Characterizing the spatiotemporal dynamics of shallow soil water stable isotopic compositions on a karst hillslope in Southwestern China

Liu, Qin; Wang, Zhihui; Liu, Cong‐Qiang; Espoire, Mikouendanandi; Chen, Xi; Peng, Tao; Zhang, Lin

doi:10.1016/j.jhydrol.2022.127964

Cited by 9 publications

(3 citation statements)

References 71 publications

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“…In this study, it can be assumed that spatial variations in precipitation isotopes within the research area are insignificant. Consequently, the parameter of lc‐excess serves as a suitable means for characterizing soil evapotranspiration (Liu et al, 2022; Xu et al, 2022). Its formula is defined as follows:

lc - excess = δD - a \times δ {}^{18}O - b

where a and b respectively refer to the slope and intercept of the LMWL.…”

Section: Samples and Analysis Methodsmentioning

confidence: 99%

Understanding the soil and plant water hydrological cycle in a typical wetland under harsh natural conditions in the Shigatse area of the Tibetan Plateau

Cong,

Tan,

Shi

et al. 2023

Hydrological Processes

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In cold alpine regions, ecohydrological feedback to climatic anomalies can provide valuable insights into ecosystem functions in the context of alarming climate change projections. However, the role of vegetation in the hydrological cycle of alpine wetlands remains unclear. We used water stable isotopes (δ 18 O and δD) supplemented with δ 13 C to investigate wetland soil isotope distributions and plant water uptake patterns.

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lc - excess = δD - a \times δ {}^{18}O - b

where a and b respectively refer to the slope and intercept of the LMWL.…”

Section: Samples and Analysis Methodsmentioning

confidence: 99%

Understanding the soil and plant water hydrological cycle in a typical wetland under harsh natural conditions in the Shigatse area of the Tibetan Plateau

Cong,

Tan,

Shi

et al. 2023

Hydrological Processes

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“…Soil water stable isotope compositions (SWSI) and soil water content (SWC) are widely used to explain the process of water exchange at the land-atmosphere interface [41]. The values of δ 18 O and δD of the soil water in karstic areas show significant seasonal variation [42].…”

Section: Characteristics Of Isotopic Variationmentioning

confidence: 99%

Water-Use Strategies and Habitat Adaptation of Four Tree Species in Karstic Climax Forest in Maolan

Ding

Yuan

Zhou

et al. 2023

Water

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The technique of stable hydrogen and oxygen isotope tracing has become an important means to study the mechanism of water movement due to its high sensitivity and traceability. In this study, four dominant tree species in the karst forest of Maolan, Guizhou Province, were selected, and their water-use strategies and the mechanism of maintenance of tree species diversity were investigated using the stable hydrogen and oxygen isotope tracing technique. The results show that: (1) The regional precipitation varied evidently with the alternation of seasons, i.e., the values of δD and δ18O in precipitation had a positive bias in spring and a negative bias in summer and autumn. The value of deuterium excess (d-excess) was between 11.67‰ and 31.02‰, with a mean value of 22.98‰. (2) The soil temperature (ST), soil water content (SWC) and precipitation, which have a significant positive correlation, imposed a joint impact on the dynamics of the soil evaporative fractionation. (3) The line-conditioned excess (LC-excess) varied seasonally in different water bodies, i.e., the relative evaporative fractionation of the rhizosphere soil of deciduous tree species was stronger than that of evergreen tree species, and the evaporative fractionation of hydrogen and oxygen isotopes in the leaf water of evergreen tree species was stronger than that of deciduous tree species in spring and summer. However, that of the latter was stronger than that of the former in autumn. (4) The soil water was the most important potential water source for dominant tree species in karst terrain (71%), followed by epikarstic water, which made up an effective supplement (29%). (5) Finally, trees of different life forms and species varied in capacity and proportion in terms of using the potential water sources in different seasons, i.e., deciduous tree species had a greater capacity for using water from potential sources and variable water-use strategies. This may be a major water-limiting mechanism that maintains photosynthesis in the leaves of evergreen tree species (leaves are evergreen and plants continue to grow via photosynthesis) and constrains photosynthesis in deciduous tree species (leaves fall and plants become dormant and stop growing). These results lead to the conclusion that the dominant tree species in karstic forests resist water stress and adjust water-use strategies towards each potential water source to adapt to the harsh karstic habitat through root plasticity and leaf defoliation.

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“…Thicker soil, higher vegetation coverage, soil cover and vegetation litter can also improve soil water retention and water storage capacity [39] and increase field water holding capacity and soil water content, which is conducive to the continuity of spring water flow. The Guanling-Zhenfeng Huajiang study area belongs to the karst plateau canyon with a steep slope (22 • -30 • ), resulting in groundwater infiltration [40,41], and low vegetation coverage leads to poor rainfall interception [42]. Therefore, the karst spring water flow in the study area is 43.91 mL/s (mean), and the cut-off time is longer.…”

Section: Influencing Factors Of the Carbon And Nitrogen Contents Of K...mentioning

confidence: 99%

Temporal and Spatial Variations in Carbon/Nitrogen Output in the Karst Critical Zone and Its Response to the Forest Ecosystem of Karst Desertification Control

Liu

Xiong

et al. 2023

Forests

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Rocky desertification is a common phenomenon in karst areas. Soil carbon and nitrogen storage is of great significance to the formation and evolution of ecosystems. Soil leakage is one of the important indicators in evaluating ecosystem stability. There are few studies on the response of carbon and nitrogen leakage below the surface of karst critical zones to forest ecosystems. The karst springs in the study area of Shibing Heichong, Bijie Salaxi and Guanling-Zhenfeng Huajiang in Guizhou, China, were selected to determine the variation characteristics of carbon and nitrogen content and karst spring outputs and their response to soil leakage. The results showed the following: (1) The content and output of carbon and nitrogen in karst springs in the three study areas showed obvious spatial differences. The carbon and nitrogen output of karst spring water was mainly concentrated in the rainy season. The carbon and nitrogen contents and output of karst springs in the Shibing Heichong study area were higher than those in the Bijie Salaxi and Guanling-Zhenfeng Huajiang study areas. (2) The carbon and nitrogen outputs of karst springs were mainly affected by flow. Land cover and land use in forests affect the carbon and nitrogen contents of karst springs and thus affect the output. (3) The higher the soil leakage of the karst spring was, the higher the carbon and nitrogen output. The leakage of the overlying soil in the Shibing Heichong study area was high, but the soil decline was small, and the stability of the forest ecosystem was relatively good. In summary, a lower degree of rocky desertification results in higher leakage from karst springs and higher risks of soil leakage; however, the ecosystem was relatively stable. Evaluating forest soil carbon and nitrogen loss and ecosystem stability in karst areas through the nutrient output of karst springs is of great significance for the prevention and control of rocky desertification areas.

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Characterizing the spatiotemporal dynamics of shallow soil water stable isotopic compositions on a karst hillslope in Southwestern China

Cited by 9 publications

References 71 publications

Understanding the soil and plant water hydrological cycle in a typical wetland under harsh natural conditions in the Shigatse area of the Tibetan Plateau

Understanding the soil and plant water hydrological cycle in a typical wetland under harsh natural conditions in the Shigatse area of the Tibetan Plateau

Water-Use Strategies and Habitat Adaptation of Four Tree Species in Karstic Climax Forest in Maolan

Temporal and Spatial Variations in Carbon/Nitrogen Output in the Karst Critical Zone and Its Response to the Forest Ecosystem of Karst Desertification Control

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