类号:X142 文献标识码:A

Study on Eco-geochemical Characteristics of Mayang County Chinese Longevity Area

Lin Zhijia ,  Wang Zhenying , Hu Hang , Song Jiangtao

(Hunan Institute of Geological Survey, Changsha Hunan 410116)

Abstract: Trace elements are closely related to human health, which play an important role in human growth, development, aging and death. On the basis of previous studies, the eco-geochemical characteristics in surface water and surface soil of two longevity villages and one control village in Mayang county were studied. The results showed that high dissolved oxygen content, low NO3- content, relatively low Cl- and relatively high F-in water were beneficial to longevity; It was beneficial to human health that alkaline soil and its high Se/Cd ratio could significantly reduce the absorption of Cd by rice. And, significant differences in the eco-geochemical background of different research sites were caused by the complex geological backgroundwhich made the analysis of the relationship between trace element content and human health and longevity complicated and uncertain.

Keywords: Mayang; longevity; trace element; eco-geochemistry

0 引言

环境中的微量元素是长寿的重要物质基础。多个长寿区的研究表明,长寿地区居民的生活环境以及百岁老人体内存在一个有利于健康长寿的优越微量元素谱[1]。同时,由于长寿区生态地球化学背景的差异,导致不同长寿区人群中的有益和有害元素谱系存在较大的差异[2, 3]。

麻阳县是我国首批官方认定的“中国长寿之乡”,前人曾经从自然地理[4]、民俗[5]、文化[6]和生活习惯[7]等多个角度进行过论述。本次是首次从生态地球化学背景角度出发,选取麻阳县两个长寿村、一个对照村,通过土壤和地表水中微量元素的分析,开展麻阳县生态地球化学特征研究。

1 研究区概况

麻阳县位于湖南省西部,怀化市西北部。境内南北西三面群山屏列,地势较高,中部较低,朝东倾斜开口,呈筲箕状。……

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