Influence of Elevated Atmospheric Temperature and CO2 Concentration on Plant and Soil N Concentration and Yield of Early Rice in Hubei

doi:10.3969/j.issn.1000-6362.2016.02.013

Abstract

Abstract:

Using a modified open-top chamber（OTC）method to simulate relative 60μL·L^-1 CO₂concentration increment and 2℃ temperature rise scenario in early rice field to study their impacts on the plant total nitrogen, soil N concentration and yield in Hubei. The experimental design consisted of four treatments arranged in randomized blocks and three replicates. Treatments were as follows: (1)the control OTC(CK, ambient CO₂ concentration and temperature), (2)elevated air temperature by 2℃(IT), (3)elevated CO₂ concentration by 60μL·L^-1(IC), (4)air temperature increase by 2℃ plus 60μL·L^-1 CO₂ concentration elevated(IT+IC). Surveyed the plant total nitrogen content, soil ammonium nitrogen, soil nitrate nitrogen, yield and yield components of early rice. The results showed that: (1)there was a significant increase on the plant total nitrogen content during the early growth periods (especially during tillering) when atmospheric temperature and CO₂concentration rose alone and the two of them rose synchronously, but there were no obvious differences after tillering, so did the soil ammonium nitrogen. (2)Elevated temperature had a significant decrease on nitrate nitrogen content during jointing, maturity stage, and it would increase heading stage’s, while it would have a positive effect on nitrate nitrogen during jointing, maturity stage, and have a negative impact on it when CO₂ concentration elevated. (3)Compared to the control, there was a significant increase on early rice grain yield by 13.4% when CO₂ concentration rose, while there were no differences when only temperature rose or CO₂concentration elevated alone.

Key words: Open-top chamber, Temperature, CO₂concentration, Soil ammonium nitrogen, Soil nitrate nitrogen, Yield components

CAI Wei-wei, AI Tian-cheng,WAN Yun-fan,LI Jian-ling, GUO Chen. Influence of Elevated Atmospheric Temperature and CO2 Concentration on Plant and Soil N Concentration and Yield of Early Rice in Hubei[J]. Chinese Journal of Agrometeorology, 2016, 37(02): 231-237.

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