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Abstract
Water repellent layer (WRL) in the Casuarina plantation near Taichung harbor in Central Taiwan is mainly due to the development of filamentous fungi. Not only are hyphae of the isolated fungi, the metabolites of fungi strongly hydrophobic, TCHC-5 and TCHC-20 are also significantly hydrophobic. Humic substances decrease the phosphorus fixation and contribute to the formation of WRL. The hydrophobic properties of humic substances are unfavorable for the nutrient cycling at this area. Wetting angles of fulvic acids and humic acids are pH-dependent. Increasing solution pH reduces hydrophobic strength for fulvic acids and/or humic acids. Isolated fungiTCHC-15 and TCHC- 16 exude strongly acidic metabolites (pH2.7-3.0), which will increase the hydrophobic strength of soil layers. Humic substances with aliphatic chain are the main components that form WRL in soils. Soil pH could be an indicator of hydrophobic potential for organic matter.
Parent Publication
Citation
Lin, Chao-Yuan. 2000. Water repellency of Casuarina (Casuarina equisetifolia Forest.) windbreaks in central Taiwan. In: Ffolliott, Peter F.; Baker Jr., Malchus B.; Edminster, Carleton B.; Dillon, Madelyn C.; Mora, Karen L., tech. coords. Land Stewardship in the 21st Century: The Contributions of Watershed Management; 2000 March 13-16; Tucson, AZ. Proc. RMRS-P-13. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 346-348.
