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以花生单作为对照,设置30、35、40、45、50 cm 5个木薯花生间作行距,播种90 d后测定花生叶片的净光合速率、叶绿素含量及叶绿素荧光参数。结果表明,与单作对照相比,间作花生的光合速率(Pn)、叶绿素含量(Chl a+b)、初始荧光(Fo)、光化学猝灭系数(qP)降低;最大荧光(Fm)、可变荧光(Fv)、最大光化学效率(Fv/Fm)、潜在光化学活性(Fv/Fo)、非光化学淬灭系数(qN)升高;且窄行距(30~35 cm)处理的Pn、Fv、Fv/Fm、Fv/Fo、表观光合电子传递速率(ETR)、实际光化学量子效率(Yield)高于宽行距(45~50 cm)处理。间作遮荫使花生功能叶片的光合速率和叶绿素含量降低,叶绿素荧光参数的一系列变化是花生对间作遮荫的适应性反应。
Taking peanut single as control, five cassava peanuts with row spacing of 30, 35, 40, 45 and 50 cm were set for interplanting spacing. Net photosynthetic rate, chlorophyll content and chlorophyll fluorescence parameters of peanut leaves were measured 90 days after sowing. The results showed that the photosynthetic rate (Pn), chlorophyll content (Chl a + b), initial fluorescence (Fo) and photochemical quenching coefficient (qP) Fv, Fv / Fm and potential photochemical activity (Fv / Fo) and non-photochemical quenching coefficient (qN) were increased. Pn, Fv and Fv / Fm, Fv / Fo, ETR, and actual photochemical quantum yield (Yield) were higher than those with wide row spacing (45-50 cm). Intercropping with shading decreased the photosynthetic rate and chlorophyll content of functional leaves of peanut. A series of changes of chlorophyll fluorescence parameters were the adaptive responses of peanut to shade.