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Investigation of soil water hydrological process in the permafrost active layer using stable isotopes
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-04-21 , DOI: 10.1002/hyp.13765 Zongjie Li 1 , Jinzhu Ma 1 , Lingling Song 2 , Juan Gui 3 , Jian Xue 3 , Baijuan Zhang 3 , Wende Gao 3 , Zongxing Li 3
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-04-21 , DOI: 10.1002/hyp.13765 Zongjie Li 1 , Jinzhu Ma 1 , Lingling Song 2 , Juan Gui 3 , Jian Xue 3 , Baijuan Zhang 3 , Wende Gao 3 , Zongxing Li 3
Affiliation
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Here, we studied the isotope characteristics and source contributions of soil water in the permafrost active layer by collecting soil samples in July 2018 in Yangtze River basin. Soil moisture and temperature showed decreasing trends from 0–80 cm, and an increasing trend from 80–100 cm. The value of δ18O and δD first increased and then decreased in the soil profile of 0–100 cm; however, d‐excess increased from 0–100 cm. δ18O values became gradually positive from the southwest to northeast of the study area, while d‐excess gradually increased from southeast to northwest. The evaporation water line (EL) was δD = 7.56 δ18O + 1.50 (R2 = 0.90, p < 0.01, n = 96). Due to intense solar radiation and evaporation on the Tibetan Plateau, the elevation did not impact the surface soil. The altitude effect of the soil depths of 0–20 cm was not obvious, but the other soil layers had a significant altitude effect. Soil moisture and temperature were closely related to the stable isotopic composition of soil water. The contribution of precipitation to soil water on the sunny slope was 86%, while the contribution of the shady slope was 84%. However, the contribution of ground ice to soil water on sunny slope was 14% and the shady slope was 16%. The contribution of ground ice to soil water increased with increasing altitude on the sunny slope, but the contribution of ground ice to soil water had no obvious trend on the shady slope.
中文翻译：
利用稳定同位素研究多年冻土活动层土壤水文过程
在这里，我们通过收集长江流域2018年7月的土壤样本研究了多年冻土活性层中土壤水的同位素特征和源贡献。土壤水分和温度从0–80 cm呈下降趋势，从80–100 cm呈上升趋势。δ的值18 O和δD先升高，然后在0-100厘米土壤剖面下降; 但是，d过量从0-100厘米增加。δ 18个O值成为自西南向研究区的东北部逐渐积极，而d过剩逐渐由东南提高到西北。蒸发水管线（EL）为δD= 7.56δ 18 O + 1.50（R 2 = 0.90，p <0.01，n = 96）。由于青藏高原上强烈的太阳辐射和蒸发作用，海拔并未影响表层土壤。0–20 cm的土壤深度对海拔的影响并不明显，但其他土壤层对海拔的影响却很明显。土壤水分和温度与土壤水的稳定同位素组成密切相关。在阳坡上，降水对土壤水分的贡献为86％，在阴坡上，降水的贡献为84％。然而，向阳坡上的地下冰对土壤水的贡献为14％，而荫凉坡为16％。晴天坡上，地下冰对土壤水的贡献随着海拔的升高而增加，但在阴坡上，地下冰对土壤水的贡献没有明显的趋势。
更新日期：2020-04-21
中文翻译：
利用稳定同位素研究多年冻土活动层土壤水文过程
在这里，我们通过收集长江流域2018年7月的土壤样本研究了多年冻土活性层中土壤水的同位素特征和源贡献。土壤水分和温度从0–80 cm呈下降趋势，从80–100 cm呈上升趋势。δ的值18 O和δD先升高，然后在0-100厘米土壤剖面下降; 但是，d过量从0-100厘米增加。δ 18个O值成为自西南向研究区的东北部逐渐积极，而d过剩逐渐由东南提高到西北。蒸发水管线（EL）为δD= 7.56δ 18 O + 1.50（R 2 = 0.90，p <0.01，n = 96）。由于青藏高原上强烈的太阳辐射和蒸发作用，海拔并未影响表层土壤。0–20 cm的土壤深度对海拔的影响并不明显，但其他土壤层对海拔的影响却很明显。土壤水分和温度与土壤水的稳定同位素组成密切相关。在阳坡上，降水对土壤水分的贡献为86％，在阴坡上，降水的贡献为84％。然而，向阳坡上的地下冰对土壤水的贡献为14％，而荫凉坡为16％。晴天坡上，地下冰对土壤水的贡献随着海拔的升高而增加，但在阴坡上，地下冰对土壤水的贡献没有明显的趋势。
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