【摘要】 为研究农田土壤碱解氮的含量及其分布,以东北玉米带不同纬度农田土壤为对象,研究了100cm深度范围内碱解氮含量垂直分布及纬向分异特征。结果表明:土壤碱解氮主要分布在0～60cm土层中,各样点碱解氮含量随土壤深度的增加而减少;除公主岭点外,其它各点0～60cm的3个土层间碱解氮含量差异显著(P<0.05);碱解氮含量与有机碳、全氮含量极显著正相关(P<0.01),说明土壤碱解氮含量及其分布主要受土壤有机质和氮素水平的影响。0～20cm土层碱解氮含量具有随纬度增加而增加的趋势,气候条件和土壤类型的差异是导致其纬向分布差异的主要原因。更多还原

【Abstract】 The vertical distribution and latitudinal differentiation of alkali-hydrolyzed nitrogen in the profile down to 100 cm depth of maize soils in Northeast China was investigated along a latitudinal gradient. The results showed that soil alkali-hydrolyzed N was mainly distributed at the depth of 0—60 cm, and decreased with soil depth. Except for the Gongzhuling site, the soil alkali-hydrolyzed N content in other sampling sites was significantly different (P<0.05) among the 3 layers at the depth of 0—60 cm. Soil alkali-hydrolyzed N had a significant positive correlation (P<0.01) with soil organic carbon and total N, indicating that its content and distribution was mainly affected by soil organic matter and total N levels. Soil alkali-hydrolyzed N content increased with increasing latitude, and climate condition and soil type were considered as the main reasons that induced the latitudinal differentiation of soil alkali-hydrolyzed N.更多还原