Effects of a long-term field sulfur dioxide fumigation on Arctic caribou forage lichens

1980 ◽  
Vol 58 (21) ◽  
pp. 2235-2240 ◽  
Author(s):  
Thomas J. Moser ◽  
Thomas H. Nash III ◽  
W. Dennis Clark
Keyword(s):  
Sulfur Dioxide ◽  
Stress Gradient ◽  
Growing Season ◽  
Photosynthetic Response ◽  
Test Species ◽  
Chlorophyll Contents ◽  
Cladonia Rangiferina ◽  
Term Field

The gross photosynthetic response of Cladonia stellaris (Opiz.) Pouz. & Vezda., Cladonia rangiferina (L.) Wigg., and Cetraria cucullata (Bell.) Ach. to a continuous, long-term, in situ SO2 fumigation was monitored during the growing season at Anaktuvuk Pass, Alaska. The photo-synthetic capabilities of the test species were either destroyed or significantly reduced depending upon the SO2 stress gradient over the fumigation plot. Additional sampling of the plot 1 year after termination of the fumigation revealed no significant recovery in photosynthesis, and chlorophyll contents of the test species were significantly less than the controls.

Photosynthetic recovery in arctic caribou forage lichens following a long-term field sulfur dioxide fumigation

1983 ◽  
Vol 61 (1) ◽  
pp. 367-370 ◽  
Author(s):  
Thomas J. Moser ◽  
Thomas H. Nash III ◽  
Astrid G. Olafsen
Keyword(s):  
Photosynthetic Response ◽  
Test Species ◽  
Growing Seasons ◽  
Photosynthetic Recovery ◽  
Sublethal Concentrations ◽  
Cladonia Rangiferina ◽  
Photosynthetic Capacities ◽  
Term Field

The gross photosynthetic response of Cladonia stellaris (Opiz.) Pouz. & Vezda., Cladonia rangiferina (L.) Wigg., and Cetraria cucullata (Bell.) Ach. was monitored during three growing seasons subsequent to a long-term, in situ SO2 fumigation conducted in 1978 at Anaktuvuk Pass, AK. The lichen vegetation which had experienced the greatest SO2 stress during the 1978 fumigation remained photosynthetically inactive. Significant photosynthetic recovery was discovered in the test species which had experienced sublethal concentrations of SO2; however, their photosynthetic capacities remained less than controls.

Diurnal gross photosynthetic patterns and potential seasonal CO2 assimilation in Cladonia stellaris and Cladonia rangiferina

1983 ◽  
Vol 61 (3) ◽  
pp. 642-655 ◽  
Author(s):  
Thomas J. Moser ◽  
Thomas H. Nash III ◽  
Steven O. Link
Keyword(s):  
Photosynthetic Activity ◽  
Growing Season ◽  
Early Morning ◽  
Co2 Assimilation ◽  
Atmospheric Moisture ◽  
Growing Seasons ◽  
Late Evening ◽  
Summer Rain ◽  
Cladonia Rangiferina

The daily, in situ gross photosynthetic patterns of Cladonia stellaris (Opiz.) Pouz. & Vězda. and Cladonia rangiferina (L.) Wigg. were monitored during portions of the 1977, 1978, and 1979 growing seasons at Anaktuvuk Pass, Alaska. Photosynthetic activity in both species closely paralleled atmospheric moisture status, where peak photosynthetic rates were attained during or following sporadic summer rain. In addition, thallus absorption of moisture during extended periods of high atmospheric water vapor content gave rise to short periods of minimal photosynthetic activity. During late evening and early morning hours moistened thalli exhibited minimal or no photosynthetic activity, coinciding with consistent attenuation in solar radiation during these periods. Photosynthetic activity was not homogeneous throughout the thallus. The greatest activity occurred in the apical regions and decreased progressively into the basal regions. The apical 10-mm regions of C. stellaris and C. rangiferina thalli accounted for approximately 50% of their photosynthetic capabilities. The potential gross CO2 assimilation of the apical 10-mm regions over 72 days of the 1978 growing season was estimated at approximately 35 g CO2∙m−2 and 16 g CO2∙m−2 for C. stellaris and C. rangiferina, respectively.

Response and adaptation of soybean systems to climate warming in Northeast China: insights gained from long-term field trials

2011 ◽  
Vol 62 (10) ◽  
pp. 876 ◽  
Author(s):  
H. F. Zheng ◽  
L. D. Chen ◽  
X. Z. Han
Keyword(s):  
Global Warming ◽  
Climate Warming ◽  
Crop Yields ◽  
Cropping Systems ◽  
Soybean Seed ◽  
Growing Season ◽  
Yield Reduction ◽  
Seed Filling ◽  
Term Field

Developing and assessing successful strategies to alleviate adverse impact of climate warming presents a new opportunity for sustainable agriculture and adaptation investment. Efforts to anticipate adaptation of cropping systems may benefit from understanding the global warming effects within decades. This study quantitatively examines the temperature warming impacts during, respectively, growing season and seed filling on soybean yields by using data from long-term field fertilisation experiments from 1987 to 2004. Here we report that grain yields significantly decreased with rising temperature during growing season, whereas the effects of increasing temperature at seed-filling stage on crop yields were significantly positive. The results indicate that a further temperature increment during seed filling appears to decrease soybean system’s risk of yield reduction. Importantly, we inferred that earlier occurrence of seed filling would increase the temperature of this period. The implication is that advancing the onset of soybean seed filling could be an effective adaptation option to global warming, providing an average yield benefit of ~14% per 10 days before the present date.

scholarly journals Ecological controlling weed abundance in winter wheat crops

2020 ◽  
pp. 16-19
Author(s):  
Ya. Tsvei ◽  
R. Ivanina ◽  
Yu. Dubovyi
Keyword(s):  
Winter Wheat ◽  
Chenopodium Album ◽  
Growing Season ◽  
Research Data ◽  
Mineral Fertilizers ◽  
Effective Measure ◽  
Rotation Factor ◽  
Time Of Harvest ◽  
Term Field

Goal. To study the effectiveness of fertilizers and crop rotation factor in controlling weed abundance in winter wheat crops. Methods. Long-term field and analytical. Results. Research data on the effectiveness of fertilizers and legumes predecessors in controlling weed abundance in winter wheat crops are presented. It has been established that the basis of weeding of winter wheat crops in the spring tillage phase was one- and dicotyledonous species, at the time of harvest — mostly by mass dicotyledonous. In the composition of the weeds, the largest competition for winter wheat crops for light and nutrients was created by Chenopodium album — 3.4—4.3 g/m2, Capsella bursa-pastoris L. — 0.6—4.0, Spergula vulgaris — 0.3—2.9, Fallopia convolvulus — 1.0—1.1 g/ m2. The use of mineral fertilizers significantly reduced the number of weeds in winter wheat crops at the beginning of the growing season and their mass at the time of harvest. Legume predecessors had not significant effect on the dynamics of weed development in winter wheat agrocenosis. Conclusions. The application of mineral fertilizers has been identified as an effective measure todecreaseweeds abundance and their mass in winter wheat crops. At the fertilizer doses N60Р60К60 the number of weeds in the spring tillage phase decreased by 6.3—6.5 times as compared to the control without fertilizers, and the mass of weeds at the time of harvest — by 2.6—3.0 times. Under the clover predecessor, the mass of dicotyledonous weeds at the time of harvest compared to the spring vetch was slightly higher with the predominance of Capsella bursa-pastoris L. — 2.5 g/m2 and Chenopodium album — 2.3 g/m2. Increasing the nitrogen dose for winter wheat from 60 to 90 kg/ha only in the clover rotation chain slightly increased the weed mass at the time of harvest. The total weeds mass in comparison with the nitrogen dose of 60 kg/ha increased by 2.7 g/m2.

A Long-Term Field Study of In Situ Bioremediation in a Fractured Conglomerate Trichloroethene Source Zone

2015 ◽  
Vol 19 (1) ◽  
pp. 18-31 ◽  
Author(s):  
Matthew F. Verce ◽  
Victor M. Madrid ◽  
Steven D. Gregory ◽  
Zafer Demir ◽  
Michael J. Singleton ◽  
...  
Keyword(s):  
Field Study ◽  
Source Zone ◽  
In Situ Bioremediation ◽  
Term Field

Environmental variation in the long term pattern of germination from hard seeds of Lupinus varius

1967 ◽  
Vol 7 (26) ◽  
pp. 263 ◽  
Author(s):  
BJ Quinlivan
Keyword(s):  
Environmental Conditions ◽  
Growing Season ◽  
Environmental Variation ◽  
Hard Seeds ◽  
Field Germination ◽  
Site Variation ◽  
Dry Seasons ◽  
Marginal Environment ◽  
Term Field

The long-term field germination pattern from hard seeds of sandplain lupin varied between sites. At Perth, where environmental conditions are almost ideal for the species, the hard seeds formed at the end of a growing season soften and germinate over the following five years. Some 15-20 per cent softened each summer and germinated with the following autumn rains. At Chapman, some 300 miles north of Perth in a drier more marginal environment for the species, all the hard seeds softened and germinated within two years. This wide site variation in the spread of germination from hard seeds is ascribed to environmental differences during the growing and dry seasons.

Long-term photosynthetic response in single leaves of A C3 and C4 salt marsh species grown at elevated atmospheric CO2 in situ

Oecologia ◽  
1990 ◽  
Vol 83 (4) ◽  
pp. 469-472 ◽  
Author(s):  
Lewis H. Ziska ◽  
Bert G. Drake ◽  
Sarah Chamberlain
Keyword(s):  
Salt Marsh ◽  
Atmospheric Co2 ◽  
Photosynthetic Response ◽  
Elevated Atmospheric Co2 ◽  
Salt Marsh Species

DURUM WHEAT: RESULTS OF LONG-TERM FIELD RESEARCH ON THE DURUM WHEAT COLLECTION IN THE ENVIRONMENTS OF THE CASPIAN DEPRESSION

2018 ◽  
Author(s):  
O.A. Lyapunova ◽  
◽  
M.A. Akhmedov ◽  
A.S. Andreeva ◽  
M.M. Magomedov ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Field Research ◽  
Caspian Depression ◽  
Term Field

Long Term Field Test Results of Experimental EPDM and PUF Roofing

1990 ◽  
Author(s):  
David M. Bailey ◽  
Stuart D. Foltz ◽  
Myer J. Rosenfield
Keyword(s):  
Field Test ◽  
Test Results ◽  
Term Field
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