气候变化领域集成服务门户(CCPortal): Characterizing bioavailable phosphorus concentrations in an agricultural stream during hydrologic and streambed disturbances

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DOI	10.1007/s10533-021-00803-w
	Characterizing bioavailable phosphorus concentrations in an agricultural stream during hydrologic and streambed disturbances
	Trentman M.T.; Tank J.L.; Shepherd H.A.M.; Marrs A.J.; Welsh J.R.; Goodson H.V.
发表日期	2021
ISSN	1682563
起始页码	509
结束页码	524
卷号	154 期号:3
英文摘要	In freshwater ecosystems, phosphorus (P) is often considered a growth-limiting nutrient. The use of fertilizers on agricultural fields has led to runoff-driven increases in P availability in streams, and the subsequent eutrophication of downstream ecosystems. Isolated storms and periodic streambed dredging are examples of two common disturbances that contribute dissolved and particulate P to agricultural streams, which can be quantified as soluble reactive P (SRP) using the molybdate-blue method on filtered water samples, or total P (TP) measured using digestions on unfiltered water reflecting all forms of P. While SRP is often considered an approximation of bioavailable P (BAP), research has shown that this is not always the case. Current methods used to estimate BAP do not account for the role of biology (e.g., NaOH extractions) or require specialized platforms (e.g., algal bioassays). Here, in addition to routine analysis of SRP and TP, we used a novel yeast-based bioassay with unfiltered sample water to estimate BAP concentrations during two storms (top 80% and > 95% flow quantiles), and downstream of a reach where management-associated dredging disturbed the streambed. We found that the BAP concentrations were often greater than SRP, suggesting that SRP is not fully representative of P bioavailability. The SRP concentrations were similarly elevated during the two storms, but remained consistently low during streambed disturbance. In contrast, turbidity and TP were elevated during all events. The BAP concentrations were significantly related to turbidity during all disturbance events, but with TP only during storms. The novel yeast assay suggests that BAP export can exceed SRP, particularly when streams are not in equilibrium, such as the rising limb of storms or during active dredging. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Agriculture; Bioavailable phosphorus; Phosphorus; Storms; Streambed disturbance; Yeast
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184585
作者单位	Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, United States; Environmental Change Initiative, University of Notre Dame, Notre Dame, IN 46556, United States; Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States; University of Montana-Flathead Lake Biological Station, Polson, MT 59860, United States
推荐引用方式 GB/T 7714	Trentman M.T.,Tank J.L.,Shepherd H.A.M.,et al. Characterizing bioavailable phosphorus concentrations in an agricultural stream during hydrologic and streambed disturbances[J],2021,154(3).
APA	Trentman M.T.,Tank J.L.,Shepherd H.A.M.,Marrs A.J.,Welsh J.R.,&Goodson H.V..(2021).Characterizing bioavailable phosphorus concentrations in an agricultural stream during hydrologic and streambed disturbances.Biogeochemistry,154(3).
MLA	Trentman M.T.,et al."Characterizing bioavailable phosphorus concentrations in an agricultural stream during hydrologic and streambed disturbances".Biogeochemistry 154.3(2021).