Climate warming negates arbuscular mycorrhizal fungal reductions in soil phosphorus leaching with tall fescue but not lucerne

Zhang, Haiyang; Powell, Jeff R.; Plett, Jonathan M.; Churchill, Amber C.; Power, Sally A.; Macdonald, Catriona A.; Jacob, Vinod; Kim, Gil Won; Pendall, Elise; Tissue, David T.; Catunda, Karen L. M.; Igwenagu, Chioma; Carrillo, Yolima; Moore, Ben D.; Anderson, Ian C.

doi:10.1016/j.soilbio.2020.108075

Cited by 17 publications

(22 citation statements)

References 43 publications

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“…Plant shoots were clipped 8 weeks after planting (before imposing the drought treatment) at 5 cm above the soil surface, and allowed to regrow until the final harvest. Two weeks after the clipping, we applied fertilizer (containing KNO 3 and KH 2 PO 4 resulting in a fertilizer pulse of 30 kg N ha -1 and 5 kg P ha -1 ; Zhang et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…Treatment replicates were divided evenly among four chambers, with two chamber replicates maintained at aT and the other two at eT. Watering regimes were nested within the temperature treatments (Zhang et al, 2021). Pot positions within chambers were re-randomized every two weeks to minimize potential within-chamber effects.…”

Section: Site and Experimental Designmentioning

confidence: 99%

“…Seeds of each species were surface-sterilized with a 1.25% NaOCl for 10 min, rinsed with deionized water 10 times and germinated in Petri dishes with sterilized water for 1 week. Five germinated seedlings were transplanted into each pot and then thinned to four healthy individuals per pot after 2 weeks (Zhang et al, 2021). The legume pots were supplied with appropriate rhizobia (Easy Rhiz soluble legume inoculant, Group AL, New Edge Microbials, NSW, Australia) necessary for nodulation (Zhang et al, 2021 The temperature treatments included an ambient regime (aT; target of 26/18 °C day/night) and an elevated temperature regime (warming) with + 4 °C warming (eT; target of 30/22 °C day/night) using a 15:9 light: dark cycle.…”

Section: Plant Growth Conditions and Treatmentsmentioning

confidence: 99%

“…Five germinated seedlings were transplanted into each pot and then thinned to four healthy individuals per pot after 2 weeks (Zhang et al, 2021). The legume pots were supplied with appropriate rhizobia (Easy Rhiz soluble legume inoculant, Group AL, New Edge Microbials, NSW, Australia) necessary for nodulation (Zhang et al, 2021 The temperature treatments included an ambient regime (aT; target of 26/18 °C day/night) and an elevated temperature regime (warming) with + 4 °C warming (eT; target of 30/22 °C day/night) using a 15:9 light: dark cycle. The ambient regime reflected the average daily maximum temperature for the site over the previous 20 years (Australian Government Bureau of Meteorology, Richmond RAAF site), and the elevated regime represented the predicted increase of 4 °C for this region within this century (Pearce et al, 2007).…”

Section: Plant Growth Conditions and Treatmentsmentioning

confidence: 99%

“…Temperature treatments were initiated at the same time as transplantation. Humidity was controlled at 60% and the effectiveness for achieving the temperature conditions within the glasshouse chambers are reported in Zhang et al (2021).…”

Section: Plant Growth Conditions and Treatmentsmentioning

confidence: 99%

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Drought is a stronger driver of plant morphology and nutritional composition than warming in two common pasture species

Catunda

Churchill²,

Zhang³

et al. 2021

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Under warmer and drier future conditions, global livestock and dairy production are threatened by impacts on the productivity and nutritional quality of pastures. However, morphological and nutritional adjustments within plants in response to warming and drought vary among species and less is known how these relate to production and forage quality. To investigate this, we grew two common pasture species, tall fescue (Festuca arundinacea: grass) and lucerne (Medicago sativa: legume), in a climate-controlled facility, under different temperatures (ambient and elevated) and watering regimes (well-watered and droughted). We found that drought had a strong negative impact on biomass production, morphology and nutritional quality while warming only significantly affected both species when response metrics were considered in concert, although to a lesser degree than the drought. Furthermore, interactions between warming and drought were only seen for lucerne, with the greatest reduction in biomass and most dead material and dry matter content. In tall fescue, drought had bigger impacts on nutritional composition than morphological traits, while in lucerne, drought affected all morphological traits and most nutritional parameters. These findings suggest that in future climate scenarios, drought may be a stronger driver of changes in the morphology and nutritional composition of pasture grasses and legumes, compared to modest levels of warming.

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Section: Methodsmentioning

confidence: 99%

Section: Site and Experimental Designmentioning

confidence: 99%