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Based on the Biome-BGC ecological process model, the spatial and temporal dynamics of carbon and water flux, water use efficiency (WUE), and its driving factors in the past 24 years were simulated and analyzed, and the soil moisture vegetation carrying capacity of different stands was estimated. The carbon and water fluxes increased year by year, and the average annual growth rates of GPP and ET were 6.42g C/m2 and 5.45kg H2O/m2, respectively. WUE decreased by 0.006g C/kg H2O, showing a trend of carbon efficiency and water consumption imbalance. Interspecific competition significantly affected the dynamic stability of WUE. The shrub pure forest showed stronger adaptability in the carbon and water regulation relationship. The increase of CO2 concentration was the main driving factor leading to the decrease of WUE, and had a significant indirect effect through temperature (indirect path coefficient 0.435) and NDVI (indirect path coefficient 0.808). Moderate regulation of stand structure and surface vegetation coverage can effectively improve regional WUE. The results of soil moisture vegetation carrying capacity showed that there was still room for improvement in the current planting density of arbor forest, shrub forest and shrub-shrub mixed forest, which could be increased by 15.07%, 3.78% and 16.72%, respectively. The study is helpful to clarify the water use mechanism of different vegetation types in arid and semi-arid areas, define the ecological limits of vegetation restoration projects under the constraints of water resources, and provide theoretical support and decision-making basis for regional 'planting by water' policy formulation and sustainable management of sandy ecosystem.
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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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