Dynamics and driving factors of vegetation carbon sources and sinks in Shanxi Province, China
摘要
Understanding regional vegetation carbon dynamics is vital for ecosystem carbon sequestration evaluation and climate mitigation planning. Focusing on Shanxi Province and its planned mining areas in China, this study investigated the dynamics and drivers of Net Ecosystem Productivity between 2001 and 2020 using soil heterotrophic respiration models, Sen+Mann–Kendall analysis, variation coefficients and Geodetector method. The results indicated that: From 2001 to 2020, Net Ecosystem Productivity in Shanxi Province demonstrated a spatial distribution with elevated levels in the southeast and diminished levels in the northwest. The vegetation collectively functioned as a carbon sink. The ranking of Net Ecosystem Productivity among the three major coal bases is as follows: Jindong>Jinzhong>Jinbei. The NEP in Shanxi Province demonstrated a steady ascent, registering a yearly increase of 7.25 (g C·m−2·a−1). The trends in vegetation Net Ecosystem Productivity within the planned mining areas were generally consistent with those of Shanxi Province as a whole, while the Jinbei Base exhibited values significantly lower than the average for the planned mining areas. The areas showing an upward trend of Net Ecosystem Productivity comprised 91.81% of the study region. Precipitation, land utilization, and population density acted as the key determinants on the spatial layout of carbon sources and sinks. Compared with individual factors, the interactive effects of environmental and human-induced factors provided a more powerful explanation for Net Ecosystem Productivity.