title: Dynamics of soil available phosphorus and its impact factors under simulated climate change in typical farmland of Taihu Lake region, China.
abstract: Global climate change affects the availability of soil nutrients, thereby influencing crop productivity. This research was conducted to investigate the effects of elevated CO2, elevated temperature, and the interaction of the elevated CO2 and temperature on the soil available phosphorus (P) of a paddy-wheat rotation in the Taihu Lake region, China. Winter wheat (Triticum aestivum L.) was cultivated during the study period from 2011 to 2014 at two CO2 levels (350 μL•L(-1) ambient and 500 μL•L(-1) elevated by 150 μL•L(-1)) and two temperatures (ambient and 2 °C above the ambient). Soil available P content increased at the first season and decreased at the last season during the three wheat growing seasons. Soil available P content showed seasonal variation, whereas dynamic changes were not significant within each growing season. Soil available P content had no obvious trends under different treatments. But for the elevated temperature, CO2, and their combination treatments, soil available P content decreased in a long time period. During the period of wheat ripening stage, significant positive correlations were found between soil available P content and saturated hydraulic conductivity (Ks) and organic matter, but significant negative correlations with soil clay content and pH value; the correlation coefficients were 0.9400 (p < 0.01), 0.9942 (p < 0.01), -0.9383 (p < 0.01), and -0.6403 (p < 0.05), respectively. Therefore, Ks, organic matter, soil clay, and pH were the major impact factors on soil available P content. These results can provide a basis for predicting the trend of soil available P variation, as well as guidance for managing the soil nutrients and best fertilization practices in the future climate change scenario.
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.|State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
authors.forename: Kaihao
authors.initials: K
authors.lastname: Yu
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China. xmchen@njau.edu.cn.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Genxing
authors.initials: G
authors.lastname: Pan
authors.affiliation: College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Xuhui
authors.initials: X
authors.lastname: Zhang
authors.affiliation: College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China.
authors.forename: Can
authors.initials: C
authors.lastname: Chen
mesh_terms: D000383:Agriculture; D002681:China; D002980:Climate; D057231:Climate Change; D004784:Environmental Monitoring; D060106:Lakes; D010758:Phosphorus / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D014908:Triticum
chemical_list: D012987:Soil; D010758:Phosphorus
keywords: Available phosphorus; Climate change; Elevated CO2; Elevated temperature; Winter wheat