季节性干燥热带森林（Caatinga）的毁林所造成的能量平衡和蒸散作用：一系列的四个水季

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-03-06 DOI:10.1016/j.jsames.2025.105474

Thieres George Freire da Silva , Maria Gabriela de Queiroz , Sérgio Zolnier , Alexandre Maniçoba da Rosa Ferraz Jardim , Wilma Roberta dos Santos , Magna Soelma Beserra de Moura , Carlos André Alves de Souza , Antonio José Steidle Neto , George do Nascimento Araújo Júnior , Marcelo José da Silva , Kaique Renan da Silva Salvador , Elania Freire da Silva , Luciana Sandra Bastos de Souza

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引用次数: 0

摘要

土地利用变化影响了加廷加地区地表能量平衡组分和蒸散发的时空变化。本研究旨在评估2015 - 2018年巴西半干旱区Caatinga植被区（CAA）和毁林区（DEFA）的潜热通量（LE）和感热通量(H)以及实际蒸散（ET）的能量分配情况。安装了两座微气象塔，以获取雨季、干旱期和过渡期的数据。基于日、月和季节H和LE通量的估算，利用Bowen比值获得能量平衡，后者用于确定ET。CAA景观的净辐射（Rn）、LE、H和土壤热通量(G)的平均值较高，而DEFA记录的平均值最低。CAA和DEFA的日平均ET分别为2.19和1.97 mm。在CAA部位，大约23%的Rn用于LE， 70%用于H， 9%用于G，而在DEFA部位，21%的Rn用于LE， 72%用于H， 8%用于G。我们的研究结果进一步表明，原生植被的移除促进了大气相对湿度、大气相对湿度和蒸散发的降低，并增加了地表水汽压亏缺。在Caatinga植被区，H在旱季的贡献更大，LE在雨季的贡献更大。

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Energy balance and evapotranspiration conditioned by deforestation of a seasonally dry tropical forest (Caatinga): A series of four water seasons

Changes in land use affect the spatial and temporal variations of surface energy balance components and evapotranspiration in the Caatinga. We aimed to assess the partitioning of energy into latent heat flux (LE) and sensible heat flux (H), as well as actual evapotranspiration (ET), in areas of Caatinga vegetation (CAA) and a deforested area (DEFA) in the Brazilian semi-arid region from 2015 to 2018. Two micrometeorological towers were installed to obtain data during the rainy, dry and transition periods. The energy balance was obtained using the Bowen ratio, based on estimates of daily, monthly and seasonal H and LE fluxes, the latter being used to determine the ET. Higher average values of net radiation (Rn), LE, H and soil heat flux (G) were observed for the CAA landscape, while minimum values were recorded in the DEFA. Mean daily the ET in the CAA and DEFA was 2.19 and 1.97 mm, respectively. Around 23% of the received Rn was used for the LE, 70% for H and 9% for G at the site of the CAA, against 21% of the Rn for LE, 72% for H and 8% for G in the DEFA. Our results further showed that the removal of native vegetation promotes reductions in Rn, air relative humidity, ET and increases the vapour pressure deficit in the DEFA. Greater contributions were observed for H in the dry season, with LE being greater during the rainy season in the Caatinga vegetation area.

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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.