Effect of root‐glomalin on soil carbon storage in trees' rhizosphere and interspace of a tropical dry forest

Abstract

Increasing soil organic carbon (SOC) concentration is a desirable aspect of afforestation. Glomalin‐related soil protein (GRSP) is a ubiquitous component of SOC, preferentially produced by arbuscular mycorrhizal fungi (AMF) during symbiotic association with the plant roots. Although the role of AMF in GRSP production is well established, the role of root in GRSP production is not yet clear. Hence, we aimed to assess the glomalin in different tree roots (i.e., glomalin‐related root protein; GRRP) and its influence on GRSP and SOC storage in trees’ rhizosphere and interspace. The experiment was conducted in a tropical dry forest (India) with six native trees (Hardwickia binata, Lagerstroemia parviflora, Diospyros melanoxylon, Terminalia tomentosa, Shorea robusta, and Anogeissus latifolia) and a planted Teak (Tectona grandis). The fine roots (from the rhizosphere) and topsoils (0–15 cm) were collected from the rhizosphere and interspace of each tree. We found GRRP concentration varying between trees, with higher values observed in the roots of native trees than those of Teak. The AMF colonization was positively correlated with GRRP (r2 = 0.88), and GRRP positively correlated with GRSP and SOC. The higher correlation of GRRP was observed with GRSP (r2 = 0.70–0.79) compared with SOC (r2 = 0.56–0.58), while the correlation was much stronger between GRSP and SOC (r2 = 0.91). These results indicate that GRRP influences SOC storage via mediating GRSP concentration. We suggest that GRRP can be used as an indicator for species screening during afforestation with the aim to improve SOC storage on an afforested landscape.

Research Progress and Potential Functions of AMF and GRSP in the Ecological Remediation of Metal Tailings

“…The study by Guo [99] showed that GRSP played an important function in soil carbon pooling. In addition, many experimental studies suggest that GRSP content is positively correlated with soil organic carbon content and is a key component of soil organic carbon [100][101][102]. Kumar et al [103] found a correlation between GRSP and soil organic carbon accumulation in a study on soils in coal mining areas.…”

Distribution Characteristics and Influence Factors of Rhizosphere Glomalin-Related Soil Protein in Three Vegetation Types of Helan Mountain, China

“…These plants are important for windbreak, sand fixation, and landscape, which in turn are important for maintenance and stability of mountain and desert ecosystems. To date, most studies have focused on forests, and farmland ecosystems [10][11][12][13] evaluating only the differences in soil organic carbon and aggregate at different elevations in the Helan Mountains [14]. By contrast, few research have been conducted on GRSP.…”