Empirical Relationships Between Light Intensity and Crop Net Carbon Exchange Rate at the Leaf and Full Canopy Scale: Towards Integration of a Higher Plant Chamber in MELiSSA

2005 ◽  
Author(s):  
Geoffrey Waters ◽  
Danuta Gidzinski ◽  
Youbin Zheng ◽  
Michael Dixon
Keyword(s):  
Exchange Rate ◽  
Light Intensity ◽  
Carbon Exchange ◽  
Higher Plant ◽  
Empirical Relationships ◽  
Net Carbon Exchange

scholarly journals Net Carbon Exchange Rate of Fragaria Species, Synthetic Octoploids, and Derived Germplasm

2012 ◽  
Vol 137 (3) ◽  
pp. 202-209 ◽  
Author(s):  
Rebecca M. Harbut ◽  
J. Alan Sullivan ◽  
John T.A. Proctor ◽  
Harry J. Swartz
Keyword(s):  
Exchange Rate ◽  
Light Response ◽  
Research Station ◽  
Carbon Exchange ◽  
Light Conditions ◽  
Response Curves ◽  
Low Light ◽  
Light Response Curves ◽  
Single Leaf ◽  
Net Carbon Exchange

The net carbon exchange rate (NCER) of Fragaria species, synthetic octoploids [SO (interspecific hybrids)], F1 (SO × cultivar), and first outcross [OC1 (F1 × cultivar)] hybrids were evaluated in both field and greenhouse conditions. Plants were grown in a field trial at the Elora Research Station in Ontario, Canada, for one season and then plants were dug and moved into a greenhouse where the trial was repeated during the next season. Single leaf photosynthesis measurements and light response curves were generated at different stages of plant development. Photosynthetic capacity of the species was related to the ecological background of the species with sun-adapted species having higher rates compared with the shade-adapted species. The Fragaria species and introgressed hybrids (F1 and OC1) had significantly higher NCERs compared with the cultivars with rates 28% and 23% higher, respectively. Species and hybrids also appear to have increased adaptability to both high and low light conditions. These increases in NCER may be a heterotic effect because NCER of the hybrids were consistently higher compared with the midparent values and in some cases, they were higher than the high parent. These results suggest that the introgression of lower-ploidy Fragaria species into the cultivated strawberry (Fragaria ×ananassa) may lead to increased NCER and light adaptability.

Response of Net Carbon Exchange Rate of Soybean to Ozone at Different Stages of Growth and its Relation to Yield

1991 ◽  
Vol 20 (3) ◽  
pp. 571-575 ◽  
Author(s):  
Joseph E. Miller ◽  
Walter A. Pursley ◽  
Steven F. Vozzo ◽  
Allen S. Heagle
Keyword(s):  
Exchange Rate ◽  
Carbon Exchange ◽  
Stages Of Growth ◽  
Net Carbon Exchange

Relationships Between Apparent Nitrogen Fixation and Carbon Exchange Rate in Alfalfa 1

Crop Science ◽  
1980 ◽  
Vol 20 (4) ◽  
pp. 491-495 ◽  
Author(s):  
J. E. Sheehy ◽  
K. A. Fishbeck ◽  
D. A. Phillips
Keyword(s):  
Nitrogen Fixation ◽  
Exchange Rate ◽  
Carbon Exchange

scholarly journals Seasonal Net Carbon Exchange in Rotation Crops in the Temperate Climate of Central Lithuania

2019 ◽  
Vol 11 (7) ◽  
pp. 1966 ◽  
Author(s):  
Ligita Baležentienė ◽  
Ovidijus Mikša ◽  
Tomas Baležentis ◽  
Dalia Streimikiene
Keyword(s):  
Climate Change ◽  
Exchange Rate ◽  
Soil Respiration ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Co2 Emissions ◽  
Vegetation Period ◽  
Temperate Climate ◽  
Carbon Exchange ◽  
Area Index

Intelligent agricultural solutions require data on the environmental impacts of agriculture. In order for operationalize decision-making for sustainable agriculture, one needs to establish the corresponding datasets and protocols. Increasing anthropogenic CO2 emissions into the atmosphere force the choice of growing crops aimed at mitigating climate change. For this reason, investigations of seasonal carbon exchange were carried out in 2013–2016 at the Training Farm of the Vytautas Magnus University (former Aleksandras Stulginskis University), Lithuania. This paper compares the carbon exchange rate for different crops, viz., maize, ley, winter wheat, spring rapeseed and barley under conventional farming. This study focuses on the carbon exchange rate. We measure the emitted and absorbed CO2 fluxes by applying the closed chamber method. The biomass measurement and leaf area index (LAI) calculations at different plant growth stages are used to evaluate carbon exchange in different agroecosystems. The differences in photosynthetically assimilated CO2 rates were significantly impacted by the leaf area index (p = 0.04) during the plant vegetation period. The significantly (p = 0.02–0.05) strong correlation (r = 0.6–0.7) exists between soil respiration and LAI. Soil respiration composed only 21% of the agroecosystem carbon exchange. Plant respiration ranged between 0.034 and 3.613 µmol m−2 s−1 during the vegetation period composed of a negligible ratio (mean 16%) of carbon exchange. Generally, respiration emissions were obviously recovered by the gross primary production (GPP) of crops. Therefore, the ecosystems were acting as an atmospheric CO2 sink. Barley accumulated the lowest mean GPP 12.77 µmol m−2 s−1. The highest mean GPP was determined for ley (14.28 µmol m−2 s−1) and maize (15.68 µmol m−2 s−1) due to the biggest LAI and particular bio-characteristics. Due to the highest NEP, the ley (12.66 µmol m−2 s−1) and maize (12.76 µmol m−2 s−1) agroecosystems sank the highest C from the atmosphere and, thus, they might be considered the most sustainable items between crops. Consequently, the appropriate choice of crops and their area in crop rotations may reduce CO2 emissions and their impact on the environment and climate change.

Carbon allocation and translocation in chlorsulfuron-treated canola (Brassica napus)

Weed Science ◽  
1997 ◽  
Vol 45 (4) ◽  
pp. 466-469 ◽  
Author(s):  
Songmun Kim ◽  
William H. Vanden Born
Keyword(s):  
Brassica Napus ◽  
Carbon Fixation ◽  
No Reduction ◽  
Carbon Allocation ◽  
Starch Content ◽  
Carbon Exchange ◽  
Net Carbon Exchange

Our objective was to determine if the chlorsulfuron-induced reduction in assimilate export from leaves can be attributed to a shortage of carbohydrates. Treated canola leaves showed no reduction in carbon fixation or carbohydrate production during the first 24 h, but they exuded only 17 to 27% of the amount of sucrose exuded by corresponding control leaves. Exposure of the leaves to higher concentrations of CO2(500 vs. 350 μl L−1) resulted in greater net carbon exchange and higher starch content, but failed to overcome the reduction in sucrose export, presumably because of increased carbon allocation to starch.

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