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80 results for “nutrient limitations”
Data from: Nutrient limitation or home field advantage: does microbial community adaptation overcome nutrient limitation of litter decomposition in a tropical peatland?
Litter decomposition is an important control on carbon accumulation in tropical peatlands. Stoichiometric theory suggests that decomposition is regulated by elemental ratios in litter while the home field advantage (HFA) hypothesis predicts that decomposer communities are adapted to local conditions. To date, the relative importance of these contrasting theories for litter decomposition and therefore the carbon balance of tropical peatlands remain poorly understood. We conducted two in situ litter decomposition experiments in a lowland tropical peatland. The first experiment tested the importance of the stoichiometric theory using a factorial nutrient addition experiment at two sites with contrasting vegetation (Raphia taedigera and Campnosperma panamensis) to assess how nutrient addition affected microbial enzyme activity and litter mass loss at the peat surface and at 50 cm depth. The second experiment tested the importance of HFA by reciprocal translocation of leaf litter from R. taedigera and C. panamensis forests, which differed in both litter chemistry and soil nutrient availability, to separate the influence of litter chemistry and soil/site properties on litter mass loss. The activities of hydrolytic enzymes involved in the decomposition of large plant polymers were stimulated by nitrogen addition only where nitrogen availability was low relative to phosphorus, and were stimulated by phosphorus addition where phosphorus availability was low. The addition of nitrogen, but not phosphorus, increased leaf litter decomposition under waterlogged conditions at 50 cm depth, but not at the peat surface. Decomposition was greatest for autochthonous litter irrespective of site nutrient status, indicating that adaptation of the microbial community to low nutrients can partly overcome nutrient limitation, and suggesting that HFA can influence litter decomposition rates. Synthesis. Our study shows that leaf litter decomposition and the activity of microbial enzymes in tropical peatlands are constrained in part by nutrient availability. However, such nutrient limitation of litter decomposition can be overcome by adaptation of the microbial community.
Supported codes and data for "Hydrodynamic and biochemical impacts on the development of hypoxia in the Louisiana–Texas shelf Part 1: roles of nutrient limitation and plankton community"
<p>This dataset comprises matlab codes and truncated raw data from the Gulf-COAWST model hindcast over the northern Gulf of Mexico. The codes and data support the research presented in "Hydrodynamic and Biochemical Impacts on the Development of Hypoxia in the Louisiana–Texas Shelf Part 1: Roles of Nutrient Limitation and Plankton Community" and are organized by sections discussed in the paper.</p> <p>Readers can find the following figures and tables presented in the paper in the listed folders (highlighted by italic and bold font):</p> <p>Figure 2 in <strong><em>section2.3</em></strong></p> <p>Figure 3 in <strong><em>section3.2</em></strong></p> <p>Figures 4–5 in <strong><em>section3.3</em></strong></p> <p>Table 1 and Figure C2 in <strong><em>section3.4</em></strong></p> <p>Figure 6 in <strong><em>section3.5</em></strong></p> <p>Figure 7 in <strong><em>section3.6</em></strong></p> <p>Figures 8–9 and Table 2 in <strong><em>section3.7</em></strong></p> <p>Figures 10, 11, and C3 in <strong><em>section4.1</em></strong></p> <p>Figures 12, 13, 14, C4, and C5 in <strong><em>section4.2</em></strong></p> <p>Figures 15–17 in <strong><em>section4.3</em></strong></p> <p>Figure C1 in <strong><em>section_appendix</em></strong></p> <p>The grid file which is in the netCDF format is stored in folder <strong><em>grid</em></strong>. The folder <em><strong>matlab_toolbox</strong></em> is the toolbox needs for the data processing and figure plotting.</p>
Data from: Arbuscular mycorrhizal communities respond to nutrient enrichment and plant invasion in phosphorus-limited eucalypt woodlands
<p>Arbuscular mycorrhizal fungi (AMF) facilitate ecosystem functioning through provision of plant hosts with phosphorus (P), especially where soil P is limiting. Changes in soil nutrient regimes are expected to impact AMF, but the direction of the impact may depend on context. We predicted that nitrogen (N)-only enrichment promotes plant invasions and exacerbates their P limitation, increasing the utility of AMF and promoting AMF diversity. We expected that enrichment with N, P and other nutrients similarly promotes plant invasions, but decreases the benefit and diversity of AMF because P is readily available for both native and exotic plants. We tested these hypotheses in eucalypt woodlands of south-western Australia, that occur on soils naturally low in P. We evaluated AMF communities within three modified ground-layer states representing different types of nutrient enrichment and associated plant invasions. We compared these modified states to near-natural reference woodlands. AMF richness varied across ground-layer states. The moderately invaded/N-enriched state showed the highest AMF richness, while the highly invaded/NP-enriched state showed the lowest AMF richness. The reference state and the weakly invaded/enriched state were intermediate. AMF richness and colonisation were higher in roots of exotic than native plant species. AMF community composition differed among ground-layer states, with the highly invaded/NP-enriched state being most distinct. Distinctions among states were often driven by family-level patterns. Reference and moderately invaded/N-enriched states each supported distinct groups of zero-radius operational taxonomic units (zOTUs) in Acaulosporaceae, Gigasporaceae and Glomeraceae, whereas Gigasporaceae and Glomeraceae were nearly absent from the highly invaded/NP-enriched state. Further, Diversisporaceae and Glomeraceae were most diverse in the moderately invaded/N-enriched state.</p> <p> Synthesis. Both the nature of soil nutrient enrichment and plant provenance matter for AMF. N-only enrichment of low-P soils increased AMF richness, likely due to introduction of AMF-dependent exotic plant species and exacerbation of their P-limitation. In contrast, multi-nutrient enrichment, decreased AMF richness potentially due to a decrease in host dependence on AMF, regardless of host provenance. The changes in AMF community composition with nutrient enrichment and plant invasion warrants further research into predicting the functional implications of these changes.</p>
Experimental dataset for Liu et al. "Patterns of (micro)nutrient limitation across the South Pacific Ocean"
<p>Dataset of ocean nutrient addition bioassay experiments. Accompanies publication: 'Patterns of (micro)nutrient limitation across the South Pacific Ocean' by Liu et al.</p>
Data and R File - The Role of Nutrient and Energy Limitation on Microbial Decomposition of Deep Podzolized Carbon: A Priming Experiment
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Data for: Implications of plant N/P stoichiometry influenced by arbuscular mycorrhizal fungi for stability of plant species and community in response to nutrient limitation
<p>Arbuscular mycorrhizal fungi (AMF) influence plant nitrogen/phosphorus (N/P) by modifying plant N and P uptake, which further affects plant stoichiometric N/P homeostasis. Plant species and community stoichiometric N/P homeostasis can impact plant species and community stability, respectively, in response to variations of soil N and P availabilities. We investigated interspecific plant interactions via AMF in regard to plant and soil microbial N/P stoichiometry across different soil N and P availabilities induced by N and P addition (0 mg N kg<sup>-1</sup>, 25 mg N kg<sup>-1</sup>, 50 mg N kg<sup>-1</sup>, 30 mg P kg<sup>-1</sup>, and 100 mg P kg<sup>-1</sup>). We selected one dominant (<em>Bothriochloa ischaemum</em>; C4 grass) and one subordinate (<em>Lespedeza davurica</em>; legume) species in a natural grassland climax community. We examined how AMF influences stoichiometric N/P homeostasis in monoculture and mixed culture systems, and the resulting consequences for temporal stability of plant species and community in response to variations in soil N and P availability.</p> <p>The AMF mitigated the P limitation of soil microbial communities and decreased the degree of stoichiometric N/P homeostasis of host plants in monoculture. Through their resource-scavenging and soil organic matter mineralisation functions, AMF enhances plant 'luxury consumption', promoting species stability in monoculture in response to soil N and P availability variations. Compared with plants in monoculture, the interaction between <em>B. ischaemum</em> and <em>L. davurica</em> via AMF increased shoot N/P under soil N-poor conditions, leading to an enhanced degree of stoichiometric N/P homeostasis in both plant species, especially the legume.</p> <p>Our results suggest that interspecific plant interaction between C4 grass and legume mediated by AMF confers an advantage in complementarity in plant N acquisition under N-poor conditions, leading to increased stability of plant communities and better maintenance of subordinate species (legume) in response to soil N deficiency.</p>
Simulation data for "Impact of Dynamic Phytoplankton Stoichiometry on Global Scale Patterns of Nutrient Limitation, Nitrogen Fixation, and Carbon Export"
<p>Simulation data for our submission to GBC. Some of the files are compressed in order to minimize the size of the archive. Data files are stored as pickled python variables. The code for analysis of this data is in the github repository: https://github.com/georgehagstrom/BGCPaperFigureCode .</p>
Data from: Nutrient limitation or home field advantage: does microbial community adaptation overcome nutrient limitation of litter decomposition in a tropical peatland?
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Data from: Soil nutrients and dispersal limitation shape compositional variation in secondary tropical forests across multiple scales
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Data from: Simulated caribou browsing limits the effect of nutrient addition on the growth of Betula glandulosa, an expanding shrub species in Eastern Canada
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Data from: Expanding the toolbox of nutrient limitation studies: novel method of soil microbial in-growth bags to evaluate nutrient demands in tropical forests
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Data for: Implications of plant N/P stoichiometry influenced by arbuscular mycorrhizal fungi for stability of plant species and community in response to nutrient limitation
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Data from: Nitrogen transformations differentially affect nutrient-limited primary production in lakes of varying trophic state
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Data from: Seedling growth of savanna tree species from three continents under grass competition and nutrient limitation in a greenhouse experiment
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Data from: Nutrient limitation in tropical secondary forests following different management practices
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Data from: Arbuscular mycorrhizal communities respond to nutrient enrichment and plant invasion in phosphorus-limited eucalypt woodlands
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Data from: An assessment of carbon and nutrient limitations in the formation of the southern Andes treeline
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Data from: Functional groups, species, and light interact with nutrient limitation during tropical rainforest sapling bottleneck
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Data from: Tracing coco de mer’s reproductive history: pollen and nutrient limitation reduce fecundity
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Processes at the soil-root interface determine the different responses of nutrient limitation and metal toxicity in forbs and grasses to nitrogen enrichment
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International Brain Laboratory public data
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