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8 results for “Nutrient conservation”
Temperature drives the coordination between aboveground nutrient conservation and belowground nutrient acquisition in alpine coniferous forests
<p><span>Aboveground nutrient conservation via resorption processes and belowground nutrient acquisition from soils are two important mechanisms for plants to maintain nutrition and ecosystem functions. However, </span><span>the mechanism by which plants coordinate these two nutrient strategies</span><span>, especially for ectomycorrhizal (ECM)-dominated conifers in alpine forests, remains unclear.</span></p> <p><span>We investigated the relationships between aboveground nutrient conservation and belowground nutrient acquisition and their environmental drivers by measuring leaf </span><span>nutrient (i.e., nitrogen [N] and phosphorous [P]) resorption efficiency, resource foraging- and uptake-related </span><span>root morphological </span><span>(root diameter [RD], specific root length [SRL]/area [SRA])</span><span> and physiological </span><span>(root tissue density [RTD], root N and P concentration)</span><span> traits</span><span>, mycorrhizal colonization rate (MCR), rhizosphere effect on soil N and P cycling, and environmental factors of 40 ECM coniferous populations on the eastern Tibetan Plateau, China.</span></p> <p><span>Our results show that w</span><span>ith increasing leaf </span><span>nutrient (N and P) resorption efficiency</span><span>, conifers shifted from depending on the 'outsourcing' strategy by mycorrhizal fungi (high MCR) to relying on the 'do-it-yourself' strategy of root mining (high rhizosphere effect on N- and P-mining</span><span>-</span><span>related enzyme activities) rather than on root foraging (high SRL and SRA) and </span><span>preferred</span><span> more conservative roots (high RTD and low root N and P concentrations). </span><span>Temperature was the main factor driving a negative relationship of ECM fungi foraging, root uptake and a positive relationship of root mining with leaf nutrient resorption</span><span>,</span><span> while precipitation resulted in a decoupled relationship between root foraging and leaf nutrient resorption.</span></p> <p><span>Our findings</span> <span>demonstrate temperature-driven and diverse </span><span>collaborations</span><span> (e.g., tradeoff or synergy) between </span><span>belowground nutrient acquisition</span><span> and </span><span>aboveground nutrient conservation strategies</span><span> in alpine ECM conifers and</span><span> highlight that </span><span>the preference </span><span>for</span><span> belowground nutrient acquisition strategies could influence </span><span>the aboveground </span><span>nutrient utilization strategy. This is insightful for a holistic understanding of the adaptation and responses of alpine forests to climatic change.</span></p>
Temperature drives the coordination between aboveground nutrient conservation and belowground nutrient acquisition in alpine coniferous forests
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Data from: Tree species with conservative foliar nutrient status and strong phosphorus homeostasis are regionally abundant in subtropical forests
<p><span>Foliar </span><span>nitrogen (N) or phosphorus <em>(P)</em> </span><span>status and their </span><span>stoichiometric homeostasis </span><span>are integral parts of the plant nutrient economy </span><span>that determines the success of plant species</span><span> in environments where N or P limits plant growth. </span><span>Despite growing evidence </span><span>for higher predictability of </span><span>stoichiometric </span><span>homeostasis </span><span>of N</span><span> (</span><em><span>H</span></em><sub><span>N</span></sub><span>) than that of P (</span><em><span>H</span></em><sub><span>P</span></sub><span>) on plant species abundance</span><span> in temperate grasslands</span><span>, no previous studies e</span><span>xplicitly examined how foliar N and P status modulate the relationships between </span><span>stoichiometric </span><span>homeostasis and</span><span> species distribution (regional species abundance)</span><span> of woody plants, especially in P-limited (sub)-tropical ecosystems. W</span><span>e hypothesized that species with a conservative foliar nutrient status but a higher </span><em><span>H</span></em><sub><span>P</span></sub><span> (but not</span><span> <em>H</em><sub>N</sub></span><span>) would be regional abundant in </span><span>P-limited</span><span> forest.</span></p> <p><span>We measured foliar N (LNC) and P (LPC) contents of 54 woody species, community composition and soil N and P </span><span>contents across</span><span> 94 forest plots in Chinese subtropical forests. Then we evaluated the species' levels of N and P </span><span>stoichiometric homeostasis</span><span> and their regional abundance to test our hypotheses.</span></p> <p><span><em><span>H</span></em><sub><span>N</span></sub><span> and <em>H</em><sub>P</sub> significantly increased with decreasing LNC and LPC. Foliar nutrient status positively correlated </span><span>with the minimum values of both soil N and P contents, but only negatively associated with the maximum value </span><span>of soil P content, </span><span>indicating that conservative species can occupy a wider range of soil P- than N-based nutrient niche.</span><span> Meanwhile, species abundance negatively correlated with LNC and LPC, and positively correlated with <em><span>H</span></em><sub><span>N</span></sub><span> and <em>H</em><sub>P</sub></span>. However, the structure equation model analysis showed that species abundance increased with decline of LNC but not yet with increased HN. In contrast, species abundance enhanced with increased <span><em>H</em><sub>P</sub> </span>and decreased LPC via <em><span>H</span></em><sub><span>N</span></sub>, rather than directly with a decline of LPC.</span></span></p> <p><span><strong>Synthesis</strong>.</span><span> This study provides empirical evidence that species with conservative foliar nutrient status are more stable in terms of N and P stoichiometric homeostasis, and foliar N and P economy modulate species abundance distribution in different ways. Our results suggest that maintaining strong stoichiometric homeostasis of leaf P, while maintaining conservative economy of N, is a key physiochemical mechanism for shaping species abundance distribution in P-limited forests.</span></p>
Data from: Tree species with conservative foliar nutrient status and strong phosphorus homeostasis are regionally abundant in subtropical forests
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Supplementary material 2 from: Pulina S, Lugliè A, Mariani MA, Sarria M, Sechi N, Padedda BM (2019) Multiannual decrement of nutrient concentrations and phytoplankton cell size in a Mediterranean reservoir. In: Mazzocchi MG, Capotondi L, Freppaz M, Lugliè A, Campanaro A (Eds) Italian Long-Term Ecological Research for understanding ecosystem diversity and functioning. Case studies from aquatic, terrestrial and transitional domains. Nature Conservation 34: 163-191. https://doi.org/10.3897/natureconservation.34.30116
: Data type: multimedia
Supplementary material 1 from: Pulina S, Lugliè A, Mariani MA, Sarria M, Sechi N, Padedda BM (2019) Multiannual decrement of nutrient concentrations and phytoplankton cell size in a Mediterranean reservoir. In: Mazzocchi MG, Capotondi L, Freppaz M, Lugliè A, Campanaro A (Eds) Italian Long-Term Ecological Research for understanding ecosystem diversity and functioning. Case studies from aquatic, terrestrial and transitional domains. Nature Conservation 34: 163-191. https://doi.org/10.3897/natureconservation.34.30116
: Data type: multimedia
Network of nutrient sensing pathways and a conserved kinase cascade integrates osmolarity and carbon sensing in Neurospora crassa
GEO Series GSE95681. Neurospora crassa. 42 samples. Type: Expression profiling by high throughput sequencing.
Conserved nutrient sensor O-GlcNAc transferase is integral to the C. elegans pathogen-specific immune response
GEO Series GSE53732. Caenorhabditis elegans. 36 samples. Type: Expression profiling by array.
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