scholarly journals Nitrogen Biogeochemistry in Lakes – Chemical and Biological Drivers and Developing Techniques to Explicitly Measure Concurrent Processes

2021 ◽  
Author(s):  
Yat-Fung (Jeremy) Lau
Keyword(s):  
Nitrogen Cycling ◽  
Community Composition ◽  
Nutrient Loading ◽  
Chamber System ◽  
Benthic Chamber ◽  
Concurrent Processes ◽  
Flow Through

A benthic chamber system was developed to measure all major nitrogen cycling processes in lakes. The system coupled advantages of flow-through systems common in core incubations with those of Nutrient loading ratios (Si:N and P:N) and community composition of herbivores (

scholarly journals Nitrogen Biogeochemistry in Lakes – Chemical and Biological Drivers and Developing Techniques to Explicitly Measure Concurrent Processes

2021 ◽  
Author(s):  
Yat-Fung (Jeremy) Lau
Keyword(s):  
Nitrogen Cycling ◽  
Community Composition ◽  
Nutrient Loading ◽  
Chamber System ◽  
Benthic Chamber ◽  
Concurrent Processes ◽  
Flow Through

A benthic chamber system was developed to measure all major nitrogen cycling processes in lakes. The system coupled advantages of flow-through systems common in core incubations with those of Nutrient loading ratios (Si:N and P:N) and community composition of herbivores (

In situ Enclosure Experiment Using a Benthic Chamber System to Assess the Effect of High Concentration of CO2 on Deep-Sea Benthic Communities

2005 ◽  
Vol 61 (5) ◽  
pp. 835-843 ◽  
Author(s):  
Hiroshi Ishida ◽  
Yuji Watanabe ◽  
Tatsuo Fukuhara ◽  
Sho Kaneko ◽  
Kazushi Furusawa ◽  
...  
Keyword(s):  
Deep Sea ◽  
Benthic Communities ◽  
Chamber System ◽  
High Concentration ◽  
Enclosure Experiment ◽  
Benthic Chamber

Changes in the abundance and community composition of different nitrogen cycling groups in response to fumigation with 1,3-dichloropropene

2019 ◽  
Vol 650 ◽  
pp. 44-55 ◽  
Author(s):  
Wensheng Fang ◽  
Dongdong Yan ◽  
Qiuxia Wang ◽  
Bin Huang ◽  
Zongjie Ren ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Community Composition

scholarly journals Effects of temperature and fertilization on nitrogen cycling and community composition of an urban lawn

2008 ◽  
Vol 14 (9) ◽  
pp. 2119-2131 ◽  
Author(s):  
NEETA S. BIJOOR ◽  
CLAUDIA I. CZIMCZIK ◽  
DIANE E. PATAKI ◽  
SHARON A. BILLINGS
Keyword(s):  
Nitrogen Cycling ◽  
Community Composition ◽  
Effects Of Temperature

scholarly journals Microbial Community Composition and Denitrifying Enzyme Activities in Salt Marsh Sediments

2008 ◽  
Vol 74 (24) ◽  
pp. 7585-7595 ◽  
Author(s):  
Yiping Cao ◽  
Peter G. Green ◽  
Patricia A. Holden
Keyword(s):  
Microbial Community ◽  
Salt Marsh ◽  
Carbon Content ◽  
Community Composition ◽  
Enzyme Activities ◽  
Nutrient Loading ◽  
Microbial Community Composition ◽  
Marsh Sediments ◽  
Salt Marsh Sediments ◽  
And Function

ABSTRACT Denitrifying microbial communities and denitrification in salt marsh sediments may be affected by many factors, including environmental conditions, nutrient availability, and levels of pollutants. The objective of this study was to examine how microbial community composition and denitrification enzyme activities (DEA) at a California salt marsh with high nutrient loading vary with such factors. Sediments were sampled from three elevations, each with different inundation and vegetation patterns, across 12 stations representing various salinity and nutrient conditions. Analyses included determination of cell abundance, total and denitrifier community compositions (by terminal restriction fragment length polymorphism), DEA, nutrients, and eluted metals. Total bacterial (16S rRNA) and denitrifier (nirS) community compositions and DEA were analyzed for their relationships to environmental variables and metal concentrations via multivariate direct gradient and regression analyses, respectively. Community composition and DEA were highly variable within the dynamic salt marsh system, but each was strongly affected by elevation (i.e., degree of inundation) and carbon content as well as by selected metals. Carbon content was highly related to elevation, and the relationships between DEA and carbon content were found to be elevation specific when evaluated across the entire marsh. There were also lateral gradients in the marsh, as evidenced by an even stronger association between community composition and elevation for a marsh subsystem. Lastly, though correlated with similar environmental factors and selected metals, denitrifier community composition and function appeared uncoupled in the marsh.

scholarly journals Multiple Methods to Partition Evapotranspiration in a Maize Field

2017 ◽  
Vol 18 (1) ◽  
pp. 139-149 ◽  
Author(s):  
Youjie Wu ◽  
Taisheng Du ◽  
Risheng Ding ◽  
Ling Tong ◽  
Sien Li ◽  
...  
Keyword(s):  
Steady State ◽  
Growing Season ◽  
Chamber System ◽  
Multiple Methods ◽  
Maize Field ◽  
System Method ◽  
Flow Through ◽  
Relationship Of ◽  
Further Development ◽  
Isotopic Technique

Abstract Partitioning evapotranspiration (ET) into soil evaporation E and plant transpiration T is important, but it is still a theoretical and technical challenge. The isotopic technique is considered to be an effective method, but it is difficult to quantify the isotopic composition of transpiration δT and evaporation δE directly and continuously; few previous studies determined δT successfully under a non-steady state (NSS). Here, multiple methods were used to partition ET in a maize field and a new flow-through chamber system was refined to provide direct and continuous measurement of δT and δE. An eddy covariance and lysimeter (EC-L)-based method and two isotope-based methods [isotope combined with the Craig–Gordon model (Iso-CG) and isotope using chamber measurement (Iso-M)] were applied to partition ET. Results showed the transpiration fraction FT in Iso-CG was consistent with EC-L at both diurnal and growing season time scales, but FT calculated by Iso-M was less than Iso-CG and EC-L. The chamber system method presented here to determine δT under NSS and isotope steady state (ISS) was robust, but there could be some deviation in measuring δE. The FT varied from 52% to 91%, with a mean of 78% during the entire growing season, and it was well described by a function of LAI, with a nonlinear relationship of FT = 0.71LAI0.14. The results demonstrated the feasibility of the isotope-based chamber system to partition ET. This technique and its further development may enable field ET partitioning accurately and continuously and improve understanding of water cycling through the soil–plant–atmosphere continuum.

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