Few studies have been conducted on the factors and distribution of soil organic carbon (SOC) in plantation forests in arid mountainous regions, especially in orchards. We aimed to unravel the SOC distribution among land‐use types and the effects of altitude gradients and rock fragment content (RFC) on SOC accumulation and sequestration in the Upper Min River Arid Valley, China. The differences in SOC distribution among land‐use types were quantified. The correlation analysis of SOC with various factors, such as altitude and RFC, was conducted. The variation percentage in SOC content and stocks was explained by the factors' contribution using mixed‐effects models. SOC distribution was characterized by high content and low stocks in native forests and shrubs, high content and high stocks in eco‐forest, and low content and high stocks in orchards. At the surface (0–30 cm), SOC content and stocks in orchards (cherry, plum, and apple) were significantly lower than those in eco‐forests. There was a significant positive correlation between altitude and SOC content at the surface but not at the subsoil (30–60 cm). With RFC increased, the surface SOC content decreased in native forests, shrubs, and eco‐forests, while it increased in orchards. Our results suggest that land management is the main factor controlling the variation in SOC distribution. Enhancing the surface SOC stability in orchards by land management is a priority for soil carbon pool management in the Arid Valleys.
Qiang religious culture is the result of its adaptation to the natural environment and socio–economic development. The Upper Reaches of Min River has been the main inhabiting district of the Qiang ethnic group in China. Based on the construction of the resource system for Qiang religious culture, this study quantitatively illustrated the cognitive characteristics of this culture in the basin and the main factors influencing its regional differentiation using statistical methods, Moran’s I method, Getis-Ord Gi* method, and the Geo-detector model. The results suggested that the respondents’ cognitive degree (RCD) in relation to the religious culture in the study area was 0.258 ± 0.031, and the cognitive degrees for religious buildings, supplies, literature, and beliefs were as follows: religious literature (0.332) > religious supplies (0.287 ± 0.076) > religious buildings (0.222 ± 0.037) > religious beliefs (0.193 ± 0.023). This result was mainly related to the dissemination methods of religious cultural elements, the status of their preservation, and changes in the production and lifestyle of the people. Furthermore, the respondents’ cognition presented significant regional differentiation characteristics. Two natural factors, namely, humidity and elevation, were the major ones that influenced cognitive regional differentiation with influences values of 0.293 and 0.280, respectively. Elevation and average night light index exhibited significant correlations with cognition (p < 0.05). Meanwhile, the influence was enhanced when various factors interacted with one another. This study contributes to the quantitative research on the sustainable development of the Qiang religious culture and national culture inheritance.
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