Hot-water-soluble Carbon and Surface Properties ofWater Repellent Soils

摘要

Hot-water-extraction of water repellent soils from Australia, Portugal and UK eliminated soil water repellency (SWR) in the soils studied. GC/MS analysis showed that the dominant compounds were aromatic acids, short chain dicarboxylic acids (C4-C9), sugars, short chain fatty acids (C8-C18) and esters of stearic and palmitic acids. Aromatics and fatty acids (< C24) contents increased upon saponification and cleavage of ester bonds of high molecular weight and polar compounds. Specific surface area and pore distribution showed that the sandy loam soils had micropores and adsorbed water more efficiently than the sands. SWR may intensify upon drought. It has an effect upon SOM decomposition and plant productivity, as well as the microbial community structure and the overall carbon balance.