关键词: 氨基糖, 矿化, 葡萄糖, 氮添加, 黑土, 水氮互作, 微量注射灌溉, 水分利用效率, 氮肥利用率, 旱砂田

Abstract: By the method of intermittent leaching aerobic incubation, this paper studied the mineralization of three kinds of microbes-derived amino sugar (glucosamine, muramic acid, and galactosamine) in black soil of Northeast China, and the responses to glucose addition and glucose plus nitrogen amendment. The mineralization of the amino sugars was compound-specific. During incubation period, the content of muramic acid decreased by 25.4%, while that of glucosamine decreased by 7.1%, suggesting that bacteria-derived muramic acid was more inclined to be mineralized, compared with fungi-originated glucosamine. However, the mineralized amount of glucosamine (68.4 mg·kg^-1) was greater than that of muramic acid (15.4 mg·kg^-1). Both glucose addition and glucose plus nitrogen amendment improved the contents of glucosamine and muramicacid significantly, but the effect varied. The mineralization of galactosamine was much slower, and less affected by exogenous substances addition, indicating that galactosamine was more stable in test soil.

Key words: amino sugar, mineralization, glucose, nitrogen supply, black soil, water-nitrogen interaction, microjet irrigation, water use efficiency, nitrogen use efficiency, gravel-mulched field.