Wang Xin-Xin, Fu Jian-Rong, Zou Ping, Chen Wei, Ye Jing, Yu Qiao-Gang, Jiang Li-Na, Wang Qiang
College of Resources and Environmental Science, Nanjing Agricultural University Nanjing 210095, China.
Ying Yong Sheng Tai Xue Bao. 2013 Mar;24(3):719-24.
By the method of physical fractionation of organic matter, this paper studied the distribution characteristics of organic carbon in different particle size aggregates in a paddy soil chronosequence on the south bank of Hangzhou Bay, East China. In the plow layers of the paddy soil chronosequence, micro-aggregates (<0. 25 mm) dominated, and the proportion of large micro-aggregates (0.053-0.25 mm) decreased with increasing rice cultivation year. In the micro-aggregates (<0. 053 mm and 0. 053-0. 25 mm), the organic carbon content increased with increasing rice cultivation time; and in the aggregates (0. 053-2 mm), the ratio of the organic carbon in different particle size fractions to the bulk soil organic carbon increased with decreasing particle size, and the organic carbon mainly distributed in large micro-aggregates (0. 053 -0. 25 mm). With increasing rice cultivation time, soil particulate organic carbon decreased, indicating that the paddy soil with a longer rice cultivation history had a stronger capability of carbon sequestration than the soil with a shorter rice cultivation history, and the early cultivated paddy soil still had great potential for carbon sequestration.
通过有机物质物理分组的方法，本文研究了中国东部杭州湾南岸水稻土时间序列中不同粒径团聚体中有机碳的分布特征。在水稻土时间序列的耕层中，微团聚体（<0.25毫米）占主导地位，大微团聚体（0.053 - 0.25毫米）的比例随水稻种植年限的增加而降低。在微团聚体（<0.053毫米和0.053 - 0.25毫米）中，有机碳含量随水稻种植时间的增加而增加；在团聚体（0.053 - 2毫米）中，不同粒径级分的有机碳与土壤有机碳的比值随粒径减小而增加，且有机碳主要分布在大微团聚体（0.053 - 0.25毫米）中。随着水稻种植时间的增加，土壤颗粒有机碳减少，表明水稻种植历史较长的水稻土比水稻种植历史较短的土壤具有更强的固碳能力，且早期开垦的水稻土仍具有很大的固碳潜力。
