Abstract
Subsurface-water flow pathways in three different land-use areas (non-irrigated grassland, poplar forest, and irrigated arable land) in the central North China Plain were investigated using oxygen (18O) and hydrogen (2H) isotopes in samples of precipitation, soils, and groundwater. Soil water in the top 10 cm was significantly affected by both evaporation and infiltration. Water at 10–40 cm depth in the grassland and arable land, and 10–60 cm in poplar forest, showed a relatively short residence time, as a substantial proportion of antecedent soil water was mixed with a 92-mm storm infiltration event, whereas below those depths (down to 150 cm), depleted δ18O spikes suggested that some storm water bypassed the shallow soil layers. Significant differences, in soil-water content and δ18O values, within a small area, suggested that the proportion of immobile soil water and water flowing in subsurface pathways varies depending on local vegetation cover, soil characteristics and irrigation applications. Soil-water δ18O values revealed that preferential flow and diffuse flow coexist. Preferential flow was active within the root zone, independent of antecedent soil-water content, in both poplar forest and arable land, whereas diffuse flow was observed in grassland. The depleted δ18O spikes at 20–50 cm depth in the arable land suggested the infiltration of irrigation water during the dry season. Temporal isotopic variations in precipitation were subdued in the shallow groundwater, suggesting more complete mixing of different input waters in the unsaturated zone before reaching the shallow groundwater.
Résumé
Les voies d’écoulement des eaux souterraines ont été étudiées dans trois zones d’occupation des terres différentes (prairies non irriguées, forêt de peupliers et terres arables irriguées) dans la plaine centrale de la Chine septentrionale en utilisant les analyses des isotopes de l’oxygène (18O) et de l’hydrogène (2H) d’échantillons des précipitations, des sols et des eaux souterraines. L’eau du sol dans les 10 premiers cm a été significativement affectée par l’évaporation et l’infiltration. L’eau à une profondeur de 10 à 40 cm dans les prairies herbacées et les terres arables et de 10 à 60 cm dans la forêt de peupliers a montré un temps de séjour relativement court, une grande partie de l’eau du sol initiale étant mélangée à un événement d’infiltration de 92 mm, alors qu’en dessous de ces profondeurs (jusqu’à 150 cm), des pointes appauvries en δ18O suggéraient que de l’eau de pluie contournait les couches de sol peu profondes. Des différences significatives dans la teneur en eau du sol et les valeurs de δ18O dans une petite zone suggèrent que la proportion d’eau immobile du sol et d’eau s’écoulant dans les voies souterraines varie en fonction de la couverture végétale locale, des caractéristiques du sol et du recours à l’irrigation. Les valeurs δ18O de l’eau du sol ont révélé que le flux préférentiel et l’écoulement diffus coexistent. L’écoulement préférentiel était actif au sein de la zone racinaire, indépendamment de la teneur initiale en eau du sol, aussi bien dans les forêts de peupliers que pour les terres arables, alors que l’écoulement diffus était observé dans les prairies de graminées. Les pics de δ18O appauvrie à une profondeur comprise entre 20 et 50 cm pour les terres arables ont suggéré une infiltration de l’eau d’irrigation pendant la saison sèche. Les variations isotopiques au cours du temps des précipitations ont été maîtrisées dans les eaux souterraines superficielles, ce qui suggère un mélange plus complet des différentes eaux d’apport dans la zone non saturée avant d’atteindre les eaux souterraines peu profondes.
Resumen
Se investigaron las trayectorias de flujos subsuperficiales en tres zonas de diferentes usos de la tierra (pastizales no irrigados, bosques de álamo y tierras de cultivo irrigadas) en la llanura central del norte de China utilizando isótopos de oxígeno (18O) e hidrógeno (2H) en muestras de precipitación, suelos y aguas subterráneas. El agua del suelo en los 10 cm superiores fue significativamente afectada por la evaporación y la infiltración. El agua a 10–40 cm de profundidad en el pastizal y tierra cultivable, y a 10–60 cm en el bosque de álamo, mostró un tiempo de residencia relativamente corto, ya que una proporción sustancial de agua antecedente del suelo se mezcló con un evento de infiltración de 92 mm, mientras que por debajo de esas profundidades (hasta 150 cm), los picos de δ18O empobrecidos sugirieron que algunas aguas pluviales evitaron las capas superficiales del suelo. Las diferencias significativas en el contenido de agua del suelo y los valores de δ18O en un área pequeña sugirieron que la proporción de agua y agua del suelo inmóviles que fluyen en las trayectorias subterráneas varía dependiendo de la cobertura vegetal local, características del suelo y aplicaciones de riego. Los valores de δ18O en el agua del suelo revelaron que el flujo preferencial y el flujo difuso coexisten. El flujo preferencial fue activo dentro de la zona de las raíces, independientemente del contenido de agua antecedente, en el suelo tanto en el bosque de álamo como en la tierra cultivable, mientras que el flujo difuso se observó en los pastizales. Los picos de δ18O empobrecidos a 20–50 cm de profundidad en la tierra cultivable sugirieron la infiltración de agua de riego durante la estación seca. Las variaciones isotópicas temporales en la precipitación fueron moderadas en el agua subterránea poco profunda, lo que sugiere una mezcla más completa de diferentes aguas de ingreso en la zona no saturada antes de llegar al agua subterránea poco profunda.
摘要
采用降水、土壤和地下水样品中的氧(18O)和氢(2H)同位素对中国华北平原中部三个不同的土地利用区地表以下水流通道进行了研究。上部10 cm的土壤水受到蒸发和入渗的很大影响。草地和耕地10–40 cm深度的地下水及白杨林地10–60 cm 深度的地下水显示出相对短的滞留时间,因为相当大比例的先前土壤水与92 mm暴雨入渗事件相混合,而在这些深度之下(至150 cm),耗尽的δ18O尖峰信号显示,有些暴雨水绕道浅的土壤层。小区域内的土壤水含量和δ18O值表明,不流动的土壤水和地表之下通道内流动的水的比例根据当地的植被层、土壤特征和灌溉应用情况而发生变化。土壤水δ18O值揭示,优先流和弥散流共存。在白杨林地和耕地中,根系带内优先流活跃,不受先前的土壤水含量支配,而在草地中观测到有弥散流。耕地中20–50 cm深度的耗尽δ18O尖峰信号表明,在干旱季节存在着灌溉水的入渗。降水中时间上同位素变化在浅层地下水中减弱,表明在抵达浅层地下水之前,非饱和带中不同来源的水发生更完全的混合。
Resumo
Foram investigadas as vias de fluxo de água em subsuperfície em três diferentes áreas de uso da terra (pastagem não irrigada, floresta de álamo e terra arável irrigada) no centro da Planície de Norte da China usando isótopos de oxigênio (18O) e hidrogênio (2H) em amostras de precipitação, solos e águas subterrâneas. A água do solo nos 10 cm superiores foi significativamente afetada pela evaporação e infiltração. A água a 10–40 cm de profundidade em pastagens e terra arável, e 10–60 cm na floresta de álamo, mostrou um tempo de residência relativamente curto, uma vez que uma proporção substancial de água do solo existente foi misturada com um evento de infiltração de tempestade de 92 mm, enquanto abaixo dessas profundidades (até 150 cm), picos de decaimento do δ18O sugerem que alguma água de tempestade passava pelas camadas superficiais do solo. Diferenças significativas no teor de água do solo e valores de δ18O em uma pequena área sugerem que a proporção de água imobilizada no solo e de água que flui nas vias de fluxo em subsuperfície varia dependendo da cobertura vegetal local, características do solo e aplicações de irrigação. Os valores δ18O da água e do solo revelaram que o fluxo preferencial e o fluxo difuso coexistem. O fluxo preferencial foi ativo dentro da zona radicular, independente do teor de água do solo pré-existente, tanto na floresta de álamo quanto na terra arável, enquanto que o fluxo difuso foi observado em pastagens. Os picos de decaimento do δ18O a 20–50 cm de profundidade na terra arável sugeriram a infiltração de água de irrigação durante a estação seca. As variações isotópicas temporais na precipitação foram suavizadas nas águas subterrâneas rasas, sugerindo uma mistura mais completa de diferentes águas de entrada na zona não saturada antes de atingir as águas subterrâneas rasas.
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Acknowledgements
This research was fund by the National Basic Research Program of China (2010CB428802) and the National Natural Science Foundation of China (U1403282). The authors would like to thank Randy Bayless, Christine Stumpp, Dongmei Han, and Hongbing Zhan for their valuable discussions and suggestions for this paper. We wish to thank Dan Lin, Siyuan Huo, Changkun Zhu, Yalei Liu and Lan Yang for sampling and laboratory works. We also wish to thank the editor and reviewers for their useful comments and encouragement.
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Ma, B., Liang, X., Liu, S. et al. Evaluation of diffuse and preferential flow pathways of infiltrated precipitation and irrigation using oxygen and hydrogen isotopes. Hydrogeol J 25, 675–688 (2017). https://doi.org/10.1007/s10040-016-1525-5
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DOI: https://doi.org/10.1007/s10040-016-1525-5