Effects of gravel on grassland soil carbon and nitrogen in the arid regions of the Tibetan Plateau

Wang, Xiaodan; Liu, Gangcai; Liu, Shuzhen

doi:10.1016/j.geoderma.2011.07.028

Cited by 21 publications

(20 citation statements)

References 44 publications

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“…Other authors (Sodhi et al 2009;Wang et al, 2011) also reported a higher OC content in macroaggregates than in 15 microaggregates in soils, which means that organic matter could be the major binding agent in such soils (Oades and Waters, 1991). Here, the agricultural soils displayed a lower aggregate stability and total OC content than the forest soils, but the same pattern of OC distribution within aggregates.…”

Section: Dynamics Of Oc In the Eroding Areassupporting

confidence: 57%

Fluvial sedimentary deposits as carbon sinks: organic carbon pools and stabilization mechanisms across a Mediterranean catchment

Martínez-Mena¹,

Almagro²,

García-Franco³

et al. 2018

Preprint

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The role of fluvial sedimentary areas as organic carbon sinks remains largely unquantified. Little is known about mechanisms of organic carbon (OC) stabilization in alluvial sediments in semiarid and sub-humid catchments where those mechanisms are quite complex because sediments are often redistributed and exposed to a range of environmental conditions in intermittent and perennial fluvial courses within the same catchment. The main goal of this study was to evaluate the 20 contribution of transport and depositional areas as sources or sinks of CO 2 at the catchment scale. We used physical and chemical organic matter fractionation techniques and basal respiration rates in samples representative of the three phases of the erosion process within the catchment: i) detachment, representing the main sediment sources from forests and agricultural upland soils, as well as fluvial lateral banks; ii) transport, representing the main channel as suspended load and bedload; and iii) depositional areas along the channel, downstream in alluvial wedges and in the reservoir at the outlet of the 25 catchment, representative of medium and long-term residence deposits, respectively. Our results show that most of the sediments transported and deposited downstream come from agricultural upland soils and fluvial lateral bank sources, where the physico-chemical protection of OC is much lower than that of the forest soils, which are less sensitive to erosion. The protection of OC in forest soils and medium-term depositional areas (alluvial wedges) was mainly driven by physical stabilization mechanisms, while chemical protection of OC was observed in the fluvial lateral banks. However, in the 30 remaining sediment sources, in sediments during transport, and after deposition in long-term deposits (the reservoir), both mechanisms are equally relevant. Mineralization of the most labile OC, intra-aggregate particulate organic matter (MPOM), was predominant during transport. Aggregate formation and OC accumulation, mainly associated with macroaggregates and occluded microaggregates within macroaggregates, were predominant in depositional areas, being more protected than the OC from the most eroding sources (agricultural soils and fluvial lateral banks). Both temporary and permanent sediment 35 Biogeosciences Discuss., https://doi.

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Section: Dynamics Of Oc In the Eroding Areassupporting

confidence: 57%

Fluvial sedimentary deposits as carbon sinks: organic carbon pools and stabilization mechanisms across a Mediterranean catchment

Martínez-Mena¹,

Almagro²,

García-Franco³

et al. 2018

Preprint

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“…The significantly increased root biomass for maize crops with plastic film mulching may eventually increase the quantity of soil carbon [13]. Previous studies have reported that plastic film mulching can lead to a short-term decrease in the total SOC of the topsoil (0e20 cm) in spring wheat and maize [9,10], whereas gravel mulching increased the SOC in grasslands [14]. In this study, compared with the CK, the SOC stock under FM significantly decreased in the 0e20 cm layer after the 4-year duration, while the initial SOC stock under FM was the smallest among three different treatments.…”

Section: The Effects Of Mulching On the Soc Stockmentioning

confidence: 99%

“…A few studies reported that plastic film mulching resulted in significant decreases in SOC and increases in MBC and LFOC [9,10]. Wang et al [14] found gravel mulching increased the SOC stock.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of soil organic carbon stocks and fractions to soil surface mulching in semiarid farmland

Luo

Zhu

Liu

et al. 2015

European Journal of Soil Biology

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“…For a long time, to conserve erratic rainfall in the arid and semi‐arid areas, farmers have used pebble, gravel and sand mulches in rain fed fields (Li et al ., ). The gravel mulch is effective in reducing evaporation and run‐off, improving infiltration, increasing soil temperature, preventing soil degradation and erosion and thus maintaining soil fertility (Xie et al ., ; Wang et al ., ,b). However, concerns that materials like gravel may promote injurious high temperatures, alkalinization of the soil and mechanical injury to the stems have caused many growers to re‐examine their rationale for using mineral mulches as suitable ground‐covering materials around plants (Iles & Dosmann, ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different mulch materials for reducing soil surface evaporation in semi‐arid region

Farzi

Gholami

Baninasab

et al. 2017

Soil Use and Management

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In recent years, the use of new mulches for soil water conservation in arid regions has been introduced as an alternative to conventional (plastic) mulches. However, systematic studies concerning the effects of different organic [pistachio shell mulch (PSM), wheat straw mulch, de-oiled olive pomace mulch (DOM) or wood chips mulch], chemical [superabsorbent polymer (HM) or organicbased emulsion polymer (PEM)] and mineral [gravel mulch (GM)] covers on soil and water conservation are scarce. Therefore, two experiments were carried out. Experiment 1 was aimed at evaluating the effects of mulches of different composition on soil surface evaporation, whereas in experiment 2 we investigated the effects of this decrease in soil evaporation due to different mulch materials on some olive tree physiological responses to soil drying. We analysed stem water potential, transpiration rate, stomatal conductance, leaf density and maximum efficiency of photosystem II photochemistry (Fv/Fm) of 2-yr-old plants of 'Konservalia' olive, grown in pots in open field. The results showed that different mulch materials had different efficiency on soil water conservation and DOM and pistachio shell mulch PSM -as new mulch materials -seems more favourable for conserving soil water. Water stress caused reductions in all parameters measured and increment in leaf density compared with unstressed treatment. Olive plants grown using different soil mulch presented higher values of stem water potential, transpiration rate, stomatal conductance and Fv/Fm ratio compared to control plants. Although all the mulch treatments improved the water content of soil, DOM and PSM were found to be superior in maintaining optimum soil water content for olive use.

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Effects of gravel on grassland soil carbon and nitrogen in the arid regions of the Tibetan Plateau

Cited by 21 publications

References 44 publications

Fluvial sedimentary deposits as carbon sinks: organic carbon pools and stabilization mechanisms across a Mediterranean catchment

Fluvial sedimentary deposits as carbon sinks: organic carbon pools and stabilization mechanisms across a Mediterranean catchment

Sensitivity of soil organic carbon stocks and fractions to soil surface mulching in semiarid farmland

Evaluation of different mulch materials for reducing soil surface evaporation in semi‐arid region

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