2026-10-06T23:15:15Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34007328 2026-09-28T02:55:51Z category_24031 category_24019 item_type_3 month_year_09_2026

<b>Does forest soil respiration has </b><b>legacy effects</b><b> following nitrogen inputs discontinue?</b> Leming Ge (22005470) Tong Li (23118428) Forestry management and environment Forest ecosystems Nitrogen Legacy effect CO2 emission CH4 uptake Greenhouse gas fluxes Enzyme <p dir="ltr">Declining atmospheric nitrogen (N) deposition does not necessarily mean that the effects of historically elevated<b> </b>N inputs on carbon cycling will disappear rapidly. However, The legacy effects of historical N addition on forest greenhouse gas fluxes following N cessation remain poorly understood. We conducted this study in a cold-temperate coniferous forest in China that had previously received high N addition at 60 kg N ha^-1 yr^-1. We measured soil CO₂ and CH₄ fluxes during the growing season in the first, third, and fifth years after N cessation and examined their relationships with soil enzyme activities and elemental contents. Historical N addition produced persistent but asynchronous legacy effects on different greenhouse gas fluxes. In the first and third years after N cessation, CO₂ flux increased significantly by 37.2% and 57.2%, respectively, but this effect disappeared by the fifth year. In contrast, historical N addition persistently suppressed soil CH₄ uptake throughout the five years following N cessation. Post-cessation CO₂ emissions were mainly positively correlated with phosphatase activity and total N content, whereas CH₄ uptake was primarily positively correlated with N-acetyl-β-D-glucosaminidase activity and negatively correlated with phosphatase activity and total N content. These contrasting relationships suggest<b> </b>that these two greenhouse gas fluxes were governed by distinct microbial nutrient-acquisition strategies. Our findings highlight the need for biogeochemical models to account for N legacy effects and their asynchronous recovery among greenhouse gas fluxes to improve predictions under declining atmospheric N deposition.</p> 2026-09-28T02:55:51Z Dataset Dataset 10.6084/m9.figshare.34007328.v1 https://figshare.com/articles/dataset/_b_Does_forest_soil_respiration_has_b_b_legacy_effects_b_b_following_nitrogen_inputs_discontinue_b_/34007328 CC BY 4.0