Enhancements of soil priming effect and carbon sequestration in degraded alpine meadows via supplementation: a comparative study of Tibetan sheep (Ovis aries) and plateau pika (Ochotona curzoniae) excrements

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: Jan. 2, 2025

Abstract Background Grassland degradation decreases the capacity of soil carbon sequestration, while supplementation exogenous organic matter enhances priming effect (PE) and affects cycle in soil. The excrements Tibetan sheep ( Ovis aries ) plateau pika Ochotona curzoniae play an important role cycling. Therefore, they were used to enrich alpine meadow soils degraded different levels after incubation at 20 °C for up 45 days. PE was analyzed using natural 13 C isotope tracer method relation properties. Results two kinds excrement significantly increased accumulation sequestration. Of two, achieved a better effect. Compared with non-degraded soil, severely had PE, but lightly moderately not from each other. Structural equation modelling shows that total nitrogen (TN), (SOC), β-1,4-N-acetylaminoglucosidase (NAG), β-1,4-glucosidase (βG), pH, microbial biomass (MBC) are main factors affecting PE. In particular, TN directly negatively affected SOC NO 3 − -N:NH 4 + -N ratio indirectly by enzyme activity MBC. Conclusions This study demonstrates supplement animal can improve extracellular content soils, which is conducive net balance. Supplementation both effectively enhance further increase activity, fertility sequestration ability seriously higher than those excrement, promote meadows. findings this provide theoretical evidence rational utilization degradation.

Language: Английский

Effects of Patchiness on Soil Properties and Degradation of Alpine Meadow on the Qinghai–Tibetan Plateau

Land, Journal Year: 2024, Volume and Issue: 13(10), P. 1556 - 1556

Published: Sept. 25, 2024

Patchiness is known to affect soil water and temperature, may trigger or accelerate alpine meadow degradation. However, there a lack of direct evidence concerning the role size type patches on conditions. Here, we estimated effects typical patch types critical factors temperature through an in situ survey then analyzed potential impacts patchiness The results showed that (1) storage (SWS) was remarkably different, vegetation had higher SWS than bare patches; (2) with abundant precipitation, isolated (IV) original (OV), accompanied by decrease surrounding medium (MP); (3) significantly altered surface IV having highest (ST), followed OV (4) maximum mean value evapotranspiration observed (3.85 mm/day), about 12.78% 46.66% OV. Our findings indicated intensified heterogeneity temperature. could absorb from MP for excessive constant high ST, potentially inducing aggravating Increasing connectivity preventing transition important stability restoration meadow.

Language: Английский