KMS Institute of soil and water conservation Chinese Academy of Sciences
Soil erosion-related dynamics of soil bacterial communities and microbial respiration | |
Haibing Xiao1; Zhongwu Li2 | |
2017-06 | |
发表期刊 | Applied Soil Ecology |
期号 | 119页码:205-213 |
摘要 | Soil erosion can dramatically change physicochemical soil properties, but little is known about the responses of bacterial communities and microbial respiration to soil erosion. In this study, three sites (upslope, mid-slope and downslope) with different erosional and depositional characteristics were selected along three transects of abandoned land in the Qiaozi watershed of the Chinese Loess Plateau to evaluate the impacts of soil erosion on bacterial communities and microbial respiration. Samples of the topsoil (0–10 cm) and subsoil (10–20 cm), classified as Calcic Cambisols, were collected from these sites. The results showed that lower bacterial abundance was observed in the topsoil of the downslope site (7.58 × 108 copies g-1 soil) relative to the upslope (9.32 × 108 copies g-1 soil) and mid-slope (8.70 × 108 copies g-1 soil) sites. However, no obvious change (P > 0.05) in the bacterial Shannon index and community composition was observed among the sites. Runoff induced erosion and migration of sediment homogenized the bacterial communities along the eroded slopes. Soil microbial respiration in the topsoil of the downslope site (19.02 ± 0.25 mg CO2-C kg-1 soil d-1) was significantly (P < 0.05) higher than that of the upslope (15.12 ± 1.07 mg CO2-C kg-1 soil d-1) and mid-slope (17.75 ± 0.73 mg CO2-C kg-1 soil d-1) sites, indicating that the deposition of sediment and associated organic matter significantly increased the soil microbial respiration. Multiple stepwise regression analyses showed that available nitrogen was the main explanatory factor for the variation in soil microbial respiration in both the topsoil (60.2%, P = 0.009) and subsoil (80.3%, P = 0.002). Compared to the bacterial properties, the labile organic matter contributed more to the variation. Our work suggested that soil microbial respiration was primarily modulated by the quality of the organic matter. |
关键词 | Soil Erosion Soil Organic Matter Bacterial Community Bacterial Abundance Soil Microbial Respiration |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | sbir.nwafu.edu.cn/handle/361005/8826 |
专题 | 水保所2018--2022届毕业生论文(学位论文、期刊论文) |
通讯作者 | Zhongwu Li |
作者单位 | 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation CAS and MWR, Yangling, Shaanxi, 712100, P. R. China 2.College of Environmental Science and Engineering, Hunan University, Changsha, 410082, P.R. China |
推荐引用方式 GB/T 7714 | Haibing Xiao,Zhongwu Li. Soil erosion-related dynamics of soil bacterial communities and microbial respiration[J]. Applied Soil Ecology,2017(119):205-213. |
APA | Haibing Xiao,&Zhongwu Li.(2017).Soil erosion-related dynamics of soil bacterial communities and microbial respiration.Applied Soil Ecology(119),205-213. |
MLA | Haibing Xiao,et al."Soil erosion-related dynamics of soil bacterial communities and microbial respiration".Applied Soil Ecology .119(2017):205-213. |
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