HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free An erratum has been published Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Bremer, D. J. Articles by Ham, J. M. Search for Related Content PubMed Articles by Bremer, D. J. Articles by Ham, J. M. Agricola Articles by Bremer, D. J. Articles by Ham, J. M. Related Collections Agroclimatology Turfgrass Plant and Environment Interactions

MEASUREMENT AND PARTITIONING OF IN SITU CARBON DIOXIDE FLUXES IN TURFGRASSES USING A PRESSURIZED CHAMBER

^a Dep. of Hortic., Forestry and Recreation Resour., 2021 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506
^b Dep. of Agron., 2004 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506

View larger version (20K): [in a new window]   Fig. 1. Conceptual diagram that illustrates the design of the pressurized chamber system. A variable-flow air pump and micromanometer were used to regulate chamber pressure. A mass flow meter was used to monitor the air flow into the chamber, and results were used to correct fluxes for the effect of gas concentration dilution in the chamber.

View larger version (21K): [in a new window]   Fig. 2. Apparent values in perennial ryegrass of (A) net ecosystem exchange of CO2 (NEE; sunlit chamber) and (B) the sum of canopy and soil respiration (Rc + Rs; shaded chamber) in response to changes in chamber pressure. The apparent increase in NEE and decrease in Rc + Rs with chamber pressure were caused by the corresponding suppression of (C) soil respiration entering the chamber (Rs; bare soil); the bare soil area was surrounded closely by perennial ryegrass. Note: Scale of y axis of 2B is different from 2A and 2C.

View larger version (19K): [in a new window]   Fig. 3. Measurements of soil respiration as a function of increasing chamber pressure. Soils were (A) bare silt loam surrounded by Kentucky bluegrass, (B) sand between crowns of big bluestem, and (C) sand in an area devoid of vegetation. Note: Scale of y axis of 3A is different from 3B and 3C.

View larger version (23K): [in a new window]   Fig. 4. Comparison of CO2 fluxes measured sequentially with the unmodified chamber (normal operation; sunlit) and then with the modified chamber (pressurized; sunlit) in perennial ryegrass (PR), Kentucky bluegrass (KBG), and tall fescue (TF). PR and TF were measured on multiple dates.