Plant communities in harsh sites are less invaded: a summary of observations and proposed explanations

被引：76

作者：

Zefferman, Emily ^{[1
]}

Stevens, Jens T. ^{[1
,2
]}

Charles, Grace K. ^{[1
]}

Dunbar-Irwin, Mila ^{[1
]}

Emam, Taraneh ^{[1
]}

Fick, Stephen ^{[1
]}

Morales, Laura V. ^{[1
]}

Wolf, Kristina M. ^{[1
]}

Young, Derek J. N. ^{[1
]}

Young, Truman P. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA

[2] Univ Calif Davis, John Muir Inst Environm, Davis, CA 95616 USA

来源：

AOB PLANTS | 2015年 / 7卷

基金：

美国国家科学基金会;

关键词：

Environmental stress; invasibility; invasive/exotic plants; native plant refuges; propagule pressure; resource availability; MIXED-GRASS PRAIRIE; BROMUS-TECTORUM L; RESOURCE AVAILABILITY; INVASIVE PLANTS; ALTITUDINAL DISTRIBUTION; MYRIOPHYLLUM-SPICATUM; SPECIES COMPOSITION; PROPAGULE PRESSURE; BIOTIC RESISTANCE; SOIL-NITROGEN;

D O I：

10.1093/aobpla/plv056

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Plant communities in abiotically stressful, or 'harsh', habitats have been reported to be less invaded by non-native species than those in more moderate habitats. Here, we synthesize descriptive and experimental evidence for low levels of invasion in habitats characterized by a variety of environmental stressors: low nitrogen; low phosphorus; saline, sodic or alkaline soils; serpentine soils; low soil moisture; shallow/rocky soils; temporary inundation; high shade; high elevation; and high latitude. We then discuss major categories of hypotheses to explain this pattern: the propagule limitation mechanism suggests invasion of harsh sites is limited by relatively low arrival rates of propagules compared with more moderate habitats, while invasion resistance mechanisms suggest that harsh habitats are inherently less invasible due to stressful abiotic conditions and/or increased effects of biotic resistance from resident organisms. Both propagule limitation and invasion resistance may simultaneously contribute to low invadedness of harsh sites, but the management implications of these mechanisms differ. If propagule limitation is more important, managers should focus on reducing the likelihood of propagule introductions. If invasion resistance mechanisms are in play, managers should focus on restoring or maintaining harsh conditions at a site to reduce invasibility.

引用

页数：21