scholarly journals Automatic gas analysis system for continuous monitoring of oxygen and carbon dioxide exchange in terrestrial ecosystems. [Measurement of CO/sub 2/ production and O/sub 2/ consumption by small terrestrial vertebrates in natural habitat]

1977 ◽  
Author(s):  
J. C. Randolph ◽  
F. M. Rau
Keyword(s):  
Carbon Dioxide ◽  
Continuous Monitoring ◽  
Natural Habitat ◽  
Terrestrial Ecosystems ◽  
Gas Analysis ◽  
Carbon Dioxide Exchange ◽  
Terrestrial Vertebrates ◽  
Analysis System

scholarly journals Photosynthesis of Tropical Pasture Plants II. Temperature and Illuminance History

1971 ◽  
Vol 24 (4) ◽  
pp. 1065 ◽  
Author(s):  
MM Ludlow ◽  
GL Wilson
Keyword(s):  
Carbon Dioxide ◽  
Water Vapour ◽  
Gas Analysis ◽  
Controlled Environment ◽  
Tropical Pasture ◽  
Two Temperatures ◽  
Analysis System ◽  
Pasture Plants

Grasses and legumes were grown at two temperatures in controlled-environment rooms and at three illuminances (obtained by shading) in a glasshouse. Carbon dioxide and water vapour exchange of leaves were measured in an open gas analysis system.

scholarly journals Endogenous circadian regulation of carbon dioxide exchange in terrestrial ecosystems

2012 ◽  
Vol 18 (6) ◽  
pp. 1956-1970 ◽  
Author(s):  
Víctor Resco Dios ◽  
Michael L. Goulden ◽  
Kiona Ogle ◽  
Andrew D. Richardson ◽  
David Y. Hollinger ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Terrestrial Ecosystems ◽  
Carbon Dioxide Exchange ◽  
Circadian Regulation

Seasonal dynamics of carbon dioxide exchange in a mixed grassland ecosystem

1978 ◽  
Vol 56 (17) ◽  
pp. 1999-2005 ◽  
Author(s):  
R. E. Redmann
Keyword(s):  
Carbon Dioxide ◽  
Air Temperature ◽  
Net Photosynthesis ◽  
Typical Feature ◽  
Gas Analysis ◽  
Dew Point ◽  
Carbon Dioxide Exchange ◽  
Dew Point Temperature ◽  
Growing Seasons ◽  
Dominant Grasses

Carbon dioxide exchange of a mixed grassland sward dominated by Agropyron dasystachyum and A. smithii was measured over two growing seasons using field chambers and infrared gas analysis. Net photosynthesis of the sward began in late April and rose to a peak in early July ([Formula: see text] ground area h−1). Drought during the later part of the summer, a typical feature of the climate of the region, caused net photosynthesis to decline drastically. Air temperature and reduced green leaf area inhibited photosynthesis early and late in the growing season. A multiple regression analysis showed that soil moisture and air temperature together accounted for 44% of the variability in net photosynthesis. Solar radiation and dew-point temperature explained an additional 16%. The ability of the dominant grasses to adapt to fluctuations in water availability is discussed.

scholarly journals INVESTIGATION AND EVALUATION OF CARBON DIOXIDE EMISSIONS FROM SOIL IN NERIS REGIONAL PARK / ANGLIES DVIDEGINIO EMISIJŲ IŠ DIRVOŽEMIO NERIES REGIONINIAME PARKE TYRIMAI IR VERTINIMAS / ИССЛЕДОВАНИЕ И ОЦЕНКА ВЫБРОСОВ ДВУОКИСИ УГЛЕРОДА ИЗ ПОЧВЫ В РЕГИОНАЛЬНОМ ПАРКЕ «НЕРИС»

2011 ◽  
Vol 19 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Pranas Baltrėnas ◽  
Mantas Pranskevičius ◽  
Arvydas Lietuvninkas
Keyword(s):  
Carbon Dioxide ◽  
Research Methods ◽  
Carbon Dioxide Emissions ◽  
Co2 Emission ◽  
Gas Analysis ◽  
Field Conditions ◽  
Measuring Instrument ◽  
Agricultural Ecosystems ◽  
Co2 Balance ◽  
Analysis System

Soils release around 20% of the total CO2 content to the atmosphere; consequently, forest and agricultural ecosystems have a big influence on CO2 balance. Until recently, the majority of CO2 measurements of Lithuanian soils were either carried out under laboratory conditions or obtained by applying outdated research methods. CO2 investigations in Neris Regional Park were carried out under field conditions during plant vegetation by using the CO2 emission measuring instrument ADC BioScientific and soil chamber, the analysis system of which includes a metal collar of ∼0.9 m2 area. This infrared gas analysis system performs measurements within the range of 0–2000 ppm, with an error of 1 ppm. The emission's error is a mere ±2%. The system allows making reliable measurements within the temperature range of −5 °C to +50 °C. Santrauka Apie 20% viso CO2 kiekio, patenkančio įatmosferą, išskiria dirvožemiai, todėl miškų bei agroekosistemos daro nemažįtaką CO2 balansui. Lietuvoje iki pastarųjų metų dirvožemio CO2 matavimai daugeliu atveju buvo atliekami laboratorinėmis sa˛lygomis, arba duomenys surinkti taikant senstelėjusius tyrimų metodus. CO2tyrimai Neries regioniniame parke atlikti lauko sąlygomis augalų vegetacijos metu matuojant ADC BioScientific CO2 emisijos matuokliu. Šios infraraudonųjų spindulių dujų analizavimo sistemos skalė 0–2000 ppm, paklaida 1 ppm. Emisijos paklaida tesudaro ±2%. Matavimai šiuo prietaisu patikimi −5–+50 °C temperatūroje. Резюме Около 20% CO2 от общего объема попадает в атмосферу из почвы, поэтому столь велико влияние лесов и агроэкосистем на баланс CO2. В Литве измерения эмиссий CO2 с поверхности почв проводились в лабораторных условиях либо применялись старые методы исследования. В региональном парке «Нерис» эмиссии CO2 с поверхности почв измерялись новым прибором ADC BioScientific. Для исследований применялся прибор с системой инфракрасного газового анализа по шкале от 0 до 2000 частей на миллион. Выбросы учитывались с погрешностью ±2%. Устройство позволяет надежно измерять эмиссии CO2 в диапазоне температур от −5 °C до +50 °C.

scholarly journals Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land

2020 ◽  
Author(s):  
Yayi Niu ◽  
Yuqiang Li ◽  
Hanbo Yun ◽  
Xuyang Wang ◽  
Xiangwen Gong ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Terrestrial Ecosystems ◽  
Soil Heat Flux ◽  
Carbon Dioxide Exchange ◽  
Co2 Absorption ◽  
Horqin Sandy Land ◽  
Sandy Land ◽  
Environmental Controls ◽  
Annual Scale ◽  
Sandy Grassland

Abstract. Grassland ecosystems are major components of the terrestrial ecosystems in arid and semiarid regions, and play important roles in the regional carbon dioxide (CO2) balance and cycle. Sandy grasslands are sensitive to climate change, yet the magnitudes, patterns, and environmental controls of their CO2 flows are poorly understood. Here, we report the results from continuous year-round CO2 observations in 5 years from a sandy grassland in the Horqin Sandy Land. The result showed that the sandy grassland was a CO2 source at annual scale (with mean annual net ecosystem CO2 exchange (NEE) of 48.88 ± 8.10 g C m−2 yr−1 in completely year 2015, 2016 and 2018), the total precipitation was the most important factor for NEE. At the seasonal scale, the sandy grassland showed a CO2 absorption during the summer, and in the rest of the seasons, it were all expressed as CO2 release. The main environmental factor of NEE were temperature and soil water content (SWC) in spring, radiation in summer, soil heat flux (SHF) and temperature in autumn, and SWC and temperature in winter. At the diel scale, net radiation (Rn) was the most important factor of NEE in all seasons. The sandy grassland may have been a net annual CO2 source at annual scale because the study site is recovering from degradation, thus vegetation productivity is still relatively low. Therefore, the ecosystem has not yet transitioned to a CO2 sink and long-term observations will be necessary to reveal the true source or sink intensity and its response to environmental and biological factors.

Effect of the 2018 drought on methane and carbon dioxide exchange of northern mire ecosystems

2020 ◽  
Author(s):  
Janne Rinne ◽  
Juha-Pekka Tuovinen ◽  
Leif Klemendtsson ◽  
Mika Aurela ◽  
Jutta Holst ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Gas ◽  
Water Table ◽  
Methane Emission ◽  
Radiative Forcing ◽  
Western Europe ◽  
Terrestrial Ecosystems ◽  
Carbon Dioxide Exchange ◽  
The North ◽  
Ghg Fluxes

<p>In 2018, North-Western Europe experienced very dry and warm summer. These conditions can have considerable effects on the functioning and greenhouse gas exchange of terrestrial ecosystems. Peat-forming wetlands, or mires, are a characteristic component of the North-European boreal landscape, and crucial for long-term carbon storage as well as for methane emission. We have analyzed the effect of the drought on greenhouse gas (GHG) exchange of five North European mire ecosystems in Sweden and Finland in 2018. The low precipitation and high summer temperatures in Fennoscandia led to a lowered water table in majority of the mires. This lowered both carbon dioxide (CO<sub>2</sub>) uptake and methane (CH<sub>4</sub>) emission during 2018, turning many of the mires from CO<sub>2</sub>sinks to sources during this year. The changes in methane emission and total GHG exchange, expressed as CO<sub>2</sub>equivalent, were significantly correlated with change in water table position. The calculated time-evolving radiative forcing due to the changes in GHG fluxes in 2018 showed that the drought-induced changes in GHG fluxes first resulted in a cooling effect lasting 15-50 years, due to the lowered CH<sub>4</sub>emission, which was followed by longer-term warming phase due to the lower CO<sub>2 </sub>uptake in 2018.</p><p> </p>

scholarly journals Photosynthesis of Tropical Pasture Plants I. Illuminance, Carbon Dioxide Concentration, Leaf Temperature, and Leaf-Air Vapour Pressure Difference

1971 ◽  
Vol 24 (3) ◽  
pp. 449 ◽  
Author(s):  
M M Ludlow ◽  
GL Wilson
Keyword(s):  
Carbon Dioxide ◽  
Vapour Pressure ◽  
Pressure Difference ◽  
Carbon Dioxide Concentration ◽  
Gas Analysis ◽  
Leaf Temperature ◽  
Tropical Pasture ◽  
Analysis System ◽  
Vapour Pressure Difference ◽  
Pasture Plants

Carbon dioxide and water vapour exchange of attached, young, fully expanded leaves of tropical pasture species were measured in an open gas analysis system. The influence of illuminance, carbon dioxide concentration, leaf temperature, and leaf-air vapour pressure difference on net photosynthetic rate and carbon dioxide transfer resistances was studied.

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