关键词: 石灰性土壤, 酸性土壤, 调理剂, 微生物多样性

Abstract:

In order to safely utilize the Cd-contaminated soil， and explore the deactivation effect of amendments on Cd contaminated soil， different types of amendments were selected including biochar （BC）， inorganic amendment （TB） and organic amendment （OA）， and no amendment was control （CK）， and 3 experimental sites were set up in northern， eastern and southern of Henan， respectively. The deactivation of 3 amendments and their effects on soil microbial community structure were studied. The results showed that 3 amendments could significantly reduce the available Cd contents in soil， and the Cd content in wheat grains decreased ultimately. The pH of soil in south of Henan was incrrased after the application of amendments. Compared with CK， the available Cd content of soil in northern， eastern and southern of Henan decreased by 48.1%~86.1%， 24.2%~33% and 33.5%~54.3%， respectively， and the Cd content of wheat grains decreased by 22.2%~84.7%， 51.8%~58.2% and 24.9%~44.1%， respectively. In addition， amendments significantly changed the community composition and structure of bacteria and fungi in soil. In the northern experimental site， the abundances of Solicoccozyma and Purpureocilliun in fungi were increased by 3 amendments. In the eastern experimental site， TB treatment significantly increased the abundance of Chryseolinea in fungi， OA and TB treatments significantly increased the abundance of Subulicystidium in fungi. In the southern experimental site， BC treatment significantly increased the abundance of bacteria such as Bradyrhizobium， Bryobacter and Reyranella. In conclusion， the effects of amendment BC and OA in northern and eastern of Henan were significant， but amendment TB effect was the most significant in southern of Henan. Among them， the Cd content of grain in the northern of Henan was lower than 0.1 mg kg^-1 （national food safety standard limit）^{after amendment BC and OA application. Above results provided reference for achieving food security production.}

Key words: calcareous soils, acidic soils, amendment, microbial diversity