Microclimatic and photosynthetic characteristics of cotton field intercropping systems

doi:10.14088/j.cnki.issn0439-8114.2021.13.004

Abstract

Abstract: The microclimatic characteristics of cotton intercropping systems were discussed, and the photosynthetic characteristics of crops except cotton in intercropping system were further studied. Three cotton intercropping treatments were designed in this study, cotton intercropping soybean, cotton intercropping maize and cotton intercropping sweet potato, which were compared with cotton monoculture, soybean monoculture, maize monoculture and sweet potato monoculture. The light intensity, air humidity and air temperature of the intercropping systems were analyzed. The results showed that the diurnal variation trend of air relative humidity in each treatment was U curve, cotton intercropping patterns could improve the air humidity compared with corresponding monoculture patterns, the air humidity of soybean monoculture and maize monoculture were higher than that of cotton monoculture, but the air humidity of sweet potato monoculture was lower than that of cotton monoculture; The trend of the daily change of air temperature in each pattern showed a tendency to increase first and then decrease, cotton intercropping patterns could decrease the air temperature than the corresponding monoculture patterns, the air temperature of cotton monoculture was higher than maize monoculture, but there were no significant differences between soybean monoculture and sweet potato monoculture. In soybean monoculture, maize monoculture and sweet potato monoculture, the phenomenon of “photosynthetic midday break” appeared. The phenomenon of “photosynthetic midday break” of soybean and sweet potato under intercropping pattern was obviously improved. The changes of net photosynthetic rate, stomatal conductance and transpiration rate were consistent：soybean monoculture treatment > cotton intercropping soybean treatment, sweet potato monoculture pattern > cotton intercropping sweet potato treatment, cotton intercropping maize treatment > maize monoculture treatment, but the manifestation of the concentration of intercellular CO₂ was opposite. Overall, cotton intercropping sweet potato model had more advantages than other intercropping models in improving the phenomenon of “photosynthetic midday break”, reducing the air temperature and increasing the air humidity in the system.

Key words: cotton, intercropping systems, microclimatic characteristics, photosynthetic characteristics

CLC Number:

S344.2
S562

CUI Ai-hua, LIU Shuai, HUANG Guo-qin. Microclimatic and photosynthetic characteristics of cotton field intercropping systems[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(13): 18-25.

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