Arid
DOI10.1016/j.catena.2013.10.006
Latitude, basin size, and microhabitat effects on the viability of Acacia trees in the Negev and Arava, Israel
Stavi, I.1; Silver, M.2; Avni, Y.3
通讯作者Stavi, I.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2014
卷号114页码:149-156
英文摘要

In the hyper-arid Arava Valley and eastern Negev desert of Israel, the acacia species of raddiana, tortilis, and pachyceras play a central role as keystone species. Many studies implemented during the last few decades have revealed considerable changes in acacia populations, including high mortality rates and low recruitment. The objective of this study aimed to examine the relationships between presumed water availability for acacia populations and their mortality by examining the effect on tree mortality of latitude, basin size, and microhabitat in the valley floor. A total of 1980 acacia trees in 11 wadis along the Arava and eastern Negev region were studied. The obtained results revealed a highly varied inter-wadi mortality rate, ranging between 6.7% and 72.2%. Overall, mortality within species occurred in 14.7% of Acacia pachyceras, 16.8% of Acacia tortilis, and 29.4% of Acacia raddiana. A highly negative correlation coefficient (r = -0.55; P < 0.0001) was found between latitude and acacia mortality. However, a low and not statistically significant correlation coefficient was found between basin size and acacia mortality (r = 024; P = 0.2103). In terms of overall occurrence in microhabitat across the valley floor, 6.4% of the trees were located in main channels, 9.8% in high banks, 10.4% in bars, 19.1% in secondary channels, and 54.3% in low banks. However, the effect of microhabitat on acacia mortality rates was not statistically significant (P = 0.2240). In addition to these, we monitored the occurrence of the hemiparasite, mistletoe (Plicosepalus acaciae), which was observed in 82% of the trees. Also, the tree canopies’ height and diameter were measured in order to calculate a size index for them. Values of this index were divided into four groups in order to represent the size distribution of trees. The overall occurrence of 3.6% of the smallest tree-size group is worrisome, as it presumably indicates very low recruitment rates. (C) 2013 Elsevier B.V. All rights reserved.


英文关键词Climatic change Flood events Geological and hydrological background Long-term precipitation regimes Rainfall events Water stress
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000331346300015
WOS关键词DESERT ; POPULATIONS ; RECRUITMENT ; MORTALITY
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181281
作者单位1.Dead Sea & Arava Sci Ctr, IL-88840 Ketura, Israel;
2.Arava Drainage Author, IL-86825 Sapir, Israel;
3.Geol Survey Israel, IL-95501 Jerusalem, Israel
推荐引用方式
GB/T 7714
Stavi, I.,Silver, M.,Avni, Y.. Latitude, basin size, and microhabitat effects on the viability of Acacia trees in the Negev and Arava, Israel[J],2014,114:149-156.
APA Stavi, I.,Silver, M.,&Avni, Y..(2014).Latitude, basin size, and microhabitat effects on the viability of Acacia trees in the Negev and Arava, Israel.CATENA,114,149-156.
MLA Stavi, I.,et al."Latitude, basin size, and microhabitat effects on the viability of Acacia trees in the Negev and Arava, Israel".CATENA 114(2014):149-156.
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