Examples that are interesting to me by selecting 2 initial biology and ecology topics and then adding keywords ("soil" and "biochar"):
Coarse Woody Debris of Mixed Tree Species Overrides Soil Matrix Constraints on Microbial Richness and Abundance in an Ancient Broad-Leaved Forest https://www.biorxiv.org/content/10.64898/2026.10.09.757649
Found with Aftergleam, a privacy reader for arXiv scientific papers.
Synergistic effects of biochar and vegetation on microplastic and nanoplastic removal from stormwater runoff in bioretention systems https://doi.org/10.26434/chemrxiv.15010823/v1
Found with Aftergleam, a privacy reader for arXiv scientific papers.

