Effects of nitrogen addition on the concentration and composition of soil-based dissolved organic matter in subtropical Pinus taiwanensis forests

Influence mechanisms of N addition on the concentration of soil dissolved organic matter in China

“…Soil dissolved organic matter (DOM) is a small and labile pool of soil organic matter characterized by high mobility, reactivity, and availability (Xu et al, 2018; Yuan et al, 2022). Soil DOM includes dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) (Lei et al, 2017; Sun et al, 2015).…”

“…Soil DOM has important effects on the cycling of nutrients, the dynamic of carbon and nitrogen, and the transport of pollutants in soil (Lei et al, 2017; Sun et al, 2015; Zhang et al, 2019). Moreover, soil DOM is regarded as a pivotal indicator of soil quality on account of its sensitive response to environmental change (Yuan et al, 2022). Hence, the study of soil DOM is essential for the clear understanding on terrestrial biogeochemistry.…”

“…Hence, N enrichment can impact the balance of soil organic matter by increasing N availability and decreasing soil pH. Previous studies reported that soil DOM (including DOC and DON) concentration could be changed by N addition (Jing et al, 2021; Lei et al, 2017; Yuan et al, 2022). However, soil DOM concentration influenced by N addition remained inconsistent, with not only the magnitude but also the direction (Jing et al, 2021; Wang et al, 2022; Yuan et al, 2020).…”

“…However, soil DOM concentration influenced by N addition remained inconsistent, with not only the magnitude but also the direction (Jing et al, 2021; Wang et al, 2022; Yuan et al, 2020). Soil DOC concentration showed increase (Niu et al, 2021; Sun et al, 2015), decrease (Jing et al, 2021; Yuan et al, 2022), and minor change (Chen et al, 2022; Li et al, 2019b) in response to N addition. Moreover, soil DON concentration had positive (Jing et al, 2021; Tian et al, 2013), negative (Luo et al, 2020), and neutral (Li et al, 2019b; Yuan et al, 2022) change by N addition.…”

“…Soil DOC concentration showed increase (Niu et al, 2021; Sun et al, 2015), decrease (Jing et al, 2021; Yuan et al, 2022), and minor change (Chen et al, 2022; Li et al, 2019b) in response to N addition. Moreover, soil DON concentration had positive (Jing et al, 2021; Tian et al, 2013), negative (Luo et al, 2020), and neutral (Li et al, 2019b; Yuan et al, 2022) change by N addition. Thus, the trade‐offs in N availability and soil pH caused by N addition potentially regulate the soil DOM concentration.…”