Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0341-8162 |
EISSN | 1872-6887 |
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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