因烧垦而引起的土地利用变化仍然是碳素释放的主要来源 ,从而导致了土壤有机碳含量下降和土壤质量退化。根据该领域的一些研究结果及近年来研究进展 ,概述了开垦对农业生态系统土壤有机碳动态变化的影响 ,提出了今后我国黑土地区的研究方向。表 2 ,参 2 3 Changes in land use due to land reclamation continue to be the major source of carbon emissions, resulting in decreased soil organic carbon content and soil quality degradation. According to the results of some researches in this field and the research progress in recent years, the impacts of reclamation on the dynamic changes of soil organic carbon in agroecosystems are summarized, and the future research directions of black soil in China are proposed. Table 2, reference 2 3