基于样区的野外观察、土壤实测数据和20年气象资料的统计,分析了东北地区内土壤轻组有机质含量的空间分布格局及其与年均温(t)、降雨量(p)、有效积温和p/(t降雨量/年均温)之间的关系。分析了相同水热条件下长期施肥措施对土壤轻组有机碳、氮含量的影响,以及不同水热条件下相同施肥措施间的差异。结果表明:样区内土壤轻组有机碳、氮含量沿纬度呈现南低北高的分布趋势;土壤轻组有机碳、氮与气候因素之间存在极显著的相关性。长期施肥处理表明,在相同水热条件下,合理施肥能提高土壤轻组有机质含量。 Based on the field observations of the plots, the measured data of soils and the data of 20 years of meteorological data, the spatial distribution pattern of soil light fraction organic matter in Northeast China and its correlations with the annual average temperature (t), rainfall (p), effective accumulated temperature And p / (t rainfall / annual average temperature). The effects of long-term fertilization on soil organic carbon and nitrogen under the same hydrothermal conditions were analyzed, and the differences among the same fertilization measures under different hydrothermal conditions were analyzed. The results showed that the contents of soil organic carbon and nitrogen in the soil showed a trend of south to north along the latitude. There was a significant correlation between soil light carbon and nitrogen and climatic factors. Long-term fertilization treatment showed that under the same hydrothermal conditions, reasonable fertilization could increase soil light fraction organic matter content.