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.
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Acknowledgments
The authors thank Dr. Christopher Ogden (Cornell Medical College in Qatar) for proof reading and comments on this paper. We also wish to express our gratitude to anonymous reviewers for providing useful comments to improve the paper. This study is jointly supported by funding from “Special Fund for Agro-scientific Research in the Public Interest” (Impact of climate change on agricultural production of China, No. 200903003), the Natural Science Foundation of Jiangsu Province, China (No. SBK 2015040286), Laboratory of Soil and Sustainable Agriculture (Institute of Soil Science, Chinese Academy of Sciences, No. 0812201208), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Yu, K., Chen, X., Pan, G. et al. Dynamics of soil available phosphorus and its impact factors under simulated climate change in typical farmland of Taihu Lake region, China. Environ Monit Assess 188, 88 (2016). https://doi.org/10.1007/s10661-015-5087-0
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DOI: https://doi.org/10.1007/s10661-015-5087-0