Glomalin-Related Soil Protein Content in Areas of Degraded and Revegetated Caatinga in the Municipality of Irauçuba

Abstract

Anthropic activities, combined with the natural ones, may trigger soil degradation, which has increased day by day and contributed to accentuating the desertification processes, resulting in losses of biodiversity and fertility of the soils. Because of that, the utilization of tools that indicate the stages of such degradation and recovery becomes necessary, in order to make viable and adequate management of these areas. Thus, the study on arbuscular mycorrhizal fungi (AMF), as a perspective to facilitate the recovery of degraded areas has increased, especially for the production of glomalin-related soil protein, which is of great importance for aggregate stability, besides showing a great potential of utilization as soil quality indicator. Therefore, the present study aimed to evaluate the contents of glomalin-related soil protein, correlating with chemical, physical and biological attributes in areas of the municipality of Irauçuba-CE: area degraded by overgrazing, area under process of natural revegetation managed with the exclusion of domestic animals and area of native forest, characterized by tree-shrub Caatinga vegetation. Disturbed soil samples were collected in the layer of 0-10 cm in each area and evaluated for AMF attributes, soil chemical attributes and physical attributes. The results obtained with the tests of means prove that, among the three areas, only the native forest showed significant differences with respect to both fractions of the protein. However, in regard to spore density and aggregate stability, the areas of native forest and exclusion showed the best mean values. The content glomalin-related soil protein (GRPS), associated with other edaphic attributes, contributes to discriminating the quality and to the monitoring of areas with different levels of soil degradation. The highest correlation values were observed among the contents of calcium, nitrogen and organic carbon and both GRSP fractions (easily extractable: GRSPEE,which represents the recently deposited frsction that has not yet suffered biochemical alterations in the soil; total: GRSPT, which is strongly adhered to the clays), indicating that the protein directly influences the contents of these elements in the soil.

Soil attributes as indicators of the stabilization process of erosion in gullies at different formation stages in the southeast region of Brazil

“…This is possibly related to greater stability of erosive processes in SG, in addition to the positive effect of natural regeneration on enzymatic activity in SG. Silva et al (2018) emphasized that the quantity and the quality of substrate added to the soil was important for increasing 9…”

“…This allows for greater incorporation of organic matter, soil protection (physical barrier) against erosive processes, and increased stimulation of microbial activity. The enzymatic activity has been considered a good indicator of soil quality, reflecting the degree of quality achieved by a solo in the rehabilitation process (Silva et al, 2018). For all enzymes evaluated, there were strong positive correlations (r > 0.80, p < 0.01) with TOC and POXC.…”

Management of natural pasture increases native and exotic herbaceous biomass and biodiversity in the Caatinga of Brazil

“…Another factor is the protection generated for the soil against climatic adversities. Removal of pre-existing vegetation in semi-arid regions reduces soil porosity and density, leading to impaired soil water infiltration, which compromises the appearance of native species (SILVA et al, 2018). Identification number were given to the species according to the alphabetical order of their family in Table 1 (N°).…”

“…However, in the last few years it has been one of the main causes of environmental degradation in these areas in the world (LIMA et al, 2017). In the Caatinga, livestock production has been the leading cause of the extinction of native species, as it causes erosion, compaction, and diminished infiltration of water into the soil, and also contributes to the rural exodus (SILVA et al, 2018). As increasingly smaller and less productive areas remain available to farmers, the use of forage resources by them has been put under greater pressure, and without sustainable options deforestation has been used more and more intensively to provide for their forage needs (MENDES et al, 2013).…”

Teores De Cádmio E Chumbo Em Solos De Áreas De Produção De Lúpulo Na Região Serrana Do Rio De Janeiro

“…A erosão hídrica global causa a perda anual de bilhões de toneladas de solo (WOLKA et al, 2021;BORRELLI et al, 2017). Essa erosão carrega nutrientes e sedimentos para os corpos d'água, impactando a saúde e o meio ambiente (SILVA et al, 2018;CUNHA et al, 2016).…”