Effects of elevated temperature on a paddy soil N fertility

2016 Fiscal Year Final Research Report

• Project/Area Number: 26850035
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plant nutrition/Soil science
• Research Institution: Chiba University
• Principal Investigator: Yashima Miwa (松島未和) 千葉大学, 大学院園芸学研究科, 講師 (60527927)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 窒素無機化 / 水田土壌 / 地球温暖化 / 高濃度二酸化炭素環境 / 土壌炭素 / 土壌窒素

Outline of Final Research Achievements

We tested the effects of in situ soil temperature elevation, elevated air CO2 concentration, and no N fertilization for 6 years on paddy soil fertility. The results showed that there was no statistically significant fertility decrease. On the other hand, easily decomposed soil C decreased only in CO2 elevated treatment after a few years of treatment. This result may indicate that elevated air CO2 concentration decreases soil C stock in a long term. The management practice of organic matter such as rice straw has much more impact than CO2 concentration and N fertilization do.
Global warming leads soil temperature raise. And soil N mineralization increases. Our study showed that 1st order kinetics and effective temperature theory can estimate the amount of soil N mineralization and N supply for plants under a global warming environment as well.

Free Research Field

土壌肥料学