Treesearch - scientific articles written or published by the U.S. Forest Service

Show/Hide Search Form

Keywords (All fields) or Title:

Last Name of Author:

Date Range:

FS Series:

Subscribe to R&D Publications recently added to Treesearch - RSS feed More RSS options

Displaying 1 - 20 of 42

Pages

Records Per Page:

Sort By:

The effects of global positioning system receiver accuracy on airborne laser scanning-assisted estimates of aboveground biomass

National forest inventories routinely report estimates of parameters related to aboveground biomass (AGB), but sample sizes are often insufficient to satisfy precision guidelines and reporting requirements. Aerial photography, satellite imagery, and increasingly airborne laser scanning (ALS) data are all used as sources of auxiliary information to address this...

https://www.fs.usda.gov/treesearch/search?keywords=%22estimation%22&%3Bamp%3Bf%5B0%5D=author_facet%3A%22Kelsey%2C%20Rick%22&%3Bf%5B0%5D=author_facet%3A%22Schweitzer%2C%20Callie%22&f%5B0%5D=author_facet%3A%22Moran%2C%20Matt%22&f%5B1%5D=author_facet%3A%22Trimble%2C%20Steven%22&f%5B2%5D=author_facet%3A%22Fox%2C%20Timothy%22&f%5B3%5D=author_facet%3A%22Kaisershot%2C%20Daniel%22&f%5B4%5D=author_facet%3A%22Ramos%2C%20Olga%22&f%5B5%5D=author_facet%3A%22Johnsen%2C%20Kurt%22

Author(s):

Ronald E. McRoberts; Qi Chen; Brian F. Walters; Daniel J. Kaisershot

Year:

2018

Keywords:

Model-assisted estimator, Forest inventory

Source:

Remote Sensing of Environment

Monthly leaf area index estimates from point-in-time measurements and needle phenology for Pinus taeda

Abstract: Leaf area index (LAI) of loblolly pine (Pinus taeda L.) trees of the southern United States varies almost twofold interannually; loblolly pine, essentially, carries two foliage cohorts at peak LAI (September) and one at minimum (March?April). Herein, we present an approach that may be site invariant to estimate monthly...

Author(s):

D.A. Sampson; T.J. Albaugh; Kurt H. Johnsen; H.L. Allen; Stanley J. Zarnoch

Year:

2003

Keywords:

Source:

Can. J. For. Res. 33: 2477–2490

GPP in Loblolly Pine: A Monthly Comparison of Empirical and Process Models

Monthly and yearly gross primary productivity (GPP) estimates derived from an empirical and two process based models (3PG and BIOMASS) were compared. Spatial and temporal variation in foliar gas photosynthesis was examined and used to develop GPP prediction models for fertilized nine-year-old loblolly pine (Pinus taeda) stands located in the North...

Author(s):

Christopher Gough; John Seiler; Kurt Johnsen; David Arthur Sampson

Year:

2002

Keywords:

Source:

Gen. Tech. Rep. SRS–48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 66-71

Estimating maximum mean canopy stomatal conductance for use in models

Fertilized (F) and irrigated and fertilized (IF) stands of Pinus taeda L. produced twice the leaf area index of irrigated (I) and control (C) stands. Based on sap flux-scaled mean stomatal conductance (G_S), we found that stomatal conductance in F was half that in other treatments. During the growing season, GS was related to...

Author(s):

Brent E. Ewers; Ram Oren; Kurt H. Johnsen; J.J Landsberg

Year:

2001

Keywords:

Source:

Can. J. For. Res. 31: 198207 (2001)

Soil properties differently influence estimates of soil CO₂ efflux from three chamber-based measurement systems

Soil C0₂ efflux is a major component of net ecosystem productivity (NEP) of forest systems. Combining data from multiple researchers for larger-scale modeling and assessment will only be valid if their methodologies provide directly comparable results. We conducted a series of laboratory and field tests to assess the presence and magnitude of...

Author(s):

John R. Butnor; Kurt H. Johnsen; Chris A. Maier

Year:

2005

Keywords:

Calibration, CO2 efflux, diffusivity, porosity, soil CO2 efflux, soil respiration

Source:

Biogeochemistry 73: 283-301

Surface-based GPR underestimates below-stump root biomass

Aims While lateral root mass is readily detectable with ground penetrating radar (GPR), the roots beneath a tree (below-stump) and overlapping lateral roots near large trees are problematic for surface-based antennas operated in reflection mode. We sought to determine if tree size (DBH) effects GPR root detection proximal to longleaf pine (Pinus palustris Mill) and if...

Author(s):

John R. Butnor; Lisa J. Samuelson; Thomas A. Stokes; Kurt H. Johnsen; Peter H. Anderson; Carlos A. Gonzalez-Benecke

Year:

2016

Keywords:

GPR . Root mass, taproot . Lateral root . Below-stump . Pinus palustris . Longleaf pine

Source:

Plant and Soil

Utility of Ground-Penetrating Radar as a Root Biomass Survey Tool in Forest Systems

Traditional methods of measuring tree root biomass are labor intensive and destructive in nature. We studied the utility of ground-penetrating radar (GPR) to measure tree root biomass in situ within a replicated, intensive culture forestry experiment planted with loblolly pine (Pinus taeda L.). The study site was located in Decatur County, Georgia,...

Author(s):

John R. Butnor; J.A. Doolittle; Kurt H. Johnsen; L. Samuelson; T. Stokes; L. Kress

Year:

2003

Keywords:

Source:

Soil Science Society of America Journal 67:1607–1615

Carbon Sequestration in loblolly pine plantations: Methods, limitations, and research needs for estimating storage pools

Globally, the species most widely used for plantation forestry is loblolly pine (Pinus taeda L.). Because loblolly pine plantations are so extensive and grow so rapidly, they provide a great potential for sequestering atmospheric carbon (C). Because loblolly pine plantations are relatively simple ecosystems and because such a great volume of...

Author(s):

Kurt Johnsen; Bob Teskey; Lisa Samuelson; John Butnor; David Sampson; Felipe Sanchez; Chris Maier; Steve McKeand

Year:

2004

Keywords:

Source:

In: Gen. Tech. Rep. SRS–75. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. Chapter 32. p. 373-381.

Stand-scale correspondence in empirical and simulated labile carbohydrates in loblolly pine

As investment into intensive forestry increases, the potential trade-offs between productivity and sustainability should be scrutinized. Because of their important role in internal carbon (C) budgets, labile C pools may provide a measure of the potential ability of trees and stands to respond to stress. We modified the process model BIOMASS to...

Author(s):

David A. Sampson; Kurt H. Johnsen; Kim H. Ludovici; Timothy J. Albaugh; Chris A. Maier

Year:

2001

Keywords:

Source:

Forest Science. 47(1): 60-68

Estimating effects of reforestation on nitrogen and phosphorus load reductions in the Lower Yazoo River Watershed, Mississippi

Surface water quality in the Lower Mississippi River Basin (LMRB) and the adjacent Gulf of Mexico has degraded over the past several decades primarily due to deforestation to agricultural lands and the loss of wetlands. This study investigated the benefits of reforestation upon nitrate?nitrogen (NO-₃---N) and orthophosphate (PO^3-

Author(s):

Ying Ouyang; Theodor D. Leininger; Matt Moran

Year:

2015

Keywords:

HSPF model, Nitrate and orthophosphate load, Reforestation, Yazoo River Watershed

Source:

Ecological Engineering, 75:449-456.

Site index comparisons for forest species in the Upper Great Lakes area of the United States and Canada

This report summarizes six studies that compare site index relations between 24 hardwood and conifer species in the Upper Great Lakes area of the United States and Canada. These six studies have many regression models and graphs for comparing site index between forest species thus providing tools for estimating site index for alternative tree species based on direct...

Author(s):

Willard H. Carmean; Jerold T. Hahn; Ronald E. McRoberts; D. Kaisershot

Year:

2013

Keywords:

height growth, predicting most productive tree species

Source:

Gen. Tech. Rep. NRS-113. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 39 p.

Use of ground-penetrating radar to study tree roots in the southeastern United States

Summary: The objectives of our study were to assess the feasibility of using ground-penetrating radar (GPR) to study roots over a broad range of soil conditions in the southeastern United States. Study sites were located in the Southern Piedmont, Carolina Sandhills and Atlantic Coast Flatwoods. At each site, we tested for selection of the appropriate...

Author(s):

John R. Butnor; J.A. Doolittle; L. Kress; Susan Cohen; Kurt H. Johnsen

Year:

2001

Keywords:

GPR, map roots, noninvasive, radar antenna, radar profile, reflector, root biomass, root biomass assessment, root biomass sampling, root detection

Source:

Tree Physiology 21, 1269?1278. Heron Publishing - Victoria, Canada

Contrasting responses to drought of forest floor CO₂ efflux in a loblolly pine plantation and a nearby Oak-Hickory forest

Forest floor C0₂ efflux (F_ff) depends on vegetation type, climate, and soil physical properties. We assessed the effects of biological factors on F_ff by comparing a maturing pine plantation (PP) and a nearby mature Oak-Hickory-type hardwood forest (HW). F_ff was measured...

Author(s):

S. Palmroth; Chris A. Maier; Heather R. McCarthy; A. C. Oishi; H. S. Kim; Kurt H. Johnsen; Gabrial G. Katul; Ram Oren

Year:

2005

Keywords:

belowground carbon allocation, chamber conifer, hardwood, IRGA, litterfall, Pinus taeda L., Quercus ssp., soil respiration, temperate

Source:

Global Change Biology 11: 421-434

North Dakota's Forests 2010

The second annual inventory of North Dakota's forests reports more than 772,000 acres of forest land with an average volume of more than 921 cubic feet per acre. Forest land is dominated by the bur oak forest type, which occupies more than a third of the total forest land area. The poletimber stand-size class represents 39 percent of forest land, followed by...

Author(s):

David E. Haugen; Robert Harsel; Aaron Bergdahl; Tom Claeys; Christopher W. Woodall; Barry T. Wilson; Susan J. Crocker; Brett J. Butler; Cassandra M. Kurtz; Mark A. Hatfield; Charles H. Barnett; Grant Domke; Dan Kaisershot; W. Keith Moser; Andrew J. Lister; Dale D. Gormanson

Year:

2013

Keywords:

inventory, forest statistics, forest land, volume, biomass, carbon, growth, removals, mortality, forest health

Source:

Resour. Bull. NRS-76. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 52 p.

Trenching reduces soil heterotrophic activity in a loblolly pine (Pinus taeda) forest exposed to elevated atmospheric [CO2] and N fertilization

Forests return large quantities of C to the atmosphere through soil respiration (Rsoil), which is often conceptually separated into autotrophic C respired by living roots (Rroot) and heterotrophic decomposition (Rhet) of soil organic matter (SOM). Live roots provide C sources for microbial metabolism via exudation, allocation to fungal associates, sloughed-off cells,...

Author(s):

J.E. Drake; A.C. Oishi; M. A. Giasson; R. Oren; Kurt Johnsen; A.C. Finzi

Year:

2012

Keywords:

Elevated carbon dioxide, Nitrogen fertilization, Trenching, Priming, Root respiration, Heterotrophic respiration

Source:

Agriculture and Forest Meteorology

Modeling the effects of forest management on in situ and ex situ longleaf pine forest carbon stocks

Assessment of forest carbon storage dynamics requires a variety of techniques including simulation models. We developed a hybrid model to assess the effects of silvicultural management systems on carbon (C) budgets in longleaf pine (Pinus palustris Mill.) plantations in the southeastern U.S. To simulate in situ C pools, the model integrates a growth and yield model...

Author(s):

C.A. Gonzalez-Benecke; L.J. Samuelson; T.A. Martin; W.P. Cropper Jr; Kurt Johnsen; T.A. Stokes; John Butnor; P.H. Anderson

Year:

2015

Keywords:

Pinus palustris plantations, Silviculture, Biomass, Prescribed Burning, Carbon Stock Modeling

Source:

Forest Ecology and Management

Estimating impact of rainfall change on hydrological processes in Jianfengling rainforest watershed, China using BASINS-HSPF-CAT modeling system

Climate change over the past several decades has resulted in shifting rainfall pattern and modifying rain-fall intensity, which has exacerbated hydrological processes and added the uncertainty and instability tothese processes. This study ascertained impacts of potential future rainfall change on hydrological pro-cesses at the Jianfengling (JFL) tropical mountain...

Author(s):

Zhang Zhou; Ying Ouyang; Yide Li; Zhijun Qiu; Matt Moran

Year:

2017

Keywords:

Climate change, Hydrology, Jianfengling, Modeling, Rainfall change, Rainforest

Source:

Ecological Engineering

North Dakota's forests 2005

The first completed annual inventory of North Dakota's forests reports estimates of more than 724,000 acres of forest land. Information about forest attributes and forest health is presented along with information on agents of change including changing land use patterns and the introduction of nonnative plants, insects, and disease.

Author(s):

David E. Haugen; Michael Kangas; Susan J. Crocker; Charles H. Perry; Christopher W. Woodall; Brett J. Butler; Barry T. Wilson; Dan J. Kaisershot

Year:

2009

Keywords:

inventory, forest statistics, forest health

Source:

Resour. Bull. NRS-31. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 82 p.

Republic of the Marshall Islands' forest resources, 2008

The Forest Inventory and Analysis program collected, analyzed, and summarized field data on 44 forested field plots for the 10 largest atoll groups in the Republic of the Marshall Islands (RMI): Ailinglaplap, Arno, Jaluit, Kwajalein, Likiep, Majuro, Maloelap, Mili, Rongelap, and Wotje. Estimates of forest area, tree stem volume and biomass, the numbers of trees, tree...

Author(s):

Joseph A. Donnegan; Steven T. Trimble; Karness Kusto; Olaf Kuegler; Bruce A. Hiserote

Year:

2011

Keywords:

RMI, Ailinglaplap, Arno, Jaluit, Kwajalein, Likiep, Majuro, Maloelap, Mili, Rongelap, Wotje, biomass, damage, Forest Inventory and Analysis (FIA), forest inventory, volume, land cover.

Source:

Resour. Bull. PNW-RB-263. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 29 p.

Modelling moose-forest interactions under different predation scenarios at Isle Royale National Park, USA

Loss of top predators may contribute to high ungulate population densities and chronic over-browsing of forest ecosystems. However, spatial and temporal variability in the strength of interactions between predators and ungulates occurs over scales that are much shorter than the scales over which forest communities change, making it difficult to characterize trophic...

Author(s):

Nathan R. De Jager; Jason J. Rohweder; Brian R. Miranda; Brian R. Sturtevant; Timothy J. Fox; Mark C. Romanski

Year:

2017

Keywords:

disturbance, forest simulation model, herbivory, Isle Royale National Park, LANDIS-II, predator management, trophic cascade

Source:

Ecological Applications

Pages

Total Publications in Treesearch: 53,230

Show/Hide Search Form

Pages

The effects of global positioning system receiver accuracy on airborne laser scanning-assisted estimates of aboveground biomass

Monthly leaf area index estimates from point-in-time measurements and needle phenology for Pinus taeda

GPP in Loblolly Pine: A Monthly Comparison of Empirical and Process Models

Estimating maximum mean canopy stomatal conductance for use in models

Soil properties differently influence estimates of soil CO₂ efflux from three chamber-based measurement systems

Surface-based GPR underestimates below-stump root biomass

Utility of Ground-Penetrating Radar as a Root Biomass Survey Tool in Forest Systems

Carbon Sequestration in loblolly pine plantations: Methods, limitations, and research needs for estimating storage pools

Stand-scale correspondence in empirical and simulated labile carbohydrates in loblolly pine

Estimating effects of reforestation on nitrogen and phosphorus load reductions in the Lower Yazoo River Watershed, Mississippi

Site index comparisons for forest species in the Upper Great Lakes area of the United States and Canada

Use of ground-penetrating radar to study tree roots in the southeastern United States

Contrasting responses to drought of forest floor CO₂ efflux in a loblolly pine plantation and a nearby Oak-Hickory forest

North Dakota's Forests 2010

Trenching reduces soil heterotrophic activity in a loblolly pine (Pinus taeda) forest exposed to elevated atmospheric [CO2] and N fertilization

Modeling the effects of forest management on in situ and ex situ longleaf pine forest carbon stocks

Estimating impact of rainfall change on hydrological processes in Jianfengling rainforest watershed, China using BASINS-HSPF-CAT modeling system

North Dakota's forests 2005

Republic of the Marshall Islands' forest resources, 2008

Modelling moose-forest interactions under different predation scenarios at Isle Royale National Park, USA

Pages

Chief Financial Officer

Office of the Chief

Business Operations

National Forest System

Research and Development

State and Private Forestry