Effects of the Application of Biochar to Plant Growth and Net Primary Production in an Oak Forest

Few studies have evaluated the application of biochar to forest ecosystems and their responses under field conditions. We manually spread grounded on floor, at rates 0 (control), 5, 10 Mg ha−1 (C0, C5 C10, respectively), an oak in central Japan test effects tree growth productivity. The relative rate diameter breast height (dbh) canopy trees (dbh > 20 cm) significantly increased C10 compared with that control (C0), but not C5, second third years after application. Despite increasing trees, foliage production (NPPF) woody (NPPW) did respond Conversely, reproductive organs (NPPR, mainly acorns) line gradients (1.04 ± 0.09 yr−1 C0, 1.30 0.08 1.47 0.13 C10). Since contribution NPPR total NPP was fairly small, there were no significant differences (=NPPW + NPPF NPPR) for (14.57 0.20 yr−1) or (16.11 0.73 (15.07 0.48 yr−1).