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.
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
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132850
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]. Forest Ecology and Management,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.,465.
MLA	Hensley R.T.,et al."Fertilization has negligible effects on nutrient export and stream biota in two North Florida forested watersheds".465(2020).