垦殖方式对小叶章湿地表土团聚体有机碳分布的影响

研究了2种垦殖方式对三江平原小叶章湿地表土团聚体及其有机碳分布的影响.结果表明,垦殖后,粒径>0.25mm的大团聚体呈降低趋势,大豆田中0.053~0.25mm微团聚体增加;水稻田中主要增加的是1mm及0.053~0.25mm团聚体有机碳含量降幅均呈现大豆田大于水稻田,水稻田>大豆田,小叶章湿地>大豆田>水稻田.水稻田比大豆田土壤有机碳储量稍高,但其微团聚体有机碳储量及其占土壤有机碳储量的比例低于大豆田,开垦为大豆田比开垦为水稻田有利于土壤有机碳长期存留.

Effect of different reclamation patterns on soil organic carbon distribution of aggregates in the topsoil of the Calamagrostis angustifolia wetland in Sanjiang Plain, China

How reclamation of Calamagrostis angustifolia wetland for soybean and rice farming impacts the SOC distribution of aggregates in the topsoil was investigated. A declining trend of macro-aggregates (>0.25mm) but increasing of micro-aggregates of 0.053~0.25mm in the soybean field and 1mm and 0.053~0.25mm aggregates were lost more in soybean field than in paddy field, but opposite conclusion for paddy field>soybean field while the SOC storage of micro-aggregates (soybean field>paddy field. Compared with soybean field, paddy field contained slightly higher SOC but both the SOC storage of micro-aggregates (<0.25mm) in paddy field and its share in total soil SOC were lower. Therefore, after reclamation, soybean farming was more friendly for sustainable SOC residence in the soils than rice farming.