东北农区是我国重要的玉米主产区，受长期玉米连作种植影响，土壤有机碳流失严重。近年来东北地区玉米带状间作种植面积不断扩大，但有关新模式下土壤有机碳转化过程及其机制的研究仍有待深入。为此，本项目以东北地区为研究区域，以玉米与大豆、春小麦、马铃薯等作物的不同带状间作模式为研究对象，采用区域田间调研、大田定位监测以及室内土壤培养等方法，运用土壤有机碳物理化学分组，δ13C自然丰度法、静态箱-气相色谱法等技术，分析玉米带状间作模式下土壤有机碳组分构成及其稳定性的变化特征；揭示根际沉积碳、根茬碳等对土壤机碳固定的贡献；探明不同种植模式下土壤矿化特征及其差异；明确不同种植模式下土壤碳排放特征及其环境效应；综合上述研究，分析玉米带状间作模式对土壤有机碳转化过程的影响及其物理化学机制。本研究可为深入认识农田碳循环过程、优化东北玉米种植模式、提升农田综合功能提供理论支撑。

Northeast China is one of the most important corn production areas in China. However, the soil organic carbon losses seriously due to long-term continuous corn cropping in the region. In recent years, the corn-based strip intercropping patterns are continuously expanding in Northeast China. It is imperative to evaluate the soil organic carbon conversion process and its regulatory mechanism under new cropping patterns. Therefore, the present project focuses on the corn-based intercropping patterns, by means of regional field investigation, field experiment in situ, and laboratory experiment to evaluate, 1) dynamic of soil organic carbon and different stability fractions; 2) contributions of crop roots and rhizosphere decomposition carbon on soil organic carbon sequestration and its physical and chemical protection mechanism; 3) characters and differences in soil decomposition; 4) characters and environmental effects of carbon emissions; and 5) to evaluate the soil organic carbon conversion process and its regulatory mechanism under corn-based strip intercropping patterns. This research will provide theoretical support for understanding carbon cycling in agro-ecosystems, optimizing corn cropping patterns in Northeast China, and enhancing the comprehensive function of farmland.