Patterns of diversity in plant and soil microbial communities along a productivity gradient in a Michigan old-field
Patterns of diversity in plant and soil microbial communities along a productivity gradient in a Michigan old-field
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DOI：
10.1007/s004420000456
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发表时间：
2000-11-01
期刊：
影响因子：
2.7
通讯作者：
Gross, KL
中科院分区：
文献类型：
--
作者：
Broughton, LC;Gross, KL
植物多样性与生产力之间的关系在生态学中受到广泛关注，但这些因素与土壤微生物群落的关系却很少有人探讨。支持土壤微生物群落的碳资源主要来自植物，因此土壤微生物群落可能会对植物多样性或生产力的变化做出反应，特别是如果植物群落影响可用碳的质量或数量。我们调查了植物多样性和生产力的土壤微生物群落组成的关系沿着地形梯度在密歇根州西南部的中期演替的老领域。土壤水分，土壤无机氮，植物生物量增加，从顶部到底部的斜坡，而在地面上的光下降沿着这同一梯度。我们的特点是资源水平的变化沿着这一梯度使用的生产力指数，结合光照水平，土壤氮，土壤水分和植物生物量。平均植物物种丰富度随着该生产力指数而下降，并且植物群落沿着梯度存在相关的组成变化。植物群落从主要是低生长的多年生杂类草在低生产力的多年生牧草在较高的生产力。虽然有变化的土壤微生物群落的结构[所示的脂肪酸甲酯（FAME）配置文件]，在土壤微生物群落的组成的变化与植物生产力或多样性不相关。然而，微生物活性表明Biolog平均良好的颜色发展和基质诱导呼吸（SIR）I与植物生产力呈正相关。植物生物量和土壤微生物活性模式之间的相似性表明，要么是植物生产力驱动微生物生产力，要么是这两个社区的资源限制共同变化。
The relationship between plant diversity and productivity has received much attention in ecology, but the relationship of these factors to soil microbial communities has been little explored. The carbon resources that support soil microbial communities are primarily derived from plants, so it is likely that the soil microbial community should respond to changes in plant diversity or productivity, particularly if the plant community affects the quality or quantity of available carbon. We investigated the relationship of plant diversity and productivity to the composition of the soil microbial community along a topographic gradient in a mid-successional old-field in southwestern Michigan. Soil moisture, soil inorganic N, and plant biomass increased from the top to the base of the slope, while light at ground level decreased along this same gradient. We characterized the changes in resource levels along this gradient using an index of productivity that incorporated light levels, soil N, soil moisture, and plant biomass. Average plant species richness declined with this productivity index and there were associated compositional changes in the plant community along the gradient. The plant community shifted from predominantly low-growing perennial forbs at low productivities to perennial grasses at higher productivities. Although there was variation in the structure of the soil microbial community [as indicated by fatty acid methyl ester (FAME) profiles], changes in the composition of the soil microbial community were not correlated with plant productivity or diversity. However, microbial activity was indicated by Biolog average well color development and substrate-induced respiration (SIR)I was positively correlated with plant productivity. The similarity between patterns of plant biomass and soil microbial activity suggests that either plant productivity is driving microbial productivity or that limiting resources for each of these two communities co-vary.