Composition and stability of organic carbon in the top soil under different forest types in subtropical China

Suyun, 商素云 Shang; Peikun, 姜培坤 Jiang; Zhaoliang, 宋照亮 Song; Yongfu, 李永夫 Li; Lin, 林琳 Lin

doi:10.5846/stxb201111301831

Cited by 4 publications

(3 citation statements)

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“…The chemical fractions of the SOC in the different topographic areas were characterized by alkyl carbon > O-alkyl carbon > carboxyl carbon > aromatic carbon. The ranking of the SOC fractions is similar to those of subtropical evergreen board-leaved forest and Masson pine in China (Shang et al, 2013), and subtropical natural forest and hoop pine plantation in Australia (Chen, Xu & Mathers, 2004) with 13CNMR technology. Alkyl carbon was the largest component of the SOC fractions, indicating that the SOC comprised a higher percentage of passive carbon in SOC.…”

Section: Discussionmentioning

confidence: 56%

“…Studies on the protection of soil C by soil texture, such as silt and clay, had long been well established (Hassink, 1997). Solid 13CNMR technology is a method for dissecting SOC chemical fractions and has been applied into tropical forest soil stability research Shang et al, 2013;Wang, 2010). Previous studies illustrated that the composition of the SOC chemical fractions is affected by soil microorganisms, soil properties, and carbon input (Elberling, Breuning-Madsen & Knicker, 2013;González-Pérez et al, 2008;Ktigel-Knabner, 1997;Lorenz, Lal & Jiménez, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Studies found SOC fractions and stability varied across topography. Some studies found in lowland and plain areas alkyl carbon accounted for the most of the SOC fractions and indicated disturbance of soil and soil particle size be the key influencing factors (Chen, Xu & Mathers, 2004;Shang et al, 2013). However, other studies in plain and hills found a relative lower DI index (all less than 0.9) possibly due to the input of SOC and soil moisture (Lorenz, Lal & Jiménez, 2010;Wang, 2010).…”

Section: Introductionmentioning

confidence: 99%

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The stability of soil organic carbon across topographies in a tropical rainforest

Jiang

Yang

et al. 2021

PeerJ

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Mechanisms of soil organic carbon (SOC) stability are still unclear in forest ecosystems. In order to unveil the influences of topography on the SOC stability, a 60ha dynamic plot of a tropical montane rainforest was selected in Jianfengling, in Hainan Island, China and soil was sampled from 60 quadrats. The chemical fractions of the SOC were detected with 13C CPMAS/NMR and path analyses explore the mechanisms of SOC stability in different topographies. The chemical fractions of the SOC comprised alkyl carbon > O-alkyl carbon > carboxyl carbon > aromatic carbon. The decomposition index (DI) values were greater than 1 in the different topographies, with an average DI value was 1.29, which indicated that the SOC in the study area was stable. Flat and top areas (together named RF) had more favorable nutrients and silt contents compared with steep and slight steep areas (together named RS). The influencing factors of SOC stability varied across the topographies, where SOC, soil moisture (SM) and ammoniacal nitrogen (NH4+-N, AN) were the main influencing factors in the RF, while SM and AN were the main factors in the RS. Greater SOC and AN strengthened the SOC stability, while higher soil moisture lowered SOC stability. The inertia index was higher in the RS than the RF areas, indicating that local topography significantly affects SOC content and SOC stability by changing soil environmental factors. Topography cannot be neglected in considering SOC stability and future C budgets.

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Section: Discussionmentioning

confidence: 56%