| Effects of different soil organic carbon contents on photosynthetic physiology and growth of maize |
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| DOI：10.7606/j.issn.1000-7601.2022.01.27 |
| Key Words: soil organic carbon photosynthetic physiological growth and development leaf water use efficiency maize |
| Author Name | Affiliation | | GUO Zhanqiang | Institute of environmental engineering, Ningxia University,Yinchuan, Ningxia 750021, China | | XIAO Guoju | School of Ecological Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | LI Xiujing | Institute of environmental engineering, Ningxia University,Yinchuan, Ningxia 750021, China | | HU Yanbin | School of Atmospheric Science, Lanzhou University, Lanzhou, Gansu 730020, China |
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| Abstract: |
| Using the field sampling method of farmland ecosystem, the sample location was determined by the checkerboard distribution method. Five representative soil organic carbon T1(2.44 g·kg-1), T2(3.70 g·kg-1), T3(4.95 g·kg-1), T4（6.14 g·kg-1）, T5（7.51 g·kg-1） were selected according to different soil organic carbon contents to explore the effects of different soil organic carbon (SOC) contents on the photosynthetic physiological characteristics of maize water use efficiency, dry matter accumulation and growth. The results showed that net photosynthetic rate of maize was positively correlated with SOC, which increased from T1 to T5 in the tapping stage. The net photosynthetic rate increased from 31.22 μmol·m-2·S-1 to 54.22 μmol·m-2·s-1. Transpiration rate decreased first and then increased in each growth period.Stomatal conductance increased from 0.06 mol·m-2·s-1 to 0.28 mol·m-2·s-1 from T1 to T5 at flowering. There was a negative correlation between intercellular CO2 concentration and SOC, which increased from T1 to T5 at jointing and decreased from 491.57 μmol·mol-1to 112.79 μmol·mol-1. At jointing, the leaf water use efficiency increased from 1.62 μmol·mmol-1 to 10.22 μmol·mmol-1 from T1 to T5. In the opening, chlorophyll increased with the increase of SOC, but there was no significant relationship between them in the flowering, silking and maturing. In flowering, the plant height increased by 20.37%, stem diameter increased by 23.70%, leaf area per plant increased by 13.83%, leaf area index increased by 13.70%. From T1 to T4, single ear weight increased from 156.13 g·kg-1 to 236.18 g·kg-1, and aboveground dry weight increased from 235.7 g to 380.22 g. The effect of SOC on photosynthetic characteristics and growth and development of maize was positive, but it was not necessarily that the more, the better. T4 (6.14 g·kg-1) was the most ideal, which could be used as an important reference value for the study of carbon storage, carbon neutralization and carbon peaking in farmland ecosystem. |
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