Song Hong-Li, Wang Li-Zhi, Yu Wan-Ni, Wu Xi-Yuan
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276005, China.
Huan Jing Ke Xue. 2018 Aug 8;39(8):3910-3916. doi: 10.13227/j.hjkx.201710216.
The Yellow River Delta has been facing the threat of functional degradation during the recent years. The Water-Sediment Regulation Project not only supplements abundant freshwater, but also alters the sediment burial and heavy metal levels, which affects vegetation growth. Thus, we selected the pioneer species , to study the effects of different sediment burial depths (0, 3, 6, 12 cm) and exogenous Cd inputs (0, 0.5, 1.0, 1.5 mg·kg) on biomass allocation and activities of antioxidative enzymes in the coastal wetlands of the Yellow River delta. The results showed that a shallow or moderate burial depth had a stimulatory effect on chlorophyll content, while an excessive burial depth inhibited the growth of and chlorophyll content. With increasing Cd input, chlorophyll content and dry mass decreased. At a lower Cd input and moderate burial depth, activities of CAT and SOD increased, and at high levels, SOD activities decreased, while activities of CAT at a 12 cm burial depth and 1.0 mg·kg, 1.5 mg·kg Cd input were higher than those for the control (62.66% and 58.56%). CAT activities reached high values (15.76 U·mg) at a high Cd input (1.5 mg·kg) and burial depth (12 cm). Analysis of variance showed that Cd input had a significant effect on protein content, and CAT and SOD activities, and sediment burial depth had a significant effect on the protein content and SOD activities. Interaction between Cd input and sediment burial depth had a significant effect on CAT and SOD activities (<0.05). These results demonstrated that sediment burial depth and Cd input had a great influence on the growth of , and to some extent, could change its biomass allocation and antioxidative enzyme activities to adapt to severe environments.
近年来，黄河三角洲面临着功能退化的威胁。调水调沙工程不仅补充了丰富的淡水，还改变了沉积物埋藏和重金属含量，进而影响植被生长。因此，我们选择先锋物种，研究不同沉积物埋藏深度（0、3、6、12厘米）和外源镉输入（0、0.5、1.0、1.5毫克·千克）对黄河三角洲滨海湿地生物量分配和抗氧化酶活性的影响。结果表明，浅埋或适中的埋藏深度对叶绿素含量有促进作用，而过度埋藏深度则抑制了该物种的生长和叶绿素含量。随着镉输入量的增加，叶绿素含量和干质量下降。在较低的镉输入量和适中的埋藏深度下，CAT和SOD活性增加，而在高镉输入量时，SOD活性下降，而在12厘米埋藏深度和1.0毫克·千克、1.5毫克·千克镉输入量时，CAT活性高于对照（分别为62.66%和58.56%）。在高镉输入量（1.5毫克·千克）和埋藏深度（12厘米）下，CAT活性达到较高值（15.76 U·毫克）。方差分析表明，镉输入对蛋白质含量、CAT和SOD活性有显著影响，沉积物埋藏深度对蛋白质含量和SOD活性有显著影响。镉输入与沉积物埋藏深度之间的相互作用对CAT和SOD活性有显著影响（P<0.05）。这些结果表明，沉积物埋藏深度和镉输入对该物种的生长有很大影响，并且在一定程度上，该物种可以改变其生物量分配和抗氧化酶活性以适应恶劣环境。
