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724 results for “NPP”
Fig. 3 in Naturalization Of Melanoides Tuberculata And Tarebia Granifera (Thiaridae, Gastropoda) M O L L U S K S U N D E R T H E H Y D R O E C O L O G I C A L Conditions Of Zaporizhzhya Npp Cooling Pond
Fig. 3. Percentage ratio of Thiaridae mollusks on concrete walls of the outflow channels of Zaporizhzhya NPP.
Fig. 1 in Naturalization Of Melanoides Tuberculata And Tarebia Granifera (Thiaridae, Gastropoda) M O L L U S K S U N D E R T H E H Y D R O E C O L O G I C A L Conditions Of Zaporizhzhya Npp Cooling Pond
Fig. 1. Melanoides tuberculata and Tarebia granifera (Thiaridae, Gastropoda) in and its localities in Ukraine: 1 – the cooling pond of the Zaporizhzhya NPP (47°50'42″N; 35°56'89"E); 2 – cluster of mollusks on concrete walls of the channel of the nuclear power plant; 3 – accumulation of M. tuberculata on a stony substrate in the region of the discharge channel of the nuclear power plant, September 15, 2017; 4 – accumulation of M. tuberculata and T. granifera on reed roots.
OMPS-NPP L2 LP USask Aerosol Extinction Vertical Profile swath daily V1.2
<p>The USask OMPS-LP L2 2D Aerosol v1.2 product provides stratospheric aerosol extinction retrievals performed at the University of Saskatchewan for the central slit of the Ozone Mapping and Profiler Suite Limb Profiler (OMPS-LP) instrument on the Suomi-NPP satellite. The two-dimensional retrieval algorithm accounts for variation in the along orbital track dimension, retrieving an entire orbit simultaneously instead of treating each image independently. Stratospheric aerosol is retrieved from approximately the thermal tropopause to 30 km on a 1 km grid with a vertical resolution of approximately 2 km, and is assumed to be sulfate aerosol following a log-normal particle size distribution.</p> <p>Each file contains data from the daylight portion of each orbit measured for a full day. Spatial coverage is global (-82 to +82 degrees latitude), and there are about 14.5 orbits per day, each has typically 160 profiles with an along orbital track sampling of 125 km. The files are written using NetCDF4.</p>
Latitudinal gradient, MEND experiment, and BioGen experiment relating species richness and net primary productivity (NPP)
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Shrub Growth, NPP, and Nitrogen Assimilation for Two Years in an Alberta Peatland Subjected to Increasing Nitrogen Deposition, 2014-2015
Development of the oil sands has led to increasing atmospheric N deposition, with values as high as 17 kg N ha-1 yr-1; regional background levels <2 kg N ha-1 yr-1. Bogs, being ombrotrophic, may be especially susceptible to increasing N deposition. To examine responses to N deposition, over five years, we experimentally applied N (as NH4NO3) to a bog near Mariana Lakes, Alberta, at rates of 0, 5, 10, 15, 20, and 25 kg N ha-1 yr-1, plus controls (no water or N addition). In July of each year, we collected new growth of the three shrub species, returned them to the lab, and analyzed them. Non-destructive measurement of aboveground NPP for the three dominant shrub species, Andromeda polifolia, Chamaedaphne calyculata, and Rhododendron groenlandicum was based on allometric equations developed. Results for species were varied, however, water addition alone had no significant effect on NPP for any of the species or for the dominant shrubs combined in either 2014 or 2015 (p >= 0.47). The mass of newly produced shoot segments for Chamaedaphne calyculata, Andromeda polifolia, Rhododendron groenlandicum, and these three dominant shrubs combined all increased with increasing N input. As N input increased, the number of newly produced shoots (vegetative buds m-2) increased linearly for A. polifolia and the three shrub species combined. The number of newly produced shoots increased up to 16.6 ± 2.5 kg N ha-1 yr-1 and then decreased for C. calyculata and was unaffected for R. groenlandicum. Shrub growth response to increased N could lead to a shading out of the underlayer of mosses changing the bog and potentially compromising its structure and function.
Changes in vegetation in northern Alaska under scenarios of climate change, 2003-2100: II - Change in net primary production (NPP)
This data has npp values from northern AK based on a modeling study for the years 2003-2100. See Euskirchen et al., 2009 for more information. This file contains data for Figure 4.
Changes in vegetation in northern Alaska under scenarios of climate change, 2003-2100: III - Decadal net primary productivity (NPP) and heterotrophic respiration
These data contain NPP, NEP, and RH values from northern AK based on a modeling study for the years 2003-2100. See Euskirchen et al., 2009 for more information. V This file contains data for Figure 5.
Annual ground-based photographs taken at 15 net primary production (NPP) study sites at Jornada Basin LTER, 1996-ongoing
This data package contains a list of ground-based photographs taken at fifteen Net Primary Production (NPP) study sites at the Jornada Basin LTER. Sites were selected to represent the 5 major ecosystem types in the Chihuahuan Desert (upland grasslands, playa grasslands, mesquite-dominated shrublands, creosotebush-dominated shrublands, tarbush-dominated shrublands). For each ecosystem type, three sites were selected to represent the range in variability in production and plant diversity; thus the locations are not replicates. At each site, a 1 hectare area was fenced in 1988 and a grid of 49 (48 at one playa location) 1m x 1m replicate quadrats was laid out when vegetation sampling began in 1989. Beginning in 1996, annual photos were taken from each of the 4 corners of each of the 15 70-meter x 70-meter NPP sites between August and November, depending on other research activity constraints. From 1996-2002 photos were taken using 35mm color slide film. Beginning in 2003, digital photos were taken in JPG format. Occasionally, supplemental photos may be taken at the same time that provide additional habitat information at the landscape, patch, or plant species level. No photographs were taken in 2013. Photo files (.jpeg format) are included in annual ZIP archives attached to this data package. This is an ongoing dataset that is updated once per year.
SGS-LTER Aboveground NPP on and off US Forest Service Burns on the Pawnee National Grassland, Colorado, USA 1997-2004
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. Most investigators studying grasslands have assumed that the low standing biomass of the SGS created a system with a low probability of carrying fire, and thus a minimal historical role of fire. Nonetheless, there are years with aboveground biomass equivalent to the mixed grass prairie, and a high frequency of lightening storms. Regardless of the historical role of fire in SGS, there are new questions regarding its utility in managing for the presence of the threatened mountain plover, which only nests in areas of low plant biomass. United States Forest Service, Pawnee National Grassland recently initiated a burning program in the mid 1990s to address questions about using fire to increase plover habitat; we have collected data on some of these plots to investigate the influence of fire on SGS vegetation. Several datasets were created between 1999 and 2004 by SGS-LTER researchers, including measurements of shrub and cactus mortality rates, aboveground net primary production, amounts of litter and standing dead, and aboveground nitrogen dynamics in burned and control plots in the western section of the Pawnee National Grassland. Additional information and referenced materials can be found: http://hdl.handle.net/10217/83326.
Gradients2-MGL1704-14C-NPP_2020-03-25_v1.0
<p>Cruise: Gradients 2, MGL1704</p> <p>Project Name: Simons Foundation, Gradients NPSG</p> <p>Description:</p> <p>Standard HOT protocols were used to measure in vitro primary productivity (PP) via the 14C radiotracer method [Karl et al., 1996]. Water samples were collected from 15m before dawn and incubated on deck in incubators screened to ~50% of surface irradiance and plumbed with flow through surface seawater for temperature regulation. Duplicate 500-ml bottles were incubated in the incubator for ~12hr and 24hr, light bottles were paired with dark bottles. A time zero sample was taken at each station to ensure acidification was complete. Following dawn to dusk or dawn to dawn incubations, each sample was filtered onto a 25mm glass fiber filter. Filters were acidified with 1 ml of 2N hydrochloric acid in a fume hood for 12 hr to remove inorganic 14C after which 10 ml of Ultima Gold scintillation fluid was added to each sample. Radioactivity was determined using a Perkins Elmer 2600 liquid scintillation counter. The rate of PP was calculated by multiplying the percent of carbon labeled by the total carbon available for photosynthesis (e.g. dissolved inorganic carbon, DIC, calculated from SST and salinity measured at each station as per Lee et al. [2006]) and dividing by incubation time (t = 1 day). Rate measurements in light bottles were corrected to remove the rate measured in parallel dark bottles. All rates are in units mg C m-3; ‘stdev’ refers to the standard deviation of duplicates for each incubation type. NaNs represent data missing or not collected.</p>
S-NPP VIIRS SDR data 2015-03-01 02:48
<p>Suomi NPP VIIRS SDR data from the Norrköping DR station, covering Northern Europe including Scandinavia and surrounding seas.</p> <p>2015-03-01 02:48 - 03:03</p>
Fig. 2 in Naturalization Of Melanoides Tuberculata And Tarebia Granifera (Thiaridae, Gastropoda) M O L L U S K S U N D E R T H E H Y D R O E C O L O G I C A L Conditions Of Zaporizhzhya Npp Cooling Pond
Fig. 2. Mollusks in the hydrobiological frame 25x25 cm.
35,000-year record of pollen, charcoal and NPP from Bass Strait, southeast Australia
<p>We reconstruct the last glacial vegetation (pollen record), fire (charcoal record) and lake levels (NPP record) for Bass Strait. Results show the Bass Strait area was characterized by <i>Eucalyptus</i> woodland and shrubland vegetation, with high fire activity and lake levels from 35,000 to 29,000 years ago. Grassland expanded at the expense of woodland after this period, with a decline in fire activity and lake levels.</p>
Code for Producing a Pixel-scale Corrected Nighttime Light Dataset (PCNL, 1992-2021) Combining DMSP-OLS and NPP-VIIRS
<p>We proposed a set of DMSP-OLS and NPP-VIIRS inter-correction methods and produced a pixel-scale corrected nighttime light dataset (PCNL, 1992-2021).</p> <p>Two sets of reliable global nighttime light datasets were chosen as the basis. CCNL-DMSP (1992-2013) is a consistent and corrected nighttime light dataset produced from DMSP-OLS. CCNL-DMSP mainly solved three problems of DMSP-OLS, namely, interannual inconsistency, saturation and blooming. The annual VNL-VIIRS dataset available on the Earth Observation Group website was also used, and the monthly median masked data of V21 was selected. Using filtering and employing outlier removal, VNL-VIIRS has removed sunlit, moonlit and cloudy pixels, and has discarded biomass burning pixels.</p> <p>PCNL shows a great temporal and spatial consistency at both the pixel scale and the regional scale.</p>
Gradients 4 - TN397 - 14C NPP - Arrays
<p>Standard HOT protocols were used to measure in vitro primary productivity (PP) via the 14C radiotracer method [Karl et al., 1996]. Water samples were collected via CTD before dawn at certain depths, treated, and then redeployed on an array to the depths from which the water was sampled. A time zero sample was taken at each station to ensure acidification was complete. Following 12-hr dawn to dusk incubations in situ, the arrays were recovered and each sample was filtered onto a 25mm glass fiber filter. Filters were acidified with 1 ml of 2N hydrochloric acid in a fume hood for 12 hr to remove inorganic 14C after which 10 ml of Ultima Gold scintillation fluid was added to each sample. Radioactivity was determined using a Perkins Elmer 2600 liquid scintillation counter. The rate of primary productivity was calculated by multiplying the percent of carbon labeled by the total carbon available for photosynthesis (e.g. dissolved inorganic carbon, DIC, calculated from SST and salinity measured at each station as per Lee et al. [2006]) and dividing by incubation time (t = 1 day). Time stamp is in UTC.</p>
Satellite-derived trait data slightly improves tropical forest biomass, NPP, and GPP predictions
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35,000-year record of pollen, charcoal and NPP from Bass Strait, southeast Australia
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TeRaCON eight years data - species composition, productivity (NPP), soil carbon emissions and plant carbon stocks:BioCON: Biodiversity, CO2, and Nitrogen
BioCON (Biodiversity, CO2, and Nitrogen) is an ecological experiment started in 1997 at the University of Minnesota's Cedar Creek Ecosystem Science Reserve. BioCON's goal is to explore the ways in which plant communities will respond to three environmental changes that are known to be occurring on a global scale: increasing nitrogen deposition, increasing atmospheric CO2, and decreasing biodiversity. Why Biodiversity, CO2, and Nitrogen? While there are many uncertainties in global change biology, there are also some well documented facts. Some of these are: 1. The amount of carbon dioxide (CO2) in the atmosphere is rising. Since the industrial revolution, the CO2 concentration in the atmosphere has increased from approximately 275 parts per million (ppm) to about 378 ppm today. This has been largely the result of fossil fuel burning. It is expected that CO2 levels will continue to rise, and that by the year 2050 these levels will be approximately 550 ppm. CO2 is the raw material for photosynthesis and is known to affect plant growth and development. 2. The amount of nitrogen moving through terrestrial ecosystems has increased in the recent past. While natural "background" levels of nitrogen fixation have remained constant, human additions to the system through fertilizer production and fossil fuel use have increased dramatically. Nitrogen is a key nutrient for plant growth and plays a critical role in plant community structure and composition in many environments. 3. Biodiversity levels are falling. While the research and data are not as complete as they are for CO2 and nitrogen, data indicate that the number of species globally, is being reduced. Perhaps more important for ecosystem function, diversity levels on local to regional scales have fallen due to land use change, biotic invasion and many other drivers. While much is known about how each of these factors affects ecosystem functioning, many questions remain. There is also little data on how these issues affe
TeRaCON eight year mean of NPP, carbon pools, and soil flux:BioCON : Biodiversity, Elevated CO2, and N Enrichment
BioCON (Biodiversity, CO2, and Nitrogen) is an ecological experiment started in 1997 at the University of Minnesota's Cedar Creek Ecosystem Science Reserve. BioCON's goal is to explore the ways in which plant communities will respond to three environmental changes that are known to be occurring on a global scale: increasing nitrogen deposition, increasing atmospheric CO2, and decreasing biodiversity. Why Biodiversity, CO2, and Nitrogen? While there are many uncertainties in global change biology, there are also some well documented facts. Some of these are: 1. The amount of carbon dioxide (CO2) in the atmosphere is rising. Since the industrial revolution, the CO2 concentration in the atmosphere has increased from approximately 275 parts per million (ppm) to about 378 ppm today. This has been largely the result of fossil fuel burning. It is expected that CO2 levels will continue to rise, and that by the year 2050 these levels will be approximately 550 ppm. CO2 is the raw material for photosynthesis and is known to affect plant growth and development. 2. The amount of nitrogen moving through terrestrial ecosystems has increased in the recent past. While natural "background" levels of nitrogen fixation have remained constant, human additions to the system through fertilizer production and fossil fuel use have increased dramatically. Nitrogen is a key nutrient for plant growth and plays a critical role in plant community structure and composition in many environments. 3. Biodiversity levels are falling. While the research and data are not as complete as they are for CO2 and nitrogen, data indicate that the number of species globally, is being reduced. Perhaps more important for ecosystem function, diversity levels on local to regional scales have fallen due to land use change, biotic invasion and many other drivers. While much is known about how each of these factors affects ecosystem functioning, many questions remain. There is also little data on how these issues affe
Gradients1-KOK1606_14C-NPP_2020-03-04_V1.3
<p>Cruise Name: KOK1606, Gradients 1.0.</p> <p>Project: Simons Foundation - Gradients NPSG</p> <p>Standard HOT protocols were used to measure in vitro primary productivity (PP) via the 14C radiotracer method [Karl et al., 1996]. Water samples were collected from 15m before dawn and incubated on deck in incubators screened to ~50% of surface irradiance and plumbed with flow through surface seawater for temperature regulation. Duplicate 500-ml bottles were incubated in the incubator for ~12hr and 24hr, light bottles were paired with dark bottles. Parallel samples were taken in duplicate to examine the influence of reduced light on PP for all stations. Duplicate 500-ml bottles were incubated inside mesh bags that reduced the light availability to ~25%. A time zero sample was taken at each station to ensure acidification was complete. Following dawn to dusk or dawn to dawn incubations, each sample was filtered onto a 25mm glass fiber filter. Filters were acidified with 1 ml of 2N hydrochloric acid in a fume hood for 12 hr to remove inorganic 14C after which 10 ml of Ultima Gold scintillation fluid was added to each sample. Radioactivity was determined using a Perkins Elmer 2600 liquid scintillation counter. The rate of PP was calculated by multiplying the percent of carbon labeled by the total carbon available for photosynthesis (e.g. dissolved inorganic carbon, DIC, calculated from SST and salinity measured at each station as per Lee et al. [2006]) and dividing by incubation time (t = 1 day). Rate measurements in light bottles were corrected to remove the rate measured in parallel dark bottles. Abbreviations for rate measurements are in the variable metadata. All rates are in units mg C m-3; ‘stdev’ refers to the standard deviation of duplicates for each incubation type, whereas ‘stdev-p’ refers to the propagated standard deviation. NaN’s represent stations or samples where rate measurements were not conducted.</p>
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