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27 results for “necromass”
LBA-ECO TG-07 Fallen and Standing Necromass, Tapajos, Cauaxi, Juruena Forests, Brazil
This data set reports the characterization of fallen necromass as the volume and density of coarse woody debris (CWD), and standing necromass as the volume and density of standing dead trees. Measurements were made in undisturbed and logged forest areas of the Tapajos National Forest, and Cauaxi Forest, Para, Brazil, and Juruena Forest, Mato Grosso, Brazil from 2002-2004. Fallen and standing necromass were classified into one of five categories according to its state of decomposition. There are two comma-delimited ASCII data files with this data set: two files contain the sampling information, decomposition state, and DBH measurements. There are also two files provided as companion data files which provide sampling transect descriptions.
Delta-X: Aboveground Biomass and Necromass across Wetlands, MRD, Louisiana, 2021, V2
This dataset contains total aboveground biomass (AGB) and necromass (AGN), and total carbon, total nitrogen, and total phosphorus content of aboveground biomass (AGB) and necromass (AGN) samples collected from herbaceous wetlands in the Atchafalaya and Terrebonne basins in southeastern coastal Louisiana during 2021. Field measurements were conducted at three sites in the Atchafalaya basin and three sites in the Terrebonne basin. Five of the sites are adjacent to sites from the Coastwide Reference Monitoring System (CRMS). The other site is located in Wax Lake Delta (WLD) without appropriate adjacent CRMS sites. All AGB and AGN plant material within each plot was clipped at soil level, stored in plastic bags, and transported to the laboratory for further analyses. Herbaceous wetland sites in both basins were chosen to represent a salinity gradient including freshwater, brackish, and saline ecosystems. These data cover the period 2021-03-19 to 2021-03-31 (spring) and 2021-08-19 to 2021-08-27 (fall).
Delta-X: Belowground Biomass and Necromass across Wetlands, MRD, LA, USA, 2021, V2
This dataset contains total belowground biomass (BGB) and necromass (BGN), and total carbon, total nitrogen, and total phosphorus content of samples collected from herbaceous wetlands in the Atchafalaya and Terrebonne basins of the Mississippi River Delta in southeastern coastal Louisiana, U.S., during March and August 2021. The data were collected during the Delta-X Spring and Fall deployments. Field measurements were conducted at three sites in the Atchafalaya basin and three sites in the Terrebonne basin. Five of the sites are adjacent to sites from the Coastwide Reference Monitoring System (CRMS). The other site is located in Wax Lake Delta (WLD) without appropriate adjacent CRMS sites. Herbaceous wetland sites in both basins were chosen to represent a salinity gradient including freshwater, brackish, and saline ecosystems. Root biomass samples were collected using a gouge soil auger.
Melanization of fungal necromass drives the upregulation of multiple chitinase, protease, and laccase genes when being degraded by Trichoderma reesei
GEO Series GSE263516. Trichoderma reesei. 9 samples. Type: Expression profiling by high throughput sequencing.
Data from: The vertical distribution and control of microbial necromass carbon in forest soils
<p><span><b>Aim:</b> Forest soils contain large amounts of terrestrial organic carbon (C), but the formation pathway of soil organic C (SOC) remains unclear. Recent evidence suggests that microbial necromass is a significant source of SOC, yet a global quantitative assessment across the whole-soil profile is lacking. We aimed to assess the vertical distribution and control of microbial-derived SOC in forest soils.</span></p> <p><span><b>Location:</b> Global forests.</span></p> <p><span><b>Time period:</b> 1996-2019.</span></p> <p><span><b>Major taxa studied:</b> Soil microbial necromass carbon.</span></p> <p><span><b>Methods:</b> We evaluated the proportions of fungal and bacterial necromass C in total SOC in the litter layer, O horizon soil, and various depths of mineral soil in forests using microbial biomarker (glucosamine and muramic acid) data.</span></p> <p><span><b>Results:</b> The total microbial necromass C increased significantly with soil depth, ranging from 30% of SOC in O horizon soil to 62% of SOC in mineral soils below 50 cm. However, only bacterial necromass C followed this increasing trend with soil depth; fungal necromass C showed little variation across the whole-soil profile. Higher fungal and bacterial necromass C was observed in soils with lower C/N ratios and smaller aggregate sizes. Soil C/N ratio and microbial biomass C dominantly determined microbial necromass C in surface soil (above 20 cm), but soil clay content was the primary factor in subsoil (below 20 cm).</span></p> <p><span><b>Main conclusions: </b>Microbial necromass C accounted for high percentages of the total SOC in forest soils (particularly at depths >20 cm), but its long-term stabilization may be governed by different mechanisms at different soil horizons. Substrate quality regulates microbial activity and then controls biomass turnover in surface soil, while aggregate occlusion could facilitate mineral protection of microbial necromass C in subsoil. These differential controls of microbial-derived organic C could be applied in Earth system studies for predicting soil organic C dynamics in forests.</span></p>
Data from: The vertical distribution and control of microbial necromass carbon in forest soils
Open the record for dataset details and reuse information.
Transcriptomic analyses of bacterial growth on fungal necromass reveals different microbial community niches during degradation
GEO Series GSE268149. Serratia marcescens; Chitinophaga pinensis; Cellvibrio japonicus. 48 samples. Type: Expression profiling by high throughput sequencing.
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