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Glomalin, produced by arbuscular mycorrhizal (AM) fungi, exists in most soil ecosystem and is quantified as glomalin-related soil protein (GRSP)1,2 which contains two kinds of protein, easily extractable BRSP (EE-BRSP) and total BRSP (T-BRSP). It is reported that GRSP may influence soil fertility due to its complex with 0.048.8% iron,3 remedy soil contamination by sequestering potentially toxic elements, such as Zn, Cu, Cd, Pb4 and alleviate biotic and abiotic stresses.5,6 GRSP has been suggested to be used as biological indicators of soil quality.2 However, as an alkaline-soluble protein material, the production of GRSP is affected by kinds of environmental factors, such as host plant species, and soil amendment and fertilizer, tillage.7,8 The distribution of GRSP in rhizospheric soil has been studied. Guo et al.,9 thought the GRSP contents changed following the soil depth extension, and most of GRSP existed in 0-20cm soil. Vasconcellos et al.,10 found that the concentration of EE-BRSP and T-BRSP were strong related to the ages of recovery after reforestation in the Atlantic forest in Brazil. In general, most documents report the vertical and spatial distribution of GRSP in the soil. However, both the GRSP in vertical and horizontal distribution are important towards plants and land ecological system. To deep understanding the function of GRSP, it is necessary to evaluate the horizontal distribution in soil. Although GRSP concentration was much different in different seasons, it was in tropical forest which was obviously different to terrestrial system.10

Seasonal and Spatial Distribution of Glomalin-Related Soil Protein and Sequestered Metals Affected by AM Fungi in the Citrus Rizosphere