Global distribution and drivers of relative contributions among soil nitrogen sources to terrestrial plants.

ABSTRACT: Soil extractable nitrate, ammonium, and organic nitrogen (N) are essential N sources supporting primary productivity and regulating species composition of terrestrial plants. However, it remains unclear how plants utilize these N sources and how surface-earth environments regulate plant N utilization. Here, we establish a framework to analyze observational data of natural N isotopes in plants and soils globally, we quantify fractional contributions of soil nitrate (f_NO3-), ammonium (f_NH4+), and organic N (f_EON) to plant-used N in soils. We find that mean annual temperature (MAT), not mean annual precipitation or atmospheric N deposition, regulates global variations of f_NO3-, f_NH4+, and f_EON. The f_NO3- increases wi

SUBMITTER: Hu CC 

PROVIDER: S-EPMC11289379 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature