Experimental analysis of the effect of exotic and native plant species on the structure and function of soil microbial communities
Experimental analysis of the effect of exotic and native plant species on the structure and function of soil microbial communities
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DOI：
10.1016/s0038-0717(03)00120-2
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发表时间：
2003-07-01
影响因子：
9.7
通讯作者：
Häggblom, M
中科院分区：
文献类型：
--
作者：
Kourtev, PS;Ehrenfeld, JG;Häggblom, M
外来植物入侵是对自然生态系统最普遍和最重要的威胁之一，然而，植物入侵对土壤过程和土壤生物区系的影响却很少被研究。我们生长了两个外来的和一个本地的林下植物物种在同一矿物土壤从非入侵的森林站，以测试是否可以在温室中实验产生的领域观察到的差异。我们的特点是在土壤微生物群落结构（PLFA指数）和功能（酶活性和SIR指数）的变化，以及潜在的氮矿化速率的变化。我们发现，两种截然不同的外来物种入侵北美东部落叶林下层，会迅速导致大多数研究土壤性质发生变化。在三个月的孵化结束时，土壤下的外来物种有显着不同的PLFA，酶和SIR配置文件比初始土壤和土壤中的本地灌木已经长大。我们还观察到一个显着增加的pH值和硝化速率下的外来植物。土壤中的这种变化可能是长期的（例如土壤pH值的变化），因此可能会促进这些和其他外来物种的再次入侵。外来植物入侵的管理和本地社区的恢复都必须考虑到外来物种对土壤的影响。(C)2003爱思唯尔科技有限公司版权所有。
Invasions of exotic plant species are among the most pervasive and important threats to natural ecosystems, however, the effects of plant invasions on soil processes and the soil biota have rarely been investigated. We grew two exotic and a native under-story plant species in the same mineral soil from a non-invaded forest stand in order to test whether observed differences in the field could be experimentally produced in the greenhouse. We characterized changes in the soil microbial community structure (as indexed by PLFAs) and function (as indexed by enzyme activities and SIR), as well as changes in potential nitrogen mineralization rates. We found that the invasion of two very dissimilar exotic species into the under-story of deciduous forests in eastern North America can rapidly cause changes in most of the studied soil properties. At the end of the three-month incubation, soils under the exotic species had significantly different PLFA, enzyme and SIR profiles than both initial soils and soils where native shrubs had been grown. We also observed a significant increase in pH and nitrification rates under one of the exotic plants. Such changes in the soil are potentially long-term (e.g. changes in soil pH) and are therefore likely to promote the re-invasion of these and other exotics. Both management of exotic plant invasions and the restoration of native communities must take into account exotic species effects on the soil. (C) 2003 Elsevier Science Ltd. All rights reserved.