Plant phosphorus‐use and ‐acquisition strategies in Amazonia

Reichert, Tatiana; Rammig, Anja; Fuchslueger, Lucia; Lugli, Laynara F.; Quesada, Carlos A.; Fleischer, Katrin

doi:10.1111/nph.17985

Cited by 66 publications

(52 citation statements)

References 222 publications

(390 reference statements)

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“…Previous studies have shown that root exudates play a decisive role in plant interactions [ 41 , 42 ]. It has been reported that flavonoids secreted by leguminous plants contribute to nitrogen fixation, and carboxylates to phosphorus acquisition [ 43 , 44 ]. Furthermore, allelopathic autotoxicity occurs due to some chemicals secreted by C. sativus itself, such as cinnamic acid [ 45 , 46 ].…”

Section: Discussionmentioning

confidence: 99%

Response of Cucumis sativus to Neighbors in a Species-Specific Manner

Zhang

Yan

2022

Plants

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Plants exhibit various behaviors of growth and allocation that play an important role in plant performance and social interaction as they grow together. However, it is unclear how Cucumis sativus plants respond to different neighbors. Here, we performed 5 neighbor combinations with C. sativus as the focal species. The selected materials of C. sativus responded to neighbors and exhibited different behavior strategies in a species-specific manner. All competition treatments reduced the growth of C. sativus seedlings to a certain extent, but only the Eruca sativa neighbor treatment reached a significant level in total root length and shoot biomass. Compared with growing under solitary conditions, focal plants avoided, tended to and did not change their allocation to their nearby plants. The larger the biomass of their neighbors, the stronger the inhibition of the focal plants. In addition, no significant correlations between growth and allocation variables were found, suggesting that growth and allocation are two important aspects of C. sativus behavioral strategies. Our findings provide reference and support for agricultural production of C. sativus, but further research and practice are still needed.

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Section: Discussionmentioning

confidence: 99%

Response of Cucumis sativus to Neighbors in a Species-Specific Manner

Zhang

Yan

2022

Plants

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“…The best soil variable in our model is soil phosphorus, a known limiting factor for Amazonian biomass productivity favoring better agricultural potential, higher near the Andes and lower in central and eastern Amazonia ( Reichert et al, 2022 ). Phosphorus is lowest for other archaeological sites perhaps pointing to its limiting factor in agricultural potential.…”

Section: Resultsmentioning

confidence: 99%

Predicting the geographic distribution of ancient Amazonian archaeological sites with machine learning

Walker

Ferguson

Olmeda

et al. 2023

PeerJ

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Amazonia has as least two major centers of ancient human social complexity, but the full geographic extents of these centers remain uncertain. Across the southern rim of Amazonia, over 1,000 earthwork sites comprised of fortified settlements, mound villages, and ditched enclosures with geometric designs known as geoglyphs have been discovered. Qualitatively distinct and densely located along the lower stretches of major river systems and the Atlantic coast are Amazonian Dark Earth sites (ADEs) with deep anthropogenic soils enriched by long-term human habitation. Models predicting the geographic extents of earthworks and ADEs can assist in their discovery and preservation and help answer questions about the full degree of indigenous landscape modifications across Amazonia. We classify earthworks versus ADEs versus other non-earthwork/non-ADE archaeological sites with multi-class machine learning algorithms using soils, climate, and distances to rivers of different types and sizes as geospatial predictors. Model testing is done with spatial cross-validation, and the best model at the optimal spatial scale of 1 km has an Area Under the Curve of 0.91. Our predictive model has led to the discovery of 13 new geoglyphs, and it pinpoints specific areas with high probabilities of undiscovered archaeological sites that are currently hidden by rainforests. The limited, albeit impressive, predicted extents of earthworks and ADEs means that other non-ADE/non-earthwork sites are expected to predominate most of Western and Northern Amazonia.

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“…Mechanisms to obtain P incur carbon costs (Raven et al, 2018; Reichert et al, 2022; Ryan et al, 2012). These range from the minimal costs associated with root hair formation, moderate costs associated with constructing and maintaining root systems of diverse morphology or architecture, to relatively high costs associated with supporting mycorrhizal symbioses and producing root exudates (Lynch & Ho, 2005; Raven et al, 2018; Reichert et al, 2022). Root exudates and root symbioses may each consume up to 25% of photosynthate production, depending on species (Wang & Lambers, 2019).…”

Section: Introductionmentioning

confidence: 99%

Plastic responses of below‐ground foraging traits to soil phosphorus‐rich patches across 17 coexisting AM tree species in a subtropical forest

et al. 2023

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Below‐ground plastic responses to soil nutrient ‘hot‐spots’ form a key nutrient foraging strategy of plants coexisting in natural ecosystems. However, it is unclear how plant species differ in these below‐ground plastic responses and how they covary. Plastic responses to soil phosphorus (P)‐rich patches of absorptive root, mycorrhizal, and exudation traits of 17 coexisting arbuscular mycorrhizal (AM) tree species in a subtropical evergreen broad‐leaved forest were investigated using a root bag method. There was considerable variation and heterogeneity in species‐specific responses to P‐rich patches. Negative log response ratios usually occurred for high‐cost traits and positive log response ratios for low‐cost traits. There were trade‐offs in the plastic responses between root acid phosphatase activity and extraradical hyphal length, which were unaffected by phylogeny, and between root acid phosphatase activity and specific root length. Thicker‐rooted species responded to P‐rich patches more through root exudation plasticity than mycorrhizal plasticity. Thinner‐rooted species relied more on mycorrhizal plasticity. Synthesis. Our results revealed diverse P foraging strategies comprising different combinations of plastic adjustments in absorptive root, mycorrhizal, and exudation traits among coexisting AM tree species, which suggest the potential for complementary exploitation of different soil P sources.

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Plant phosphorus‐use and ‐acquisition strategies in Amazonia

Cited by 66 publications

References 222 publications

Response of Cucumis sativus to Neighbors in a Species-Specific Manner

Response of Cucumis sativus to Neighbors in a Species-Specific Manner

Predicting the geographic distribution of ancient Amazonian archaeological sites with machine learning

Plastic responses of below‐ground foraging traits to soil phosphorus‐rich patches across 17 coexisting AM tree species in a subtropical forest

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