Increased snowfall weakens complementarity of summer water use by different plant functional groups

Chi, Yonggang; Zhou, Lei; Yang, Qingpeng; Li, Shaopeng; Zheng, Shuxia

doi:10.1002/ece3.5058

Cited by 13 publications

(5 citation statements)

References 38 publications

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“…Soil and plant water samples were well described by linear regressions, resulting of laying at an angle to the LMWL, this is consistent with previous studies (Goldsmith et al, 2012;Evaristo et al, 2015;Che, et al, 2019). The slopes and intercepts of these water lines were determined by the relative evaporation rates of the different water isotopes (Crawford et al, 2014;Benettin et al, 2018;Bowen et al, 2018;Chi et al, 2019), indicating the different magnitudes of evaporative enrichment of isotopes in soil water and plant water. The slope and intercept of soil water at the grassland site (5.46 and -8.66, respectively) were slightly lower than those at the shrub site (5.83 and -4.83, respectively), suggesting soil evaporation was slightly greater at the grassland site than at the shrub site.…”

Section: Comparisons Between P Fruticosa Shrub and Alpine Grasslandsupporting

confidence: 89%

Stable isotope analysis of plant water and soil water across two vegetation types in the northern Qinghai-Tibet Plateau

Li¹,

Zhang²,

Du³

et al. 2022

Preprint

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Studying the interrelation of soil water and plant water is essential for an in-depth understanding of eco-hydrological processes. However, water use relationships and comparative studies between shrubs and alpine grassland of the northern Qinghai-Tibet Plateau remain poorly understood. In this study, we compared δ18O and δ2H values of water from soil, plant, precipitation, and groundwater between P. fruticosa shrub and alpine grassland locations at two neighboring sites in order to better understand the interface between plant and surrounding soils of shrubs and grasslands in the northern Qinghai-Tibet Plateau. Our results showed that δ18O and δ2H of soil water, precipitation, and plant water varied significantly over time and water sources in P. fruticosa shrub and alpine grassland sites. Both soil evaporation and plant transpiration at the P. fruticosa shrub site were relatively lower than they were at the alpine grassland site. Alpine grassland plant water had a stronger dynamic fractionation effect in the process of transportation and was more sensitive to environmental conditions. However, plants at the P. fruticosa shrub site displayed more flexible water use patterns, shifted their water sources between shallow soil water and deep soil water. Shrubs from alpine grassland leaded to changes in grassland water use, thereby changing soil water storage. The results of this study will provide theoretical basis for improving the availability and sustainability of soil water, provide guidance for meadow management from ecohydrological processes on the northern Qinghai-Tibet Plateau.

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Section: Comparisons Between P Fruticosa Shrub and Alpine Grasslandsupporting

confidence: 89%

Stable isotope analysis of plant water and soil water across two vegetation types in the northern Qinghai-Tibet Plateau

Li¹,

Zhang²,

Du³

et al. 2022

Preprint

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“…Plant nutrition and nutrient conservation strategies differ between plant species and thus would show different responses to changes in soil resources along the restoration gradient [ 19 ]. For example, shallow roots plant production as that mainly rely on fibrous branched roots to acquire surface soil water and nutrients [ 20 ]. Therefore, a better understanding of the responses of C/N ratio to grazing and mowing is vital to maintaining grassland functionality and sustainability.…”

Section: Introductionmentioning

confidence: 99%

Grazing and Mowing Affect the Carbon-to-Nitrogen Ratio of Plants by Changing the Soil Available Nitrogen Content and Soil Moisture on the Meadow Steppe, China

Wang

Zhang

et al. 2022

Plants

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Common grassland management practices affect plant and soil element stoichiometry, but the primary environmental factors driving variation in plant C/N ratios for different species in different types of grassland management remain poorly understood. We examined the three dominant C/N stoichiometric responses of plants to different land uses (moderate grazing and mowing) in the temperate meadow steppe of northern China. Our results showed that the responses of the C/N ratio of dominant plants differed according to the management practice. The relative abundance of N in plant tissues increased due to increased soil NO3−, with a consequent decrease in plant C: N in the shoots of Leymus chinensis, but the C/N ratio and nitrogen concentration in the shoots of Bromus inermis and Potentilla bifurca were relatively stable under short-term moderate grazing management. Mowing reduced the concentration of soil NH4+, thus reducing the nitrogen concentration of the roots, resulting in a decrease in the root C/N ratio of Potentilla bifurca. Structural equation model (SEM) showed that the root C/N ratio was affected by both root N and soil inorganic N, while shoot C/N ratio was only affected by the soil inorganic N. Our findings provide a mechanistic understanding of the responses of plant C/N ratio to land use change. The species-level responses of plant stoichiometry to human-managed grasslands deserve more attention.

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“…Plants can access shallow and deep soil water, as well as groundwater with a tendency to prioritize the use of stable and continuous water sources (Zhao & Wang, ), at least in regions where some sources are continuously available. Several studies based on an isotope approach and focusing on the identification of different water sources accessed by plants have been conducted at individual sites in many regions of the world and on different plant species (e.g., to name a few recent studies, Allen, Kirchner, Braun, Siegwolf, & Goldsmith, ; Chi, Zhou, Yang, Li, & Zheng, ; Dubbert, Caldeira, Dubbert, & Werner, ; Evaristo et al, ; Nie et al, ; Oerter, Siebert, Bowling, & Bowen, ; Qiu et al, ). Recent meta‐analyses assessed plant water sources across different biomes and plant species (Barbeta & Peñuelas, ; Evaristo, Jasechko, & McDonnell, ; Evaristo & McDonnell, , ).…”

Section: Introductionmentioning

confidence: 99%

Depth distribution of soil water sourced by plants at the global scale: A new direct inference approach

et al. 2020

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The depth distribution of soil water contributions to plant water uptake is poorly known. Here we evaluate the main water sources used by plants at the global scale and the effect of climate and plant groups on water uptake variability and depth distribution. The global meta‐analysis is based on isotope data (δ2H and δ18O) extracted from 65 peer‐reviewed papers published between 1990 and 2017. We applied a new direct inference method to quantify the overlap between xylem water and soil water sources used by plants. The median overlap between xylem water and soil water at different depths varied between 28% and 100%, but they were generally >50%. The shallow (0‐10 cm) soil water overlap with xylem water was largest in cold regions (100% ± 0%) and lowest at tropical sites (about 28%). Conversely, the median overlap between xylem water and deep soil water was largest in the arid and the tropical zones (>75%) and much smaller in the temperate and cold zones. Our results suggest that the isotopic composition of xylem water reflects mostly the signature of shallow soil water (<30 cm) in the cold and the temperate zones, whereas in the arid and the tropical zones, plants appear to exploit water in deeper soil layers. Our novel, simple statistically‐based direct inference method performed well in determining these differences in water sources, and can be applied more widely to isotope‐based plant water uptake studies.

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Increased snowfall weakens complementarity of summer water use by different plant functional groups

Cited by 13 publications

References 38 publications

Stable isotope analysis of plant water and soil water across two vegetation types in the northern Qinghai-Tibet Plateau

Stable isotope analysis of plant water and soil water across two vegetation types in the northern Qinghai-Tibet Plateau

Grazing and Mowing Affect the Carbon-to-Nitrogen Ratio of Plants by Changing the Soil Available Nitrogen Content and Soil Moisture on the Meadow Steppe, China

Depth distribution of soil water sourced by plants at the global scale: A new direct inference approach

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