Seasonal effects of altered precipitation regimes on ecosystem-level CO2 fluxes and their drivers in a grassland from Eastern Australia

Arca, Valentina; Power, Sally A.; Delgado‐Baquerizo, Manuel; Pendall, Elise; Ochoa‐Hueso, Raúl

doi:10.1007/s11104-020-04811-x

Cited by 16 publications

(7 citation statements)

References 57 publications

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“…These often focus on the role of antecedent precipitation on carbon fluxes and growth. For instance, intra-annual rainfall patterns can be of greater importance to grassland biomass than total annual rainfall (Hovenden et al, 2014(Hovenden et al, , 2018(Hovenden et al, , 2019 while the same amount of precipitation received in fewer events can reduce terrestrial carbon uptake (Arca et al, 2021). Precipitation deficits experienced at different times of the year have varying impacts on future growth (Alves et al, 2020;Hahn et al, 2021;Huang et al, 2018Huang et al, , 2021, while some plants can acclimate to multiple droughts within the same growing season (Lemoine et al, 2018).…”

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confidence: 99%

Non‐Stationary Lags and Legacies in Ecosystem Flux Response to Antecedent Rainfall

et al. 2023

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confidence: 99%

Non‐Stationary Lags and Legacies in Ecosystem Flux Response to Antecedent Rainfall

et al. 2023

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“…We also found that the effects of IPVI on soil properties were different between arid and humid regions, even though IPVI generally did not alter topsoil water availability. IPVI may increase the variability of topsoil water availability without changing its mean value during a growing season in arid and mesic grasslands (Arca et al, 2021; Hou et al, 2021; Knapp, 2001; Post et al, 2020). However, in mesic grasslands, prolonged drought may increase the risk of water loss due to surface soil evaporation and run‐off (Knapp et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Divergent responses of grassland productivity and plant diversity to intra‐annual precipitation variability across climate regions: A global synthesis

Zhang

2023

Journal of Ecology

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Global warming intensifies the hydrological cycle and may result in changes in the frequency and intensity of precipitation events. However, a knowledge gap still exists about the general influences of intra‐annual precipitation variability on grassland plant diversity and ecosystem function at the global scale. Here, we synthesized field manipulative experiments from 66 publications to quantify the effects of intra‐annual precipitation variability increases (IPVI) on community biomass and plant diversity in grasslands worldwide. At the global scale, we found that IPVI generally increased grassland community above‐ground biomass (AGB) by 6.90%, and decreased grass biomass and soil ammonium content by 10.38% and 25.35% respectively. IPVI increased and decreased total AGB in arid and humid regions, respectively, and IPVI enhanced grassland below‐ground biomass and plant species richness in arid regions, but showed no effect in humid regions. Furthermore, moderate IPVI stimulated plant species richness and community biomass in arid grasslands, while extreme IPVI impaired them in mesic grasslands. Changes in total AGB under IPVI were related to changes in the biomass of plant functional groups, species richness and soil moisture. Structural equation modelling demonstrated that climate conditions (mean annual temperature and mean annual precipitation) and background soil properties (soil sand content and soil organic carbon content) jointly regulated grassland total AGB responses to IPVI across climate regions. Synthesis. Overall, our study shows divergent responses of grassland productivity and diversity to IPVI in arid and humid regions. Accounting for climate, edaphic properties and precipitation variability can help improve our ability to predict the responses of grassland ecosystems to future changes in precipitation at global scales.

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“…We undertook whole‐plant gas exchange measurements of net ecosystem production and autotrophic respiration in each pot on Days 7 and 28 after initiating the drought treatment (before the mid‐point harvest) and on Day 33 of the regrowth phase using a Li‐Cor 7500 open‐path infrared gas analyser (IRGA; Li‐Cor) and established methods (Arca et al, 2021). The IRGA was placed inside a cylindrical transparent Lexan polycarbonate (GE Plastics) static chamber (48 cm height x 19.5 cm diameter), equipped with an internal fan to ensure adequate mixing of air and a thermocouple to record air temperature during measurements.…”

Section: Methodsmentioning

confidence: 99%

Drought and warming alter gross primary production allocation and reduce productivity in a widespread pasture grass

Chandregowda

Tjoelker

Power

et al. 2022

Plant Cell & Environment

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Carbon allocation determines plant growth, fitness and reproductive success.However, climate warming and drought impacts on carbon allocation patterns in grasses are not well known, particularly following grazing or clipping. A widespread C 3 pasture grass, Festuca arundinacea, was grown at 26 and 30°C in controlled environment chambers and subjected to drought (65% reduction relative to wellwatered controls). Leaf, root and whole-plant carbon fluxes were measured and linked to growth before and after clipping. Both drought and warming reduced gross primary production and plant biomass. Drought reduced net leaf photosynthesis but increased the leaf respiratory fraction of assimilated carbon. Warming increased root respiration but did not affect either net leaf photosynthesis or leaf respiration. There was no evidence of thermal acclimation. Moreover, root respiratory carbon loss was amplified in the combined drought and warming treatment and, in addition to a negative carbon balance aboveground, explained an enhanced reduction in plant biomass. Plant regrowth following clipping was strongly suppressed by drought, reflecting increased tiller mortality and exacerbated respiratory carbon loss. These findings emphasize the importance of considering carbon allocation patterns in response to grazing or clipping and interactions with climatic factors for sustainable pasture production in a future climate.

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Seasonal effects of altered precipitation regimes on ecosystem-level CO2 fluxes and their drivers in a grassland from Eastern Australia

Cited by 16 publications

References 57 publications

Non‐Stationary Lags and Legacies in Ecosystem Flux Response to Antecedent Rainfall

Non‐Stationary Lags and Legacies in Ecosystem Flux Response to Antecedent Rainfall

Divergent responses of grassland productivity and plant diversity to intra‐annual precipitation variability across climate regions: A global synthesis

Drought and warming alter gross primary production allocation and reduce productivity in a widespread pasture grass

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