Our results showed that compared with undisturbed soils, soils under the disturbed use dramatically depleted in SOC, particulate OC (POC), non-particulate OC (NPOC), GRSP, easily extractable GRSP (EE-GRSP) and difficulty extractable GRSP (DE-GRSP).
Further, a linear correlation was found among the fractions of GRSP and SOC, and in turn resulted in the similar relationship with soils bulk density, porosity, pH, available phosphorus, total phosphorus, organic nitrogen's, cations (calcium and potassium), arbuscular mycorrhizal (AM) abundance, and with microbial activity.
Besides AMF could release glomalin-related soil protein (GRSP) into soils, which could improve soil structure and improve water retention of rhizosphere (Bedini et al. 2009; Matthiasc et al. 2010).
GRSP is currently involved in a variety of projects in 10 countries.
These results indicate that the factors involve in SOC accumulation simultaneously encourage AM proliferation and in turn GRSP enrichment.
For example, in Bangalore, India, GRSP has created partnerships to launch an anti drunk driving campaign and to improve roadways in high-traffic areas to enhance safety.
We suggest that the fraction of Al extracted by oxalate from solid phase (AlOxa-Cu-K) and the glomalin-related soil proteins (GRSPs) are involved in the accumulation of carbon within water stable aggregates, probably through the formation of non-toxic stable Al-OM compounds, including those formed with GRSPs.
Glomalin-related soil proteins (GRSP) are glycoproteins abundantly produced by arbuscular mycorrhizal fungi in roots and soil.
GRSP concentration was 2.1 - 2.7 mg g-1 in the former ploughed horizons of soils being 55, 100, and 170 years under self-restoration whereas it was 1.9 - 3.2 mg g-1 in the Ah, Ap horizons of the 3 and 20 years' soils under self-restoration.
Most research on glomalin-related soil proteins (GRSP) has focused on the role of arbuscular mycorrhizal fungi in soil aggregation and environmental engineering.
