det365娱乐官网

Effect of reclamation of abandoned salinized farmland on soil bacterial communities in arid northwest China

发布者:绿洲生态发布时间:2019-09-16浏览次数:13

Effect of reclamation of abandoned salinized farmland on soil bacterial communities in arid northwest China


Zhibo Cheng   , Yun Chen  , Fenghua Zhang


Abstract: Understanding the impact of reclamation of abandoned salinized farmland on soil bacterial  community is of great importance for maintaining soil health and sustainability in arid regions. In this study,we used field sampling and 454 pyrosequencing methods to investigate the effects of 5-year reclamation treatments on soil properties, bacterial community composition and diversity.The four reclamation treatments are:abandoned salinized farmland (CK), cropland (CL), grassland (GL) and woodland (WL). We have found soil properties are significantly altered by abandoned salinized farmland reclamation. In particular, the lowest soil pH and electrical conductivity (EC) values are observed in CL (P b 0.05). The dominant phyla are Firmicutes, Proteobacteria, Chloroflexi, Actinobacteria and Acidobacteria in all treatments. At the genus levels, the relative abundance of Bacillus, Lactococcus, Streptococcus and Enterococcus in CK, GL and WL is significantly higher than in CL. Bacterial diversity indices(i.e.ACE,Chaoand Shannon)dramatically increaseafterthe reclamation, with thehighest inCL.Similar patterns of bacterial communities havebeen observed in CK, GL and WL soils, but significantly different from CL. Regression analyses indicate that the relative abundance of these phyla are significantly correlated with soil Fe, pH and EC. Results from non-metric multidimensional scaling (NMDS) and redundancy analysis (RDA) indicate that soilFecontent, ECand pH are the mostimportant factors inshaping soilbacterial communities. Overall, results indicate that abandoned salinized farmland reclaimed for CL significantly decrease soilpHand EC, and increase soil bacterial community diversity. Soil Fe concentration, EC and pH are the dominant environmental factors affecting soil bacterial community composition. The important role of Fe concentration in shaping bacterial community composition is a new discovery among the similar studies.

Baidu
sogou