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57 results for “Litterfall”
Soil phosphorus, litterfall mass, nitrogen and phosphorus in eight Puerto Rico forests affected by hurricanes Hugo, Bertha, Georges, Irma, and Maria.
Tropical cyclones are intensifying and occurring at higher latitudes in recent decades, but the mechanisms underpinning the resistance (ability to withstand disturbance-induced change) and resilience (pace of return to pre-disturbance reference values) of tropical forests to cyclones remains largely unexplored at the pantropical scale. We conducted a meta-analysis to investigate the role of soil resource availability (i.e., total soil phosphorus concentration) in mediating site-level forest canopy resistance and resilience to cyclones pan-tropically. We evaluated cyclone-induced and post-cyclone litterfall mass (g/m2/day), phosphorus (P) and nitrogen (N) fluxes (mg/m2/day), as well as concentrations (mg/g) across 73 case studies in Australia, Guadeloupe, Hawaii, Mexico, Puerto Rico, and Taiwan (Bomfim et al., in review). This dataset includes information related to 42 case studies in eight Puerto Rico forests affected by hurricanes Hugo, Bertha, Georges, Irma, and Maria between 1989 and 2017. This dataset also includes data for the canopy trimming experiment (CTE) in El Verde. - The compiled Litterfall Mass and Nitrogen and Phosphorus Flux and Concentration data from natural forest ecosystems across Puerto Rico prior to and after eight hurricanes are provided in Forest-Soil-Litterfall-Hurricane_Puerto-Rico.csv. This data file also includes site location, geographical characteristics, elevation, soil phosphorus concentration, geology, and several variables related to each hurricane disturbance. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Litterfall of the tabonuco forest before Hurricane Hugo
We examined forest structure, tree species composition, litterfall rate, and leaf litter decomposition in a mid-successional forest (MSF) and an adjacent mature tabonuco forest (MTF) in the Luquillo Experimental Forest of Puerto Rico. Whereas the MTF site received limited human disturbance, the MSF site had been cleared for timber production by the beginning of this century and was abandoned after hurricanes struck the Luquillo Mountains in the 1920s and 1930s. We found that the MSF was dominated by successional tree species 50 yrs after secondary succession, and did not differ in tree basal area and litterfall rate from the MTF. Leaf decomposition rate in the MSF was higher than in the MTF, but this difference was small. Our results show that deforestation has long-term (> 50 years) influence on tree species composition and that leaf decomposition processes in secondary forest is relatively faster than recovery of tree species composition. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Litterfall along topographic gradients at lower Bisley
Litterfall (fine and coarse) due to Hurricane Hugo and subsequent fine annual litterfall inputs (1, 2 and 5 yr after Hugo) were determined for two sites (El Verde and Bisley) in the Luquillo Experimental Forest in Puerto Rico. Litter transfers into streams, riparian and upslope areas were determined within each catchment. The recovery rate of aboveground fine litterfall (leaf, fine wood <1 cm diameter, and other miscellaneous inputs) to predisturbance levels were determined 1, 2, and 5 yr after Hurricane Hugo. The amount of total litter transfers and their individual components into the riparian and upslope areas due to Hurricane Hugo varied significantly by catchments within the Luquillo Experimental Forest. At El Verde, 26-39%, 31- 35%, 14-35% and 7-12% of the total litter transfers were contributed by leaf litter, fine wood, coarse wood and fine roots, respectively. At Bisley, 28-31%, 26-29%, 33-35% and 8-10% of the litter transfers were contributed by the same categories. Differential decay rates contributed to the relative importance of fine and coarse litter inputs. The recovery of fine aboveground litterfall to pre-hurricane levels after 5 yr varied by topographic location (streams had the slowest recovery, upslope areas the highest) and catchment (El Verde: 55-77%; Bisley: 39-82% of pre-hurricane values). Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Litterfall Weights From LTER Study Site Treatment Plots: 1990 - Present
Litter is measured within the nutrient treatment plots at LTER research sites located within the Bonanza Creek Experimental Forest. The 21 LTER treatment sites monitored for litterfall represent three replicates each of four successional stages of primary succession on the floodplain of the Tanana River and three stages of succession following wildfire in the uplands. Three litter trays are placed within each treatment at the 21 LTER sites. Litter trays are 0.5 m x 0.5 m wooden frames constructed of 1" x 4" boards with fine screen stapled to the bottom side. Litter is collected in the spring as soon after snowmelt as possible (usually in May) and in some years in the fall just before freeze-up as well. Litter collections bagged are removed to the lab where they are dried in ovens at 65 deg C for at least 48 hours. Each sample is then weighed to the nearest 0. 1 grams. In 2009 treatments A and C were dropped from the study after finishing the 20 year study.
Litterfall on the elevational gradient (Group 1) at Coweeta Hydrologic Laboratory from 1992 to 1993
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 2) focusing on Rhododendrum leaf litter from the Coweeta Hydrologic Laboratory from 1994 to 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 3) from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 4) with a focus on greenfall from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 5) from the Coweeta Hydrologic Laboratory in 1995
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 6) from the Coweeta Hydrologic Laboratory from 1995 to 1996
Null Hypothesis: Litterfall weights not statistically different between plots on the altitudinal gradient.
Litterfall on the elevational gradient (Group 7) in the Coweeta Hydrologic Laboratory from 1996 to 1998
Null Hypothesis: Litterfall weights are not statistically different between plots on the altitudinal gradient.
Nematode total numbers in greenfall and litterfall exclusion quadrat treatments on canopy plots in 1998
Numbers of nematodes per gram dry weight of litter are reported from litterbags placed in quadrat treatment boxes on canopy gradient sites. Treatments for this project are greenfall exclusion and litterfall exclusion. See Reynolds 2000 dissertation, Effects of canopy herbivores on soil systems along an elevation gradient. All data are from collections made in 1998.
Terrestrial Gradient Litterfall Dry Mass, Coweeta LTER, 1994-2017
This project was started by Haines and Crossley in 1992 to compare leaf litter weights among the five gradient plots (though data from the first collections were not included in this dataset because the original dataset did not represent a complete quarter of collection). Litter is collected from ten 0.92x0.92 m leaf collectors within each of the gradient plots. Litter is collected on a quarterly basis (monthly in the autumn). The litter is then separated by category, dried, weighed, and processed in a Wiley mill for later nutrient analyses. Since the project first started, the collection process has expanded to include non-leaf litter (e.g., lichens, bark, and seeds), fine twigs (0-2.5 cm diameter), and medium twigs (2.5-10 cm diameter).
Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Litterfall mass 2009-2022
This dataset describes litterfall mass collected in the Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE) study in New Hampshire from fall 2009 through summer 2022. Litter was collected three times per year: fall (late October or early November), spring (June), and summer (August). Fall litter was sorted by species in a subset of stands. This data package also includes the R code used to impute missing data for analysis, a manually edited data file used in the R code flow, and a file matching the labels for litterfall collectors from the original (pre Fall 2011) and current (Fall 2011 and onwards) labeling systems. All collectors have the most current label if known for all years of data. Additional detail on MELNHE, including a table of stand descriptions, project description, and a diagram of plot configuration can be found in this data package: Yanai, R.D., M. Fisk, and T.J. Fahey. 2024. Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Project description, plot characteristics and design ver 2. Environmental Data Initiative. https://doi.org/10.6073/pasta/6cc8a39d052834c030650fb29937bf4f (Accessed 2024-10-17). Litterfall chemistry data for a subset of these samples can be found in the following data package: Fisk, M.C., R.D. Yanai, S.D. Hong, C.R. See, and S. Goswami. 2022. Litter chemistry and masses for the MELNHE NxP fertilization experiment ver 1. Environmental Data Initiative. https://doi.org/10.6073/pasta/8b2975a3a02cbcfb1b0a12ac954576d4 (Accessed 2024-06-09). These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Litterfall production and litter decomposition experiments: in-situ datasets of nutrient fluxes in two Bornean lowland rain forests associated with Acacia invasion
<p>This dataset contains the original data from which the figures and tables for the article "Differential impacts of <em>Acacia</em> invasion on nutrient fluxes in two distinct Bornean lowland tropical rain forests" were prepared. It documents parameters relevant to nutrient fluxes via litterfall production and leaf litter decomposition rates from 2016 to 2017 in two selected lowland rainforests in Brunei Darussalam that are associated with <em>Acacia</em> invasion. Both litterfall sample collection and litter decomposition bag experiments followed standard protocols. Leaf litterfall fractions from the litterfall production experiment were analysed for nutrient contents of nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), and calcium (Ca). Nutrient addition and nutrient use efficiency values were calculated based on nutrient concentration and monthly leaf litterfall production in the different habitat types studied. The mean percentage of litter mass remaining, K day<sup>-1</sup>, K year<sup>-1</sup>, half-life t<sub>0.5</sub>, pH values, and nutrient concentrations (N, P, K, Mg, Ca) were calculated for leaf litter samples collected after 336 days in the different habitats.</p>
Biweekly fine litterfall in the 18 CARBONO Project plots, La Selva Biological Station, October 1997-October 2018
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Data for Global Patterns of Nitrogen and Phosphorus in Reproductive and Leaf Litterfall, 1966 to 2022
Reproductive and leaf litterfall nitrogen and phosphorus data was compiled from previously published studies and is global in extent. The publication years from which data was obtained spans from 1966 to 2022. The data was compiled in order to assess global scale trends of nitrogen and phosphorus in both reproductive and leaf litterfall. This dataset was used in "Global Patterns of Nitrogen and Phosphorus in Reproductive and Leaf Litterfall", published in Ecosystems, by Steven W. Gougherty and Pamela H. Templer.
Monthly litterfall, monthly tree band, and annual tree growth of a South Carolina coastal wetland forest
In the southern United States, forested wetlands are of special interest because of the extent of these forests. One of the problems in developing management practices for these areas is the difficulty in adequately describing productivity relations and predicting how the structure and function of these communities might be affected by natural or anthropogenic disturbances. Community response to environmental change often occurs over a period of years, and the majority of reported studies are for 1–3 years in duration. This study was initiated in an attempt to examine long-term changes in forest systems in response to drought, flooding, hurricanes, and climate change. This study documents long-term changes in structure, composition, and growth along a gradient of high water table forested sites of an ancient beach ridge landscape in coastal South Carolina. Permanent study plots (20-m x 25-m) were established across a moisture gradient (Xeric, Mesic, and Hydric – 5 plots in each) within a longleaf pine-swamp blackgum forest system on the southern end of the Waccamaw Neck area of Georgetown County, SC in January 2000. Litterfall was measured monthly using five 0.25 m2 litter traps in each plot beginning in February to December 2018. Monthly circumference change was recorded on a subset of trees within each plot using stainless steel dendrometer bands. Diameter of all trees greater than or equal to 10 cm diameter at breast height in each plot was recorded annually at the end of the growing season.
Litterfall collected from LTTG Sites (1 meter litter trays): 1967 - Present
Litter is measured within 20 x 20 m plots at LTTG research sites representing aspen, birch, black spruce, and white spruce forest types. There are 15 LTTG research sites currently monitored for litterfall and 8 additional sites where litterfall data was collected but the are no longer active. Three litter trays are placed randomly within each of the plots . Litter trays are 1 m x 1 m wooden frames constructed of 1" x 4" boards with fine screen stapled to the bottom side. Litter is collected in the spring as soon after snowmelt as possible (usually in May). Secondary growth (wood) material is separated from all other plant litter (leaf, flowers, bracts, etc.) and placed in labeled paper bags separately by tray. Litter collections are removed to the lab and dried in ovens at 65 deg C for at least 48 hours. Each sample is then weighed to the nearest 0.1 grams.
Carbon in Permafrost Experimental Heating Research (CIPEHR) project: Foliar mineral element concentrations, stocks, and annual litterfall fluxes in July 2009 and 2017
In this study, we are asking the question: how permafrost degradation may influence foliar mineral element cycling with changing subarctic tundra vegeatation? We are answering this question by using a combination of field measurements (aboveground biomass, foliar biomass, foliar net primary productivity (NPP)) and laboratory measurements (mineral element foliar concentration: Al, Ca, Fe, K, Mn, P, S, Si, and Zn) to evaluate the mineral element foliar stocks and the mineral element foliar fluxes upon annual litterfall. We covered 5 vascular plant species from an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. Elemental analyses of plant species typical from the moist acidic tundra (in 2009 and 2017), combined with relative aboveground biomass and NPP measurements, brought key information on the influence of permafrost degradation and the vegetation composition on the litter elemental composition, and thereby the plant nutrient cycling across the subarctic tundra.
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