Plant Area Index and microclimate underneath shrub species from a Chilean semiarid community

被引:26
作者
Tracol, Y. [1 ,4 ]
Gutierrez, J. R. [1 ,2 ,3 ]
Squeo, F. A. [1 ,2 ,3 ]
机构
[1] Ctr Adv Studies Arid Zones CEAZA, La Serena, Chile
[2] Univ La Serena, Fac Ciencias, Dept Biol, La Serena, Chile
[3] IEB, Santiago, Chile
[4] Ctr Rech Ecosyst Altitude, Chamonix Mont Blanc, France
基金
美国国家科学基金会;
关键词
Desertification; Native species; Nurse effect; POSITIVE INTERACTIONS; VEGETATION INDEXES; NURSE PLANTS; FACILITATION; CANOPY; MODEL; ENVIRONMENTS; SENSITIVITY; PERFORMANCE; COMPETITION;
D O I
10.1016/j.jaridenv.2010.08.002
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In drylands, environmental conditions under shrub canopy differ from those found in open sites. We should expect that microclimate conditions under shrubs with distinct canopy architecture should also be different. Plant Area Index (PAI) of the three most abundant shrubs species (Porlieria chilensis, Adesmia bedwellii and Proustia cuneifolia) in Bosque Fray Jorge National Park, north-central Chile was measured using a Plant Canopy Analyzer. During two years (2004-2005), we recorded the Relative Humidity and Air Temperature underneath and away from the canopy of the shrubs. The three shrub species showed significant differences in PAI. Microclimate at 30 cm and 2 m above the soil in the open conditions were drier and warmer than underneath shrub canopies. Vegetation patches generate moderate microclimate conditions. Canopy structure can buffer climatic variability, contributing to high herbaceous productivity as well as shrub recruitment. Reflecting shrub architecture and observed PAI values, the lowest microclimate variations were observed under the canopies of P. chilensis, followed by P. cuneifolia and finally A. bedwellii. We bring a novel approach quantifying the Plant Area Index instead of the Plant cover and using a low cost method that integrates the distribution of leaves and may be derived from remote sensing products. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1 / 6
页数:6
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