Paludalfs under different crop rotation systems in North Huai region,China were sampled and soil aggregates were separated by ultra sonic dispersion followed by sedimentation and centrifuging.The particle size distribution,SOC (Soil organic matter) contents and the natural abundance of 13 C in these aggregates were studied.Significant difference in size of the aggregates and organic carbon storage in the studied soils were found after 5 years of the crop rotation on the soil.SOC was mainly found in 0.02～0.25mm fraction of aggregates in the soils.The aggregates in layers deeper than 35cm became coarse and richer in SOC under corn peanut sweet potato rotation.Young carbon derived from corn tended to be accumulated in the coarse fractions as revealed by heavier stable carbon composition in those aggregates from deep layer under the rotation system containing corn crop.Compared to the soil under think pine forest,All soils under crop rotation system showed rapid increase of SOC at rates ranging from 0.14C g·kg -1 ·a -1 to 0 22C g·kg -1 ·a -1 ,with the highest under corn peanut sweet potato system.Thus,the significance was indicated for increasing SOC storage by crop rotation in paludalfs and for reinforcing terrestrial carbon retention of atmospheric CO 2.
2011中国生物黑炭与绿色农业国际研讨会（International Workshop on Biochar and New Green Agriculture of China）于2011年9月20—23日在南京举行。此次会议经教育部国际合作与交流司（教外司际[20111921号）批准，南京农业大学和国际生物黑炭协会（International Biochar Initiative）共同组织，沈阳农业大学和河南三利新能源有限公司、浙江农业科学院等单位主要资助，上海中科岸达环境科技公司、安徽拜尔福生物科技有限公司等单位共同赞助召开。
