Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.3732/ajb.89.12.1933 |
Root deployment and shoot growth for two desert species in response to soil rockiness | |
Martre, P; North, GB; Bobich, EG; Nobel, PS | |
通讯作者 | Nobel, PS |
来源期刊 | AMERICAN JOURNAL OF BOTANY
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ISSN | 0002-9122 |
出版年 | 2002 |
卷号 | 89期号:12页码:1933-1939 |
英文摘要 | Soil texture, as well as the presence of rocks, can determine the water status, growth, and distribution of plants in and environments. The effects of soil rockiness and soil particle size distribution on shoot and root growth, root system size, rooting depth, and water relations were therefore investigated for the Crassulacean acid metabolism leaf succulent Agave deserti and the C-4 bunchgrass Pleuraphis rigida after precipitation events during the summer and winter/spring rainfall periods in the northwestern Sonoran Desert. The soils at the field site varied from sandy (<3% rocks by volume) to rocky (up to 35% rocks), with greater water availability at higher water potentials for sandy than for rocky soils. Although A. deserti was absent from the sandiest sites, its shoot and root growth during both rainfall periods were greatest in comparatively sandier sites and decreased as the soil rock content increased. Furthermore, A. deserti had twofold greater root surface area, root : leaf area ratio, and mean rooting depth at sandier than at rocky sites. As for A. deserti, shoot growth was greater for P. rigida at the sandier sites than at the rockier sites, even though its root surface area and mean rooting depth did not vary significantly. After early spring rainfall events, the leaf water potential for A. deserti did not differ between rocky and sandy sites, but transpiration rates were almost twofold greater at rocky than at sandy sites. During the same period, P. rigida had lower leaf water potentials and 25% lower transpiration rates at rocky than at sandy sites. The greater variability in the deployment of the root systems of A. deserti in response to soil rockiness may reflect its evergreen habit and slower growth, which allow it to endure periods of lower water availability than does P. rigida, whose leaves die during drought. |
英文关键词 | Agave deserti drought Pleuraphis rigida rocks root plasticity rooting depth Sonoran Desert |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000183132500008 |
WOS关键词 | WATER-HOLDING CHARACTERISTICS ; NORTHWESTERN SONORAN DESERT ; FOREST ECOSYSTEMS ; ROCK FRAGMENTS ; PATTERNS ; SUCCULENTS |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
来源机构 | University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/141998 |
作者单位 | (1)Univ Calif Los Angeles, Dept Ecol Evolut & Organismal Biol, Los Angeles, CA 90095 USA;(2)Occidental Coll, Dept Biol, Los Angeles, CA 90041 USA |
推荐引用方式 GB/T 7714 | Martre, P,North, GB,Bobich, EG,et al. Root deployment and shoot growth for two desert species in response to soil rockiness[J]. University of California, Los Angeles,2002,89(12):1933-1939. |
APA | Martre, P,North, GB,Bobich, EG,&Nobel, PS.(2002).Root deployment and shoot growth for two desert species in response to soil rockiness.AMERICAN JOURNAL OF BOTANY,89(12),1933-1939. |
MLA | Martre, P,et al."Root deployment and shoot growth for two desert species in response to soil rockiness".AMERICAN JOURNAL OF BOTANY 89.12(2002):1933-1939. |
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