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中文摘要：
本论文以半湿润地区土垫旱耕人为土（褐土）为供试土样，应用长期通气培养法，研究了湿度和温度对0-90cm土壤剖面不同土层（每30cm为1土层）氮素矿化的影响。每层土壤设11．0、15．0、19．0、23．0、27．0％5个土壤水分等级和8．0、16．0、24．0、32．0、40．0℃5个温度等级，共25个处理，在恒温培养箱中进行培养。培养期间分别在7、14、21、35、49、63和84d取样测定矿化氮累积量。结果表明，不同土层土壤有机氮的矿化累积量均随温度、水分含量升高而增加，各土层增幅的大小顺序为0-30cm〉30-60cm〉60-90cm。0-30cm土层矿化氮是0-90cm土层可矿化氮的主体，其矿化氮占67．9％。不同土层土壤氮素矿化过程不同：在培养期间0-30cm土层氮素矿化量与培养时间符合线性关系，而30-60cm和60-90cm土层符合对数函数；不同土层氮素矿化速率k与含水量w间为直线关系，相关系数r在0.93以上，0-30cm土层的k值对温度反应最为敏感，其次为30-60cm土层，以60-90cm土层反应最小。总体上看，在较高温度培养条件下，随温度增加，土层越深，矿化速率增加越慢；温度和水分对不同土层土壤氮紊矿化具有明显的正交互作用。对0—30cm土层，在高温情况下水分效果更加突出；而对30-60cm和60—190cm土层，温度效应比水分效果更加突出。
英文摘要：
Aerobic incubation experiment was conducted with Eum-Orthic Anthrosols（Cinnamon soils）of sub-humid area to study the effects of temperature and water condition on soil N mineralization of 0-90 cm soil layer which was divided into three layers （each 30 cm thick）. Soil samples were incubated at different temperature of 8.0, 16.0, 24.0, 32.0, 40.0℃ in tubers, and water contents were adjusted to 11.0%, 15.0%, 19.0%, 23.0%, 27.0% （w/w）, sampling 7, 14, 21, 35, 49, 63, 84 days after incubation, respectively. The results showed that N mineralization accumulation quantity of all soil layers increased with the increase of temperature and water content, in the order of 0-30 cm 〉 30- 60 cm 〉 60-90 cm. Mineralizable N of the 0-30 cm soil layer was the major part, which accounted for 67.9 % of total amount in 0-90 cm soil layer. Every soil layer had different mineralization process： mineralization process of 0-30 cm soil layer could be described with linear equation and 30-60 cm and 60-90 cm soil layers with logarithm equation during incubation. Statistical analysis significant correlation was obtained between the soil N mineralization rate （k） and water content （w）, which correlation coefficient was above 0.93. It was found that soil N mineralization rate of 0-30 cm soil layer was most sensitive to temperature, 30-60 cm was less, and 60-90 cm was least. As a whole, under the condition of higher incubation temperature, the N mineralization rate would be shower with the increase of temperature and soil layer depth. Temperature and water content of soil had interactive effects on the quantity and rate of N mineralization. To 0-30 cm soil layer, the positive effect of moisture on N mineralization was more evident than temperature under the higher incubation temperature, while to 30-60 cm and 60-90 era, the effect of temperature was more evident.
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