氧同位素在浑善达克沙地杨树林土壤水分来源研究中的应用
作者:
作者单位:

1.安徽省·水利部淮河水利委员会水利科学研究院,安徽 合肥 230088 2.水利水资源安徽省重点实验室,安徽 蚌埠 233000

作者简介:

钱龙娇(1990—),女,工程师,硕士,主要从事水文学及水资源方向研究工作。

通讯作者:

安徽省水科学联合基金(2208085US16) 安徽省水科院科技攻关项目(KJGG202202)

中图分类号:

S274.1

基金项目:

/


Application of oxygen isotope in the study of soil water source of poplar forest in Hunshandake Sandy Land
Author:
Affiliation:

1.Anhui and Huaihe River Institute of Hydraulic Research, Hefei 230088, China 2.Key Laboratory of Water Conservancy and Water Resources of Anhui Province, Bengbu 233000, China

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    摘要:

    为探究内蒙古浑善达克沙地乔木林地土壤水分来源以及潜水与土壤水之间的补给联系,以正蓝旗杨树林为研究对象,基于氧稳定同位素示踪技术,结合两端元法分析降雨和地下水不同生长期对乔木林地土壤的贡献率,分析水分循环中大气降水、土壤水以及地下水“三水”δ18O 的季节性变化特征,结果表明:三水中地下水 δ18O 值变化幅度最小,土壤水中 δ18O 值变化幅度随着土壤深度加深逐渐变小,降水 δ18O 值季节性特征明显,当地降水线斜率小于全球降水线斜率,表明降水过程受到不同程度的蒸发作用影响。降水对土壤水的贡献率随土壤纵向加深而减少,其中表层(10~40 cm)土壤水主要受降水补给,平均贡献率为 81.90%;根系密集层(70~160 cm)土壤水受降水和地下水共同作用,降雨平均贡献率为 37.14%,地下水为深层(160~290 cm)土壤水主要贡献水源,平均贡献率为96.45%。夏季降雨强度和频次变化条件下,降雨对表层和根系密集层土壤水贡献范围受降雨量影响波动明显。

    Abstract:

    In order to investigate the source of soil moisture in the Populus davidiana forest in the Hulunbuir Sand Land, Inner Mongolia, as well as the replenishment relationship between groundwater and soil moisture, this study focused on the poplar forest in Zhenglan Banner. Using oxygen stable isotope tracing technology and the dual end-member mixing model, the contribution rates of rainfall and groundwater to the soil in different growth periods were analyzed. The seasonal variation characteristics of the δ18O values of atmospheric precipitation, soil water, and groundwater in the water cycle were also analyzed. The results showed that groundwater exhibited the smallest variation range in δ18O values among the three water sources. The δ18O values of soil water decreased gradually with increasing soil depth. The δ18O values of precipitation showed distinct seasonal characteristics, with a local precipitation line slope smaller than the global precipitation line slope, indicating the influence of varying degrees of evaporation during the precipitation process. The contribution rate of precipitation to soil water decreased with increasing soil depth. The surface soil water (10~40 cm) was mainly supplied by precipitation, with an average contribution rate of 81.90%. The soil water in the root zone (70~160 cm) was influenced by both precipitation and groundwater, with an average contribution rate of 37.14% from rainfall. Groundwater was the primary water source for the deep soil layer(160~290 cm), with an average contribution rate of 96.45%. Under changing conditions of rainfall intensity and frequency in summer, the contribution range of rainfall to surface and root zone soil water exhibited significant fluctuations influenced by rainfall amount.

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钱龙娇.氧同位素在浑善达克沙地杨树林土壤水分来源研究中的应用[J].江淮水利科技,2023,(3):44-48

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  • 收稿日期:2023-03-07
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  • 在线发布日期: 2023-07-19
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