Interaction effect of intercropping and reduced irrigation on greenhouse gas emissions from farmland soil
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DOI:10.7606/j.issn.1000-7601.2024.01.22
Key Words: intercropping  reduced irrigation  soil  greenhouse gas emission  maize  pea
Author NameAffiliation
YIN Minxing State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China 
ZHAO Cai State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China 
GE Lili State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China 
CHENG Baoyu State Key Laboratory of Arid Land Crop Science, College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China 
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Abstract:
      Based on the positioning experiment of different irrigation levels and planting patterns in Wuwei City, Gansu Province in 2014,two irrigation levels of reduced irrigation (495 mm, I1) and conventional irrigation (540 mm, I2) and three cropping patterns with maize intercropping with pea (M‖P), monocropping peas (P) and monocropping maize (M)were set up. Soil respiration rate, N2O emission rate, total greenhouse gas emissions from farmland, global warming potential (GWP), and greenhouse gas emission intensity (GHGI) were measured. The two\|year results from 2021 and 2022 showed that, (1)Both I1 and M‖P treatments significantly reduced soil respiration rate, N2O emission rate, total CO2 emissions and total N2O emissions (P<0.05). The interaction between reduced irrigation and intercropping mode was significant (P<0.05). Compared with MPI2 treatment, MPI1 treatment reduced soil respiration rate, N2O emission rate, total CO2 emissions and total N2O emissions by 8.39%, 33.12%, 8.75% and 32.84%, respectively. (2) The soil temperature and soil water content of I2 treatment were significantly higher than those of I1 treatment (P<0.05). Under different planting patterns, the overall soil temperature was M>M‖P>P during the whole growth period. Correlation analysis showed that soil temperature and soil water content were significantly positively correlated with soil respiration rate and N2O emission rate.(3)The irrigation level had no significant effect on crop yield (P>0.05), while the planting mode had a significant effect on crop yield (P<0.01), indicating that M‖P treatment yields were the highest. The interaction effect between reduced irrigation and planting pattern had a significant effect on GWP and GHGI (P<0.05), and compared with MPI2, the GWP and GHGI of MPI1 treatment were significantly reduced by 9.45% and 10.00%, respectively. In oasis irrigation area, reduced irrigation combining with maize intercropping with pea planting pattern effectively increased crop yield and reduced greenhouse gas emissions and should be used as a planting pattern for promotion and application in oasis irrigation area.