The influence of tropical plant diversity and composition on soil microbial communities
The influence of tropical plant diversity and composition on soil microbial communities
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DOI：
10.1007/s00248-006-9115-z
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发表时间：
2006-08-01
影响因子：
3.6
通讯作者：
Matson, Pamela A.
中科院分区：
文献类型：
--
作者：
Carney, Karen M.;Matson, Pamela A.
人们越来越有兴趣了解地上和地下群落之间的联系，但人们对热带系统中的这些联系知之甚少。我们利用哥斯达黎加拉塞尔瓦生物站的一个实验场地，研究了植物多样性、植物群落组成和季节是否影响微生物群落。我们还确定了土壤特征是否与微生物群落的差异有关。磷脂脂肪酸 (PLFA) 组成显示，微生物群落组成在植物多样性梯度上存在差异（地块包含 1、3、5 或超过 25 个物种）。植物物种特性也是影响微生物群落组成的一个因素； PLFA 组成在单一栽培之间以及植物物种组成不同的三物种组合之间存在显着差异。在该研究的所有四个采样日期中，每次比较中的治疗方法之间的差异都很明显。尽管我们确实看到随着时间的推移发生了显着的变化，但湿季和干季之间的微生物群落组成没有一致的变化。在所有测量的土壤特征中，土壤 C/N 最常与处理组中微生物群落组成的变化相关。我们的研究结果为人类通过改变植物群落组成和多样性来改变土壤微生物群落提供了证据，并且这种变化部分是由土壤碳质量的变化介导的。
There is growing interest in understanding the linkages between above- and belowground communities, and very little is known about these linkages in tropical systems. Using an experimental site at La Selva Biological Station, Costa Rica, we examined whether plant diversity, plant community composition, and season influenced microbial communities. We also determined whether soil characteristics were related to differences in microbial communities. Phospholipid fatty acid (PLFA) composition revealed that microbial community composition differed across a plant diversity gradient (plots contained 1, 3, 5, or over 25 species). Plant species identity also was a factor influencing microbial community composition; PLFA composition significantly varied among monocultures, and among three-species combinations that differed in plant species composition. Differences among treatments within each of these comparisons were apparent in all four sampling dates of the study. There was no consistent shift in microbial community composition between wet and dry seasons, although we did see significant changes over time. Of all measured soil characteristics, soil C/N was most often associated with changes in microbial community composition across treatment groups. Our findings provide evidence for human alteration of soil microbial communities via the alteration of plant community composition and diversity and that such changes are mediated in part by changes in soil carbon quality.