PJB-2024-582
Influence of grazing intensity and regime on soil nitrogen fixation dynamics in alpine grasslands
Ali Nawaz
Abstract
One of the main factors contributing to the degradation of grasslands is improper grazing management. Thus, it is essential to evaluate soil properties and soil nitrogen fixation dynamics under varying grazing intensities in order to comprehend the consequences on ecosystem nitrogen cycling and create efficient management methods. Short grazing times with a high animal population alternate with rest intervals in rotational grazing (RG). Short enough high-stock density grazing intervals alternate with rest intervals in rotational grazing (RG). Rotational grazing (RG), as opposed to continuous grazing (CG), increases herbage production and fortifies the resilience of grasslands against intense grazing. However, little is understood about the ways in which grazing modifies certain critical components in alpine grassland ecosystems, such as soil nitrogen, potassium, and phosphorus. In ecosystems with low SNF (symbiotic nitrogen fixation) capacity, ANF (asymbiotic nitrogen-fixing) microorganisms provide the majority of the nitrogen. In the current study, protobacteria was shown to be the predominant ANF phylum in all grasslands. Grassland sowing is currently the main method used to restore the very severely degraded alpine meadows on the Tibetan Plateau. determining how much phosphorus, potassium, and nitrogen are present in an alpine ecosystem's top soil at three different grazing intensities: light, moderate, and heavy. We found that the physical and chemical characteristics of the soil varied significantly. Our findings demonstrated that, although increasing grazing intensities increased soil organic matter, temperature, potassium, phosphorus, and soil nitrogen concentration, grazing method had a major impact on how grazing intensity and regime affected the dynamics of soil nitrogen fixation. On the other hand, a decrease in soil pH and water content resulted from intensifying grazing, and vice versa.
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