Soil water limitation intensity alters nitrogen cycling at the plant-soil interface in Scots pine mesocosms
Year: 2025
Type: article
Abstract: Background and aim: More intense episodes of drought are expected to affect terrestrial nitrogen (N) cycling by altering N transformation rates, the functioning of soil microorganisms, and plant N uptake. However, there is limited empirical evidence of how progressive water loss affects N cycling at the plant-soil interface. Methods: N tracing techniques and metagenomic analyzes of microbial genes involved in N cycling to assess how different levels of soil water availability influenced the fate of N derived from decomposing litter in mesocosms with Scots pine saplings. Results: With increasing water limitation, the release of N from decomposing litter into the soil declined rapidly. However, moderate levels of water limitation barely affected the microbial metagenome associated with N cycling and the uptake of N by the saplings. Comparatively, severe levels of water limitation impaired plant N uptake, and increased the prevalence of microbial N-cycling genes potentially involved in mechanisms that protect against water stress. Genes associated with the uptake and release of N during mineralization and nitrification declined under low soil water contents. Conclusions: When soil water becomes largely unavailable, the cycling of N at the plant-soil interface is slowed down, and microbial and plant tolerance mechanisms may prevail over N uptake and microbial decomposition. Supplementary Information: The online version contains supplementary material available at 10.1007/s11104-025-07758-z.
Source: Plant and Soil
Language: English
Subfield: Soil Science
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $4,790
OpenAlex ID: W4413617644