Soil Enzyme Activity in a Mediterranean Forest after Six Years of Drought

Sardans, Jordi; Peñuelas, Josep

doi:10.2136/sssaj2009.0225

Cited by 73 publications

(50 citation statements)

References 51 publications

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“…Water availability was not only associated with shifts in nutrient concentrations but also with their allocation to different organs [41,44], the stoichiometric relationships among the main nutrients [41,44,45] and the distribution of nutrients between plant and soil [43,[45][46][47]. Drought tends to decrease total nutrient contents in plant-soil systems, mainly in plants, that transfer nutrients from above-to belowground biomass and from plant to soil [44,48]. This modification of the biogeochemical cycles of the plant-soil system in response to environmental changes constitute a first step towards an altered flow of matter and nutrients through the trophic chain [38].…”

Section: Responses At the Molecular Level And In The Use Of Chemical mentioning

confidence: 99%

“…Drought also induced changes in the allocation of N to roots, probably to help meet the increased need for water [133]. Field experiments simulating climate change have demonstrated that drought has large impacts on soil traits, particularly C and nutrient status [48,134,135]. These experiments have found that soil respiration and the activities of soil and rhizospheric enzymes have been strongly and negatively affected by drought [48,134,135].…”

Section: Biogeochemical and Ecosystem Responsesmentioning

confidence: 99%

“…Field experiments simulating climate change have demonstrated that drought has large impacts on soil traits, particularly C and nutrient status [48,134,135]. These experiments have found that soil respiration and the activities of soil and rhizospheric enzymes have been strongly and negatively affected by drought [48,134,135]. A decrease in soil enzymatic activity was directly correlated with soil water content [48].…”

Section: Biogeochemical and Ecosystem Responsesmentioning

confidence: 99%

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Impacts of Global Change on Mediterranean Forests and Their Services

Peñuelas

Sardans

Filella

et al. 2017

Forests

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128

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The increase in aridity, mainly by decreases in precipitation but also by higher temperatures, is likely the main threat to the diversity and survival of Mediterranean forests. Changes in land use, including the abandonment of extensive crop activities, mainly in mountains and remote areas, and the increases in human settlements and demand for more resources with the resulting fragmentation of the landscape, hinder the establishment of appropriate management tools to protect Mediterranean forests and their provision of services and biodiversity. Experiments and observations indicate that if changes in climate, land use and other components of global change, such as pollution and overexploitation of resources, continue, the resilience of many forests will likely be exceeded, altering their structure and function and changing, mostly decreasing, their capacity to continue to provide their current services. A consistent assessment of the impacts of the changes, however, remains elusive due to the difficulty of obtaining simultaneous and complete data for all scales of the impacts in the same forests, areas and regions. We review the impacts of climate change and other components of global change and their interactions on the terrestrial forests of Mediterranean regions, with special attention to their impacts on ecosystem services. Management tools for counteracting the negative effects of global change on Mediterranean ecosystem- services are finally discussed.

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Section: Responses At the Molecular Level And In The Use Of Chemical mentioning

confidence: 99%

Section: Biogeochemical and Ecosystem Responsesmentioning

confidence: 99%

Section: Biogeochemical and Ecosystem Responsesmentioning

confidence: 99%

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Impacts of Global Change on Mediterranean Forests and Their Services

Peñuelas

Sardans

Filella

et al. 2017

Forests

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128

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“…1). These effects are due most frequently to the decrease in soil moisture (Sardans et al, 2008a;Sardans and Peñuelas, 2010) but also to decreases in food quality and the nutrient contents of leaves and litter (Sardans et al, 2008d;Matías et al, 2011). These effects frequently lead to increases in recalcitrant forms of soil nutrients and decreases in forms available to plants (Sardans and Peñuelas, 2004;Sardans et al, 2006Sardans et al, , 2008d.…”

Section: Effects On the Availability And Stoichiometry Of Nutrients Amentioning

confidence: 99%

The Role of Plants in the Effects of Global Change on Nutrient Availability and Stoichiometry in the Plant-Soil System

2012

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“…At the same time, desiccation tolerance mechanisms could trade off against other aspects of physiology (Raven, 1985;Schimel et al, 2007). For example, microbial taxa that survive better under drought might have lower growth efficiency due to increased metabolic costs (Killham and Firestone, 1984a) or fewer resources to invest in enzymatic machinery (Sardans and Peñuelas, 2010).…”

Section: Introductionmentioning

confidence: 99%

Consequences of drought tolerance traits for microbial decomposition in the DEMENT model

Allison

Goulden

2017

Soil Biology and Biochemistry

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The frequency and intensity of drought are expected to increase in the future, yet the consequences for soil microbial communities and functioning remain unclear. Processes such as decomposition could be maintained if microbial communities become more drought tolerant. However, increased drought tolerance might involve physiological costs with uncertain consequences for ecosystem processes. Here we used the trait-based model DEMENT to quantify the sensitivity of microbial traits, community dynamics, and litter decomposition to variation in drought tolerance costs. These costs were imposed as a physiological tradeoff between drought tolerance and carbon use efficiency. We ran simulations across a range of drought tolerance costs and with climate forcing from ambient and drought treatments in a Southern California grassland that experiences seasonal summer drought. As expected, zero or low costs of tolerance allowed droughttolerant taxa to increase in abundance under ambient simulation conditions. More drought tolerant communities had greater microbial biomass but lower extracellular enzyme investment due to biological feedbacks involving enzyme production. These two responses counteracted one another, leaving decomposition unchanged relative to virtual microbial communities with no drought tolerance. Simulated decomposition rates were one-third lower under drought treatment, but there were no differences in microbial drought tolerance compared to simulations forced with ambient climate. This model result suggests that seasonal drought is a more important environmental filter than reduced precipitation during the wet season in our Mediterranean climate system. Overall, our simulations indicate that microbial community responses to drought are not likely to increase decomposition rates, even if CUE costs are low. Using the simulation approach described

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Soil Enzyme Activity in a Mediterranean Forest after Six Years of Drought

Cited by 73 publications

References 51 publications

Impacts of Global Change on Mediterranean Forests and Their Services

Impacts of Global Change on Mediterranean Forests and Their Services

The Role of Plants in the Effects of Global Change on Nutrient Availability and Stoichiometry in the Plant-Soil System

Consequences of drought tolerance traits for microbial decomposition in the DEMENT model

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