PARENT SESSION
Poster Session 24: Agro-Ecology
Wednesday, August 10, 5:00 PM - 6:30 PM, Exhibit Hall 220 A-E, Level 2, Palais des congrès de Montréal
Relationship between water-stable aggregates and soil nutrients in phaeozem after reclamation.
Wantai, Yu*,1, Shanmin, Shen*,, Lu, Zhang*,, Qiang, Ma*,, Shaohua, Zhao*,, 1 Institute of Applied Ecology of Chinese Academy of Sciences, Shenyang, Liaoning, China
ABSTRACT- The phaeozem (Black soil) is a typical soil resource in Northeast China. Water stable aggregates are an index for evaluation of soil structural properties, and they are affected by many factors. Zhaoguang Farm, Longzhen Farm and Jiusan Farm are representative areas of black soil in the region. This study looks at the variation of the content of water-stable aggregates that were >0.25mm, and the relationship between it and soil nutrients in phaeozem after reclamation. The results show that the content of >0.25mm water-stable aggregates is greater in the surface than in the subsurface and changes in the following order: Longzhen Farm > Zhaoguang Farm > Jiusan Farm. The water-stable aggregates decreased gradually from the initial reclamation stage. The > 0.25mm water-stable aggregates correlate with soil organic C, total N and CEC. Trends with total P and available K are consistent, but the relationship is not clear. The results show that organic matter cements the water stable aggregates. Increased decomposition and decreased input of organic matter after reclamation are responsible for the amount of water stable aggregates. Thus, in order to promote soil aggregate structure, N and organic C should be applied.
Key words: water-stable aggregates, nutrients statuses, back soil