ROADLESS HABITATS AS REFUGES FOR NATIVE GRASSLANDS: INTERACTIONS WITH SOIL, ASPECT, AND GRAZING
作者： Jonathan L. Gelbard , Susan Harrison
DOI: 10.1890/1051-0761(2003)013[0404:RHARFN]2.0.CO;2
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摘要: The idea that roadless habitats act as refuges for native-plant diversity against exotic-plant invasion has seldom been tested. We examined the effect of distance from roads and its interactions with soil type, aspect, livestock grazing on native- in a 130 000-ha inland California (USA) foothill grassland landscape. During spring 2000 2001, we measured numbers cover by native exotic plant species 92 sites stratified (10 m, 100 >1000 m), type (nonserpentine serpentine), aspect (cool, warm, neutral slopes). In nonserpentine grasslands, was greatest m (23%) least 10 (9%), percentage were significantly (44%) those (32%). addition, most distant had largest number grass fewest forb species. serpent...
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