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פותח על ידי קלירמאש פתרונות בע"מ -
Variability of soil aggregation in a hilly semi-arid rangeland
Year:
2010
Source of publication :
Journal of Arid Environments
Authors :
אונגר, יוג'ין דוד
;
.
Volume :
74
Co-Authors:
Stavi, I., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Ungar, E.D., Department of Agronomy and Natural Resources, Institute of Plant Sciences, Agricultural Research Organization, Bet Dagan, 50250, Israel
Lavee, H., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Sarah, P., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Facilitators :
From page:
946
To page:
953
(
Total pages:
8
)
Abstract:
Aggregation is an important process related to structure of the soil. This study examined soil aggregation indices in a semi-arid rangeland in the northern Negev region of Israel. The purpose of the study was to investigate to what extent the soil aggregation is affected by hillside aspect, surface cover and grazing. The soil of four types of surface cover - shrub patch, intershrub area, flock trampling route and rock fragment cluster - was sampled in an area subject to grazing and in grazing exclusion plots. At the peak of the growing season and at the end of the dry season, sampling was conducted from two depths (0-2 and 5-10 cm) on a north- and south-facing hillside. We determined the aggregation indices of <250 μm, >2000 μm, >8000 μm and the mean weight diameter. Differences were found between hillside aspects as well as among the types of cover. Grazing affected the fraction >8000 μm. The aggregation indices of the trampling routes were distinct from those of the intershrub area. It is proposed that in semi-arid rangelands, uneven grazing pressure in the intershrub area creates spatial heterogeneity in soil aggregation properties, which affect the spatial redistribution of soil resources and primary production. © 2010 Elsevier Ltd. All rights reserved.
Note:
Related Files :
Grazing
grazing pressure
hill
Israel
Macro-aggregation
Negev
trampling routes
vegetation cover
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.jaridenv.2009.12.003
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23581
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:00
Scientific Publication
Variability of soil aggregation in a hilly semi-arid rangeland
74
Stavi, I., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Ungar, E.D., Department of Agronomy and Natural Resources, Institute of Plant Sciences, Agricultural Research Organization, Bet Dagan, 50250, Israel
Lavee, H., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Sarah, P., Laboratory of Soil and Geomorphology, Department of Geography and Environment, Bar-Ilan University, Ramat Gan, 52900, Israel
Variability of soil aggregation in a hilly semi-arid rangeland
Aggregation is an important process related to structure of the soil. This study examined soil aggregation indices in a semi-arid rangeland in the northern Negev region of Israel. The purpose of the study was to investigate to what extent the soil aggregation is affected by hillside aspect, surface cover and grazing. The soil of four types of surface cover - shrub patch, intershrub area, flock trampling route and rock fragment cluster - was sampled in an area subject to grazing and in grazing exclusion plots. At the peak of the growing season and at the end of the dry season, sampling was conducted from two depths (0-2 and 5-10 cm) on a north- and south-facing hillside. We determined the aggregation indices of <250 μm, >2000 μm, >8000 μm and the mean weight diameter. Differences were found between hillside aspects as well as among the types of cover. Grazing affected the fraction >8000 μm. The aggregation indices of the trampling routes were distinct from those of the intershrub area. It is proposed that in semi-arid rangelands, uneven grazing pressure in the intershrub area creates spatial heterogeneity in soil aggregation properties, which affect the spatial redistribution of soil resources and primary production. © 2010 Elsevier Ltd. All rights reserved.
Scientific Publication
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