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主要采用CIRAS—2便携式光合测定仪对不同的土壤水分条件下生长的柿树叶叶片净光合速率、水分的利用效果、气孔导度等进行测定,进而探讨柿树光合光响应特性对于土壤水分的响应规律。研究结果表明,土壤的水分对柿树的光合生理参数具有重要的影响:随着土壤水分的不断降低,柿树的净光合速率以及表观量子效率会先上升然后下降,而光补偿点会先降后升,光的饱和点呈现出下降的趋势。能够维持柿树高光合作用和高水分利用率的土壤含水量一般为48.8%~76.7%。
The net photosynthetic rate, water use efficiency and stomatal conductance of leaves of Persimmon were measured with CIRAS-2 portable photosynthesis apparatus. The responses of photosynthetic light response to soil moisture were also discussed. law. The results showed that soil moisture had an important effect on the photosynthetic physiological parameters of persimmon trees. With the decreasing of soil moisture, the net photosynthetic rate and apparent quantum yield of persimmon trees firstly increased and then decreased, while the light compensation point After the rise, the saturation point of light showed a downward trend. Soil moisture, which can maintain the high photosynthesis and high water use efficiency of persimmon, is generally 48.8% -76.7%.