Dynamics of soil organic carbon and dissolved organic carbon in Robina pseudoacacia forests

Abstract

We investigated the variation patterns of organic carbon in soil and soil solution of four selected Robinia pseudoacacia forests aged 10a, 25a, 31a, and 35a, as well as a contrastive tillage site in a similar topography condition in Loess Plateau, China. The purpose was to explore the dynamics of soil organic carbon (SOC) and dissolved organic carbon (DOC) in R. pseudoacacia forests. On average depths of 20, 40, and 60 cm, SOC, active organic carbon (AOC), and DOC gradually increase with increased forest age. After forest restoration, the AOC/SOC ratio and resistant organic carbon/SOC ratio increase, whereas the slow organic carbon/SOC ratio decreases. The soil solutions in the subsoil layer have low DOC:DON ratio and high UV absorption at 280 nm. At 40 and 60 cm, the depth distribution is indicated as special low values for DOC concentration in the C99 site (10a site), as well as for soil water content, SOC, and AOC in the 25a forest site. Our results provide evidence that during forest restoration, SOC does not consistently increase linearly. The change points of different SOC proportions and DOC concentrations at various depths are not same, i.e., asynchronous changes exist.

Changes in chemical composition of litter during decomposition: a review of published 13c nmr spectra

“…Litter decomposition influences soil biogeochemistry of plant stands and affects the formation of soil organic matter (SOM). Due to its decomposability litter affects organic carbon accumulation in the soil and, consequently, stabilization of SOM (Lv and Liang, 2012). Differences across ecosystems are the result of different climates, varying litter input into the soil (Aranda and Comino, 2014), and changing availability of litter carbon for decomposition and potential carbon stabilization in soil (Six et al, 2002).…”

Revegetation of artificial grassland improve soil organic and inorganic carbon and water of abandoned mine

“…Because plant roots made significant contributions to soil carbon under grassland (McNally et al, 2015). Lv and Liang (2012) also found that during forest restoration, SOC did not consistently increase linearly with restoration years.…”

“…Artificial grassland establishment also significantly improved SOC in the topsoil (Wu et al, 2010). So reclamation of drastically disturbed mine soil and subsequent planting trees or grass could rapidly build-up carbon in the soil (Nyamadzawo et al, 2008;Lv and Liang, 2012).…”

Which land use is better suited to increase the fertility of ex-arable sandy soils?

“…However, land use change affects soil morphological, physical, chemical and biological properties, as it changes both the type of vegetation and the nature of the agrotechnical measures applied (Prokofeva, Poputnikov, 2010;Kalinina et al, 2013;Novikova, Konyushkova, 2013). Lv and Liang (2012) propose that by reducing the anthropogenic load and the intensity of the economic activity, due to agroecosystem self-regulation and prevailing zonal paedogenic processes, the soil partially regains its original condition, although it does not fully recover its natural properties. Signs of agrogenic activities in the soil profile can be recorded 100 years after the cessation of agrarian activities (Kalinina et al, 2009).…”