Forest transpiration in Brazilian drylands: measurement and validation of a hydrological model

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2026-02-01 Epub Date: 2025-12-02 DOI:10.1016/j.jsames.2025.105896

Nazaré Suziane Soares , José Vidal de Figueiredo , Carlos Alexandre Gomes Costa , Italo Sampaio Rodrigues , José Carlos de Araújo

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Abstract

Transpiration, particularly in dryland forests, plays a major role in the water cycle. The one-million km² Caatinga Biome is a data-scarce region in the Brazilian Semiarid, where rainy and dry season are clearly distinct. This work aims to measure the natural Caatinga vegetation transpiration using sap flow monitoring (between Feb 2016 and Dec 2017) and to validate the hydrological Distributed Catchment Scale Model (DiCaSM). Measured transpiration in situ was on overall average 0.58 mm.day⁻¹ for rainy and transition seasons. There is evidence that sap flow does not provide a good representation of transpiration in dry seasons: sap flow is high, whereas, according to the Literature, actual evapotranspiration is negligible (<0.01 mm.day⁻¹) due to a very low soil water content, and, thus, transpiration should also be negligible. Transpiration estimated by DiCaSM presented a well-defined seasonal variability, with values close to zero during the driest months, in agreement to previous literature. Overall, the findings contribute to better expertise regarding the transpiration rates in a dryland environment and may be used in water resources management contexts, as the transpiration process gives insight into local water use and availability.

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巴西旱地的森林蒸腾：水文模型的测量和验证

蒸腾作用，特别是在旱地森林中，在水循环中起着重要作用。100万平方公里的卡廷加生物群落是巴西半干旱地区的一个数据稀缺地区，那里的雨季和旱季明显不同。本研究旨在利用液流监测（2016年2月至2017年12月）测量Caatinga植被的自然蒸腾作用，并验证水文分布式流域尺度模型（DiCaSM）。在雨季和过渡季节，原位测量的蒸腾总体平均为0.58 mm.day−1。有证据表明，液流不能很好地代表旱季的蒸腾作用：液流很高，然而，根据文献，由于土壤含水量非常低，实际蒸散发可以忽略不计（<0.01 mm.day - 1），因此，蒸腾作用也应该可以忽略不计。DiCaSM估算的蒸腾呈现出明确的季节变率，在最干燥的月份，蒸腾值接近于零，这与以前的文献一致。总的来说，这些发现有助于提高旱地环境中蒸腾速率的专业知识，并可用于水资源管理，因为蒸腾过程可以深入了解当地的用水和可用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.