Yang Changming, Shen Shuo, Wang Mengmeng, Li Jianhua
J Environ Biol. 2013 Apr;34(2 Spec No):367-73.
An incubation experiment was conducted to investigate the effects of simulated saltwater treatment with different percentages of artificial seawater on degradation dynamics of herbicide glyphosate and microbial activities in a riparian soil in Chongming Island, China. The results showed that 10% seawater treatment showed significantly enhancing effects on degradation efficiency of glyphosate with the lowest residual concentration among all the treatments. However, glyphosate degradation was markedly decreased in the riparian soil with 20% and 50% seawater treatments. The half-lives for 20% and 50% seawater treatments were prolonged by 12.1 and 39.0%, respectively, as compared to control. Microbial investigation indicated that 10% seawater treatment significantly stimulated microbial activities in the glyphosate-spiked riparian soil throughout the incubation period. At 42 day of incubation experiment, flourescein diacetate (FDA) hydrolysis rate, microbial adenosine triphosphate (ATP), and basal soil respiration (BSR) in the glyphosate-spiked riparian soil with 10% seawater were 59.2, 42.5 and 31.8% higher than those with no saltwater treatment, respectively. In contrast, saltwater treatment with 50% seawater significantly inhibited microbial activities. Especially, FDA hydrolysis rate, microbial ATP and BSR were decreased by 66.4, 58.6 and 66.8%, respectively, as compared to control. The results indicate that levels of simulated saltwater can exert variable effects on herbicide degradation dynamics and microbial parameters in the riparian soil.
开展了一项培养实验，以研究用不同比例人工海水进行模拟盐水处理对中国崇明岛河岸土壤中除草剂草甘膦降解动态及微生物活性的影响。结果表明，10%海水处理对草甘膦降解效率具有显著增强作用，在所有处理中残留浓度最低。然而，20%和50%海水处理的河岸土壤中草甘膦降解明显降低。与对照相比，20%和50%海水处理的半衰期分别延长了12.1%和39.0%。微生物调查表明，10%海水处理在整个培养期显著刺激了添加草甘膦的河岸土壤中的微生物活性。在培养实验的第42天，添加10%海水的添加草甘膦的河岸土壤中荧光素二乙酸酯（FDA）水解率、微生物三磷酸腺苷（ATP）和基础土壤呼吸（BSR）分别比未进行盐水处理的土壤高59.2%、42.5%和31.8%。相反，50%海水处理显著抑制了微生物活性。特别是，与对照相比，FDA水解率、微生物ATP和BSR分别降低了66.4%、58.6%和66.8%。结果表明，模拟盐水水平对河岸土壤中除草剂降解动态和微生物参数可产生不同影响。
