Quercus ilex forests are influenced by annual variations in water table, soil water deficit and fine root loss caused by Phytophthora cinnamomi

Corcobado, Tamara; Cubera, Elena; Moreno, Gerardo; Solla, Alejandro

doi:10.1016/j.agrformet.2012.09.017

Cited by 72 publications

(56 citation statements)

References 40 publications

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“…P N , g s and E were significantly reduced in infected 'Duke 7' plants as compared to control plants and could not recover to control levels, suggesting lower relative PRR tolerance in 'Duke 7' plants. This appears to be a general response to infection by P. cinnamomi as similar reductions in P N and g s have been noted in other species (Corcobado et al, 2013;Dinis et al, 2011). Infected 'Dusa™' and R0.06 plants in the shadehouse trial also showed recovery of P N , E, and g s to control levels after an initial decline (Fig.…”

Section: Discussionsupporting

confidence: 61%

Flooding and Phytophthora cinnamomi: Effects on photosynthesis and chlorophyll fluorescence in shoots of non-grafted Persea americana (Mill.) rootstocks differing in tolerance to Phytophthora root rot

Reeksting

Taylor

Berg

2014

South African Journal of Botany

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a b s t r a c tLosses in the production of avocado (Persea americana (Mill.)) are incurred due to Phytophthora root rot (PRR), a disease of the feeder roots that results in tree-dieback and eventual tree death. Avocado is also a flood-sensitive species and flooding exacerbates the effects of PRR. The avocado industry relies on the use of rootstocks tolerant to PRR to minimise losses. The present study compared the gas exchange and chlorophyll fluorescence responses of avocado rootstock plants of 'Dusa™', the current South African industry standard, with 'Duke 7', and the selections R0.12 and R0.06 which show reduced and superior tolerance to PRR, respectively. A decline in stomatal conductance (g s ) and net CO 2 assimilation (P N ) over the 30 day evaluation period were early responses to flooding. 'Dusa™', the more tolerant rootstock plants, demonstrated a better recovery in P N and g s in response to inoculation; however, both rootstocks performed poorly under flooded conditions. A decline in P N in infected 'Duke 7' plants appeared to be associated with stomatal limitations due to reduced stomatal conductance. The decline in P N and g s was not apparent in infected 'Dusa™' plants. Non-stomatal limitations to P N in rootstock plants exposed to flooding were also evident as indicated by increases in the ratio of internal to atmospheric CO 2 concentrations (C i /C a ). Impaired photosynthetic capacity in flooded rootstock plants was reflected by reduced photosystem II efficiency and photochemical quenching. In comparison to 'Dusa™', R0.12 rootstock plants showed reduced P N and g s following inoculation with Phytophthora cinnamomi whereas the more tolerant R0.06 rootstock plants revealed sustained photosynthetic activity. Interestingly R0.06 was the only rootstock able to maintain P N and g s in non-inoculated, flooded plants.

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Section: Discussionsupporting

confidence: 61%

Flooding and Phytophthora cinnamomi: Effects on photosynthesis and chlorophyll fluorescence in shoots of non-grafted Persea americana (Mill.) rootstocks differing in tolerance to Phytophthora root rot

Reeksting

Taylor

Berg

2014

South African Journal of Botany

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“…On a large scale, the temporal stability of SWC was the result of the interplay among climate, soil properties, and survey protocols (Hu et al, 2010a;Zhu et al, 2014). In the shallow groundwater area, the fluctuant water table had a significant influence on the variations of SWC (Leung et al, 2011;Corcobado et al, 2013). However, the effects of groundwater on temporal stability of SWC need further investigation.…”

Section: Introductionmentioning

confidence: 99%

Spatial-temporal variability of soil water content in a cropland-shelterbelt-desert site in an arid inland river basin of Northwest China

Shen

Gao

et al. 2016

Journal of Hydrology

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a b s t r a c tKnowledge of the spatial-temporal variability of soil water content (SWC) is critical for understanding a range of hydrological processes. In this study, the spatial variance and temporal stability of SWC were investigated in a cropland-shelterbelt-desert site at the oasis-desert ecotone in the middle of the Heihe River Basin, China. The SWC was measured on 65 occasions to a depth of 2.8 m at 45 locations during two growing seasons from 2012 to 2013. The standard deviation of the SWC versus the mean SWC exhibited a convex upward relationship in the shelterbelt with the greatest spatial variation at the SWC of around 22.0%, whereas a linearly increasing relationship was observed for the cropland, desert, and land use pattern. The standard deviation of the relative difference was positively linearly correlated with the SWC (p < 0.05) for the land use pattern, whereas such a relationship was not found in the three land use types. The spatial pattern of the SWC was more time stable for the land use pattern, followed by desert, shelterbelt, and cropland. The spatial pattern of SWC changed dramatically among different soil layers. The locations representing the mean SWC varied with the depth, and no location could represent the whole soil profile due to different soil texture, root distribution and irrigation management. The representative locations of each soil layer could be used to estimate the mean SWC well. The statistics of temporal stability of the SWC could be presented equally well with a low frequency of observation (30-day interval) as with a high frequency (5-day interval). Sampling frequency had little effect on the selection of the representative locations of the field mean SWC. This study provides useful information for designing the optimal strategy for sampling SWC at the oasis-desert ecotone in the arid inland river basin.

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“…Phytopthora can thrive in very moist soils and moderate to warm temperatures (Corcobado et al, 2013;McConnell and Balci, 2014), but also may become rare in drought conditions (Brouwers et al, 2013). Increasing climate variance, including excessive soil moisture either followed or preceded by drought contributes to the deleterious effect and the further advancement of this group of pathogens (DesprezLoustau et al, 2006).…”

Section: Soil Moisture and Forest Pathogensmentioning

confidence: 98%

More than Drought: Precipitation Variance, Excessive Wetness, Pathogens and the Future of the Western Edge of the Eastern Deciduous Forest

Hubbart

Guyette

Muzika

2016

Science of The Total Environment

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For many regions of the Earth, anthropogenic climate change is expected to result in increasingly divergent climate extremes. However, little is known about how increasing climate variance may affect ecosystem productivity. Forest ecosystems may be particularly susceptible to this problem considering the complex organizational structure of specialized species niche adaptations. Forest decline is often attributable to multiple stressors including prolonged heat, wildfire and insect outbreaks. These disturbances, often categorized as megadisturbances, can push temperate forests beyond sustainability thresholds. Absent from much of the contemporary forest health literature, however, is the discussion of excessive precipitation that may affect other disturbances synergistically or that might represent a principal stressor. Here, specific points of evidence are provided including historic climatology, variance predictions from global change modeling, Midwestern paleo climate data, local climate influences on net ecosystem exchange and productivity, and pathogen influences on oak mortality. Data sources reveal potential trends, deserving further investigation, indicating that the western edge of the Eastern Deciduous forest may be impacted by ongoing increased precipitation, precipitation variance and excessive wetness. Data presented, in conjunction with recent regional forest health concerns, suggest that climate variance including drought and excessive wetness should be equally considered for forest ecosystem resilience against increasingly dynamic climate. This communication serves as an alert to the need for studies on potential impacts of increasing climate variance and excessive wetness in forest ecosystem health and productivity in the Midwest US and similar forest ecosystems globally.

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Quercus ilex forests are influenced by annual variations in water table, soil water deficit and fine root loss caused by Phytophthora cinnamomi

Cited by 72 publications

References 40 publications

Flooding and Phytophthora cinnamomi: Effects on photosynthesis and chlorophyll fluorescence in shoots of non-grafted Persea americana (Mill.) rootstocks differing in tolerance to Phytophthora root rot

Flooding and Phytophthora cinnamomi: Effects on photosynthesis and chlorophyll fluorescence in shoots of non-grafted Persea americana (Mill.) rootstocks differing in tolerance to Phytophthora root rot

Spatial-temporal variability of soil water content in a cropland-shelterbelt-desert site in an arid inland river basin of Northwest China

More than Drought: Precipitation Variance, Excessive Wetness, Pathogens and the Future of the Western Edge of the Eastern Deciduous Forest

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