Stable isotopes of deep soil water retain long-term evaporation loss on China's Loess Plateau

Xiang, Wei; Cheng, Bing; Li, Min; Li, Han; Lu, Yanwei; Zhao, Ming; Feng, Hao

doi:10.1016/j.scitotenv.2021.147153

Cited by 30 publications

(19 citation statements)

References 68 publications

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“…The soil evaporation loss fraction (f = evaporation/precipitation, %) was calculated based on the soil water balance, ignoring the surface runoff and the steady-state isotope mass balance, with the assumption that the isotope ratio of transpiration was equal to that of the soil water and the lc-excess of the effective input water was set to zero [13]. The soil evaporation loss fraction is calculated using the following equation:…”

Section: Calculations Of Lc-excess and Soil Evaporation Loss Fractionmentioning

confidence: 99%

“…The low r 2 of the multiple linear regression models for 15-20 and 40-45 cm depths (Tables S1 and S2) illustrated that the climate, soil and vegetation variables only partly explained the temporal variation in the lc-excess of soil water at 15-20 and 40-45 cm depths. This may be due to percolation into the subsoil of soil water from shallow horizons with certain evaporative fractionation signals by hydrologic connectivity [13].…”

Section: Capacity Of Lc-excess To Indicate Surface Soil Evaporation Lossmentioning

confidence: 99%

“…The isotopic enrichment of soil water leads to a deviation of the relationship between δD and δ 18 O in soil water from that of precipitation [7]. The primary advantage of the isotope-based method is that the indication corresponds to a relatively long period (e.g., days and months) that occurred before soil sampling, but it does not require continuous field observations [8,12,13]. Field measurement methods, such as direct-measured methods, including micro-lysimeter [14] and chamber technology [15], and indirect-measured methods which are based on ET-partitioning with eddy covariance [16] and chamber techniques [17] and transpiration measurements, such as sapflow soil sampling, but it does not require continuous field observations [8,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The primary advantage of the isotope-based method is that the indication corresponds to a relatively long period (e.g., days and months) that occurred before soil sampling, but it does not require continuous field observations [8,12,13]. Field measurement methods, such as direct-measured methods, including micro-lysimeter [14] and chamber technology [15], and indirect-measured methods which are based on ET-partitioning with eddy covariance [16] and chamber techniques [17] and transpiration measurements, such as sapflow soil sampling, but it does not require continuous field observations [8,12,13]. Field measurement methods, such as direct-measured methods, including micro-lysimeter [14] and chamber technology [15], and indirect-measured methods which are based on ET-partitioning with eddy covariance [16] and chamber techniques [17] and transpiration measurements, such as sapflow techniques [18], estimate soil evaporation at particular points and have relatively short observational timescales [3,9].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Soil Water Stable Isotopes Reveal Surface Soil Evaporation Loss Dynamics in a Subtropical Forest Plantation

Lyu

Wang

2021

Forests

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Line-conditioned excess (lc-excess), the deviation of the relationship between δD and δ18O in soil water from that of precipitation, is often used to indicate soil evaporation loss, but the conditions of using lc-excess under the influences of precipitation infiltration or percolation had not been identified. The interaction effects of climate, soil and vegetation on soil evaporation in forests are not well known. We collected soil water at 0–5, 15–20 and 40–45 cm depths and event-based precipitation from 2011 to 2015 in a subtropical forest plantation and calculated the lc-excess. Precipitation on the sampling day and percolation of upper soil water with low lc-excess affected the capacity of the lc-excess to indicate the soil evaporation fractionation signals. Lc-excess of soil water at 0–5 cm depth indicated a reliable soil evaporation loss estimate over 30 days prior to the sampling day. Soil evaporation loss was dominated by the cumulative soil temperature (Tss) during drought periods and was dominated by the relative soil water content (RSWC) during non-drought periods. High Tss decreased soil evaporation loss by increasing transpiration and relative humidity. Our results emphasize the importance of sampling the upper-most soil layer when there is no rain and vegetation during drought periods in forests when studying soil evaporation loss dynamics.

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Section: Calculations Of Lc-excess and Soil Evaporation Loss Fractionmentioning

confidence: 99%

Section: Capacity Of Lc-excess To Indicate Surface Soil Evaporation Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Soil Water Stable Isotopes Reveal Surface Soil Evaporation Loss Dynamics in a Subtropical Forest Plantation

Lyu

Wang

2021

Forests

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“…Since the 1980s, a growing number of scholars have begun to use stable isotope technology to explore water sources of plants and successfully solved many problems between plants and ecological environment research [17,[22][23][24][25][26], provides an efficient, accurate and low-destructive method for studying different potential plant water sources [27]. Previous studies have shown that, with the exception of a few halophytes [28], isotope composition will not be fractionated when a plant absorbs water through the root system and the water is transported in the plant [29,30]. This finding shows that stable isotopic composition in plant tissue is a comprehensive reflection of different water sources.…”

Section: Introductionmentioning

confidence: 99%

Soil Water Use Strategies of Dominant Tree Species Based on Stable Isotopes in Subtropical Regions, Central China

Zhu

Wang

et al. 2022

Water

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Water is a crucial factor affecting plant growth and ecosystem processes. In the subtropical region, global climate change leads to frequent seasonal droughts. How plant water strategies and the adaptability of forest ecosystems change is an urgent issue to be discussed. In this study, four sample plots (P. massoniana for Plot 1, C. lanceolata for Plot 2, Q. acutissima for Plot 3, C. funebris and I. corallina for Plot 4) were selected in the Taizishan Mountain area of Hubei, China, including three forest types (coniferous forest, broad-leaved forest and coniferous broad-leaved mixed forest) and five dominant tree species. The δD and δ18O isotope compositions in plant and soil water were analysed, and the water use strategies of dominant species were predicted by using the MixSIAR model. The water absorption depth and proportion of the five species were significantly different in different seasons. In plot 4, I. corallina and C. funebris derived (58.8 ± 14.0% and 55.7 ± 23.4%, respectively) water from 10–40 cm soil in wet season, but C. funebris shifted to derive water from deep soil in dry season. This result indicates that the mixing of C. funebris and I. corallina can effectively prevent water competition in dry season with water deficit. From wet season to dry season, the depth of water utilisation of the P. massoniana, C. lanceolata, Q. acutissima and C. funebris with deep roots converted from shallow to deep soil, suggesting that the four species had significant dimorphic root systems and strong ecological plasticity.

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Evapotranspiration variation of soil‐plant‐atmosphere continuum in subalpine scrubland of Qilian Mountains in China

Yu,

Jia,

Zhang

et al. 2024

Hydrological Processes

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The water cycle in the soil‐plant‐atmosphere continuum is an important element of hydrological and ecological studies, and differences in the composition characteristics of hydrogen and oxygen stable isotopes in different water bodies can indicate water cycling processes. In this study, hydrogen and oxygen isotopes of precipitation, soil water and plant water samples had been collected in the subalpine scrubland of the Qilian Mountains from May to October 2019. The Craig‐Gordon model, the isotopic steady‐state (ISS) assumption, the Keeling Plot model and the two‐source mixing model were used to analyse the stable isotope compositions of different water bodies, the stable isotope characteristics of water vapour of soil evaporation and plant transpiration and the variation of evapotranspiration in the SPAC of the subalpine scrubland. The results showed that plant transpiration (FT) contributed 87.28% and 86.95% to evapotranspiration and soil evaporation (FE) contributed 12.72% and 13.05% to evapotranspiration in the growing season on semi‐sunny and semi‐shaded aspects, respectively, indicating that evapotranspiration in the subalpine scrubland mainly came from the transpiration of scrubland plants. In the early of the growing season (May–June), due to the rapid expansion of plant leaves, the contribution of transpiration to evapotranspiration was at a high level, which intensified transpiration and led to a gradual increase of the transpiration contribution. In the middle of the growing season (July–August), owing to better conditions of rain and heat that made plants grow vigorously, plant transpiration made the highest contribution to evapotranspiration more than 90%, which caused to an overwhelming contribution of plant transpiration to evapotranspiration. In the later of growing season (September to October), the contribution of plant transpiration to evapotranspiration decreased significantly while that of soil evaporation increased, which was because plant photosynthesis and respiration gradually declined for losing their leaves of scrub plants and the relative atmospheric humidity was lower.

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Stable isotopes of deep soil water retain long-term evaporation loss on China's Loess Plateau

Cited by 30 publications

References 68 publications

Soil Water Stable Isotopes Reveal Surface Soil Evaporation Loss Dynamics in a Subtropical Forest Plantation

Soil Water Stable Isotopes Reveal Surface Soil Evaporation Loss Dynamics in a Subtropical Forest Plantation

Soil Water Use Strategies of Dominant Tree Species Based on Stable Isotopes in Subtropical Regions, Central China

Evapotranspiration variation of soil‐plant‐atmosphere continuum in subalpine scrubland of Qilian Mountains in China

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