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以单作玉米和单作花生为对照,研究了间作玉米花生功能叶片的光合速率、PSⅡ最大光化学效率(Fv/Fm)和PSⅡ实际光化学效率(ΦPSⅡ)的日变化以及叶绿素含量。结果表明,间作提高了玉米、花生叶绿素含量,其光合速率日变化呈单峰曲线,中午达到最大值;玉米南北行向种植东侧功能叶片的光合速率,上午间作明显大于单作,下午相反;间作明显提高了玉米阴天和晴天的光合速率,却明显降低了花生光合速率;在晴天,间作玉米花生的Fv/Fm、ΦPSⅡ日变化均呈倒抛物线,上午间作玉米明显大于单作的,下午相反,间作明显提高了花生的Fv/Fm,中午花生的ΦPSⅡ间作低于单作,上午和下午反之;阴天的Fv/Fm、ΦPSⅡ,间作玉米除中午小于外,上午和下午均大于单作玉米,间作花生全天均高于单作花生,说明玉米花生间作提高了花生对弱光的吸收利用效率。
The daily changes of photosynthetic rate, maximum photochemical efficiency of PSⅡ (Fv / Fm) and actual photochemical efficiency of PSⅡ (ΦPSⅡ) as well as chlorophyll content of maize peanut were studied using single crop corn and single crop peanut as control. The results showed that the intercropping increased the chlorophyll content of maize and peanut, and the diurnal variation of photosynthetic rate showed a single peak curve, reaching the maximum at noon. The photosynthetic rate of functional leaves from south to north of maize planting in the east was significantly larger than that in monoculture, Intercropping significantly increased the photosynthetic rate of corn on cloudy days and sunny days, but significantly reduced the photosynthetic rate of peanut. On sunny days, the daily variations of Fv / Fm and ΦPSⅡ of intercropped corn and peanut were both inverted parabolas. On the contrary, intercropping significantly increased the Fv / Fm of peanut, and the intercropping of ΦPSⅡon peanut was lower than that of single intercropping at the noon, whereas the morning and afternoon were greater than that of the single intercropping of Fv / Fm, ΦPSⅡ and intercropping corn except cloudy at noon Maize and intercropping peanut were higher than monoculture peanut all day, which indicated that peanut intercropping improved the absorption and utilization efficiency of low light on peanut.