木兰围场次生天然林演替过程土壤质量指数的评估

ims: Changes in soil physical and chemical properties due to changes in vegetation communities during secondary succession have been a hot topic of research in the field of ecology. However, there is still a lack of in-depth understanding of the pattern of change in soil quality during secondary succession. Methods: Using the method of "space instead of time", three habitats in the Mulan paddock were selected to represent the main successional sequences: white birch forest (EF), mixed birch and larch forest (MF) and larch forest (LF). Soil quality was assessed by calculating the Soil Quality Index (SQI). Results: The study showed that soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), quick-acting nitrogen (AN), quick-acting phosphorus (AP), and maximum water-holding capacity (MWHC) showed a tendency of increasing and then decreasing, and the content of MF was significantly higher than that of EF and LF (p<0.05). bd was lowest in MF, whereas pH was highest in BF, and was significantly higher than that of LF and MF (p<0.05). The results of the minimum dataset (MDS) constructed using AN, TP and pH showed that SQI also showed a tendency of increasing and then decreasing during succession, with MF significantly higher than EF and LF (p<0.05), which was manifested as MF>BF>LF. Conclusion: In summary, SQI showed a trend of first increasing and then decreasing during the successional process. The SQI can be improved by artificial replanting of larch.This study provides a new theoretical basis for revealing the changes of soil quality index during secondary succession.