Land use types with different fertilization management affected isotope ratios of bulk and water-extractable C and N of soils in an intensive agricultural area

Effects of planting basins and farmyard manure addition on soil carbon and nitrogen pools under on‐farm conditions in Makueni county of Kenya

“…Soil C and N isotope compositions (δ 13 C and δ 15 N, respectively) are useful indicators for C and N cycling in terrestrial ecosystems under long‐term climate change and local management/disturbance (Fu et al., 2020; Rui et al., 2011; Sun et al., 2010; Xu et al., 2008, 2009). Soil δ 13 C and δ 15 N are also used to understand the pathways in which C and N leave the ecosystem (Ibell et al., 2010, 2013; Reverchon et al., 2012; Wang, Wang, et al., 2015; Wang, Xu, et al., 2015; McCorkle et al., 2016; Jeong et al., 2022). The 15 N of N sources such as manure or fertilizer applied to the soil, N loss, and N cycling processes affects soil δ 15 N (Asadyar et al., 2021; Choi et al., 2017, 2020; Succarie et al., 2022; Zhang et al., 2018).…”

“…The C cycle is vital because it affects soil respiration and the process of plant photosynthesis (Farooq et al., 2021; Liu et al., 2021; Succarie et al., 2020; Fu et al., 2023). Soil δ 13 C reflects the source of organic matter (C 3 or C 4 vegetation), C turnover and C loss rates from an ecosystem (Han et al., 2020; Jeong et al., 2022). Thus, δ 13 C and δ 15 N are insightful indicators of land management practices' effect on soil C and N availability and its dynamics.…”