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Locations of the 14 paired plots at the old and new infestation sites in Southwestern Ontario. Each site had two sets of paired plots spaced 50-100 m apart and, in all but one case, situated on opposite sides of the stream.
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Emerald ash borer (EAB) is an alien invasive species that is spreading across Canada and the United States killing ash trees. In riparian forests where ash may be abundant; loss of ash can induce significant structural changes; including the creation of canopy gaps; changes in light penetration; expansion of ground vegetation; and alteration of soi...
Context in source publication
Context 1
... plots (5 × 5 m) were established at each of two sites in Southwestern Ontario distinguished by differences in the timeline of infestation. The "old" infestation site (8-10 years since complete ash mortality) was located near Essex, Ontario (42˚10'23" N, 81˚46'12" W); the "new" infestation site (1-3 years since complete or nearly complete ash mortality) was located near Glencoe, Ontario (42˚44'50" N, 81˚42'34" W), approximately 90 km to the northeast (Figure 1). Site selection was not random insofar as we wanted to ensure a clear demarcation between closed and open canopy plots and congruence with previously published work [11]. ...
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In forest ecosystems nutrient availability is one of the most important drivers of tree growth and ecosystem function. We studied changes in soil and foliar nutrients (N, P & K) and leaf N and P stoichiometry in eight dominant canopy and sub-canopy forest tree species of Central Himalayan forests occurring between 300 and 2200 m asl. Nutrient (N, P & K) concentration in leaves at bud break, mature and senescent stage varied significantly across the tree species. The nutrient resorption efficiency (NRE) varied significantly across the species and found ranging for N from 48.7-76.8%. Both the nitrogen resorption efficiency (NRE) and phosphorus resorption efficiency (PRE) increased linearly with altitude (R2= 0.647 for NRE significant at p< 0.05; and R2 for PRE= 0.525; NS) pointing out that trees growing in temperate climate conserve nutrients more efficiently to withstand the slow mineralization due to cold climate. With the increasing altitude leaf lifespan increases significantly (R2= 0.0025; p< 0.0074). ANOVA indicates that the foliar N and P and altitude were unrelated. The low N: P ratio, a measure of nutrient status of forest ecosystems at senescent leaf stage, found ranging from 9.97 in Q. floribunda to 18.8 in P. roxburghii points out that forests of the study region are nutrient stressed, partly due to low P mineralization in temperate climate, leaching of nutrients due to heavy monsoon rain, and poorly developed underlying geology. Thus, the Central Himalayan forests are characterized by high NRE and low growth rate with increasing altitude. Winter season warming might help improve the nutrient availability in the forest floor and nutrient uptake to enhance nutrient cycling and biomass productivity in these forests. Research Article
The nutrients status of herbaceous species in riparian zones of Africa is often neglected, with focus mainly on woody species, despite the crucial role played in the functioning of the forest ecosystems. The herbaceous species in riparian forest ecosystems contributes significantly to litters accumulated in the forest floor more invariably playing a significant role in nutrients return to the soil more than woody species. Herbaceous species were collected from five (5), 1 m × 1 m quadrats randomly laid within each sampling plot. The collected samples from the quadrats were pooled together from each sites and oven dried at 80 °C for 72 h and weighed to constant weight. The ground samples were analysed for nutrients. The increasing order of nutrient elements concentration in the herbs across sites were: P < Na < Mg < K < N < Ca < C. The uptake of nutrients by herbaceous species is strongly influenced by site uniformity, level of disturbances, the nutrient concentrations of these elements resident in the soil of the riparian forest ecosystems.
