Impacts of plant root traits and microbial functional attributes on soil respiration components in the desert-oasis ecotone

Frontiers in Plant Science, Journal Year: 2025, Volume and Issue: 16

Published: Feb. 11, 2025

Dividing soil respiration (Rs) into autotrophic (Ra) and heterotrophic (Rh) represents a pivotal step in deciphering how Rs responds to environmental perturbations. Nevertheless, arid ecosystems beset by stress, the partitioning of underlying mechanisms through which microbial root traits govern distinct components remain poorly understood. This study was strategically designed investigate its (Ra Rh), properties, within desert-oasis ecotone (encompassing river bank, transitional zone, desert margin) northwest China. Employing metagenomics, we quantitatively characterized taxonomic attributes (i.e., composition) functional (specifically, genes implicated carbon metabolism). Field measurements during growing season 2019 unveiled pronounced decline rates along gradient from bank margin. The mean rate recorded as 1.82 ± 0.41 μmol m -2 s -1 at 0.49 0.15 meager 0.45 0.12 Concomitantly, Ra Rh exhibited similar trend throughout period, with emerging dominant driver Rs. Utilizing random forest modeling, unearthed significant associations between features components. Notably, both displayed robust positive correlations abundance phosphatidylinositol glycan A, key player metabolism. Partial least squares path modeling further elucidated that properties functions exerted direct influences on Rh, whereas failed register impact. When considering combined effects biotic abiotic factors, emerged linchpin dictating composition. Collectively, these findings suggest trait-based approach holds great promise more effectively revealing response composition changes, thereby offering novel vistas for future investigations cycling terrestrial soils.

Language: Английский

Subsoiling Before Wheat Sowing Enhances Grain Yield and Water Use Efficiency of Maize in Dryland Winter Wheat and Summer Maize Double Cropping System Under One-Off Irrigation Practice During the Wheat Season

Plants, Journal Year: 2025, Volume and Issue: 14(5), P. 738 - 738

Published: Feb. 28, 2025

The winter wheat and summer maize double cropping system is the primary pattern for in dryland areas of China. management tillage this typically conducted before sowing. However, few studies have validated quantified impact methods sowing irrigation practices during season on yield formation water use efficiency maize. Therefore, study hypothesized that subsoiling improves WUE by enhancing soil moisture retention plant development. A three-year field experiment with a two-factor split-plot design was at junction Loess Plateau Huang-Huai-Hai Plain China validation, from 2019 to 2022. Three (RT: rotary tillage; PT: plowing, SS: subsoiling) were assigned main plots, two growing (W0: zero-irrigation; W1: one-off irrigation) subplots. We measured moisture, grain yield, dry matter accumulation, nitrogen (N), phosphorus (P), potassium (K) results indicated increased storage maize, thereby promoting nutrient accumulation. Compared an average 19.5% 21.8%, respectively. One-off had negative effects pre-sowing productivity terms can mitigate these irrigation. Correlation analysis path model greater than season. most direct factor affecting whereas technique order preference similarity ideal solution (TOPSIS) comprehensive evaluation superior achieving high under practice These findings offer practical guidance optimizing drylands.

Language: Английский