EFFECTS OF SOIL RESOURCES ON PLANT INVASION AND COMMUNITY STRUCTURE IN CALIFORNIAN SERPENTINE GRASSLAND
EFFECTS OF SOIL RESOURCES ON PLANT INVASION AND COMMUNITY STRUCTURE IN CALIFORNIAN SERPENTINE GRASSLAND
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DOI：
10.2307/1940302
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发表时间：
1990-04-01
期刊：
影响因子：
4.8
通讯作者：
VITOUSEK, PM
中科院分区：
文献类型：
--
作者：
HUENNEKE, LF;HAMBURG, SP;VITOUSEK, PM
非本地的一年生草占主导地位的大多数加州地中海气候草原今天。然而，本土加州草原植物群坚持在草原上蛇纹衍生的土壤。我们操纵土壤养分资源，探讨养分的可用性，植物生产力，以及本地和非本地物种的相对丰度在蛇形草地之间的联系。因子组合的氮，磷，和其他成分的营养完整的公式被添加到田间小区在两个生长季节。施肥与氮和磷的居民植被的生物量大幅增加，在第一个赛季，并在两年内允许入侵和主导地位的非本地的一年生草本植物的补丁原来占主导地位的本地一年生杂类草。物种丰富度下降，施肥，入侵者的生物量生产的增加抑制了一些本地杂类草。增加常量营养素的可用性可以增加蛇纹岩衍生土壤的产量，即使其他蛇纹岩特性（如低钙镁比和高重金属浓度）没有得到缓解。观察到的群落结构和组成的变化表明，植物群落的入侵性可能直接受到养分供应，独立的物理干扰。
Non-native annual grasses dominate most California mediterranean-climate grasslands today. However, native California grassland flora persists in grasslands on serpentine-derived soils. We manipulated soil nutrient resources to explore the links between nutrient availability, plant productivity, and the relative abundances of native and non-native species in serpentine grassland. Factorial combinations of nitrogen, phosphorus, and other components of a nutritionally complete formula were added to field plots over two growing seasons. Fertilization with nitrogen and phosphorus increased biomass of the resident vegetation substantially in the first season, and within two years allowed the invasion and dominance of non-native annual grasses in patches originally dominated by native annual forbs. Species richness declined with fertilization, as the increased biomass production by invaders suppressed some native forbs. Increased macronutrient availability can increase production on serpentine-derived soil, even when other serpentine characteristics (such as low Ca/Mg ratios and high heavy-metal concentrations) have not been mitigated. Observed changes in community structure and composition demonstrate that the invasibility of plant communities may be directly influenced by nutrient availability, independent of physical disturbance.