Changes in soil aggregate stability and aggregate-associated organic carbon during old-field succession in karst valley

Effects of Water-Level Fluctuation on Soil Aggregates and Aggregate-Associated Organic Carbon in the Water-Level Fluctuation Zone of the Three Gorges Reservoir, China

“…As a result, large size aggregates were broken into small size aggregates. Although the macro-aggregate content decreased from SI to LI, macro-aggregate content increased with an increase in soil depth at each water level, which was speculated to be due to the difference in soil root distribution patterns [39]. MWD, GMD and D are quantitative indexes to identify the structure stability of soil aggregates, which is highly correlated with soil corrosion resistance.…”

“…According to the results of aggregate distribution measured by the wet sieving method, common indexes such as mean weight diameter (MWD), geometric mean diameter (GMD) and fractal dimension (D) of the aggregates were calculated to determine the stability of the aggregates [39].…”

“…Total SOC content under different water levels was determined by the K 2 Cr 2 O 7 -H 2 SO 4 oxidation method [23]. The labile carbon in soil fractions in different water levels was determined by a modified Walkley and Black method [39,40]. We put the bulk soil and soil aggregates into a glass bottle and mixed 10 mL of 0.5 M K 2 Cr 2 O 7 with 2.5 mL of 18 M H 2 SO 4 to measure labile carbon.…”

Effects of vegetation restoration types on soil erosion reduction of a shallow karst fissure soil system in the degraded karst areas of Southwestern China

“…However, most of them have focused primarily on the influence of vegetation type on the soil nitrogen cycle (Tang et al, 2021;Wang et al, 2022a), organic carbon (Hu et al, 2022), aggregate stability, and quality (Zhang et al, 2021a(Zhang et al, , 2021b. Soil erosion reduction can be characterized by shear resistance (Sun et al, 2016;Zhang et al, 2020), organic carbon (Walia & Dick, 2018), aggregate stability (Li et al, 2022), saturated soil hydraulic conductivity (Guo et al, 2021;Parsakhoo et al, 2014), clay ratio (Kusre et al, 2018), mean weight diameter (MWD) of water-stable aggregate, and soil disintegration rate (Guo et al, 2020). Numerous studies have revealed that different revegetation measures drive changes in vegetation types and alter soil and root properties, thereby affecting soil erosion reduction (Fayiah et al, 2019;Guo et al, 2018a).…”

“…Hao et al (2020) studied the effect of vegetation restoration on soil infiltration in heavy‐textured soils and found that grass‐planted soils have greater benefits for improving soil organic matter and aggregate stability than shrub‐planted and bare soils. However, Li et al (2022) found that vegetation succession increased the MWD and geometric mean diameter of the aggregates and contributed to improving soil aggregate stability but had a limited effect on soil organic carbon sequestration in karst valleys. Chen and Zhou (2013) found that the soil erosion reduction of woodlands was higher than that of other land use types.…”