Description
Here, the authors investigate their individual and combined effects on carbon dynamics in a temperate agricultural soil. Using the process-based LiDELSv2 model calibrated against data from the lysimeter experiment, they simulate 1000 year impacts of applying 4.2 wt% wood biochar, 2 wt% basanite rock powder (RP), their co-application, and co-pyrolyzed material (rock-enhanced biochar, RE-biochar) on soil organic carbon (SOC), net primary production (NPP), net CO
2 ecosystem exchange (NEE), and calcium (Ca
2+) leaching in a northern German sandy soil. Biochar alone led to the highest increase in SOC and achieved a modeled NEE of −200 g C ha
−1 yr
−1 per ton of biochar throughout 1000 years, acting as a long-term carbon sink. Co-application and RE-biochar increased SOC too, but to a lesser extent. Rock powder alone reduced SOC by 7%. Although RP enhanced Ca
2+ leaching, this did not result in net CO
2 removal. Ecosystem respiration and NPP remained stable in the long term.
Tags
biochar
enhanced rock weathering
