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Dai, Kun; Johnson, Chris; Driscoll, Charles T.

doi:10.1023/a:1010697518227

Cited by 91 publications

(16 citation statements)

References 64 publications

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“…This suggests increased organic matter decomposition and maturation after harvest (Dai et al, 2001;Hannam et al, 2005;Kalbitz et al, 2004), with the C/N and C/SOM ratios decreasing as C is preferentially lost from SOM (Johnson, 1995). In the forest floor, the N/SOM ratio was significantly higher in regenerating than in cleared and control stands, which may indicate intense oxidation.…”

Section: Organic Matter Composition Indicators Of Decompositionmentioning

confidence: 96%

Effects of Forest Harvest on Soil Carbon and Related Variables in Canadian Spodosols

Grand

Lavkulich

2012

Soil Science Society of America Journal

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Knowledge about soil organic carbon (SOC) response to forest harvest in conifer stands is limited. The objective of this study was to determine the short-to medium-term effects of bole-only clearcut harvest on SOC and related variables in a Douglas fir [Pseudotsuga menziesii (Mirbel) Franco]-dominated forest of southwestern British Columbia. We collected soil samples from control (mature forest), cleared (harvested 1-5 yr before sampling), and regenerating (harvested 8-15 yr before sampling) stands and measured SOC, pH, texture, moisture, total N, loss-on-ignition, effective cation exchange capacity (CEC^), and pyrophosphate-extractable Fe and Al. We found that SOC stocks in the forest floor were higher in cleared and regenerating plots than in control. The mineral subsoil played an important role in the overall response of SOC storage after harvest. In mineral horizons, SOC concentration was higher in cleared plots and similar to control levels in regenerating plots. Treatment effects were restricted to SOC associated with the sand size fractions. This suggests that clearcutting resulted in additional soil organic matter (SOM) inputs to the mineral soil, but that these inputs were not stabilized or retained in regenerating plots. Harvest also affected bulk organic matter composition. The C/N and C/SOM ratios were lower in regenerating plots while tbe CEC^/C ratio was higher, suggesting an increase in organic matter maturity and oxidation.

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Section: Organic Matter Composition Indicators Of Decompositionmentioning

confidence: 96%

Effects of Forest Harvest on Soil Carbon and Related Variables in Canadian Spodosols

Grand

Lavkulich

2012

Soil Science Society of America Journal

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“…Because data-dependent acquisition and label-free quantitation (LFQ) can miss individual sample measurements with a left-censoring (informative missingness) bias, the LFQ intensity quantitative data from MaxQuant for the n=6 samples were filtered to limit missingness, and then missing values were imputed as previously described. 25,26,27 Imputation of missing protein LFQ intensity values was performed using the imputation algorithm of Perseus 27 as implemented in R and previously reported. 25 Proteins were considered to have a detectable fold change if the fold change (FC) was a minimum of log2(1.286), 28.6% or more, represented by log 2 (DKO/WT) values of −0.36 and 0.36 or for downregulated and upregulated proteins, respectively.…”

Section: Data Processing and Determination Of Differential Protein Abundance In Gpr37/gpr37l1 Double Knockout Vs Wild-typementioning

confidence: 99%

Quantitative Proteomics Reveal an Altered Pattern of Protein Expression in Brain Tissue from Mice Lacking GPR37 and GPR37L1

et al. 2020

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GPR37 and GPR37L1 are glia-enriched GPCRs that have been implicated in several neurological and neurodegenerative diseases. To gain insight into the potential molecular mechanisms by which GPR37 and GPR37L1 regulate cellular physiology, proteomic analyses of whole mouse brain tissue from wild-type (WT) versus GPR37/GPR37L1 double knockout (DKO) mice were performed in order to identify proteins regulated by the absence versus presence of these receptors (data are available via ProteomeXchange with identifier PXD015202). These analyses revealed a number of proteins that were significantly increased or decreased by the absence of GPR37 and GPR37L1. One of the most decreased proteins in the DKO versus WT brain tissue was S100A5, a calcium-binding protein, and the reduction of S100A5 expression in KO brain tissue was validated via Western blot. Co-expression of S100A5 with either GPR37 or GPR37L1 in HEK293T cells did not result in any change in S100A5 expression but did robustly increase secretion of S100A5. To dissect the mechanism by which S100A5 secretion was enhanced, cells co-expressing S100A5 with the receptors were treated with different pharmacological reagents. These studies revealed that calcium is essential for the secretion of S100A5 downstream of GPR37 and GPR37L1 signaling, as treatment with BAPTA-AM, an intracellular Ca 2+ chelator, reduced S100A5 secretion from transfected HEK293T cells. Collectively these findings provide a panoramic view of proteomic changes resulting from loss of GPR37 and GPR37L1 and also impart mechanistic insight into the regulation of S100A5 by these receptors, thereby shedding light on the functions of GPR37 and GPR37L1 in brain tissue.

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“…The NMR spectra were divided into seven regions representing the different chemical environments of the 13 C nucleus (Table S1). The ratios were calculated using percentage intensity values as follows [43,44]:…”

Section: Solid-state 13 C Nuclear Magnetic Resonance Spectroscopy Anamentioning

confidence: 99%

Nitrogen Addition Affects Soil Respiration Primarily through Changes in Microbial Community Structure and Biomass in a Subtropical Natural Forest

Zhou

Liu

Xie

et al. 2019

Forests

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Forest soil respiration plays an important role in global carbon (C) cycling. Owing to the high degree of C and nitrogen (N) cycle coupling, N deposition rates may greatly influence forest soil respiration, and possibly even global C cycling. Soil microbes play a crucial role in regulating the biosphere–atmosphere C exchange; however, how microbes respond to N addition remains uncertain. To better understand this process, the experiment was performed in the Castanopsis kawakamii Hayata Nature Reserve, in the subtropical zone of China. Treatments involved applying different levels of N (0, 40, and 80 kg ha−2 year−1) over a three-year period (January 2013–December 2015) to explore how soil physicochemical properties, respiration rate, phospholipid fatty acid (PLFA) concentration, and solid state 13C nuclear magnetic resonance responded to various N addition rate. Results showed that high levels of N addition significantly decreased soil respiration; however, low levels of N addition significantly increased soil respiration. High levels of N reduced soil pH and enhanced P and C co-limitation of microorganisms, leading to significant reductions in total PLFA and changes in the structure of microbial communities. Significant linear relationships were observed between annual cumulative respiration and the concentration of microbial biomass (total PLFA, gram-positive bacteria (G+), gram-negative bacteria (G−), total bacteria, and fungi) and the microbial community structure (G+: G− ratio). Taken together, increasing N deposition changed microbial community structure and suppressed microbial biomass, ultimately leading to recalcitrant C accumulation and soil C emissions decrease in subtropical forest.

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Untitled

Cited by 91 publications

References 64 publications

Effects of Forest Harvest on Soil Carbon and Related Variables in Canadian Spodosols

Effects of Forest Harvest on Soil Carbon and Related Variables in Canadian Spodosols

Quantitative Proteomics Reveal an Altered Pattern of Protein Expression in Brain Tissue from Mice Lacking GPR37 and GPR37L1

Nitrogen Addition Affects Soil Respiration Primarily through Changes in Microbial Community Structure and Biomass in a Subtropical Natural Forest

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