Full
Outline
In the circumstance of global change, studying the dynamic changes of vegetation and the factors that influence it holds immense practical significance to monitor the quality of the regional ecological environment and improve the structure and function of ecosystems. In this study, the Theil-Sen Median trend analysis along with Mann-Kendal was used to characterize the overall change trend of vegetation ecology across the Yangtze River Delta based on the vegetation ecological quality index (VEQI) time series data (2000~2023). Then, the coefficient variation method was utilized to evaluate the stability in VEQI from 2000 to 2023. The geographic detector model was used to explain the natural and human activities driving mechanism of VEQI change. The results demonstrate that: The overall VEQI values in the Yangtze River Delta area showed a stage upward trend, with an increasing rate of 0.29a-1. The upward trends observed in the VEQI indicated an enhancement in the ecological environment of the investigation area; The area whose VEQI increased was much larger than the area whose VEQI decreased. The area with improved VEQI accounted for 82.61% of the total area while the vegetation degradation areas for only 15.04%. The VEQI of study area owned a better stability, with low and relatively low fluctuation areas accounting for 54.66% and 15.99% of the area, respectively. The VEQI spatial variation primarily affected by a range of variances in natural phenomena and human activities, whereas spatial heterogeneity was mainly driven by factors such as landform type, elevation and slope. The improvement in the explanatory power of anthropogenic factors for spatial heterogeneity when combined with natural factors was significant. The research results aim to offer guidance for the execution of vegetation restoration initiatives and the establishment of policies for the preservation of the ecological environment in the upstream region of the Yangtze River Delta.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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