Exploring spatiotemporal dynamics in temporal stability of soil carbon, nitrogen, phosphorus, and pH in Tibetan grasslands

作者：Rang Ding, Yong Qin, Tianyu Li, Gang Fu · 发表于：Geoderma · 年份：2024 · DOI：10.1016/j.geoderma.2024.117062 · 被引用次数：15 · 研究领域：Soil Carbon and Nitrogen Dynamics、Rangeland Management and Livestock Ecology、Forest, Soil, and Plant Ecology in China

• Radiation changes impacted the temporal stability of soil variables. • Temporal stability of soil variables overall decreased but increased locally. • External disturbances caused heterogeneous or homogeneous stability distribution. • Human activities affected more soil stability changes than climate change. Effects of human activities and climate change on temporal stability of terrestrial ecosystems remains controversial. This study explored the spatiotemporal patterns and driving mechanisms of the temporal stability of soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), their ratios (C:N, C:P, N:P), and pH at 0–10 cm, 10–20 cm, and 20–30 cm in the Tibetan grasslands during 2000–2020. Spatially averaged values of relative changes in temporal stability of soil variables ranged from –19.78 % to –6.85 %. In contrast, the relative changes of temporal stability of soil variables were increased for 31.39–45.98 % grassland areas. Climate change dominated changes in the temporal stability of soil variables in 31.50–44.07 % of grassland areas. Meanwhile, human activities predominated changes in 55.35–68.43 % of it. Compared to precipitation change and warming, radiation change had stronger effects on relative changes of temporal stability of SOC, TN, TP, C:N and C:P at 0–10 cm, SOC and TP at 10–20 cm, and TN and C:N at 20–30 cm. Soil variables themselves were not always positively correlated with their temporal stability, and may even be negatively correlated. R...