重金属镉胁迫下秸秆还田对水稻光合特性的影响

Effects of Applying Crop Straw in Soil on Photosynthetic Characteristics of Rice under Heavy Metal Stress

通过模拟重金属污染并在土壤中施用油菜、小麦秸秆,研究不同秸秆处理对水稻在重金属胁迫下的生长及光合特性影响。结果表明:油菜和小麦秸秆处理均显著提高了水稻的净光合速率、气孔导度和蒸腾速率;小麦秸秆处理显著提高了水稻的生物量;油菜秸秆处理对地上部和地下部的淀粉及可溶性总糖含量均无显著影响,但小麦秸秆处理显著提高了地上部的淀粉和可溶性总糖含量,降低了地下部的可溶性总糖含量。因此,秸秆施用有利于提高水稻对重金属的抗性,不同秸秆效果不同。

By applying the crop straws in cadmium contaminated soil, the effects of different kinds of crop straws on photosynthetic characteristics of rice are studied in this paper. The results showed that the straw of rape and straw of wheat significantly increases the net photosynthetic rate, stomatal conductance and transpiration rate under cadmium stress. The total biomass of rice is significantly increased by applying straw of wheat in cadmium treated soil compared with control. There are no obvious effects on the content of starch and total sugar after both straws of rape and wheat. However, applying straw of wheat in cadmium treated soil significantly increases the content of starch and total sugar in over ground part, but decreases the content of total sugar in underground part compared with control. Therefore, applying the straw of rape and wheat in Cd contaminated soil can improve the resistance of heavy metal of rice, and different kind of straw had different treatment effects.