Die biologische Aktivität des Bodens und ihre experimentelle Kennzeichnung

Koepf, H.

doi:10.1002/jpln.19540640207

Cited by 36 publications

(5 citation statements)

References 10 publications

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“…It does not reflect the metabolic activity which does not result in complete oxidation, nor the loss of C0 2 in drainage water. Annual respiration cycles from the forest floor are positively correlated with and primarily controlled by the annual cycle of temperature (Witkamp 1966b) and to a lesser but significant degree by moisture conditions, substrate age, and microbial density (Koepf 1954, Turlyun 1958, Loub 1960, Witkamp 1966a, Woodwell and Dykeman 1966. In analogy to the annual cycles, daily cycles in C0 2 evolution caused by daily temperature cycles may be expected.…”

Section: Introductionmentioning

confidence: 98%

Cycles of Temperature and Carbon Dioxide Evolution From Litter and Soil

Witkamp¹

1969

Ecology

103

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Periodic measurement of CO2 evolution from various biotopes reveals a daily cycle in soil respiration with a predawn minimum and an afternoon maximum that parallels the daily temperature cycle. A second maximum occasionally occurs between midnight and dawn when soil temperatures exceed temperature of the surface air. This predawn flush may result from thermal convection of CO2—rich subsurface air to the surface. The time of measurement must be considered for comparisons of rates of CO2 evolution from different sites, and measurements should be made over a 24—hr period for estimates of daily CO2 evolution.

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Section: Introductionmentioning

confidence: 98%

Cycles of Temperature and Carbon Dioxide Evolution From Litter and Soil

Witkamp¹

1969

Ecology

103

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“…However, the integration of the SIR approach with a NDIR CO 2 sensor-based system for soil respiration measurements has not been reported yet. Currently, portable infrared gas analyzers (IRGAs) [ 56 ] have been integrated in open and closed chambers to develop commercially open (e.g., CFX-1, PP-Systems, Amesbury, MA, USA) and closed chambers (e.g., Li-8100, Li-Cor, Lincoln, NE, USA) to measure soil CO 2 efflux in-situ . The cost of these systems is a major setback as compared to the proposed NDIR CO 2 sensor-based system.…”

Section: Resultsmentioning

confidence: 99%

Development of an NDIR CO2 Sensor-Based System for Assessing Soil Toxicity Using Substrate-Induced Respiration

Kaur

Adamchuk

Whalen

et al. 2015

Sensors

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The eco-toxicological indicators used to evaluate soil quality complement the physico-chemical criteria employed in contaminated site remediation, but their cost, time, sophisticated analytical methods and in-situ inapplicability pose a major challenge to rapidly detect and map the extent of soil contamination. This paper describes a sensor-based approach for measuring potential (substrate-induced) microbial respiration in diesel-contaminated and non-contaminated soil and hence, indirectly evaluates their microbial activity. A simple CO2 sensing system was developed using an inexpensive non-dispersive infrared (NDIR) CO2 sensor and was successfully deployed to differentiate the control and diesel-contaminated soils in terms of CO2 emission after glucose addition. Also, the sensor system distinguished glucose-induced CO2 emission from sterile and control soil samples (p ≤ 0.0001). Significant effects of diesel contamination (p ≤ 0.0001) and soil type (p ≤ 0.0001) on glucose-induced CO2 emission were also found. The developed sensing system can provide in-situ evaluation of soil microbial activity, an indicator of soil quality. The system can be a promising tool for the initial screening of contaminated environmental sites to create high spatial density maps at a relatively low cost.

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“…The first soil respiration system using an IRGA was an open system developed by H. Koepf (1953a). This first open dynamic system gave promising results (Koepf, 1953b(Koepf, , 1954, but was only useful for stationary measurements close to the laboratory, because the IRGA alone was 115 cm high and weighed about 50 kg. In addition, the system needed grid power.…”

Section: Tmentioning

confidence: 99%