Tree Fresh Leaf- and Twig-Leached Dissolved Organic Matter Quantity and Biodegradability in Subtropical Plantations in China

Extreme weather events often cause the input of fresh plant tissues into soils in forests. However, interspecific patterns tree tissue-leached dissolved organic matter (DOM) characteristics are poorly understood. In this study, we collected leaves and twigs two broadleaf trees (Liquidambar formosana Schima superba) coniferous (Pinus massoniana Pinus elliottii) subtropical plantations China, measured DOM quantity biodegradability. The production varied with organ types. Broadleaf leached greater amounts carbon (DOC), total nitrogen (DTN), phosphorus (DTP) than leaves, but an opposite pattern DOC DTN productions was observed between twigs. Regardless species, quantities DOC, DTN, DTP For both twigs, had aromaticity lower biodegradability DOM. Moreover, leaf-leached twig-leached addition, negatively correlated initial DOC:DTN ratio, despite no relationship DOC:DTP ratio. These findings highlight pivotal roles leaf habit type regulating reveal that substantial variations co-driven by N availability China.