Differences in the composition and diversity of bacterial communities from agricultural and forest soils
Differences in the composition and diversity of bacterial communities from agricultural and forest soils
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DOI：
10.1016/j.soilbio.2007.06.027
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发表时间：
2008-06
影响因子：
9.7
通讯作者：
R. Upchurch;C. Chiu;K. Everett;Glen E. Dyszynski;D. Coleman;W. Whitman
中科院分区：
文献类型：
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作者：
R. Upchurch;C. Chiu;K. Everett;Glen E. Dyszynski;D. Coleman;W. Whitman
在美国佐治亚州南部山前马蹄湾的常规耕作(CT)和免耕(NT)农田、再生30年后的演替林(NF)和马蹄湾的老森林(F)制备的rRNA基因库中，鉴定了干扰和土地管理造成的土壤细菌群落的差异。在美国北卡罗来纳州西部阿巴拉契亚山脉南部的Coweeta长期生态研究遗址(CWT)，经过80年的再生，也从森林中建立了图书馆。农田土壤的细菌群落组成与马蹄湾和CWT森林土壤不同，许多最丰富的OTU也不同。同样，森林细菌群落的多样性也低于农田。森林土壤中多样性较低的原因是森林土壤中存在少量非常丰富的类群，而这些类群丰度较低或在农田土壤中没有。再生30a后，根际土壤细菌群落组成与根际土壤基本一致，但多样性较大。这些结果表明，在这些研究的时间尺度内，土壤中的细菌群落变化缓慢。相比之下，马蹄湾和考维塔土壤中细菌群落的组成和多样性非常相似。因此，尽管土壤性质、植被和气候不同，但这种森林土壤细菌群落分布广泛，对地上植被的干扰具有弹性。
Differences in the bacterial communities of soils caused by disturbances and land management were identified in rRNA gene libraries prepared from conventional tilled (CT) and no tilled (NT) cropland, a successional forest after 30y of regrowth (NF) and an old forest of >65y (OF) at Horseshoe Bend, in the southern Piedmont of Georgia (USA). Libraries were also prepared from forests after 80y of regrowth at the Coweeta Long Term Ecological Research site (CWT) in the Southern Appalachians of western North Carolina (USA). The composition of the bacterial communities in cropland soils differed from those of the Horseshoe Bend OF and CWT forest soils, and many of the most abundant OTUs were different. Likewise, the diversity of bacterial communities from forest was less than that from cropland. The lower diversity in forest soils was attributed to the presence of a few, very abundant taxa in forest soils that were of reduced abundance or absent in cropland soils. After 30y of regrowth, the composition of the bacterial soil community of the NF was similar to that of the OF, but the diversity was greater. These results suggested that the bacterial community of soil changes slowly within the time scale of these studies. In contrast, the composition and diversity of the bacterial communities in the Horseshoe Bend OF and Coweeta soils were very similar. Thus, this forest soil bacterial community was widely distributed in spite of the differences in soil properties, vegetation, and climate as well as resilient to disturbances of the above ground vegetation.