Reclamation substantially increases soil organic and inorganic carbon stock in riparian floodplains
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SOILS, SEC 3 • REMEDIATION AND MANAGEMENT OF CONTAMINATED OR DEGRADED LANDS • RESEARCH ARTICLE
Reclamation substantially increases soil organic and inorganic carbon stock in riparian floodplains Cuicui Hou 1 & Yingchen Li 1 & Yanwei Huang 1 & Honglei Zhu 1 & Jianmin Ma 1 & Fei Yu 1 & Xinhou Zhang 2 Received: 3 August 2020 / Accepted: 9 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose In recent decades, riparian floodplains have undergone intensive reclamation worldwide, which has potential to influence soil carbon (C) accumulation. Such influence generally varies based on reclamation duration. Therefore, a study on changes in soil C stock along the reclamation chronosequence can help reveal the impact of reclamation on terrestrial C cycling. Materials and methods We chose natural floodplains (as the control) and croplands reclaimed for 13, 24, and 33 years in the lower reaches of the Yellow River and determined soil organic C (SOC) and soil inorganic C (SIC) contents at different depths and the stocks in 0–100 cm profiles. Results and discussion The SOC and SIC stocks generally increased at average rates of 2.73 and 5.54 Mg C ha−1 yr−1, respectively, and the SIC stock was closely related with the SOC stock across the reclamation chronosequence. The SOC content increased more at 0–20 cm depth in the profile along the reclamation chronosequence, but the SIC content often had a higher rate of increase in the deep soil layers. Significantly, the contents of SOC and SIC were both positively correlated with the proportion of silt fractions. Conclusions Our findings suggest that reclaimed croplands from riparian floodplain play an important role in C accumulation, highlighting the importance of soil inorganic C in C budget. Moreover, soil C accumulation relates closely to soil texture, which changes continuously along the reclamation chronosequence and often varies due to spatial heterogeneity. Keywords Soil organic carbon . Soil inorganic carbon . Vertical distribution . Riparian floodplain . Reclamation duration
1 Introduction Soil carbon (C), as the largest C pool in terrestrial ecosystems, plays an important role in the global C cycle (Lal 2004a). The top 100-cm soil layer stores approximately 1500 Pg soil organic C (SOC) and 950 Pg soil inorganic C (SIC) (Lal 2004b). In recent decades, the changes of SOC and its effects on greenhouse gas emission have been widely investigated, because SOC is highly sensitive to anthropogenic activities and
Responsible editor: Claudio Colombo * Xinhou Zhang [email protected] 1
College of Life Sciences, Henan Normal University, Xinxiang 453007, China
2
School of Environment, Nanjing Normal University, 1 Wenyuan Rd, Nanjing 210023, China
climate change (Lal 2004b; Knorr et al. 2005; Fang et al. 2018). However, much less attention has been paid to the SIC contribution to C accumulation and climate mitigation (Guo et al. 2016; Zhang et al. 2019), which often plays an equal or greater role as the SOC in C exchange between terrestrial eco
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