Effects of annual wheat-maize‖peanut rotation on soil physicochemical properties and organic carbon
To better understand rotation effects of annual wheat-maize‖peanut pattern on carbon accumula-tion,field experiments were conducted to investigate the changes of annual plant carbon accumulation,soil bulk density,soil aggregate,0-100 cm soil water content and soil organic carbon.Five patterns were set up,namely,wheat-peanut rotation(W-P),wheat-maize rotation(W-M),wheat-maize‖peanut(row ratio 3:4,W-M‖P1),wheat-maize‖peanut(row ratio 3:6,W-M‖P2),wheat-maize‖peanut(row ratio 6:8,W-M‖P3).Results showed that car-bon accumulation of peanut and corn in intercropping mode was significantly lower than those in monoculture mode in 2018-2019,but the carbon-land equivalent ratio of intercropping mode was greater than 1,and M‖P2 treatment was the largest.Compared with maize(W-M),the carbon accumulation of wheat(W-M‖P)and peanut(W-P)in in-tercropping increased by 487.09 kg/hm2 to 1148.08 kg/hm2.Intercropping decreased the bulk density of 0-10 cm soil layer in winter wheat season,and increased the proportion of small particle aggregates(0.25-2 mm)in deep soil of winter wheat season and micro-aggregates(<0.25mm)in surface soil of winter wheat season.In the 3 intercrop-ping modes,the water use efficiency of M‖P2 was significantly higher than those of M‖P1 and M‖P3,increasing by 3.22%and 8.29%,respectively.Intercropping increased the organic carbon content of aggregates in 0-60 cm soil layer of winter wheat season,and increased the soil organic carbon content and storage in 0-60 cm soil layer of wheat stubble.The organic carbon storage of W-M‖P2 increased by 2.55%and 4.05%compared with W-M and W-P,respectively.In conclusion,the wheat-maize‖peanut annual rotation model reduced the bulk density of surface soil,improved the structure of deep soil small aggregates and surface micro-aggregates,increased carbon accumula-tion and water use efficiency of crop plants,and increased soil organic carbon storage in 0-60 cm soil layer.
wheat-maize‖peanutsoil physical and chemical propertiescarbon accumulationwater use efficiency
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