Effects of Litterfall on the Accumulation of Extracted Soil Humic Substances in Subalpine Forests

Wei, Xinyu; Yang, Yunfeng; Shen, Ya; Chen, Zihao; Dong, Yuliang; Wu, Fuzhong; Zhang, Li

doi:10.3389/fpls.2020.00254

Cited by 16 publications

(9 citation statements)

References 67 publications

(79 reference statements)

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“…Another important factor is the high carbon input from litter and plant roots incorporated in the soil. This corresponds to what was observed in the field, where the litter layer is considerably thick, which improves humification conditions and the formation of the very stable clay-humus complex in the soil (Duchaufour, 1970;Ono et al, 2011;Wei et al, 2018;Wei et al, 2020). As such, afforestation is still proposed as one of the most important climate change mitigation approaches, owing to its role in promoting the accumulation and concentration of SOC stocks, as well as being one of the most technically accessible and cost-effective climate engineering methods (Smith et al, 2016).…”

Section: Discussionsupporting

confidence: 75%

Effect of Plant Communities and Ecological Parameters on Soil Organic Carbon Stocks in the Mamora Forest, Morocco

Boujraf¹,

Dallahi²,

Dahmani³

et al. 2023

J. Ecol. Eng.

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Several studies on the assessment of soil organic carbon (SOC) stocks have been carried out at the global level. However, reliable information on SOC stocks is not readily available at the regional level. In addition, very few studies have assessed the factors responsible for the variation of SOC stocks, in particular the effect of plant communities. For this purpose, the main objective was to analyze the effects of three plant communities and ecological parameters on the SOC stock in the Mamora forest. Specifically, the authors looked to examine the relationships between SOC stock and plant communities and to define the main parameters that directly influence SOC stock. Ten soil profiles with three replications were sampled at each plant community, from which SOC stock was determined. To assess the effect of plant communities on SOC stocks, phytosociological surveys were carried out according to the phytosociological stigma method developed by Braun-Blanquet. The results show that the SOC stocks in cork oak soils are characterized by high variability, with values ranging from 55 t•ha -1 to 95 t•ha -1 . Indeed, the findings of this study showed that the SOC stocks fluctuated significantly with plant communities. In addition, SOC stocks were also affected by the interactions between plant communities, the amount of litter and the density of the cork oak stand. These outcomes of this study highlight the critical need to incorporate community-specific carbon values into future carbon sequestration modeling.

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Section: Discussionsupporting

confidence: 75%

Effect of Plant Communities and Ecological Parameters on Soil Organic Carbon Stocks in the Mamora Forest, Morocco

Boujraf¹,

Dallahi²,

Dahmani³

et al. 2023

J. Ecol. Eng.

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“…Three 15 m × 15 m plots were randomly established under complete forest canopy cover in each forest type in May 2017 (Supplementary Figure S1) [29]. Five in situ incubation boxes (length 70 cm, width 43 cm, and depth 51 cm) were installed at each plot throughout the study period, a total of 45 boxes (5 × 3 plots × 3 sites = 45).…”

Section: Experimental Designmentioning

confidence: 99%

“…Freeze-thaw cycles were defined as periods where the temperature was above or below freezing for 3 h until it changed to below or above freezing again [30]. Most freeze-thaw cycles occurred from October 2017 to March 2018 [29].…”

Section: Experimental Designmentioning

confidence: 99%

Decreased Soil Organic Carbon under Litter Input in Three Subalpine Forests

Chen

Shen

Tan

et al. 2021

Forests

Self Cite

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Soil organic carbon (SOC) is the largest terrestrial organic carbon pool. Plant litter is an important source of SOC, but the knowledge gap between SOC fractions and plant litter input remains inconsistent. Here, a litter input control experiment was conducted at three subalpine forest types (coniferous forest, mixed forest, and broadleaved forest). We assessed the variations of total organic C, active organic C (easily oxidizable C, labile organic C), recalcitrant organic C, and microbial biomass C under litter input or removal. The results showed that soil total organic C decreased greatly under litter input. It was mainly caused by the change of easily oxidizable C and labile C, while the influence of recalcitrant C was small. At the same time, this effect varied among different forest types. Among them, the effect of litter input on SOC was weak and slow in the coniferous forest with low-quality litter input, while a quick effect was observed in the mixed and broadleaved forests with high-quality litter input. Microbial biomass C declined under litter input in most cases, and its variation was strongly controlled by soil temperature and freeze-thaw events. Overall, our results provide new evidence that forest type would strongly control SOC dynamics, in concert with litter quality shifts, with potential consequences for long-term C sequestration. We highlighted that litter input could reduce microbial biomass carbon which might limit the native SOC decomposition, but the loss of active C ultimately changed the SOC in the subalpine forests. It suggested that the interaction of multiple mechanisms should be considered in the study of SOC in this region.

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“…Previous studies have demonstrated that bamboo forests contain more fine root biomass than other forest types. Additionally, compared with woody plants (BMF, CBMF, FF), the BF had higher annual growth and turnover rates [54]. Due to the stand age of our study area, the fine roots were mainly distributed in toper soil.…”

Section: Distribution Of Humic Substances In Bulk Soilmentioning

confidence: 81%

Long-Term Forest Conversion Affects Soil Stability and Humic Substances in Aggregate Fractions in Subtropical China

Meng

Zhao³

et al. 2022

Forests

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Soil aggregates are the basic structural components of soil, which are important factors that can predict erosion resistance. However, few researchers have investigated the effects of forest conversion on the stability of soil aggregates, particularly in subtropical forests. In this study, soils from various depths (0 to 30 cm) were collected from four forest types (transformed from broadleaved forests (BMF) to combined coniferous broadleaved (CBMF), Chinese fir (FF), and bamboo forests (BF)) to determine the impacts of forest conversion on the physical and chemical properties of soil, water-stable soil aggregates, and aggregate-associated humic substances. The results showed that forest conversion had no effects on the soil’s physical properties, or the humic substances in bulk soil, but had significant effects on soil aggregates. In addition, the conversion of broadleaved forest to Chinese fir forest increased the soil stability, and to bamboo forest, decreased the soil stability. Finally, the soil’s physicochemical properties were closely related to aggregate-associated humic substances. In summary, specific forest management measures should be applied to strengthen the positive impacts and reduce the negative impacts associated with forest conversion.

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Effects of Litterfall on the Accumulation of Extracted Soil Humic Substances in Subalpine Forests

Cited by 16 publications

References 67 publications

Effect of Plant Communities and Ecological Parameters on Soil Organic Carbon Stocks in the Mamora Forest, Morocco

Effect of Plant Communities and Ecological Parameters on Soil Organic Carbon Stocks in the Mamora Forest, Morocco

Decreased Soil Organic Carbon under Litter Input in Three Subalpine Forests

Long-Term Forest Conversion Affects Soil Stability and Humic Substances in Aggregate Fractions in Subtropical China

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