我国主要农耕区土壤团聚体中有机碳含量特征

The Characteristic of Organic Carbon Content in Soil Aggregates of China's Major Farmland

农田土壤有机碳库变化问题是当前全球变化研究的热点问题之一.选择我国主要农耕区土壤,分析有机碳、总碳和总氮等在不同粒级团聚体中的分布规律.结果表明,在东北地区,如黑龙江中TOC含量较高,土壤有机碳含量与总碳含量关系密切,且均与土壤团聚体有关,土壤团聚体中TOC含量多呈单峰分布,不同直径团聚体中有机碳含量差别明显,0.053 ～0.250 mm直径团聚体中有机碳含量最高,＜0.053 mm团聚体中含量最低.因此,可以选择最佳的农业管理措施来提高农业土壤的固碳能力.

Soil organic carbon change is one of the focuses of global change study. Different types of China＇ s major agricultural soil samples were collected and organic carbon, total carbon and total nitrogen, etc. in different size aggregates were analyzed. The results showed that the Northeast, e.g. Heilongjiang Province, has the higher levels of TOC content. Soil organic carbon content and total carbon content are closely related, which are also related with the soil aggregates. TOC content of soil aggregates mostly showed the distribution mode as single peak. TOC content in soil were significantly different by aggregates size. Aggregate with the diameter of 0. 053 - 0,250 mm has the highest content of organic carbon and aggregates less than 0. 053 mm was the lowest. Therefore, we should choose the best agricultural management measures to improve agricultural soil carbon sequestration capacity.