title: Effect of rice straw application on microbial community and activity in paddy soil under different water status.
abstract: Rice straw application and flooding are common practices in rice production, both of which can induce changes in the microbial community. This study used soil microcosms to investigate the impact of water status (saturated and nonsaturated) and straw application (10 g kg(-1) soil) on soil microbial composition (phospholipid fatty acid analysis) and activity (MicroResp(™) method). Straw application significantly increased total PLFA amount and individual PLFA components independent of soil moisture level. The amount of soil fungal PLFA was less than Gram-negative, Gram-positive, and actinomycete PLFA, except the drained treatment with rice straw application, which had higher fungal PLFA than actinomycete PLFA at the initial incubation stage. Straw amendment and waterlogging had different effects on microbial community structure and substrate-induced pattern. PLFA profiles were primarily influenced by straw application, whereas soil water status had the greater influence on microbial respiration. Of the variation in PLFA and respiration data, straw accounted for 30.1 and 16.7 %, while soil water status explained 7.5 and 29.1 %, respectively. Our results suggest that (1) the size of microbial communities in paddy soil is more limited by carbon substrate availability rather than by the anaerobic conditions due to waterlogging and (2) that soil water status is more important as a control of fungal growth and microbial community activity.
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China.|University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
authors.forename: Fuxia
authors.initials: F
authors.lastname: Pan
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China.
authors.forename: Yaying
authors.initials: Y
authors.lastname: Li
authors.affiliation: The James Hutton Research Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK.
authors.forename: Stephen James
authors.initials: SJ
authors.lastname: Chapman
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China. hyyao@iue.ac.cn.
authors.forename: Huaiying
authors.initials: H
authors.lastname: Yao
mesh_terms: D002244:Carbon / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D005658:Fungi; D012275:Oryza / Q000254:growth & development; D010743:Phospholipids / Q000032:analysis; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D014867:Water / Q000032:analysis
chemical_list: D005227:Fatty Acids; D010743:Phospholipids; D012987:Soil; D014867:Water; D002244:Carbon
keywords: MicroResp™; Microorganism; Phospholipid fatty acid analysis; Soil water status; Straw application