Abstract: The objective of this study was to assess how agroforestry modes affect allocation of soil aggregates (SA), organic carbon (SOC) and microbial biomass carbon (MBC). We measured the contents of the SA, SOC and MBC in three modes: Pinus sylvestris var. mongolica (PS), P. sylvestris var. mongolica-Arachis hypogaea (PA), P. sylvestris var. mongolica-Setaria italica (PH) in Fujia Forest Farm, Northwest Liaoning. The results showed that (1) the aggregate composition was dominated by particles of 0.053-0.25 mm which accounted for 37%-45% of the total under the three modes and the proportion of soil aggregates with particles >0.25 mm was the highest in the PH. (2) The change pattern of organic carbon content in aggregates with aggregate size was significantly different between the two kinds of agroforestry (P<0.05). The distribution of organic carbon contents in soil aggregates with the increase of aggregate size exhibited an “upsidedown N type” for PA and a “N” type for PH. (3) SOC and MBC in the toplayer soil (0-20 cm) of the three modes were in the order of PH > PS > PA. (4) The SOC accumulation was mainly influenced by the contents of aggregates of 0.053-0.25 mm and >2 mm. In addition, MBC was significantly correlated with SOC in 0-50 cm soil layer in the PH, but not in the PA. These results indicate that agroforestry modes can affect MBC and SOC contents.

Key words: poverty type, spatial distribution, multidimensional poverty measurement, poverty-causing factor, poverty level