苍山万花溪流域旱季土壤水氢氧稳定同位素组成空间分布特征与土壤水贮存量的关系
Relationship between Spatial Distribution Characteristics of Soil Water Hydroxide Stable Isotope Composition and Soil Water Storage in the Dry Season in Wanhua Creek Watershed, Cangshan, China
DOI: 10.12677/hjss.2024.122012, PDF,   
作者: 卢瑞涛：云南师范大学地理学部，云南 昆明
关键词: 苍山；氢氧稳定同位素；土壤水贮存量；Cangshan； Stable Isotope of Hydrogen and Oxygen； Soil Water Storage
摘要: 氢氧稳定同位素组成和土壤水贮存量是研究区域土壤水分特征的重要手段，本文基于万花溪流域土壤水氢氧稳定同位素数据和土壤水贮存量数据，分析其数据特征，以此探讨其在流域上的空间分布格局以及土壤水贮存量与氢氧稳定同位素组成之间的相关关系。结果表明，研究区土壤水δ18O为−15.40‰~0.75‰，均值为−10.45‰；δD值变化范围为−116.11‰~−5.95‰，均值为−80.79‰，空间差异极其显著；拟合的各层土壤蒸发线的截距和斜率均随土层深度的增加而增加，且均小于大气降水线，说明各层土壤水均受到强烈的蒸发分馏作用并且随土层深度增加而减弱；土壤水贮存量与氢氧稳定同位素组成具有显著的相关关系，且为土壤水氢氧稳定同位素组成的主要影响因素。本研究对苍山地区水文循环研究以及水文资源的合理分配与利用具有积极意义。
Abstract: Hydrogen and oxygen stable isotope composition and soil water storage are important means to study the regional soil moisture characteristics, this paper analyzes the data characteristics based on the soil water hydroxide stable isotope data and soil water storage data of Wanhua Creek watershed, so as to explore the spatial distribution pattern on the watershed and the correlation between the soil water storage and the composition of hydroxide stable isotope. The results showed that the δ18O of soil water in the study area ranged from −15.40‰ to 0.75‰, with a mean value of −10.45‰; the δD value varied from −116.11‰ to −5.95‰, with a mean value of −80.79‰, and the spatial difference was extremely significant; the intercept and slope of the fitted evapotranspiration line of each layer increased with the depth of the soil layer, and they were all smaller than that of the atmospheric precipitation line, which indicated that the soil water of each layer was subject to strong evaporative fractionation. The intercepts and slopes of the fitted soil evaporation lines increased with soil depth and were smaller than the atmospheric precipitation line, indicating that soil water in all layers was subjected to strong evaporative fractionation and weakened with soil depth. This study is of positive significance to the study of hydrological cycle and the rational allocation and utilization of hydrological resources in Cangshan.
文章引用：卢瑞涛. 苍山万花溪流域旱季土壤水氢氧稳定同位素组成空间分布特征与土壤水贮存量的关系[J]. 土壤科学, 2024, 12(2): 90-105. https://doi.org/10.12677/hjss.2024.122012

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