Effects of sulphur dioxide exposure on leaf mass per area of selected gymnosperms and implications for interpreting the plant fossil record

2021 ◽  
Author(s):  
Karen L Bacon ◽  
Matthew Haworth ◽  
Jennifer C McElwain
Keyword(s):  
Sulphur Dioxide ◽  
Fossil Record ◽  
Leaf Mass Per Area ◽  
Leaf Mass ◽  
Plant Fossil

Did Ground Cover Change Over Geologic Time?

2000 ◽  
Vol 6 ◽  
pp. 171-182 ◽  
Author(s):  
Ben A. LePage ◽  
Hermann W. Pfefferkorn
Keyword(s):  
Fossil Record ◽  
Ground Cover ◽  
The Other ◽  
Detailed Account ◽  
Geologic Time ◽  
The Past ◽  
Other Hand ◽  
Plant Fossil

When one hears the term “ground cover,” one immediately thinks of “grasses.” This perception is so deep-seated that paleobotanists even have been overheard to proclaim that “there was no ground cover before grasses.” Today grasses are so predominant in many environments that this perception is perpetuated easily. On the other hand, it is difficult to imagine the absence or lack of ground cover prior to the mid-Tertiary. We tested the hypothesis that different forms of ground cover existed in the past against examples from the Recent and the fossil record (Table 1). The Recent data were obtained from a large number of sources including those in the ecological, horticultural, and microbiological literature. Other data were derived from our knowledge of Precambrian life, sedimentology and paleosols, and the plant fossil record, especially in situ floras and fossil “monocultures.” Some of the data are original observations, but many others are from the literature. A detailed account of these results will be presented elsewhere (Pfefferkorn and LePage, in preparation).

Modeled physiological mechanisms for observed changes in the late Paleozoic plant fossil record

2021 ◽  
Vol 562 ◽  
pp. 110056
Author(s):  
Jon D. Richey ◽  
Isabel P. Montañez ◽  
Joseph D. White ◽  
William A. DiMichele ◽  
William J. Matthaeus ◽  
...  
Keyword(s):  
Fossil Record ◽  
Late Paleozoic ◽  
Physiological Mechanisms ◽  
Plant Fossil

scholarly journals The plant fossil record reflects just two great extinction events

Terra Nova ◽  
2013 ◽  
Vol 26 (3) ◽  
pp. 195-200 ◽  
Author(s):  
Borja Cascales-Miñana ◽  
Christopher J. Cleal
Keyword(s):  
Fossil Record ◽  
Plant Fossil ◽  
Extinction Events

Photosynthesis and physiological traits of evergreen broadleafed saplings during winter under different light environments in a temperate forest

2006 ◽  
Vol 84 (1) ◽  
pp. 60-69 ◽  
Author(s):  
Yoshiyuki Miyazawa ◽  
Kihachiro Kikuzawa
Keyword(s):  
Temperate Forest ◽  
Light Availability ◽  
Net Photosynthesis ◽  
Carbon Gain ◽  
Leaf Mass Per Area ◽  
Camellia Japonica ◽  
Leaf Mass ◽  
Unit Leaf ◽  
Canopy Trees ◽  
Photosynthetic Traits

Photosynthetic traits of the evergreen broadleafed species Camellia japonica L. and Quercus glauca Thunb. were continuously investigated during autumn and winter using saplings that grew in different light environments (gap, deciduous canopy understory, and evergreen canopy understory) in a temperate forest. Light-saturated rates of net photosynthesis in midwinter and spring were lower than those in autumn. Photosynthetic capacity, scaled to a common leaf temperature of 25 °C, increased or remained stable after autumn and then decreased in spring in most leaves. Photosynthetic traits per unit leaf area were different among leaves in different light environments of both Camellia and Quercus during most periods. However, photosynthetic traits per unit leaf mass did not differ among leaves in different light environments, suggesting that differences in photosynthetic traits were mainly due to different leaf mass per area among leaves. Photosynthetic rates under light availability typical in the environment were lower in winter than in autumn in leaves in the sun in a gap but were not different in leaves in the shade under evergreen canopy trees. Thus, the importance of winter carbon gain for annual carbon gain is small in leaves in a gap but is large in leaves under evergreen canopy trees.

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