栽培穿龙薯蓣田间持水量与光合作用的关系研究
首发时间:2010-04-15
摘要:本文对栽培穿龙薯蓣田间持水量与光合作用的关系进行了研究,为穿龙薯蓣栽培的水分管理提供参考。采用的是盆栽试验,用便携式光合测定仪进行有关光合参数的测定。结果表明,70%的田间持水量是穿龙薯蓣光合能力最强的土壤含水量,在这一条件下,蒸腾速率和水分利用效率也较高。在50%以上的含水量条件下,净光合速率日变化均呈明显的双峰曲线。70%含水量的峰值出现在中午12时和下午16时,分别为7.3、6.5μmol/m2/s,有轻微的光合“午休”现象。因此得出,栽培穿龙薯蓣以控制土壤水分含量为田间持水量的70%最佳的结论。
关键词: 穿龙薯蓣 田间持水量 净光合速率 蒸腾速率 水分利用效率
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Study on the relationship between field water capacity and photosynthesis of cultivated Dioscorea nipponica Makino
Abstract:The relationship between field water capacity and photosynthesis of cultivated Dioscorea nipponica Makino was researched in this paper to supply a reference in the herbs’ water management. The pot experiment was used and the relative photosynthesis parameters were measured with portable photosynthesis instrument. The results show that the three photosynthesis parameters of the net photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) all reached a higher value when the field water capacity was 70%. The diurnal variation of the Pn tend to a double-peak curve when the field water capacity is beyond 50%. The peak value presented at 12 o’clock and 16 o’clock, they are 7.3, 6.5μmol/m2/s respectively, show a slight “noon break” phenomena. The conclusion, therefore, is that the 70% field water capacity would be the optimum value in the Dioscorea nipponica Makino cultivation.
Keywords: Dioscorea nipponica Makino field water capacity net photosynthetic rate (Pn) transpiration rate (Tr) water use efficiency (WUE)
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