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以６个中熟水、陆稻品种为材料，研究了在不同土壤水分状况下水稻光合速率与物质运转的特点。叶片光合速率随土水势的下降而减小，抗旱性品种减小的幅度小于抗旱性较差的品种。长期低土壤水分处理后，群体光合能力的下降主要是由于叶面积的减小。低土壤水分处理导致叶片中蔗糖和总可溶性糖含量的增加，淀粉含量的减少。淀粉／可溶性糖、淀粉／蔗糖与相对产量（处理／对照）呈极显著正相关（ｒ＝０．９８５４、ｒ＝０．９４１２）。低土壤水分处理下，抽穗期茎鞘中可用性糖（可溶性糖十淀粉）累积量减少，抽穗后运转率增加，抗旱性品种的相对累积量（处理／对照）高于抗旱性较差的品种，但运转率的大小与品种的抗旱性无明显联系。
Six medium maturing and upland rice cultivars were used to study the characteristics of photosynthetic rate and photosynthetic rate under different soil moisture conditions. The photosynthetic rate of leaves decreased with the decrease of soil water potential, and the decreasing extent of drought-resistant varieties was less than that of the ones with poor drought resistance. After long-term low soil moisture treatment, the decrease of population photosynthetic capacity was mainly due to the decrease of leaf area. Low soil moisture treatment resulted in an increase in sucrose and total soluble sugars in leaves and a decrease in starch content. The starch / soluble sugar, starch / sucrose had a significantly positive correlation with the relative yield (treatment / control) (r = 0.9854, r = 0.9412). Under low soil moisture treatment, the availability of soluble sugars (soluble sugar-starch) in heading and heading stages decreased, and the heading rate increased, the relative accumulation (treatment / control) of drought-tolerant cultivars was higher than those with less drought resistance, However, there is no obvious correlation between the rate of operation and drought resistance of cultivars.