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| Effects of elevated CO2 and warming on soil carbon, nitrogen and phosphorus transformation-linked enzymes activities at different millet growth stages |
| Received:December 15, 2020 |
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| KeyWord:climate change;elevated CO2;warming;millet;growth stage;soil enzyme |
| Author Name | Affiliation | E-mail | | WANG Xuesong | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | ZHENG Fenli | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China | flzh@ms.iswc.ac.cn | | WANG Jing | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | JIAO Jianyu | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | ZHAO Miaomiao | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| Pot control experiments were adopted to study the responses of these soil transformation-linked enzyme activities to elevated CO2 and warming at different growth stages of millet（Setaria italica）. Three artificial climate chambers were used to control the ambient CO2 concentration and temperature. Three climate scenarios, control（400 μmol·mol-1 CO2 concentration and 22 ℃ ambient temperature, CK）, CO2 concentration elevation（CO2 concentration 700 μmol·mol-1 and 22 ℃ ambient temperature, EC）, and CO2 concentration and temperature elevation（CO2 concentration 700 μmol·mol-1 and temperature 26 ℃）, were designed. Each climate scenario covered two water conditions（adequate water supply, i.e., 70% field capacity and mild drought, i.e., 50% field capacity）. Activities of soil β-glucosidase （βG）, β-N-acetyl glucosidase（NAG）, leucine aminopeptidase（LAP）, and alkaline phosphatase（ALP）were measured at four millet growth periods： anthesis, 10 d after anthesis, grain-filling stage, and maturity stage, respectively. The results showed that an increase in CO2 concentration from 400 μmol·mol-1 to 700 μmol·mol-1 significantly reduced LAP activity, but it increased NAG activity under adequate water supply and significantly reduced ALP activity under mild drought conditions. A temperature increase of 4 ℃ significantly inhibited soil βG and ALP activities, and the effect of the temperature increase on soil NAG activity was related to the soil water conditions. The interaction between elevated CO2 concentration and millet growth period had significant impacts on these four kinds of soil enzyme activities. The interaction between temperature increase and millet growth period had a significant effect on βG activity under the adequate water supply, and it significantly affected βG and NAG activities under the mild drought condition. In conclusion, at different millet growth stages, the impacts of elevated CO2 concentration, temperature increase, and mild drought on soil carbon, nitrogen, and phosphorus transformation-linked enzymes have different trends. |
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