| 于亚军,李军,贾志宽,任广鑫,王蕾.宁南半干旱区不同施肥量下马铃薯光合特性研究[J].干旱地区农业研究,2005,(5):68~71 |
| 宁南半干旱区不同施肥量下马铃薯光合特性研究 |
| Photosynthetic characters of potato under different fertilizer levels in the semiarid areas of southern Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2005.05.13 |
| 中文关键词: 施肥 马铃薯 光合特性 土壤水分 宁南地区 |
| 英文关键词:fertilizer potato photosynthetic characters soil moisture southern Ningxia |
| 基金项目:国家863计划资助项目(2002AA2Z4021-2)； 国家自然科学基金项目(40371077,30471024) |
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| 中文摘要: |
| 用Li-6400便携式光合仪对宁南半干旱区不同施肥量下马铃薯盛花期功能叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)进行测定。结果表明,在马铃薯生育关键期土壤水分亏缺情况下,4种处理叶片净光合速率、蒸腾速率和气孔导度的日变化曲线均为开口向上的抛物线,而净光合速率日变化是气孔调节作用的结果。合理增加氮磷肥可以提高作物光合能力,但施肥对提高净光合速率的效应受到土壤水分状况的制约。土壤水分状况越差,增加施肥对作物光合能力的提高效应越差。高肥处理时,由于马铃薯植株生长旺盛,营养生长期水分消耗过大,生殖生长期土壤水分供应状况更差,作物受到严重的水分胁迫,导致气孔导度、净光合速率和蒸腾速率大幅下降。 |
| 英文摘要: |
| Photosynthetic characters in active leaves of potato under four different fertilizer levels were studied with Li-6400 portable photosynthesis in the semiarid areas of southern Ningxia. The results showed that, under the condition of soil water stress during the flowering stage of potato, the daily changes of net photosynthetic rate(Pn), transpiration rate(Tr) and stomatic conductance(Gs) were parabola type. The photosynthetic rate was enhanced under suitable fertilizer level (middle fertilizer), however, this effect depended on the supply status of soil moisture. Under low soil moisture condition, the effect of fertilizer on photosynthetic rate was not distinct. Under high fertilizer condition,the soil water was consumed largely during the early period,therefore,the crop suffered severe drought stress during the procreation stage, and the net photosynthetic rate(Pn), transpiration rate(Tr) and stomatic conductance(Gs) of potato declined greatly. |
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