不同渍水时间对苗期和花期大豆生长及碳氮代谢的影响

以大豆品种南农99.6为材料，通过盆栽试验研究了苗期和花期渍水对大豆生长及碳氮代谢的影响.结果表明: 渍水显著抑制了大豆的生长，植株生物量、叶面积、叶片色素含量和光合速率均显著下降，而丙二醛(MDA)含量显著升高；随着渍水时间的延长，各生理指标的变化幅度增大；渍水胁迫解除后有一定的恢复，渍水10 d处理后恢复能力较渍水20 d处理强.可溶性碳、氮物质及关键酶对渍水反应不同，可溶性糖含量以及叶片谷氨酰胺合成酶和蔗糖合成酶的活性上升，而可溶性蛋白含量下降.渍水对苗期大豆植株生物量、叶面积和MDA含量的影响比花期小.苗期和花期渍水时间越短，大豆受到的伤害越小，其恢复能力也越强.渍水时间在10 d内，大豆植株能够通过自身的调节逐渐恢复.

Insect diversity in wetland vegetation succession: A review

Insect diversity is an important part of wetland biodiversity,which is closely related to the vegetation in wetland ecosystem.Many environmental factors affect wetland insect diversity,and vegetation succession is the key factor.Due to the sensitivity to wetland environmental change,insect diversity is gradually applied as an indicator for the monitoring and evaluation of wetland quality,and crucial for the study of wetland conservation and restoration.This paper summarized the research progress in the vegetation succession,dominant insect groups,and variation patterns and affecting factors of insect diversity on different wetland types.The application of insect diversity as an indicator for wetland quality monitoring and evaluation was discussed,and the research gaps and priorities concerning wetland insect diversity were pointed out.