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Article

Using Soil Water Stable Isotopes to Investigate Soil Water Movement in a Water Conservation Forest in Hani Terrace

by 1, 1,* and 2
1
College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China
2
State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3520; https://doi.org/10.3390/w12123520
Received: 19 November 2020 / Revised: 10 December 2020 / Accepted: 11 December 2020 / Published: 15 December 2020
(This article belongs to the Section Hydrology and Hydrogeology)
Water conservation forests significantly contribute to the stability of mountain agricultural ecosystems in Hani Terrace. In this study, we analyzed the relationship between the stable isotopic composition of soil water and precipitation to determine the mechanisms of soil water movement in the small watershed of Quanfuzhuang. We observed significant seasonal variations in soil water sources: antecedent precipitation was the dominant supply during the dry season, and current precipitation dominated during the rainy season. The recharge ratio of precipitation to soil water in the grassland was significantly higher than that in the arbor land and shrubland. The influence of water infiltration, old and new soil water mixing, and soil evaporation on the soil water stable isotopes gradually decreased from the surface (0–20 cm) to the deep (60–80 cm) soil. We observed significant seasonal variability in average soil water δ18O in the upper 0–60 cm and lower variability at 60–100 cm. The average soil water δ18O was generally higher in the dry season than in the rainy season. The mixing of old and new water is a continuous and cumulative process that is impacted by soil structure, soil texture, and precipitation events. We therefore identified a significant time delay in soil water supply with increasing soil depth. Moreover, the piston flow of soil water co-occurred with preferential flow, and the latter was the dominant supply during the rainy season. View Full-Text
Keywords: soil water; stable hydrogen and oxygen isotopes; evaporation; water movement; Hani Terrace soil water; stable hydrogen and oxygen isotopes; evaporation; water movement; Hani Terrace
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MDPI and ACS Style

Pu, H.; Song, W.; Wu, J. Using Soil Water Stable Isotopes to Investigate Soil Water Movement in a Water Conservation Forest in Hani Terrace. Water 2020, 12, 3520. https://doi.org/10.3390/w12123520

AMA Style

Pu H, Song W, Wu J. Using Soil Water Stable Isotopes to Investigate Soil Water Movement in a Water Conservation Forest in Hani Terrace. Water. 2020; 12(12):3520. https://doi.org/10.3390/w12123520

Chicago/Turabian Style

Pu, Huimei; Song, Weifeng; Wu, Jinkui. 2020. "Using Soil Water Stable Isotopes to Investigate Soil Water Movement in a Water Conservation Forest in Hani Terrace" Water 12, no. 12: 3520. https://doi.org/10.3390/w12123520

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