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Objective This study explores the spatiotemporal dynamics of vegetation net ecosystem productivity （NEP） and identifies its key driving factors in typical karst regions， providing a theoretical basis for the scientific understanding of carbon cycling mechanisms and the formulation of differentiated carbon neutrality strategies. Methods Vegetation NEP in Guizhou Province from 2000 to 2020 was quantitatively assessed based on an improved Carnegie-Ames-Stanford Approach （CASA） model and an empirical equation for soil microbial respiration. Theil-Sen Median trend analysis， Mann-Kendall significance test， Hurst index， and optimal parameters-based geographical detector were applied to systematically analyze the spatiotemporal variation trends， characteristics， and key driving factors of vegetation NEP in Guizhou. Results 1） During the study period， NEP across Guizhou increased significantly， indicating a continuous enhancement of carbon sequestration capacity. Spatially， NEP decreased from the south-central and southwestern regions to the northern and eastern regions. Vegetation NEP in karst regions ［278.20 g/（m2·a）（based on C）］ was significantly lower than that in non-karst regions ［326.83 g/（m2·a）（based on C）］， suggesting that differences in geological background were the core reason for divergence in carbon sequestration potential. 2） Across the province， changes in NEP mainly remained stable （50.31%） or showed an increasing trend （46.98%）. Increasing trends were concentrated in the western and northeastern regions， while decreasing trends were distributed in the central and eastern regions. Mean Hurst index was 0.48， and areas with Hurst index below 0.5 accounted for 61.59%. 3） Lithology （q=0.41）， as the core natural background factor， directly determined basic habitat conditions such as soil development， water retention， and nutrient conservation， while sunshine duration （q=0.35） was the key meteorological factor. Together， they established the inherent carbon sequestration potential of the region. The interactive effects of multiple factors were stronger than those of single factors. Notably， the interaction between sunshine duration and land use had explanatory power of 50%， representing the key driving factor regulating spatiotemporal patterns of carbon sequestration. Conclusion These findings provide scientific data support and decision-making reference for ecological conservation and restoration， carbon sequestration function enhancement， and sustainable development in ecologically fragile karst regions.
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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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