Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"litterfall"”.
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The dynamics of litterfall in eucalypt woodland surrounding pine plantations
… was to quantify the amount of native and exotic litterfall at reference and adjacent sites. At each sampling plot, I measured the amount of native and exotic litterfall (i.e. pine litter intrusion) every 4 weeks for 1 year at Gurnang State Forest and for 2 years at Jenolan Caves Karst …
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… inputs to terrestrial ecosystems via changes in litterfall and plant net primary production (NPP). However, the effects of shifting detrital C inputs on belowground microbial community function, C cycling and fluxes remain largely unknown, especially in tropical forest ecosystems. To investigate …
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… inputs to terrestrial ecosystems via changes in litterfall and plant net primary production (NPP). However, the effects of shifting detrital C inputs on belowground microbial community function, C cycling and fluxes remain largely unknown, especially in tropical forest ecosystems. To investigate …
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Effects of gypsy moth defoliation on acorn production and viability, litterfall, and litter layer depth and biomass in north-central Virginia and western Maryland
… quantity, weight, development, and viability; litterfall; and forest floor depth and biomass. Nineteen plots in north-central Virginia and western Maryland on which trees suffered heavy, moderate, or no defoliation were monitored over a two-year period.
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Nutrient fluxes and soil microbial processes
… (c) nutrient input fluxes from throughfall and litterfall (d) foliar nutrient status. This investigation was carried out in south-eastern Belgium at a site converted in 1998 to a mixed deciduous stand, after two spruce generations. Plantations of common alder (Alnus glutinosa (L.) GAERTN.), …
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Physiological and growth responses to thinning in eight-year-old loblolly pine (Pinus taeda L.) stands
… during their ninth and tenth growing seasons. Litterfall dynamics were monitored throughout the study period as well. At the end of the second post-thinning growing season, trees in thinned plots had greater stem diameters, greater live crown ratios, greater live crown diameters and greater …
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Nutrient dynamics of the forest floor in an Appalachian oak forest stand following clearcutting and whole-tree removal
… August, and November of 1979 and 1980. Monthly litterfall was collected from October, 1979, through October, 1980. Soil solution samples were extracted on a biweekly basis from April, 1980, through March, 1981, and concurrent soil moisture and temperature determinations were made. All samples …
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Physiological responses of sun and shade foliage in thinned and unthinned ten-year-old loblolly pine stands
… foliage were examined. Xylem water potential, litterfall dynamics and tree growth were monitored. Nutrient availability, chlorophyll content and chlorophyll a/b ratio were assessed. At the end of the third post-thinning growing season (eleventh season since planting), thinned trees had larger …
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Studies on Australian acacias in the South Western Cape, South Africa
… reproductive biology, shade tolerance, litterfall and biomass. The implications of these findings for management are discussed in the general conclusion, and the raw data is tabulated in four appendices. The work is illustrated with 37 figures.
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Seasonal and Spatial Variation in Leaf Area Index, Litter Production, and Light Levels in Myrica Cerifera,Shrub Thickets Across a Barrier Island Chronsequence
… of the actual values. According to annual litterfall, LA1 ranged from 4.1 ± 0.5 for the oldest thicket to 10.2 ± 0.4 for a 20 year old thicket. Leaf area index varied from 6.4 ± 0.2 for the oldest thicket to 1 1.4 ± 2.1 for the 40 year old thicket according to the allometric relationships, …
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Cocoa yield, nutrients and shade trees in traditional cocoa agroforests in a climate change context: a case study in Bahia, Brazil
… role of shade trees and the nutrient dynamics in litterfall. Finally, I explore the risk that climate change could represent for cocoa production in the future by looking at the effects of an unexpected drought caused by an El Niño Southern Oscillation (ENSO) event between November 2015 and May …
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Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… since beetle attack, including unattacked trees. Litterfall inputs under beetle-attacked WbP trees were more than ten times higher than those under unattacked trees. In response, soil NH4+ concentrations in the organic horizons increased from 15 µg N/g soil under unattacked trees to 33 µg N/g soil …
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Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… since beetle attack, including unattacked trees. Litterfall inputs under beetle-attacked WbP trees were more than ten times higher than those under unattacked trees. In response, soil NH4+ concentrations in the organic horizons increased from 15 µg N/g soil under unattacked trees to 33 µg N/g soil …
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Organic Matter Processes of Constructed Streams and Associated Riparian Areas in the Coalfields of Southwest Virginia
… matter functions were evaluated: riparian litterfall input, leaf breakdown, and periphyton accrual. Constructed streams were typically warmer than reference streams and also had elevated specific conductance, elevated oxidized nitrogen concentrations, depressed benthic macroinvertebrate …
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Community and ecosystem analysis of forests recovering from landslide disturbance: White Mountain National Forest, New Hampshire
… on 4 landslide sites of varying age. Foliar and litterfall nutrient content, and the ratios of the macro nutrients, P, K, Ca and Mg with N are compared to observe potential nutrient imbalances and limitation. Litter decay and nutrient dynamics illustrate relative cycling rates of these elements …
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Interactions of insect herbivory and multiple abiotic stress agents on two wetland tree species in southeast Louisiana swamps
… feces), spring-clipped leaves, and abscised litterfall at all sites for both tree species. Nitrogen content of canopy foliage and litterfall was positively correlated with site health. These findings support the hypotheses that the swamps in Lake Maurepas are nutrient limited, and the …
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Biogeochemistry of Organotin and Organolead compounds in a Forested Catchment in NE-Bavaria, Germany
… from the atmosphere, estimated as throughfall + litterfall fluxes, amounted to 3.7 mg Pb ha-1 yr-1 for TML and 52 g Pb ha-1 yr-1 for Pbtotal. The contribution of litterfall was 1.5% and 32%, respectively. The annual total deposition of OTCtotal was 172 mg Sn ha–1 yr–1, with 26% represented by …
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Carbon Pools and Fluxes as an Indicator of Riparian Restoration
… stage of succession was surpassed, the litterfall component of NPP plays a greater role riparian forests. As a woody overstory became established (after ~ 8-10 years), annual litterfall rates as a function of NPP were independent of forest age. Establishment of woody species occurred ~8 …
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Litter production and accumulation in naturally seeded, old-field, Virginia pine (Pinus virginiana Mill.) stands
… during the fall months. Estimated annual total litterfall ranged from2.90mt/ha dry weight in the 7-year-old stand to 5.49 mt/ha dry weight in the 36-year-old stand: The percent annual contribution of non-needle material to the total increased from 16.5% in the 7- year-old stand to 43.9% in the …
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The effect of soil nutrient availability on resource allocation in tropical tree species
… and carbon cycling. Through a comparison forest litterfall patterns along a natural fertility gradient and experimental nutrient addition, I show that responses of forest productivity to nutrient availability are difficult to predict across space from environmental parameters alone due to …
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