Effects of rehabilitation through afforestation on soil aggregate stability and aggregate-associated carbon after forest fires in subtropical China

Bai, Youhuang; Zhou, Yunchao; He, Hongbo

doi:10.1016/j.geoderma.2020.114548

Cited by 45 publications

(22 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, although > 2-mm aggregates had the lowest concentrations of soil OC and LOC fractions at the depth of 0-20 cm, the contribution of OC and LOC fraction storage in > 2 mm aggregates to thosethat in bulk soil was greater, because > 2-mm aggregates accounted for a higher proportion in all aggregates (Table 2). These results indicated that the storage of soil aggregate-related OC and LOC fractions in this study was mainly determined by the proportion of different sized aggregates rather than the concentrations of soil aggregate-related OC and LOC fractions, which contradicts the findings of Egan et al (2018) and Bai et al (2020). As for the soil ecosystem, Egan et al (2018) and Bai et al (2020) revealed that only when the proportion The change in soil OC storage in a period of planting divided by the length of this period is utilized as an index for estimating the increased or decreased rate of soil OC storage (Su et al 2009).…”

Section: Soil Carbon Storage In Aggregatescontrasting

confidence: 95%

“…These results indicated that the storage of soil aggregate-related OC and LOC fractions in this study was mainly determined by the proportion of different sized aggregates rather than the concentrations of soil aggregate-related OC and LOC fractions, which contradicts the findings of Egan et al (2018) and Bai et al (2020). As for the soil ecosystem, Egan et al (2018) and Bai et al (2020) revealed that only when the proportion The change in soil OC storage in a period of planting divided by the length of this period is utilized as an index for estimating the increased or decreased rate of soil OC storage (Su et al 2009). Most of the reported change rate of soil OC storage is in an order of magnitude, with the average of 33 g OC m −2 year −1 for forest and agricultural chronosequences (Post and Kwon 2000).…”

Section: Soil Carbon Storage In Aggregatescontrasting

confidence: 95%

“…At the early phase (initial 17 years), fir planting contributed to the increase of > 2-mm aggregates, while at the late phase (after 17 years), fir planting led to the decrease in these aggregates (Table 2). These findings are consistent with the previous studies suggesting that soil aggregation is a dynamic process in nature and that the composition of soil aggregates is affected by the stand age to a significant extent (Xiao et al 2019;Bai et al, 2020). The change of soil aggregate stability was readily reflected by the variation in soil MWD, which plays a vital role in the assessment of aggregate stability (Six and Paustian 2012).…”

Section: Soil Aggregate Composition and Stabilitysupporting

confidence: 91%

“…As a result, the concentrations of soil OC and LOC fractions vary among the aggregates of different sizes. Therefore, it is essential to determine the distribution of OC and LOC fractions in soil aggregates for better understanding the dynamic of soil carbon in the forest ecosystem (Bai et al 2020).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Huang

Zhang

et al. 2021

Ecol Process

View full text Add to dashboard Cite

Background Revealing the variations in soil aggregate-related organic carbon (OC) and labile organic carbon (LOC) fractions in a chronosequence of Chinese fir plantations plays an important role in better understanding the impact of soil carbon sink or source on the Chinese fir plantation ecosystem. In this study, soil samples in a depth of 0–20 cm were collected from Chinese fir plantations at different stand ages (0, 9, 17, and 26 years old) in Guangxi, China. With the optimal moisture sieving method adopted, the soil aggregates of 4 different sizes were obtained, including > 2-mm, 2–1-mm, 1–0.25-mm, and < 0.25-mm aggregates. Soil OC and LOC fractions were measured in the aggregates of different sizes. The LOC fractions included readily oxidizable carbon (ROC), particulate organic carbon (POC), microbial biomass carbon (MBC), water-soluble organic carbon (WOC), and mineralized organic carbon (MOC). Results Soil aggregate stability, as indicated by the mean weight diameter (MWD), was the highest in the 17-year-old Chinese fir plantations and was significantly positively related (p < 0.05) to the concentrations of OC and LOC fractions (except for the ROC and MOC), with the POC in particular. As for all stand ages of Chinese fir plantations, the concentrations of soil OC and LOC fractions were significantly increased as the aggregate size decreased. Consequently, there were more OC and LOC fractions distributed in the < 0.25-mm aggregates. During the stand development, the concentrations of soil OC and LOC fractions first increased and then decreased, with the highest levels detected in the 17-year-old Chinese fir plantations, indicating that the 17-year-old Chinese fir plantations were conducive to the accumulation of soil OC and LOC fractions. Conclusion After 17 years of planting, promoted soil carbon (especially for the POC) accumulation contributes significantly to enhancing soil aggregate stability for the Chinese fir plantations in Guangxi, China.

show abstract

Section: Soil Carbon Storage In Aggregatescontrasting

confidence: 95%

Section: Soil Carbon Storage In Aggregatescontrasting

confidence: 95%

Section: Soil Aggregate Composition and Stabilitysupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Huang

Zhang

et al. 2021

Ecol Process

View full text Add to dashboard Cite

show abstract

“…The soil aggregate stability was characterized by the mean weight diameter (MWD), geometric mean diameter (GMD), fractal dimension (D), and proportion of >0.25 mm water-stable aggregates (WSA > 0.25 mm). The stability parameters of aggregates were calculated using the following formulae [25]:…”

Section: Analyses and Calculationsmentioning

confidence: 99%

Variability in Carbon Stocks across a Chronosequence of Masson Pine Plantations and the Trade-Off between Plant and Soil Systems

Dai

et al. 2021

Forests

View full text Add to dashboard Cite

Plantations sequester atmospheric carbon dioxide and positively respond to climate change, but the carbon (C) sequestration capacity and the trade-off between plant and soil systems in plantations may vary significantly across a chronosequence. Masson pine (Pinus massoniana Lamb.) plantations were selected to investigate the variability of C stocks in 7-, 14-, and 30-year-old stands. The total ecosystem C stock increased with stand age from 14.82 to 19.21 Mg C. Carbon stocks increased with stand age in the plant system but decreased in the soil system, with the ratio of plant-to-soil C stocks increasing from 0.06 in the 7-year-old plantation to 0.70 in the 30-year-old plantation. Carbon stocks in the first 20 cm of the soil accounted for 44.60%, 43.01%, and 30.18% of the total ecosystem carbon stock in 7-, 14-, and 30-year-old plantations, respectively. The variation trends for the proportions of C stock in soil decreased with soil depth as a result of tree and root growth regardless of stand age. Most C was stored in the stems, which contributed 1.36%, 6.85%, and 29.57% of total ecosystem C stock across the chronosequence. Results of structural equation model indicated that the effect of plant system C stock on ecosystem C stock was far larger than soil system C stock, and saturated hydraulic conductivity (ks) and fractal dimension (D) could be the primary parameters affecting ecosystem C stocks according to redundancy analysis (Variance explained by the variables selected). In summary, the plant system increased biomass C stocks by regulating soil properties to meet their growth requirements, the growth of plants in turn changed the soil organic carbon (SOC) stock, then both regulated ecosystem carbon sequestration in Masson pine plantations.

show abstract

Evaluating soil carbon stability by combining δ13C and soil aggregates after afforestation on agricultural land and thinning management

Zhang

Geng

et al. 2023

Plant Soil

View full text Add to dashboard Cite

Background and AimsAfforestation and thinning management are effective ways to mitigate global warming. The mechanism of soil carbon recovery is effectively explored by linking soil aggregate and isotopic 13 C. MethodsSoil samples were collected from nearby agricultural land (AL) and larch plantations (established in 1965 and thinning in1995, UT: 2500 tree ha − 1 , MT: 1867 tree ha − 1 , and ST: 1283 tree ha − 1 ). The soil was separated into three aggregates (LMAC: >2 mm, SMAC: 2-0.25 mm, MIC: 0.25 − 0.053), minerals associated with organic matter (MAOM: <0.053 mm), and carbon fractions within macroaggregate. ResultsWe found that afforestation on agricultural land signi cantly increased mean weight diameter (MWD).But thinning intensifying decreased MWD resulting from the distribution of LMAC replaced by SMAC.Moreover, after afforestation, the carbon concentration in soil aggregates and MAOM was signi cantly decreased, and the C stability of macroaggregates was weakened, while could be strong after thinning. Thinning decreased the C/N in soil aggregates and MAOM and the effect of thinning intensity on C/N was obvious with the shrinking of particle size. The δ 13 C, controlled by soil aggregates, signi cantly decreased in each soil aggregate after afforestation while increased after thinning. Additionally, the carbon concentrations, C/N and δ 13 C of small-size particles (< 0.25 mm) and the distribution of SMAC are important for soil carbon indicators (SOC, C/N, CO 2 uxes and δ 13 C). ConclusionWe conclude that soil aggregate distribution shows a recovery tendency for soil carbon, suggesting that increasing thinning intensity is bene cial for the accumulation of older carbon and the e ciency of nitrogen in more stable fractions.

show abstract

Effects of rehabilitation through afforestation on soil aggregate stability and aggregate-associated carbon after forest fires in subtropical China

Cited by 45 publications

References 55 publications

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Variability in Carbon Stocks across a Chronosequence of Masson Pine Plantations and the Trade-Off between Plant and Soil Systems

Evaluating soil carbon stability by combining δ13C and soil aggregates after afforestation on agricultural land and thinning management

Contact Info

Product

Resources

About