气候变化领域集成服务门户(CCPortal): Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds

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DOI	10.1016/j.foreco.2020.118096
	Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds
	Hensley R.T.; Decker P.H.; Flinders C.; McLaughlin D.; Schilling E.; Cohen M.J.
发表日期	2020
ISSN	0378-1127
卷号	465
英文摘要	Managed pine forests cover nearly 130,000 km2 of the Southeastern U.S. and are important to the economic and ecological sustainability of the region. These stands are typically fertilized twice – at establishment and mid-rotation – to enhance timber production during a 25-year rotation. In Florida, Best Management Practices (BMPs) limit fertilizer application rates and require special management zones (SMZs) to reduce nutrient pollution. Recent adoption of numeric nutrient criteria (NNC) for streams and lakes in Florida has raised concerns that forest fertilization, even in compliance with BMPs, may result in excess nutrient loads and degrade stream ecological condition, particularly directly following fertilizer applications. We examined nutrient export dynamics and stream biota in two medium size watersheds (21 and 34 km2, respectively) dominated by loblolly pine (Pinus taeda) plantations in north Florida following fertilization. Over 54 months, we monitored stream discharge, nitrogen (TN, TKN, NO3-N, NH4-N), and phosphorus (TP, orthoP), as well as stream biota (benthic macroinvertebrates, phytoplankton chlorophyll a, periphyton and vascular plants) prior to and following watershed-scale fertilization. We condensed four years of scheduled fertilization into a single year, resulting in nutrient inputs substantially larger than typical. Because flow variation strongly controlled nutrient concentrations, we assessed pre- and post-fertilization concentration-discharge (C-Q) relationships, which remained unchanged. Annual mass export of N and P also remained unchanged, suggesting landscape retention of additional loads. Likewise, we observed no systematic change in biological indicators. These results suggest forest fertilization at BMP rates is unlikely to increase stream nutrient export, supporting the contention that fertilized pine forests in the southeastern coastal plain are protective of statewide goals for water quality and stream biotic integrity. © 2020 Elsevier B.V.
语种	英语
scopus关键词	Ecology; Fertilizers; Nutrients; Plants (botany); Water quality; Watersheds; Benthic macroinvertebrates; Best management practice (BMPs); Biological indicators; Ecological conditions; Ecological sustainability; Fertilizer applications; Nutrient concentrations; Phytoplankton chlorophyll; Forestry; chlorophyll a; coastal plain; coniferous forest; fertilizer application; forested catchment; forestry production; nutrient enrichment; phytoplankton; water quality; Ecology; Fertilization; Fertilizers; Florida; Forestry; Nutrients; Pinus Taeda; Water Quality; Florida [United States]; Pinus taeda; Tracheophyta
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155313
作者单位	University of Florida, School of Forest Resources and Conservation, Gainesville, FL, United States; National Ecological Observatory Network, Boulder, CO, United States; National Council for Air and Stream Improvement Inc., Anacortes, WA, United States; Virginia Tech, Department of Forest Resources and Environmental Conservation, Blacksburg, VA, United States; National Council for Air and Stream Improvement Inc., Aubrey, TX, United States
推荐引用方式 GB/T 7714	Hensley R.T.,Decker P.H.,Flinders C.,et al. Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds[J],2020,465.
APA	Hensley R.T.,Decker P.H.,Flinders C.,McLaughlin D.,Schilling E.,&Cohen M.J..(2020).Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds.Forest Ecology and Management,465.
MLA	Hensley R.T.,et al."Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds".Forest Ecology and Management 465(2020).