关键词: 蓟马, 蓟马, 生物学特性, 生态学特性, 为害, 化学防治, 生物防治, 物理防治, 害虫综合治理

Abstract: Studies on the morphological and physiological properties of Panicum repens L. were conducted under both water and heavy metal stress, in view of the urgency of eco-restoration of hydro-fluctuation belts of polluted rivers and their special alternation environment of wetting and drying, to provide references for constructingPanicum repens L.-hydro-fluctuation belt ecological system. This experiment was conducted with pot- cultured method and 5 treatments compositing 2 factors of water and heavy metal were adopted. The results showed that: the total average values of the plant absolute height and branch number ofPanicum repens L. under the low-Cd-Pb-and-flooded treatment with 42 days were higher than that under CK; in addition, although the total average of the plant absolute height and branch number ofPanicum repens L. under high- Cd-Pb-and-flooded treatment were lower than that under CK, but the differences between H-Cd-Pb-flooded treatment were not significant (P >0.05), i.e.Panicum repens L. could maintain normal growth; however, the plant absolute height and branch number ofPanicum repens L. were inhibited under both L-Cd-Pb-drought and H-Cd-Pb-drought treatments; during the experiments under Cd-Pb-drought treatments, the plant had wilt phenomenon in 14 days, and then leaf blade was dry in 21 days, even all the plants were dead in 35 days for those under L-Cd-Pb-drought and in 28 days for those under H-Cd-Pb-drought; as for the physiological features, the proline content and malondialdehyde content under both L-and H-Cd-Pb-flooded treatments were all close to those values under CK and the differences between Cd-Pb-flooded treatments and CK were not significant (P >0.05), which indicated that the hurt from Cd-Pb-flooded treatment were light; however, the proline and malondialdehyde content under both L-and H-Cd-Pb-drought treatments were all significantly higher than those values under CK (P >0.05), which suggested a very active physiological response ofPanicum repens L. to L-and H-Cd-Pb-drought treatments.