Arid
DOI10.1890/02-0635
Positive, negative, and net effects in grass-shrub interactions in mediterranean semiarid grasslands
Maestre, FT; Bautista, S; Cortina, J
通讯作者Maestre, FT
来源期刊ECOLOGY
ISSN0012-9658
出版年2003
卷号84期号:12页码:3186-3197
英文摘要

Current theoretical models and field evidence suggest that facilitation and interference act simultaneously in the field, but there is little information on their joint dynamics under varying abiotic conditions. We evaluated spatial and temporal variations in the positive, negative, and net effects of the tussock grass Stipa tenacissima on the shrub Pistacia lentiscus in Mediterranean semiarid grasslands. We performed a field experiment in which positive (microclimatic amelioration and water inputs from runoff). and negative (belowground competition) effects were experimentally manipulated under contrasting levels of stress. The environment provided by S. tenacissima (tussock treatment) improved the survival and physiological status of planted P. lentiscus seedlings. The elimination of shade and competition from S. tenacissima significantly decreased and increased, respectively, seedling performance as compared to the tussock treatment. We found evidence that microclimatic amelioration is the main positive factor involved in the interaction under study, and that it can balance the negative effects of belowground competition. The latter was also important, especially after major rainfall events. In contrast with previous studies, both the water inputs from runoff and the soil chemical fertility were found to have a relatively weak effect in the interaction under study. The net effect of S. tenacissima on P. lentiscus was always facilitative, but the magnitude of this effect increased with the harshness of the environmental conditions in both space and time. Despite this, the mechanisms underlying plant-plant interaction responded unequally to small-scale environmental variation. Our results agree with models suggesting that the magnitude of facilitation may increase under stressful conditions, and provide evidence of the dynamic nature of positive and negative interactions in the field.


英文关键词competition facilitation Mediterranean grassland Pistacia lentiscus plant species interactions positive and negative effects semiarid grassland Stipa tenacissima
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000187973500009
WOS关键词RELATIVE IMPORTANCE ; LEGUMINOUS SHRUB ; SEEDLING GROWTH ; MOJAVE DESERT ; MARSH PLANTS ; FACILITATION ; COMPETITION ; SOIL ; INTERFERENCE ; CANOPY
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/144480
作者单位(1)Univ Alicante, Dept Ecol, E-03080 Alicante, Spain;(2)Ctr Estudios Ambientales Mediterraneo, Paterna 46980, Spain
推荐引用方式
GB/T 7714
Maestre, FT,Bautista, S,Cortina, J. Positive, negative, and net effects in grass-shrub interactions in mediterranean semiarid grasslands[J],2003,84(12):3186-3197.
APA Maestre, FT,Bautista, S,&Cortina, J.(2003).Positive, negative, and net effects in grass-shrub interactions in mediterranean semiarid grasslands.ECOLOGY,84(12),3186-3197.
MLA Maestre, FT,et al."Positive, negative, and net effects in grass-shrub interactions in mediterranean semiarid grasslands".ECOLOGY 84.12(2003):3186-3197.
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