Changes of soil microbial biomass and bacterial community structure in Dongting Lake: Impacts of 50,000 dams of Yangtze River
Changes of soil microbial biomass and bacterial community structure in Dongting Lake: Impacts of 50,000 dams of Yangtze River
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DOI：
10.1016/j.ecoleng.2013.04.038
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发表时间：
2013-08
影响因子：
3.8
通讯作者：
Haipeng Wu;G. Zeng;Jie Liang;Jiachao Zhang;Qing Cai;Huang Lu;Xiaodong Li;Hui-na Zhu;
中科院分区：
文献类型：
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作者：
Haipeng Wu;G. Zeng;Jie Liang;Jiachao Zhang;Qing Cai;Huang Lu;Xiaodong Li;Hui-na Zhu;
在这项研究中，我们研究了在长江流域修建∼5万座大坝对洞庭湖土壤微生物量和细菌群落结构的可能影响。洞庭湖是中国的第二大淡水湖。土壤样品采集于表层土壤沉积早期(70年代以前)或近几年的16个研究点。测定了土壤性质、土壤微生物量和细菌群落结构。用冗余度分析(RDA)同时评价土壤性质与细菌群落组成的关系。结果表明，早期沉积土样与新近沉积土样在土壤质地等性质上存在显著差异。以微生物量碳为代表的土壤微生物量碳从686万μ/g土壤显著增加到1324g/g土壤。细菌群落结构发生了明显变化，Shannon-Weiner多样性指数从2.39显著增加到2.92。尽管造成这些变化的原因可能是多方面的，但这5万座大坝将是根本原因，因为它们减小了排入洞庭湖的泥沙的颗粒尺寸，泥沙影响土壤特性。
In this study, we examined possible impacts of construction of ∼50,000 dams throughout the Yangtze River watershed on the soil microbial biomass (SMB) and bacterial community structure in Dongting Lake which is the second largest fresh lake in China. Soil samples were collected from 16 study sites where the surface soil was deposited in early stage (before 1970s) or recently years. Soil properties, SMB and bacterial community structure were measured. Relationship between soil properties and bacterial community compositions was simultaneously evaluated by redundancy analysis (RDA). The results indicated that there were significant differences in soil texture and other soil properties between the early sedimentary soil samples and the recently sedimentary soil samples. As a representative for SMB, microbial biomass carbon (MBC) had a significant increase from 686 to 1324 μg C/g soil. Bacterial community structure had an obvious change, and Shannon–Weiner diversity index had a significant increase from 2.39 to 2.92. Although causes for these changes could be multiple, these 50,000 dams would be the root causes as they decreased the grain-sizes of sediment, which affected soil properties, discharged into Dongting Lake.