水保所知识产出(1956---)知识库

The distribution of binding agents (i.e., soil organic carbon (SOC) and glomalin-related soil
protein (GRSP)) in soil aggregates was influenced by many factors, such as plant characteristics and soil
properties. However, how these factors affect binding agents and soil aggregate stability along a climatic
gradient remained unclear. We selected the Robinia pseudoacacia L. forests from semi-arid to semi-humid of
the Loess Plateau, China to analyze the plant biomass, soil physical-chemical properties, SOC and GRSP
distribution in different sized soil aggregates. We found that from semi-arid to semi-humid forests: (1) the
proportion of macro-aggregates (>0.250 mm) significantly increased (P<0.05), whereas those of
micro-aggregates (0.250–0.053 mm) and fine materials (<0.053 mm) decreased and soil aggregate stability
was increased; (2) the contents of SOC and GRSP in macro-aggregates and micro-aggregates significantly
increased, and those in fine materials decreased; (3) the contribution of SOC to soil aggregate stability was
greater than those of total GRSP and easily extractable GRSP; (4) soil properties had greater influence on
binding agents than plant biomass; and (5) soil aggregate stability was enhanced by increasing the contents
of SOC and GRSP in macro-aggregates and soil property was the important part during this process.
Climate change from semi-arid to semi-humid forests is important factor for soil structure formation
because of its positive effect on soil aggregates.