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4,568 results for “planting year”
Year 2007, Plant species present along vegetation transects off the marsh on Middle Rd, Newbury, MA. Near Thurlow's Bridge and Governor's Academy.
This study was conducted in the Fall of 2007, by Governor's Academy high school science class students with their teacher Susan Olezsko-Zsuts to look at the annual presence and absence of marsh plants in the tidal marsh near the Governor's Academy school campus. The marsh is brackish and is located off Middle Road in Newbury , MA , near Thurlow's Bridge.
Year 2009, Plant species present along vegetation transects off the marsh on Middle Rd, Newbury, MA. Near Thurlow's Bridge and Governor's Academy.
This study was conducted in the Fall of 2009, by Governor's Academy high school science class students with their teacher Susan Olezsko-Zsuts to look at the annual presence and absence of marsh plants in the tidal marsh near the Governor's Academy school campus. The marsh is brackish and is located off Middle Road in Newbury , MA , near Thurlow's Bridge.
Data from: Species abundance fluctuations over 31 years are associated with plant-soil feedback in a species-rich mountain meadow
<p>1. Increasing evidence suggest that plant-soil interactions play an essential role in plant community assembly processes. Empirical investigations show that plant species abundance in the field is often related to plant-soil biota interactions, however, the direction of these relations have yielded inconsistent results.</p> <p>2. We combined unique 31-year long field data on species abundances from a species-rich mountain meadow with single time point plant-soil feedback greenhouse experiments of 24 co-occurring plant species. We tested whether these relations were dynamic in time, whether coupled increases and decreases in abundance between years were related to plant-soil feedback and whether these changes were underlain by years in which manuring was applied.</p> <p>3. The prevailingly negative relationship between plant-soil feedback and plant relative abundance in the field was significantly time-dependent, which may reconcile the contrasting results in literature. Furthermore, significant coupled oscillations appeared between species relative abundance changes and plant-soil feedback, which were likely moderated by years in which manuring was applied. Our results are consistent with the notion that the more abundant species are stabilised by negative plant-soil feedback, and the less abundant species co-vary with the fluctuations of these more competitive species.</p> <p>4. Synthesis: Our results project plant-soil feedback as an important regulatory mechanism in plant communities, operating in conjunction with a species' competitive ability and soil nutrient availability. We suggest that negative feedback is particularly prominent in more abundant plant species that profit from more readily available soil nutrients than less abundant species with positive feedback. Negative plant-soil feedback may thus prevent more abundant plant species from outcompeting less abundant plant species, facilitating stable species co-existence.</p>
Data from: Soil heterogeneity increases plant diversity after twenty years of manipulation during grassland restoration
The 'environmental heterogeneity hypothesis' predicts that variability in resources promotes species coexistence, but few experiments support this hypothesis in plant communities. A previous 15-y test of this hypothesis in a prairie restoration experiment demonstrated a weak effect of manipulated soil resource heterogeneity on plant diversity. This response was attributed to a transient increase in richness following a post-restoration supplemental propagule addition, occasionally higher diversity under nutrient enrichment, and reduced cover of a dominant species in a subset of soil treatments. Here, we report community dynamics under continuous propagule addition in the same experiment, corresponding to 16-20 y of restoration, in response to altered availability and heterogeneity of soil resources. We also quantified traits of newly added species to determine if heterogeneity increases the amount and variety of niches available for new species to exploit. The heterogeneous treatment contained a factorial combination of altered nutrient availability and soil depth; control plots had no manipulations. Total diversity and richness were higher in the heterogeneous treatment during this 5 y study due to higher cover, diversity, and richness of previously established forbs, particularly in the N-enriched subplots. All new species added to the experiment exhibited unique trait spaces, but there was no evidence that heterogeneous plots contained a greater variety of new species representing a wider range of trait spaces relative to the control treatment. The richness and cover of new species was higher in N-enriched soil, but the magnitude of this response was small. Communities assembling under long-term N addition were dominated by different species among subplots receiving added N, leading to greater dispersion of communities among the heterogeneous relative to control plots. Contrary to the deterministic mechanism by which heterogeneity was expected to increase diversity (greater variability in resources for new species to exploit), higher diversity in the heterogeneous plots resulted from destabilization of formerly grass-dominated communities in N-enriched subplots. While we do not advocate increasing available soil N at large scales, we conclude that the positive effect of environmental heterogeneity on diversity can take decades to materialize and depend on development of stochastic processes in communities with strong establishment limitation.
Data from: Between-year changes in community composition shape species' roles in an Arctic plant-pollinator network
Inter-annual turnover in community composition can affect the richness and functioning of ecological communities. If incoming and outgoing species do not interact with the same partners, ecological functions such as pollination may be disrupted. Here, we explore the extent to which turnover affects species' roles --as defined based on their participation in different motifs positions-- in a series of temporally replicated plant-pollinator networks from high-Arctic Zackenberg, Greenland. We observed substantial turnover in the plant and pollinator assemblages, combined with significant variation in species' roles between networks. Variation in the roles of plants and pollinators tended to increase with the amount of community turnover, although a negative interaction between turnover in the plant and pollinator assemblages complicated this trend for the roles of pollinators. This suggests that increasing turnover in the future will result in changes to the roles of plants and likely those of pollinators. These changing roles may in turn affect the functioning or stability of this pollination network.
Lasting signature of planting year weather on restored grasslands
<p>Ecological restoration — the rebuilding of damaged or destroyed ecosystems — is a critical component of conservation efforts, but is hindered by inconsistent, unpredictable outcomes. We investigated a source of this variation that is anecdotally suggested by practitioners, but for which empirical evidence is rare: the weather conditions during the first growing season after planting. The idea of whether natural communities face long-term consequences from conditions even many years in the past, called historical contingency, is a debated idea in ecological research. Using a large dataset (83 sites) across a wide geographic distribution (three states), we find evidence that precipitation and temperatures in the planting year (2-19 years before present) affected the relative dominance of the sown (native target species) and non-sown (mostly non-native) species. We find strong support for lasting planting year weather effects in restored tallgrass prairies, thereby supporting the historically contingent model of community assembly in a real-world setting.</p>
Data from: The 15-year post-treatment response of a mixed-conifer understory plant community to thinning and burning treatments
<p>Disturbance is central to maintaining diversity in forest ecosystems. In the dry forests of the western United States, over a century of fire exclusion has altered the fire regimes of these forests, resulting in high fuel loads and a loss of plant diversity. Mechanical thinning and prescribed fire are widely used to restore structural complexity and species diversity in many western U.S. forests. While studies have shown that the reintroduction of fire into these forests initially promotes plant diversity, there is limited information on the persistence of this effect. We evaluated the effects of thinning and burning treatments on the understory plant community fifteen years after treatment in an old-growth, Sierran mixed-conifer forest. Using a full-factorial design, including three levels of thinning and two levels of burning, we found mechanical thinning and prescribed fire reduced litter depths and increased the availability of bare ground, resulting in an initial increase in herb cover. However, fifteen years after treatment, litter depths and shrub cover increased, resulting in a more homogenous understory community and a loss of herb cover. Overall, our results suggest that while thinning and burning treatments initially promote herbaceous plant cover, these effects are short lived in the absence of a second disturbance.</p>
Higher vascular plant abundance associated with decreased ecosystem respiration after 20 years of warming in the forest-tundra -ecotone
<p><span>The ongoing climate warming is promoting shrub abundance in high latitudes, but the effect of this phenomenon on ecosystem functioning is expected to depend on whether deciduous or evergreen species increase in response to warming. </span></p> <p><span>To explore effects of long-term warming on shrubs and further on ecosystem functioning, we analyzed vegetation and ecosystem CO<sub>2</sub> exchange after 20 years of warming in the forest-tundra ecotone in sub-arctic Sweden. A previous study conducted nine years earlier had found increased evergreen <em>Empetrum</em> <em>nigrum</em> ssp. <em>hermaphroditum</em> in the forest and increased deciduous <em>Betula</em> <em>nana</em> in the tundra. </span></p> <p><span>Following current understanding, we expected a continued increase in shrub abundance that would be stronger in tundra than in forest. We expected warming to increase ecosystem respiration (</span><span>R<sub>e</sub></span><span>) and gross primary productivity (GPP), with a greater increase in </span><span>R<sub>e </sub>in tundra due to increased deciduous shrub abundance, leading to a less negative net ecosystem exchange (NEE) and reduced ecosystem C sink strength. </span></p> <p><span>As predicted, vascular plant abundances were higher in the warmed plots with a stronger response in tundra than in forest. </span><span>However, whereas <em>B. nana</em> had increased in abundance since the last survey, <em>E. hermaphroditum </em>abundance had declined due to several moth and rodent outbreaks during the past decade. </span><span>I</span><span>n contrast to predictions, </span><span>R<sub>e </sub>was significantly lower in the warmed plots irrespective of habitat, and GPP increased marginally only in the forest. The lower R<sub>e</sub> and a higher GPP under warming in the forest together led to increased net C sink. </span><span>R<sub>e </sub>was negatively associated with the total vascular plant abundance.</span></p> <p><span>Our results highlight the importance of disturbance regimes for vegetation responses to warming. </span><span>Climate warming may promote species with </span><span>both a high capacity to grow under warmer conditions and a resilience towards herbivore outbreaks. Negative correlation between R<sub>e</sub> and total vascular plant abundance further indicates that t</span><span>he </span><span>indirect impacts of increased plants on soil microclimate may become increasingly important for ecosystem CO<sub>2</sub> exchange </span><span>in the long </span><span>run</span><span>, </span><span>which adds to the different mechanisms that link warming and CO<sub>2</sub> fluxes in northern ecosystems.</span></p>
Data and R code used in Alonso-Crespo et al (2024) Exploring priority and year effects on plant diversity, productivity and vertical root distribution: first insights from a grassland field experiment
<p>This release contains the raw data, R code, and RootPainter model supporting the results described in Alonso-Crespo et al (2024) Exploring priority and year effects on plant diversity, productivity and vertical root distribution: first insights from a grassland field experiment.</p>
Dutch landscapes have lost insect-pollinated plants over the past 87 years
<p>Data associated with the publication "Dutch landscapes have lost insect-pollinated plants over the past 87 years".</p> <p>Abstract:</p> <p><span>1. The interruption of plant-pollinator interactions may threaten global plant diversity, food security, and ecosystem stability. Recent reports of strong declines in both insects and plants point to insect decline as a driver of plant decline. However, it is still unknown whether these trends are related as plants often produce seeds without the need for insect pollinators, and to what extent insect-pollinated plants have declined in relation to plants not pollinated by insects. </span></p> <p><span>2. In this study, we hypothesise that natural plant communities have shifted away from insect-pollination. We combined 365,768 vegetation plots from 1930 to 2017 in the Netherlands and plant traits to assess the changes in occurrences of plants pollinated by different modes. Furthermore, we included key drivers in plant decline—specifically nitrogen, moisture, and habitat types—as interaction factors to explore the persistence of the observed changes under different environmental conditions.</span></p> <p><span>3. The proportion of insect-pollinated plants has declined while that of wind-pollinated plants has increased over the last 87 years. This proportional change reflects an absolute decrease in the number of insect-pollinated species and an increase in the number of wind-pollinated species. </span></p> <p><span>4. </span><em><span>Synthesis and applications</span></em><span>. This study implies that Dutch landscapes are losing insect-pollinated plant species, which is likely due, at least in part, to the decline in pollination services. Our results of quantifying the decline in insect-pollinated plants support the necessity and urgency of taking conservation initiatives. Several management strategies and policy recommendations could be applied to alleviate the decline of insect-pollinated plants and ensure crop safety. For example, conserving natural environments by reducing nitrogen deposition may support local plants and insect pollinators. Additionally, there is a particular need for focused efforts to protect natural grasslands, as these areas harbor many insect-pollinated plants, which have experienced declines. Finally, monitoring and assessing the state of both pollinators and (insect-pollinated) plants is needed to assess the progress of conservation measures. While recognizing the interdependence of pollinators and pollinated plants, it is crucial to extend efforts beyond pollinator conservation alone to effectively safeguard insect-pollinated plants and ensure crop safety.</span></p>
Testing the assumption of environmental equilibrium in an invasive plant species over a 130 year history
Invasive plants are an increasing threat to global biodiversity. Effective management depends on accurate predictions of their spread. However, modelling the geographic distribution of invasive species, particularly with correlative species distribution models (SDMs), is challenging. SDMs assume that species are in equilibrium with their environment (i.e., they occur in all suitable environments); this assumption is likely to be violated for a species that is actively invading new environments. This assumption is rarely assessed, and when violated can have consequences for model reliability. Using the invasive vine Vincetoxicum rossicum, we tested the hypotheses that: 1) invasive species' distribution in environmental and geographic space increase to a plateau over time; 2) this plateau is a useful proxy for equilibrium distribution, a key assumption underlying SDMs. We compare V. rossicum's expansion in environmental and geographic space between historical and current time periods and infer equilibrium when its distribution has remained stable for an extended period. We also compare the performance of SDMs from historical time periods in predicting the current geographic distribution of V. rossicum. We found that V. rossicum has reached equilibrium in environmental space, but is still expanding its geographic distribution. SDM performance was poor in the first 30 years following introduction, but improved as V. rossicum approached environmental equilibrium. Our findings demonstrate the power of including temporal dynamics and the need to consider environmental and geographic equilibrium separately when modelling the distribution of invasive species. In light of our findings, we address shortcomings of the current approach to defining an equilibrium distribution and present a new perspective for reconciling the potentially confounding influence of dispersal limitation when assessing equilibrium distribution.
Monthly production and open-circuit string voltage measurements after 10-year operation of three photovoltaic plants in Southern Spain affected by severe potential-induced degradation
<p>Data are formated in a spreadsheet file. Data are presented from three photovoltaic plants in Southern Spain (Córdoba province - Northern Andalucía) designed and installed by the same person, with the same photovoltaic module and the same model of inverter, deployed at the same time (end 2009). The plants are severely affected by potential-induced degradation (PID), so that secondary effects produce some by-pass diodes to activate, producing three families of open-circuit voltage (Voc) in the modules (~40V), (~26V) and (~12V) of a total of nominal Voc of 42,6V. </p> <p>Monthly production is shown along 11 years (2010-2021), and the measurements of the open-circuit voltage of the strings after 10 years of operation along with the voltage range of the modules of each string.</p> <p>Sheet 1: configuration of the architecture of the three photovoltaic plants and the features of the photovoltaic module installed.</p> <p>Sheet 2: energy production for 11 years of opetation. In the last years some recovery is shown in plant 1 and 2 because a repowering project.</p> <p>Sheet 3: partial climate data of the towns were the plants are located.</p> <p>Sheet 4: open-circuit voltages of the strings and number of modules in each string with open-circuit voltage in the ranges (~40V) and (<=26V) in plant 1, july-2018.</p> <p>Sheet 5: open-circuit voltages of the strings and number of modules in each string with open-circuit voltage in the ranges (~40V), (~26V) and (~12V) in plant 2, july-2020.</p>
Partitioning of water and CO2 fluxes at NEON sites into soil and plant components: a five-year dataset for spatial and temporal analysis
<p>This dataset includes estimates of transpiration, evaporation, soil respiration, and plant net photosynthesis obtained using five partitioning approaches. Flux components are available at 47 NEON sites over a period of five years. Additional meteorological inputs and water-use efficiency data are also included.</p>
Ungulate herbivores promote beta diversity and drive stochastic plant community assembly by selective defoliation and trampling: From a four-year simulation experiment
<p>Ungulate herbivores shape grassland plant communities at multiple scales, ultimately affecting ecosystem function. However, ungulates have complex effects on grasslands, including defoliation, trampling, excreta return, and their interactions. Moreover, the effects of ungulate density on grasslands are regulated by these three mechanisms. Nevertheless, how these three mechanisms affect biodiversity at multiple scales and community assembly remains poorly understood.</p> <p>Here, we conducted a 4-year novel field experiment to disentangle the effects of defoliation, trampling, and excreta return by ungulates on plant community assembly in a temperate grassland in Inner Mongolia, China. This experiment set two different scenarios: moderate ungulate density (Moderate, characterised by selective defoliation and moderate trampling) and high ungulate density (Intense, characterised by non-selective defoliation and heavy trampling), including different combinations of defoliation, trampling, and excreta return in each scenario.</p> <p>We found that defoliation and trampling increased stochasticity in community assembly and promoted alpha and beta diversity under both scenarios. Specifically, defoliation promoted the coexistence of species with multiple resource acquisition strategies (higher functional trait diversity) by reducing interspecific competition; trampling tended to facilitate random species colonisation. Conversely, excreta return favoured grasses, promoting deterministic assembly and impacting species coexistence. Notably, selective defoliation in the moderate scenario led to a dominance of stochastic processes during community assembly, whereas non-selective defoliation still did not change the dominance of deterministic processes. Further, communities subject to selective defoliation were insensitive to changes in soil properties caused by trampling and excreta return, maintaining a high-level beta diversity and the stochastic of community assembly.</p> <p><em>Synthesis:</em></p> <p>Our study provides important insights into the mechanisms by which ungulate herbivores influence plant community assembly, suggesting that defoliation and trampling have the potential to drive stochastic processes, while excreta return plays the opposite role. Our study also suggests that selective foraging by ungulates acts as stronger stochastic forces during community assembly compared to non-selective defoliation. These results imply that considering ungulate feeding preferences and foraging behaviour in grassland management will help prevent biodiversity loss and biotic homogenisation.</p>
Figure 1. First lecture room for Botany – a in Hundred years of Botany at the NWU: contributions towards understanding plant and algae function, diversity and restoration in a changing environment
Figure 1. First lecture room for Botany – a stable (Source: NWU Records, Archives and Museum).
Figure 6 in Hundred years of Botany at the NWU: contributions towards understanding plant and algae function, diversity and restoration in a changing environment
Figure 6. Stateoftheart open top chambers for research in ecophysiology (Photo: Jacques Berner).
Figure 7 in Rediscovery of Livilla radiata (Foerster, 1848) after 130 years in Hungary, with notes to the Fabaceae-associated jumping plant lice in Hungary (Insecta: Psylloidea)
Figure 7. Occurrences of Fabaceae-associated psyllids in Hungary.
Saul Flores data for manuscript in ECOLOGY: Extreme drought disrupts plant phenology: insights from 35 years of cloud forest data in Venezuela
<p>Venezuela cloud forest phenology data for tree flowers and fruits.</p>
Eighteen-year nitrogen addition does not increase plant phosphorus demand in a nitrogen-saturated tropical forest
<ol> <li><span>Nitrogen (N) deposition usually increases plant tissue N concentrations and thus phosphorus (P) demand in young and/or N-limited forests, but the N-deposition effect on plant P demand has rarely been assessed in N-saturated forests.</span></li> <li><span>Impacts of 18-year external N additions (Control: 0, Low N: 50, Moderate N:100, and High N: 150 kg N ha<sup>-1</sup> yr<sup>-1</sup>) on leaf P of four plant life-forms (tree, shrub, herb, and liana), P fractions of bulk and rhizosphere soils were examined in a N-saturated mature tropical forest in southern China. </span></li> <li><span>Leaf N, P, and N: P ratios of all plant life-forms remained stable under three N-additions. Among soil P fractions, moderate labile organic P increased by 25-33% across three N-additions; and soil total P was increased by 11.76 % under Low N, and 8.87% under High N, compared with the control. The PLS-PM results showed that the path coefficient of microbial community to available P significantly increased and of inorganic P to available P significantly decreased under N additions than control. N additions improved soil P availability through microbe-mediated P transformation: Low N significantly increased soil microbial taxonomic diversity, and a higher microbial diversity could enlarge the sources of nutrient acquisition and stimulate decomposition of recalcitrant organic matters; while High N significantly decreased soil microbial taxonomic diversity, the remaining microorganisms that were screened by N-rich environments had the characteristics of resisting the N-addition effects and maintained efficient P acquisition.</span></li> <li> <span><em>Synthesis</em>.</span><span> Our findings provide a novel line of evidence that long-term N deposition did not increase plant P demand in a N-saturated mature tropical forest. The underlying mechanism is that plants did not increase N uptakes therefore nor increase P uptakes (a stable leaf N: P stoichiometry) in an already N-saturated ecosystem. Different N addition rates regulated soil P transformation via microbial community transition. These findings help improve the understanding of plant P acquisition and modeling of biogeochemical N-P cycling and vegetation productivity in N-rich forest ecosystems, particularly considering the fact that chronic N deposition may likely lead to soil N richness and even saturation of many forests in the future.</span> </li> </ol>
Higher vascular plant abundance associated with decreased ecosystem respiration after 20 years of warming in the forest-tundra -ecotone
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