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氢氧同位素是示踪流域水循环过程的有效方法,水是维系哈尼梯田景观稳定性的关键.以哈尼梯田文化景观遗产核心区的麻栗寨河流域泉水为研究对象,通过采集不同海拔的33个样品分析泉水氢氧同位素的海拔效应.结果表明:总体上看,泉水氢氧同位素随海拔的上升而下降,其递减率随海拔增加而变大,并具有高、中、低三段海拔分异的特征;低海拔段(1 060 m以下)和高海拔段(1 510 m以上)均具有明显的海拔效应,但中海拔段(1 060~1 510 m)相关关系不显著;泉水氢氧同位素关系方程与全国大气降水线相比斜率略小,说明在泉水形成之前曾受雨量效应、蒸发作用和补给等因素影响;在氘盈余方面,低海拔段的d值与全国大气降水线相当,中海拔段明显低于全国大气降水线,高海拔段明显高于全国大气降水线,说明研究区泉水存在强烈的混合作用,且其海拔效应是在补给水源多次循环和利用过程中形成.
Hydrogen and oxygen isotopes are an effective method to trace the water cycle in water basin, and water is the key to maintaining the landscape stability of Hani terraces.Taking spring water in Malianzhai basin in the core area of Hani terraced rice culture landscape as the research object, 33 water samples collected from different altitudes The results showed that the hydrogen and oxygen isotopes of spring water decreased with the rise of altitude, and the decreasing rate of hydrogen and oxygen isotopes of spring water became larger with altitude increasing, with the elevation of middle, (Lower than 1 060 m) and high altitude (above 1 510 m) all had significant elevation effects, but the correlation was not significant at the mid-altitude (1 060-1 510 m); the water-oxygen isotope The relational equation has a slightly lower slope than the national precipitation line, indicating that rainfall was affected by rainfall, evaporation and recharge before the spring water was formed. In the deuterium surplus, the d value at the lower elevation is similar to the national precipitation, The elevation is obviously lower than the national precipitation, and the high altitude is obviously higher than the national precipitation, indicating that there is a strong mixing effect of the spring water in the study area and the elevation effect is due to multiple cycles of recharge Formed during use.