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10 results for “Biomass C & N”
Biomass, %N, and %C data for the BBC collapse scar for 2003 and 2004
This data set contains biomass measurements for a destructively harvested transect 30 m to the east of the permanent transect from the center of the BBC collapse scar (0m) into the surrounding fire scar (30m) of the Survey Line Fire (burned in June-July 2001). Biomass samples were collected on DOY 231 2004. Two 61 cm x 61 cm plots were harvested on the east and west side of every point along the transect (0, 6, 12, 18, 24, and 30 m). We sorted these above-ground biomass samples into plant type (Sphagnum spp., other mosses, Marchantia spp., Eriophorum vaginatum, Carex spp., Grasses, Betula spp., Salix spp., Potentilla palustris, Ledum groenlandicum, Vaccinium uliginosum, Vaccinium vitis-idaea, Chamaedaphne calyculata, other vascular plants, dead mosses, dead Carex spp., dead Graminoid, dead Potentilla palustris, dead Salix spp., and other litter). Photosynthetic green tissues were separated from the above-ground biomass samples. Samples were dried at 60degC to measure the dry mass. Samples were also analyzed for %C and %N. We oven-dried at 50 - 65degC and ground all samples before analysis. We analyzed samples for %C and %N using a Carlo Erba EA1108 CHNS analyzer (CE Instruments, Milan, Italy) and a COSTECH ECS 4010 CHNS-O analyzer (Costech Analytical Technologies Inc., Valencia, CA, USA). Sample standard errors were +/- 0.01% for nitrogen, +/- 0.45% for carbon. For the biomass transect samples, we analyzed for %C and %N when the samples were more than 10% of the plot biomass allowing for representative sampling of carbon and nitrogen from the dominant plant types. This data set was collected to monitor the change in biomass across the transect to relate this to disturbance, topography, soils, soil moisture and measured fluxes of CO2 and CH4 emissions.
Biomass %N, %C, natural abundance 15N and 13C isotopic signatures for common and rare under- and overstory plants in long unburned and burned (1999) boreal forest stands, Caribou-Poker Creek and Delta Junction
This dataset contains leaf, aboveground stem, and fruit carbon and N concentration and natural abundance isotope data for new and old tissue fractions of common and rare plant species in burned and unburned black spruce forest stands. Stands were located in either Caribou-Poker Creek or Delta Junction, in either unburned areas, or in areas burned in 1999 fires. Biomass was collected between 2000 and 2001 in mid-July at peak biomass.
Post-fire succession in 1994 Hajdukovich Creek Burn: measurements of root biomass, shoot biomass, total plant C content, total plant N content for aspen and spruce
This dataset contains measurements of root biomass, shoot biomass, total plant C, and total plant N of 10 aspen and 10 spruce saplings harvested in one severely burned and one lightly burned site in the 1994 Hajdukovich Creek burn.
Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): leaf C, N, delta-13C, delta-15N at peak biomass; 2009-2019
The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. This data set includes carbon (C) and nitrogen (N) elemental and isotope content in leaves collected from winter warming, summer warming, and control treatment plots at CiPEHR.
Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): leaf SLA, C, N, P, Ca, delta-13C, delta-15N at peak biomass, 2017
The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. This data set includes carbon (C) and nitrogen (N) elemental and isotope content in leaves collected from winter warming, summer warming, and control treatment plots at CiPEHR.
Eight Mile Lake Research Watershed, Thaw Gradient: leaf SLA, C, N, P, Ca, Mg, delta-13C, delta-15N at peak biomass, 2017
In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and dissolved organic carbon, in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems.
Soil microbial biomass C, N in biocrust: A meta-analysis
<p><span>The biological soil crust (biocrust) has many crucial ecological functions in dryland ecosystems. </span><span>Differentiation</span><span> of soil microbial biomass in different ecosystems' biocrust under various climatic and soil conditions remains unknown, restricting our knowledge of biocrust microbiomes regulating terrestrial carbon and nitrogen cycling globally. We selected 255 paired observations from 45 global study sites for meta-analysis to quantify the effect of biocrust type, soil texture, and ecosystem type on soil microbial biomass in biocrust and identify the underlying impact factors. The results showed that</span> <span>biocrust had significantly higher soil microbial carbon and nitrogen contents (SMBC and SMBN, respectively) than bare (non-crust) soil (<em>P</em> < 0.05). Biocrust also significantly increased total nitrogen (TN) (143.68%), soil organic carbon (SOC) and TN ratio (C: N) (9.93%), and soil water content (SWC) (60.18%), and decreased pH (0.72%) (<em>P</em> < 0.05). Overall, the SMBC significantly differed between biocrust type, ecosystem type, and soil texture (<em>P</em> < 0.05). Compared with other biocrust types, lichen crust had the strongest positive effect on SMBC (822.48%). Grassland ecosystems had stronger positive effects on SMBC in biocrust than forest ecosystems, and sand and sandy loam soils had higher SMBC in biocrust than loam soils. Notably, altitude drives the positive effects of biocrust on SMBN and the negative effects of biocrust on SMBC and SMBC and SMBN ratio (SMBC: SMBN). Mean annual temperature (MAT) positively affected SMBC based on regression analysis. Further analysis revealed that SMBC and SMBN positively correlated with SOC, C: N, SWC, and urease activity and negatively correlated with pH. The random forest analysis confirmed that SOC, C: N, and altitude could be considered determinants of SMBC, SMBN, and SMBC: SMBN, respectively. Climatic factors and soil nutrients differently affected soil microbial biomass C, N and their ratio in biocrust. The high contribution of lichen crust to SMBC should be incorporated into regional and global models to predict the effects of climate change on soil carbon budgets in ecosystems worldwide.</span></p>
Soil microbial biomass C, N in biocrust: A meta-analysis
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Global patterns and drivers of soil microbial biomass C, N, and P in terrestrial ecosystems
<p>Soil microbes<strong> </strong>play key roles in driving and regulating nutrient cycling in terrestrial ecosystems. However, a lack of global-scale information regarding the distribution of soil microbial biomass C (SMB C), N (SMB N), and P (SMB P) in terrestrial ecosystems has limited our ability to incorporate the broad-scale soil microbial nutritional properties and the associated processes into biogeochemical models. Here, we synthesized a global dataset including 3,801 observations for SMB C, 3,154 observations of SMB N, and 2,429 observations of SMB P in the top 0–30 cm soil depth. Based on this comprehensive global dataset, we generated quantitative and spatially explicit maps of SMB C, N, and P across terrestrial ecosystems using a random forest approach. In general, the global mean values of SMB C, N, and P concentrations were 693.0 mg kg<sup>-1</sup>, 89.5 mg kg<sup>-1</sup>, and 35.5 mg kg<sup>-1</sup>, respectively. These mean values belie a significantly spatial heterogeneity of these concentrations across biomes and a clear latitudinal trend (wherein SMB C, N, and P increase in cold and high latitude environments along with the large soil organic carbon, SOC). SOC was the most important factor regulating SMB C, N, and P at a global scale. At the global scale, the storage of SMB C, N, and P was estimated to be 23.13 Pg C, 3.93 Pg N, and 2.16 Pg P in the top 0–30 cm soil surface, respectively. Our global maps of SMB C, N, and P presented here can be used to constraint Earth system models, and provide the first step forward to predict the roles of soil microbial nutrients in terrestrial nutrient cycling.</p>
Global patterns and drivers of soil microbial biomass C, N, and P in terrestrial ecosystems
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