High‐resolution temporal dynamics of intra‐storm isotopic composition of stemflow and throughfall in a Mediterranean Scots pine forest

Pinos, Juan; Llorens, Pilar; Latron, Jérôme

doi:10.1002/hyp.14641

Cited by 6 publications

(15 citation statements)

References 49 publications

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“…Inorganic N and S deposition can enrich stemflow as well (Butler and Likens, 1995). Opportunities likely exist for stemflow signals to inform us regarding canopy water balances (isotopically: Allen et al, 2017;Pinos et al, 2022), the trapping and recycling of particulate aerosols (through its abiotic and biotic particulate matter content: Ponette-González, 2021), and the balance of canopy soils, where present (also through its particulate matter content).…”

Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

“…Thus, stemflow (and throughfall) isotopic signals may aid in improving our understanding of the mechanisms driving evaporation and routing of precipitation in canopies. For example, recent results from within-storm monitoring of stemflow isotopic signals suggest that, since stemflow has longer residence times within the canopy than throughfall, it may yield strong inferences into the role of evaporation in fractionation (Pinos et al, 2022).…”

Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

“…Since the available evidence currently suggests that various types of epiphytes may rely on canopy soil nutrient stocks (Matson et al, 2014;Gotsch et al, 2016;Victoriano-Romero et al, 2020), the monitoring of stemflow particulate chemistry may signal certain nutrient limitations for members of epiphyte communities. Especially scant observations exist on the particulate matter and isotopic signals in stemflow ( Van Stan et al, 2021;Pinos et al, 2022); however, there appears to be significant potential for these kinds of data to yield insights into canopy biogeochemical processes.…”

Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

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Conceptual analysis: What signals might plant canopies send via stemflow?

et al. 2022

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As watersheds are complex systems that are difficult to directly study, the streams that drain them are often sampled to search for watershed “signals.” These signals include the presence and/or abundance of isotopes, types of sediment, organisms (including pathogens), chemical compounds associated with ephemeral biogeochemical processes or anthropogenic impacts, and so on. Just like watersheds can send signals via the streams that drain from them, we present a conceptual analysis that suggests plant canopies (equally complex and hard-to-study systems) may send similar signals via the precipitation that drains down their stems (stemflow). For large, tall, hard-to-access tree canopies, this portion of precipitation may be modest, often <2%; however, stemflow waters, like stream waters, scour a large drainage network which may allow stemflow to pick up various signals from various processes within and surrounding canopies. This paper discusses some of the signals that the canopy environment may impart to stemflow and their relevance to our understanding of vegetated ecosystems. Being a conceptual analysis, some examples have been observed; most are hypothetical. These include signals from on-canopy biogeochemical processes, seasonal epi-faunal activities, pathogenic impacts, and the physiological activities of the canopy itself. Given stemflow's currently limited empirical hydrological, ecological and biogeochemical relevance to date (mostly due to its modest fraction in most forest water cycles), future work on the possible “signals in stemflow” may also motivate more natural scientists and, perhaps some applied researchers, to rigorously monitor this oft-ignored water flux.

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Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

Section: Signals From Biogeochemical Processesmentioning

confidence: 99%

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Conceptual analysis: What signals might plant canopies send via stemflow?

et al. 2022

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“…While throughfall amounts are well correlated to canopy structure, the isotopic composition of throughfall is not (Hsueh et al, 2016); thus, other, temporally varying controls are more important. Previous studies found that the isotopic offset between precipitation, throughfall and stemflow varies between seasons (Pinos et al, 2022) and also varies with rainfall characteristics, such as rainfall amount (Allen et al, 2015), duration (Liu et al, 2008), intensity (Dewalle & Swistock, 1994), and drop size (Pinos et al, 2020). While throughfall offsets have been widely reported, stemflow offsets have been less investigated (Allen et al, 2020;Pinos et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies found that the isotopic offset between precipitation, throughfall and stemflow varies between seasons (Pinos et al, 2022) and also varies with rainfall characteristics, such as rainfall amount (Allen et al, 2015), duration (Liu et al, 2008), intensity (Dewalle & Swistock, 1994), and drop size (Pinos et al, 2020). While throughfall offsets have been widely reported, stemflow offsets have been less investigated (Allen et al, 2020;Pinos et al, 2022). This is most likely due to the fact that stemflow typically occurs in small volumes (<2% of total incoming precipitation); nevertheless it can still contribute water and nutrients to the subsurface around tree stems (Carlyle-Moses & Gash, 2011;Snelgrove et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Isotopic offsets in throughfall and stemflow may have small effects on estimates of winter precipitation fractions

Floriancic,

Kirchner

2024

Hydrological Processes

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Forest canopies alter the amount and isotopic composition of precipitation reaching the forest floor. Thus retention, evaporation and transport processes in forest canopies, and their effects on water isotopes, are key to understanding forest water cycling. Using a two‐year isotope dataset from a mixed beech/spruce forest in Zurich, Switzerland, we assessed the isotopic offsets between precipitation, throughfall and stemflow. We also analysed how these offsets affect estimates of the fraction of soil water that is derived from winter precipitation. Throughfall was typically enriched in heavy isotopes compared to precipitation, but isotopically lighter than stemflow, with average δ2H of −64.3 ‰, −59.9 ‰ and − 56.3 ‰ in precipitation, throughfall and stemflow, respectively. The differences between beech and spruce were rather small compared to the seasonal differences in precipitation isotopes. Isotopic offsets between precipitation and throughfall/stemflow were smaller during the spring and summer months (March through August) than during fall and winter (September through February). Bulk and mobile soil waters at 10 and 40 cm showed smaller seasonal variations than those in precipitation, throughfall and stemflow, and were isotopically lighter than recent precipitation, with the largest offsets occurring during the summer months (June through August) for bulk soil waters. Thus, bulk soil waters at both depths contain a mixture of precipitation from previous events and seasons, with over‐representation of isotopically lighter winter precipitation. Mobile soil waters were more similar to recent precipitation than bulk soil waters were. Throughfall isotopes were slightly heavier than precipitation isotopes, resulting in different sinusoidal fits for seasonal isotopic cycles in precipitation and throughfall. These differences lead to small underestimates in the fraction of soil water originating from winter precipitation, when open‐field precipitation rather than throughfall is used as the input data. Together our results highlight the importance of isotope measurements in throughfall and stemflow for the assessment of precipitation seasonality and water cycling across forested landscapes.

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Contrasting effects of low-severity fire on stemflow production between coexisting pine and oak trees

Qi²,

Zhuang³

et al. 2023

Science of The Total Environment

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High‐resolution temporal dynamics of intra‐storm isotopic composition of stemflow and throughfall in a Mediterranean Scots pine forest

Cited by 6 publications

References 49 publications

Conceptual analysis: What signals might plant canopies send via stemflow?

Conceptual analysis: What signals might plant canopies send via stemflow?

Isotopic offsets in throughfall and stemflow may have small effects on estimates of winter precipitation fractions

Contrasting effects of low-severity fire on stemflow production between coexisting pine and oak trees

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