The soil P fractions, PCGs abundances, P cycling process abundance, and soil properties

Soil metagenomic data of alpine meadow on the Tibetan Plateau under warming and altered precipitation.The warming-by-precipitation experiment was established in May 2015 at the Alpine Research Station (33°59’N, 102°00’E, ca. 3538 m above sea level) in the eastern Gannan Autonomous Prefecture, Gansu Province, China.A two-factor full factorial interaction manipulation experiment was designed with a randomized block design, including two levels of atmospheric temperature (ambient temperature [T⁰] and warming [T⁺]) and three levels of precipitation (ambient precipitation [nP], 30% precipitation reduction [-P], and 30% precipitation increase [+P]), totally resulting in six treatment combinations. Specifically, six treatments were conducted, including (1) T⁰-P, (2) T⁺-P, (3) T⁰nP, (4) T⁺nP, (5) T⁰+P, and (6) T⁺+P. Each treatment was replicated in four fields (four plots, each 4 m × 4 m). The plots within each block were separated by access paths that were 1.5 m wide, while the distance between adjacent blocks was 5 m.Due to the absence of electricity in the field, the warming treatment was achieved by installing four hexagonal open-top chambers into each plot, which consisted of six transparent polymethyl methacrylate (PMMA) isosceles trapezoidal plates measuring 0.59 m and 0.75 m wide at the top and bottom, respectively, and 0.52 m tall. These devices resulted in an average daily air temperature increase of 1.54 ± 0.07 °C (mean ± standard error) at 15 cm above the ground throughout the growing season (Zhang et al., 2020). The precipitation manipulations in each plot were achieved by deploying rainfall-excluding shelters periodically and individually. Furthermore, distinct precipitation treatments were implemented in each plot throughout the period. Specifically, PMMA shelters were placed 1 m high above the soil to intercept 30% of rainfall for the decreased precipitation (T⁰-P and T⁺-P) treatments. This rainwater was collected and evenly distributed among the nearest increased precipitation (T⁰+P and T⁺+P) plots throughout the growing season.