防除大薸和水葫芦除草剂的筛选及环境安全性评估

发布时间:2021-10-21 01:51
  Eichhornia crassipes(Mart.)Solms,also known as water hyacinth,is a perennial herb.water hyacinth originated from South America,has invaded more than 60 countries and regions in the world.It has been badly threatened to ecological environment,agriculture,livestock and health of citizen and waterway transportation.It is one of the most serious invasive aquatic plants in the world.Pistia stratiotes Linn,also called Water Lettuce,is a perennial herb,water hyacinth originated from South America-Brazi... 

【文章来源】:广西大学广西壮族自治区 211工程院校

【文章页数】:78 页

【学位级别】:硕士

【部分图文】:

防除大薸和水葫芦除草剂的筛选及环境安全性评估


图1南宁周边水葫芦和大藻的灾害情况??Figure.?1?The?disaster?situation?of?water?hyacinth?and?water?lettuce?around?Nan

消解动态,除草剂,植株,半衰期


油悬浮剂的消解最快,半衰期为6.04?d;?480?g/L灭草松消解速率很慢,在180?d??的观察期内,消解率为47.32%,半衰期为长达187.34?d,是10%硝磺草酮可分??散油悬浮剂半衰期的31.0倍(图5)。在无植株覆盖下,480?g/L灭草松水剂消解??速率较快,半衰期为49.16?d,消解速率最慢的是25%氟磺胺草醚水剂,在180?d??观察期内,消解率仅为8.7%,半衰期为1386.29?d,是480?g/L灭草松水剂半衰??期的28.2倍(图6)。此外,10%硝磺草酮可分散油悬浮剂和25%氟磺胺草醚水??剂在有无大藻和水葫芦覆盖的条件下消解速率差异较大,覆盖的条件下的半衰期??分别是无覆盖的30.2倍和55.2倍(图7-8)。??48??

消解动态,植株,除草剂,氟磺胺草醚


图8?25%氟磺胺草醚水剂在植株体有无条件下水体中的消解动态??Figure.8?Degradation?dynamics?of?25%fomesafen?aqueous?solution?in?water?with?the??plant?body?or?not??


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