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פותח על ידי קלירמאש פתרונות בע"מ -
Environmental factors affecting dispersal, germination and distribution of Stipa capensis in the Negev Desert, Israel
Year:
2004
Source of publication :
Ecological Research
Authors :
צעדי, אלי
;
.
Volume :
19
Co-Authors:
Boeken, B., U. Ecophysiology Introduction D., Wyler Dept. of Drylands Agriculture, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Ariza, C., Mitrani Department of Desert Ecology, Jacob Blaustein Inst. Desert Res., Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel, Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Gutterman, Y., U. Ecophysiology Introduction D., Wyler Dept. of Drylands Agriculture, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Zaady, E., Mitrani Department of Desert Ecology, Jacob Blaustein Inst. Desert Res., Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel, Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Facilitators :
From page:
533
To page:
540
(
Total pages:
8
)
Abstract:
The effects of postmaturation ambient temperatures, light, as well as chemical and structural properties of the substrate on germination and patch distribution of Stipa capensis in a shrubland landscape were studied. This species is a dominant annual grass in exposed intershrub areas covered with biological loess soil crusts in the northern Negev Desert. Freshly matured caryopses do not germinate. After 7-8 months of dry storage at high temperatures, there was a significant reduction in primary dormancy and an increase in the rate and percentage of germination of caryopses stored at high temperatures. The speed and percentages of germination were lower on various sterile substrates, such as organic matter and loose loess soil, in comparison with similar live substrates or the control on filter paper. In 3 of 4 years of field observations in semi-arid shrubland, the density of Stipa capensis plants on soil crust in the exposed intershrub areas was significantly higher than below shrubs. The positive effects of higher temperatures on the dry soil during summer, before the season with rains, and of light during germination, can favor germination in exposed patches. Although germination responses to storage temperature and light regime differentiate between patch types before and during germination, other processes may be critical for the pattern of distribution of Stipa capensis. These include dispersal of caryopses, arrival, soil penetration and density of local seed banks, as well as substrate properties affecting germination and plant density, in different landscape patches.
Note:
Related Files :
Dispersal
Dry storage temperatures
germination
Israel
Negev
Shrubland
Soil seed bank
עוד תגיות
תוכן קשור
More details
DOI :
10.1111/j.1440-1703.2004.00666.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
25908
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:18
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Scientific Publication
Environmental factors affecting dispersal, germination and distribution of Stipa capensis in the Negev Desert, Israel
19
Boeken, B., U. Ecophysiology Introduction D., Wyler Dept. of Drylands Agriculture, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Ariza, C., Mitrani Department of Desert Ecology, Jacob Blaustein Inst. Desert Res., Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel, Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Gutterman, Y., U. Ecophysiology Introduction D., Wyler Dept. of Drylands Agriculture, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Zaady, E., Mitrani Department of Desert Ecology, Jacob Blaustein Inst. Desert Res., Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel, Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, 84990, Israel
Environmental factors affecting dispersal, germination and distribution of Stipa capensis in the Negev Desert, Israel
The effects of postmaturation ambient temperatures, light, as well as chemical and structural properties of the substrate on germination and patch distribution of Stipa capensis in a shrubland landscape were studied. This species is a dominant annual grass in exposed intershrub areas covered with biological loess soil crusts in the northern Negev Desert. Freshly matured caryopses do not germinate. After 7-8 months of dry storage at high temperatures, there was a significant reduction in primary dormancy and an increase in the rate and percentage of germination of caryopses stored at high temperatures. The speed and percentages of germination were lower on various sterile substrates, such as organic matter and loose loess soil, in comparison with similar live substrates or the control on filter paper. In 3 of 4 years of field observations in semi-arid shrubland, the density of Stipa capensis plants on soil crust in the exposed intershrub areas was significantly higher than below shrubs. The positive effects of higher temperatures on the dry soil during summer, before the season with rains, and of light during germination, can favor germination in exposed patches. Although germination responses to storage temperature and light regime differentiate between patch types before and during germination, other processes may be critical for the pattern of distribution of Stipa capensis. These include dispersal of caryopses, arrival, soil penetration and density of local seed banks, as well as substrate properties affecting germination and plant density, in different landscape patches.
Scientific Publication
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