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19. Thick roots and less microaggregates improve hydrological connectivity

Author

Zhang Zhenming, Liu Ying, Xie Lumeng, Zhao Shiqiang, Dai Liyi, and Zhang Yinghu

Subjects
Delta, China, Environmental Engineering, Health, Toxicology and Mutagenesis, 0208 environmental biotechnology, Wetland, 02 engineering and technology, 010501 environmental sciences, Positive correlation, 01 natural sciences, Preliminary analysis, Soil, Rivers, Environmental Chemistry, Humans, 0105 earth and related environmental sciences, Hydrology, Biomass (ecology), geography, geography.geographical_feature_category, River delta, Global warming, Public Health, Environmental and Occupational Health, General Medicine, General Chemistry, Pollution, 020801 environmental engineering, Wetlands, Environmental science
Abstract

Due to human activity and global climate change, the Yellow River Delta, the youngest delta wetland in China, is suffering serious degradation. The study of hydrological connection provides new perspectives and technical support for the protection and restoration of delta wetlands. To quantify the interaction between the hydrological connection and the root–soil complex, the current study took dye-tracing experiments to examine the small-scale hydrological connectivity in soil where Phramites australis grew. The dye coverage was selected as the indicator of hydrological connectivity after preliminary analysis in this study. The main results were that (1) the strength of hydrological connectivity was negatively related to the microaggregates content, but had little to do with other soil physical properties; (2) there was a notable positive correlation between the indexes of thick root (D > 5 mm) and the dye coverage hydrological connectivity, while root biomass had little effect on hydrological connectivity; and (3) the influence of the microaggregate content dominated in the combined effect of the total surface area of the root (D > 5 mm) and the microaggregate content on hydrological connectivity in each soil layer.

Published
2020

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