Litterfall variation and soil nutrient dynamics in Swietenia macrophylla, Samanea saman and Bambusa blumeana woodstands: Implications for nutrient cycling and soil fertility

This study addresses the knowledge gap regarding litterfall dynamics in university wood stands, focusing on Tarlac Agricultural University and its diverse tree species. While extensive research exists on soil dynamics and litterfall in large-scale plantations and forested areas in the Philippines, university wood stands remain understudied. The research assesses and compares litterfall variation among Swietenia macrophylla, Samanea saman and Bambusa blumeana, exploring implications for nutrient cycling, soil fertility, and amelioration. Litterfall was collected using the catch net method, followed by soil nutrient analyses to establish correlations. Results indicate significant variations in litterfall quantity, organic matter, phosphorus, and nitrogen across akasya, mahogany, and kawayang tinik woodstands. S. macrophylla (mahogany) shows the highest litterfall production (39.97 gday-1), while S. saman (akasya) exhibits the highest organic matter content in both top and subsoil layers (2.23% and 1.69%). B. blumeana (kawayang tinik) woodstands demonstrate elevated nitrogen and phosphorus levels in the topsoil (0.09% and 27 ppm) while S. saman showing the highest levels in the subsoil (0.08% and 18 ppm). The study also highlights the influence of leaf senescence seasonality on litterfall production and species-specific nutrient composition in soil layers. Notably, kawayang tinik shows promise for soil amelioration due to its substantial litterfall production and positive soil quality impact. In conclusion, this research provides valuable insights into litterfall and soil nutrient dynamics in university wood stands, emphasizing the role of plant species and offering practical implications for soil management strategies. B. blumeana emerges as pivotal for enhancing soil fertility and amelioration, with broader implications for sustainable agriculture practices.