Dredging effects on selected nutrient concentrations and ecoenzymatic activity in two drainage ditch sediments in the lower Mississippi River Valley
作者机构：USDA-Agricultural Research ServiceNational Sedimentation Laboratory598 McElroy DriveOxfordMS 38655USA
出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)
年 卷 期：2017年第5卷第3期
页 面：190-195页
核心收录：
主 题：Phosphorus FDA Denitrification Mehlich III Microbial Metabolism
摘 要：Agricultural drainage ditches are conduits between production acreage and receiving aquatic *** overlooked for their mitigation capabilities,agricultural drainage ditches provide an important role for nutrient transformation via microbial *** in ecoenzyme activities have been used to elucidate microbial metabolism and resource demand of microbial communities to better understand the relationship between altered nutrient ratios and microbial activity in aquatic *** agricultural drainage ditches,one in the northeast portion of the Arkansas Delta and the other in the lower Mississippi Delta,were monitored for a *** samples were collected prior to each ditch being dredged(cleaned),and subsequent post-dredging samples occurred as soon as access was *** samples were then collected throughout a year to examine effects of dredging on selected nutrient concentrations and ecoenzymatic activity recovery in drainage ditch *** concentrations in sediments after dredging decreased 33–66%,depending on ditch and phosphorus extraction ***,ecoenzymatic activity was significantly decreased in most sediment samples after *** diacetate hydrolysis activity,an estimate of total microbial activity,decreased 56–67%after dredging in one of the two *** sample sites also had significant phosphorus and ecoenzymatic activity differences between the post-dredge samples and the year-long follow-up *** indicate microbial metabolism in dredged drainage ditches may take up to a year or more to recover to pre-dredged ***,while sediment nutrient concentrations may be decreased through dredging and removal,runoff and erosion events over time tend to quickly replenish nutrient concentrations in replaced *** nutrient dynamics and microbial metabolism within agricultural drainage ditches is a crucial step toward addressing issues of nutri
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