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当土壤相对含水量低于75 %，光合非气孔限制因素开始出现。
When relative soil water is below 75%, the cause of photosynthesis rate drop is non-stomatal limitation.
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两种隔盐处理均可降低非气孔因素对光合的限制。
Both of the two measures reduced the limitation of photosynthesis by non stomatal factors.
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