Particulate organic carbon is a sensitive indicator of soil degradation related to overgrazing in Patagonian wet and mesic meadows

Enriquez, Andrea Soledad; Cremona, María Victoria

doi:10.1007/s11273-017-9577-4

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…Some previous studies have demonstrated that grazing is not conducive to the maintenance of vegetation productivity in degraded grasslands (Enriquez & Cremona, 2017;Pan et al, 2017). Grazing also leads to the destruction and trampling of grassland vegetation ( Cao et al, 2019;Wu et al, 2017), thereby further generating drying and impoverishment of soil (Dlamini et al, 2016;Du et al, 2020;Novikoff, 1983).…”

Section: Fencing Improved Ecosystem Service Benefit and Reduced Lives...mentioning

confidence: 99%

Linking ecosystem service benefit and grazing prohibition intensity can better optimize fence layout in northern Tibet

et al. 2023

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There is an urgent need to link grazing exclusion policy and the resulting benefits for fence layout management. However, policy implementation intensity and benefits are rarely considered together. Here, combining the changes in the rate of the livestock and fenced area, we constructed a grazing prohibition intensity (GPI) index that reflected the intensity of policy implementation. We also quantified ecosystem service benefits (ESBs), including net primary productivity (NPP) and soil conservation by the different models. Then, a new perspective in combination with ESBs and GPI was used to assess whether a fence layout is appropriate using the four–quadrant model and how to optimize a potentially unreasonable fence layout based on seven drivers. We found that the NPP and soil conservation service notably increased by 59% and 87%, respectively, in the total fenced area, after the implementation of the grazing exclusion program. The high values of ESBs and GPI were concentrated in the eastern and central‐eastern regions of the northern Tibet, respectively. Moreover, the potentially unreasonable fence layout accounted for 10% of the total fenced area, and was focused on meadow areas with a high human footprint. The area proportion of reasonable fence layout coupling ESBs and GPI increased by 20% compared with ESBs individually. Finally, an optimal potential unreasonable fence layout might reduce the mismatch between the ESB and GPI by considering countermeasures such as attention to the potential unreasonable fence layout, setting a target for supplying carbon sinks and soil and water conservation quantities and reducing the human footprint. Our study indicates the necessity of linking ESBs and GPI for fence layout management.

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Section: Fencing Improved Ecosystem Service Benefit and Reduced Lives...mentioning

confidence: 99%

Linking ecosystem service benefit and grazing prohibition intensity can better optimize fence layout in northern Tibet

et al. 2023

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“…Although there is little information on the biochemical recalcitrance of organic carbon, the changes in LF I concentration during wetland degradation were consistent with those of other active organic compounds with similar carbohydrate components. For instance, Huo et al (2013) and Gao et al (2014) reported that the concentrations of light fraction C and soluble organic C decreased significantly as a marsh was degraded lightly or moderately, Enriquez and Cremona (2018) claimed that meadow overgrazing decreased the concentration of particulate organic C in Patagonia, and Liu et al (2017) found that land reclamation decreased the LOC concentration in wet meadows in the Ili River valley, China.…”

Section: Effects Of Marsh Degradation On the Concentrations Of Soc Frmentioning

confidence: 99%

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Zhang

et al. 2020

J Soil Sci Plant Nutr

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Soil organic carbon (SOC) fractions play a crucial role in the carbon cycle of alpine wetland ecosystems and regional climate regulation. In the last decades, alpine marshes at Tibetan Plateau have undergone increased degradation. The effects of marsh degradation on soil labile and recalcitrant organic carbon fractions and on SOC stability remain unclear. In this study, we investigated changes in SOC fractions with different biochemical recalcitrance and stability in the marsh ecosystems with various levels of degradation in the Zoige Wetland, Eastern Qinghai-Tibet Plateau. Soil samples of relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), heavily degraded marsh (HDM) and severely degraded marsh (SDM) were collected and analysed using the acid hydrolysis method. Compared with RPM, the concentrations of SOC labile fraction I (non-cellulosic polysaccharides), SOC labile fraction II (cellulose) and recalcitrant organic carbon (ROC) in degraded marshes decreased significantly: 29-97, 38-95 and 32-99%, respectively, except for the LDM. The SOC recalcitrance index (RIc) in the HDM and SDM was significantly lower than that in RPM by 11-35 and 15-47%, respectively; compared with RPM, the stability of organic carbon was significantly lower in the HDM and SDM. Additionally, the marsh degradation increased vertical variation in the concentrations of SOC fractions. The degradation of alpine marshes decreases the capacity for carbon (C) sequestration via decreasing the resistance of SOC to biodegradation, indicating that the alpine marsh degradation may weaken the carbon sink capacity of the Zoige Plateau, thus aggravating the global greenhouse effect. Keywords Zoige. Marsh degradation. Labile organic carbon. Recalcitrant organic carbon. Soil organic carbon stability Highlights • Concentrations of labile and recalcitrant SOC decreased with marsh degradation. • Vertical variation in labile and recalcitrant SOC increased in degraded marshes. • Resistance of SOC to biodegradation decreased after marsh was moderately degraded. • Marsh degradation reduced the capacity of SOC sequestration.

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“…En este contexto, los mallines de valle asociados a cursos de régimen nival o nivopluvial se caracterizan por una recarga del perfil edáfico que ocurre, en general, en el período otoño-primavera, momento de balances hídricos positivos, mayores caudales en cursos naturales y mayor precipitación efectiva y fusión de nieves estacionales, y también por un balance hídrico estival deficitario (Cremona et al 1996;Peri and Monelos 1997;Horne 2010;Díaz, comunicación personal). El sobrepastoreo de los mallines disminuye la cobertura vegetal y aumenta el suelo desnudo (Bonvisutto et al 2008;Suárez et al 2010), reduce la producción forrajera del pastizal y el contenido del carbono orgánico edáfico total (Enriquez et al 2015) y particulado (Enriquez and Cremona 2018), y favorece la salinización y la evaporación del agua (Bonvisutto et al 1992;Del Valle 1993). Además, en condiciones húmedas, la presión de pastoreo elevada genera una compactación del suelo por pisoteo animal; esto resulta en aumentos en la densidad volumétrica (Enriquez et al 2015) y en procesos de erosión hídrica de distinto tipo e intensidad (Del Valle 1993;Bonvisuto et al 2008).…”

Section: I��unclassified

“…Con relación al contenido de Materia Orgánica (MO), la declinación del parámetro según el avance de la condición de degradación coincide con estudios en humedales de Norte-América sometidos a pastoreos intensivos (Belsky et al 1999) y podría relacionarse con una menor aireación e infiltración hídrica, en virtud de la compactación del suelo por el pisoteo animal (Wilkins and Garwood 1986) relevada en los sitios con deterioro severo, y que estarían condicionando la descomposición de los restos vegetales de la MO. A su vez, el sobrepastoreo a largo plazo de estos ambientes reduce el contenido de carbono orgánico edáfico total, en virtud de una disminución en la biomasa aérea y subterránea de la vegetación (Enriquez et al 2015), y en la acumulación del carbono orgánico particulado proveedor de la MO más lábil (Enriquez and Cremona 2018).…”

Section: Variables Físicas Y Químicas Del Suelounclassified

Evaluación de indicadores de degradación y biomasa radical en mallines de una cuenca hídrica del sur de Santa Cruz

et al. 2020

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Particulate organic carbon is a sensitive indicator of soil degradation related to overgrazing in Patagonian wet and mesic meadows

Cited by 16 publications

References 23 publications

Linking ecosystem service benefit and grazing prohibition intensity can better optimize fence layout in northern Tibet

Linking ecosystem service benefit and grazing prohibition intensity can better optimize fence layout in northern Tibet

Response of the Organic Carbon Fractions and Stability of Soil to Alpine Marsh Degradation in Zoige, East Qinghai-Tibet Plateau

Evaluación de indicadores de degradación y biomasa radical en mallines de una cuenca hídrica del sur de Santa Cruz

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