Enhancing soil ecological stoichiometry and orchard yield through ground cover management: A meta-analysis across China

Ground cover management (GCM) is a critical agricultural practice that influences soil ecological stoichiometry (SES) and orchard productivity. However, its effects on soil carbon (C), nitrogen (N), and phosphorus (P) dynamics and their implications for fruit yield remain poorly understood. This study synthesizes 12,486 paired observations from 415 studies to assess the impact of GCM on soil SES and orchard yield across China. Results indicate that GCM significantly increases soil C (20.0 %), N (15.0 %), and P (13.0 %) concentrations, as well as C: N (4.9 %), C:P (6.6 %), and N:P (2.6 %) ratios, leading to a 13.9 % improvement in fruit yield. The effects of GCM vary with various management practices and environmental factors. Mowing enhances soil C (20.0 %) sequestration and yield (17.4 %) more effectively than no mowing (19.0 % C, 1.9 % yield). A random forest model identifies mean annual precipitation (MAP) and mean annual temperature (MAT) as key climatic drivers of SES and yield, with maximum yield benefits (14.5 %-18.2 %) observed in cooler, drier regions (MAP <= 600 mm, MAT <= 15 degrees C). These findings highlight GCM as a sustainable strategy for improving soil health and maintaining orchard productivity under variable climatic conditions.