Contribution of Non-Rainfall Water Input to Surface Soil Moisture in a Tropical Dry Forest

Hydrology

Jacques Carvalho Ribeiro Filho¹  José Bandeira Brasil¹  Marcos Makeison Moreira de Sousa¹  Eunice Maia de Andrade²  Maria Simas Guerreiro³  Helba Araújo de Queiroz Palácio⁴ 

[1] Departamento de Engenharia Agrícola, Campus do Pici, Universidade Federal do Ceará, Fortaleza 60455-760, Brazil;Departmento de Conservação de Solo e Água, Universidade Federal Rural do Semi-Árido, Rua Francisco Mota, 572, Mossoró 59625-900, Brazil;FP-ENAS, FCT, Universidade Fernando Pessoa, Praça 9 Abril, 4249-004 Porto, Portugal;Instituto Federal de Educação, Ciência e Tecnologia do Ceará, Rodovia Iguatu-Várzea Alegre, km 5, Iguatu 63503-790, Brazil;

关键词: semiarid regions;    non-rainfall water input;    water stress;   

DOI  :  10.3390/hydrology9060102

来源: DOAJ

【 摘 要 】

Non-rainfall water input to surface soil moisture is essential to ecosystems, especially in dry climates, where a water deficit may persist for several months. Quantifying the impact of water gains by soil moisture at night will help to understand vegetation dynamics in dry regions. The objective of this study was to evaluate the non-rainfall water contribution to soil moisture content at the soil surface and how it minimizes the water stress on plants with predominantly surface roots. The experiment was conducted in a low-latitude, semiarid environment with a dry tropical forest regenerating for 42 years. The soil moisture and soil temperature were measured at one-minute intervals from June 2019 to August 2019 using four capacitive humidity sensors and thermometers, installed at depths of 5 and 10 cm. the soil moisture increased significantly (p < 0.05) during the night at both depths from June to August, when there was no rainfall. There is a definite contribution of nightly gains to alleviate vegetation water stress during the dry months. These results show the importance of dew for water availability and for dry tropical forests species in the months of water deficit.

【 授权许可】

Unknown