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פותח על ידי קלירמאש פתרונות בע"מ -
Continuous droughts' effect on herbaceous vegetation cover and productivity in rangelands: results from close-range photography and spatial analysis
Year:
2013
Authors :
פרבולוצקי, אבי
;
.
Volume :
34
Co-Authors:
Shafran-Nathan, R., Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
Svoray, T., Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
Perevolotsky, A., Department of Agronomy and Natural Resources, The VolcaniCenter, Bet Dagan, 50250, Israel
Facilitators :
From page:
6263
To page:
6281
(
Total pages:
19
)
Abstract:
The function and structure of annual vegetation communities in rangeland ecosystems are the first to respond to extreme events such as drought. Changes in productive patch distribution patterns are a common indicator for ecosystem changes. Rarely, however, do realistic studies observe the effect of drought on patch distribution patterns in very high space-time resolution with remotely sensed data. We investigated the dynamics of herbaceous vegetation productive patches in a semiarid rangeland. The persistence of herbaceous vegetation productive patches during a period of drought was studied from two data sources: plant cover obtained from high-resolution vertical photography and productivity from biomass field estimates. This was done between two consecutive drought years (2007-2008 with 200 mm; 2008-2009 with 135 mm; annual average ∼300 mm) and along a topographic gradient. The results show that ongoing droughts led to spatial convergence of the productive patch size. Yet, productive and less productive patches persisted while plant cover decreased with rainfall reduction. We conclude that the response of herbaceous rangeland ecosystems to ongoing drought is mainly characterized by changes in the productive patch size and distribution. Moreover, these ecosystems are more resilient than expected, and their productivity might undergo drastic changes and yet maintain productivity under more severe drought scenarios than those currently predicted in the climate change literature. © 2013 Copyright Taylor and Francis Group, LLC.
Note:
Related Files :
climate change
drought
ecosystems
Photography
remote sensing
Semi-arid rangeland
spatial analysis
Vegetation community
עוד תגיות
תוכן קשור
More details
DOI :
10.1080/01431161.2013.793864
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26008
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:19
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Scientific Publication
Continuous droughts' effect on herbaceous vegetation cover and productivity in rangelands: results from close-range photography and spatial analysis
34
Shafran-Nathan, R., Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
Svoray, T., Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
Perevolotsky, A., Department of Agronomy and Natural Resources, The VolcaniCenter, Bet Dagan, 50250, Israel
Continuous droughts' effect on herbaceous vegetation cover and productivity in rangelands: results from close-range photography and spatial analysis
The function and structure of annual vegetation communities in rangeland ecosystems are the first to respond to extreme events such as drought. Changes in productive patch distribution patterns are a common indicator for ecosystem changes. Rarely, however, do realistic studies observe the effect of drought on patch distribution patterns in very high space-time resolution with remotely sensed data. We investigated the dynamics of herbaceous vegetation productive patches in a semiarid rangeland. The persistence of herbaceous vegetation productive patches during a period of drought was studied from two data sources: plant cover obtained from high-resolution vertical photography and productivity from biomass field estimates. This was done between two consecutive drought years (2007-2008 with 200 mm; 2008-2009 with 135 mm; annual average ∼300 mm) and along a topographic gradient. The results show that ongoing droughts led to spatial convergence of the productive patch size. Yet, productive and less productive patches persisted while plant cover decreased with rainfall reduction. We conclude that the response of herbaceous rangeland ecosystems to ongoing drought is mainly characterized by changes in the productive patch size and distribution. Moreover, these ecosystems are more resilient than expected, and their productivity might undergo drastic changes and yet maintain productivity under more severe drought scenarios than those currently predicted in the climate change literature. © 2013 Copyright Taylor and Francis Group, LLC.
Scientific Publication
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