LIVIVO - Search results -

Search results

Result 1 - 10 of total 1695

Search options

Article: Nutritional Augmentation of Jeffrey Pine Saplings on a Harsh Sierran Site

Walker, Roger F

Journal of sustainable forestry. 2011 June 1, v. 30, no. 4

2011

Abstract: ... growth and enhance nutrition of a 12-yr-old Jeffrey pine (Pinus jeffreyi Grev. & Balf.) plantation ...

Abstract	Broadcast fertilization with an array of amendments was examined for its capacity to reinvigorate growth and enhance nutrition of a 12-yr-old Jeffrey pine (Pinus jeffreyi Grev. & Balf.) plantation growing on an acidic Sierra Nevada surface mine site. Selected amendments consisted of Viking Brand 21-7-14, Free Flow 29-3-4, High N 22-4-6 + Minors, and Milorganite 6-2-0 + Iron—formulations that differed substantially in critical characteristics including N sources and the duration of release, and each was administered using three rates of application. All formulations stimulated sapling growth during some stage of the study, especially when applied at the highest rates, but the Free Flow amendment, which features urea as the predominant N source, the High N formulation, which is a controlled release fertilizer, and Milorganite, an organic amendment based on municipal biosolids, sustained growth enhancement longer than the Viking amendment, which relies exclusively upon ammoniacal and nitrate N forms and lacks any provision for metering nutrient release. As indicated by foliar analysis, increased availability and uptake of N probably accounted for most of the added growth induced by fertilization, although improved P nutrition likely contributed as well. However, in addition to the N and P responses, fertilized saplings were frequently lower in Mn, B, and Al—all of which may be phytotoxic at elevated concentrations. Further support for the possible linkages between foliar concentrations noted above and sapling growth responses were provided by the concentrations of these elements in the mine soil, which was low in N and P but high in Mn, B, and Al. This study reports approaches to nutritional augmentation on degraded sites suitable for use during the sapling stage of tree development.
Keywords	Pinus jeffreyi ; aluminum ; application rate ; biosolids ; manganese ; nitrate nitrogen ; nutrition ; phytotoxicity ; saplings ; slow-release fertilizers ; soil ; urea ; Sierra Nevada (California)
Language	English
Dates of publication	2011-0601
Size	p. 263-283.
Publishing place	Taylor & Francis Group
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2010.490107
Database	NAL-Catalogue (AGRICOLA)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Article: Postplanting Nutritional Augmentation of Jeffrey Pine Seedlings on an Infertile Sierran Site

Walker, Roger F

International journal of forestry research. 2011, v. 2011

2011

Abstract: ... growth and enhance nutrition of a three-year-old Jeffrey pine (Pinus jeffreyi Grev. & Balf.) plantation ...

Institution	McIntire-Stennis Cooperative Forestry Research Program Nevada Agricultural Experiment Station
Abstract	Broadcast fertilization with an array of amendments was investigated for its capacity to stimulate growth and enhance nutrition of a three-year-old Jeffrey pine (Pinus jeffreyi Grev. & Balf.) plantation growing on an acidic Sierra Nevada surface mine. Four formulations that differed in N source, duration of release, and the suite of nutrients provided were evaluated, with each applied using four rates. Free Flow 29-3-4, a conventional amendment featuring urea as its near exclusive N source, and High N 22-4-6, a controlled release formulation containing ammoniacal, nitrate, and urea N, were the most stimulatory while an organic formulation relying exclusively on a municipal biosolid N source, Milorganite 6-2-0, was the least so. The lowest application rates employed were inadequate while the most advantageous was not the highest rate for any formulation. Foliar analysis revealed that improved N nutrition was probably critical in the favorable growth responses to fertilization, that of P was a likely contributor, and amelioration of potential Mn toxicity may have assumed an accessory role.
Keywords	application rate ; leaf analysis ; manganese ; mountains ; nitrates ; nutrients ; nutrition ; Pinus jeffreyi ; seedlings ; toxicity ; urea ; urea nitrogen
Language	English
Size	p. .
Publishing place	Hindawi Pub. Corp.
Document type	Article
ZDB-ID	2487115-1
ISSN	1687-9376 ; 1687-9368
ISSN (online)	1687-9376
ISSN	1687-9368
DOI	10.1155%2F2011%2F980670
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Postplanting Nutritional Augmentation of Jeffrey Pine Seedlings on an Infertile Sierran Site

Roger F. Walker

International Journal of Forestry Research, Vol

2011 Volume 2011

Keywords	Forestry ; SD1-669.5 ; Agriculture ; S ; DOAJ:Forestry ; DOAJ:Agriculture and Food Sciences
Language	English
Publishing date	2011-01-01T00:00:00Z
Publisher	Hindawi Publishing Corporation
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Bark Beetle Demography in a Jeffrey Pine Stand as Influenced by Mechanized Thinning and Prescribed Fire

Walker, Roger F / Swim, Shannon L / Johnson, Dale W / Miller, Watkins W / Fecko, Robert M

Journal of sustainable forestry. 2014 Oct. 3, v. 33, no. 7

2014

Abstract: ... by underburning were evaluated for their effects on bark beetle prevalence in pure, uneven-aged Jeffrey pine ... component, the Jeffrey pine beetle (Dendroctonus jeffreyi Hopkins) generally preferred larger trees ... on white fir far exceeded that on Jeffrey pine, and the greatest influence on the fir engraver ...

Abstract	Forest thinnings implemented with cut-to-length and whole-tree harvesting systems followed by underburning were evaluated for their effects on bark beetle prevalence in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) interspersed with isolated California white fir (Abies concolor var. lowiana [Gord.] Lemm.). Based on pitch tube counts in a stand with a moderate bark beetle population in its pine component, the Jeffrey pine beetle (Dendroctonus jeffreyi Hopkins) generally preferred larger trees before treatment implementation, but after exhibiting mixed pretreatment tendencies concerning stand density demonstrated a posttreatment proclivity toward higher density. Cut-to-length thinning followed by underburning increased the pine beetle population while whole-tree thinning unaccompanied by burning reduced it. Tree mortality was induced by the bark beetle infestation but was not its sole cause. Pitch tube abundance on white fir far exceeded that on Jeffrey pine, and the greatest influence on the fir engraver (Scolytus ventralis LeConte) population was the prevalence of its host tree. The responses presented herein to these thinning and burning practices, which are being increasingly utilized in forest restoration efforts in the western USA, provide natural resource managers insight into potential forest health outcomes when implemented in Jeffrey pine and similar dry site forest types.
Keywords	Abies concolor ; Dendroctonus jeffreyi ; Pinus jeffreyi ; Scolytus ventralis ; bark beetles ; demography ; forest health ; forest restoration ; forest types ; managers ; mechanization ; prescribed burning ; stand density ; sustainable forestry ; tree mortality ; trees ; whole tree harvesting ; California
Language	English
Dates of publication	2014-1003
Size	p. 627-676.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2014.925401
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Influences of Thinning and Underburning Restoration Practices on Red Turpentine Beetle Demography in Jeffrey Pine

Walker, Roger F / Swim, Shannon L / Fecko, Robert M / Johnson, Dale W / Miller, Watkins W

Journal of sustainable forestry. 2014 Oct. 3, v. 33, no. 7

2014

Abstract: ... LeConte) colonization in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.). Based on pitch ... over the intermediate term when implemented in Jeffrey pine and similar dry site forest types. ...

Abstract	Forest thinnings implemented with cut-to-length and whole-tree harvesting systems followed by prescribed underburning were evaluated for their effects on red turpentine beetle (Dendroctonus valens LeConte) colonization in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.). Based on pitch tube abundance expressed as bole surface area-based counts, this beetle was significantly more prevalent where thinnings were implemented regardless of harvesting approach than in the unthinned treatment, but the population increases were confined to the burned stand portions. Substantial evidence indicated that fire-induced crown and bole damage culminating in compromised defense mechanisms elevated turpentine beetle colonization, and some evidence suggested a proclivity of this beetle to attack stems exhibiting general characteristics of low vigor, specifically smaller trees with weak crowns. Tree mortality was likely induced by the turpentine beetle infestation but was probably not its sole cause. The responses presented herein to these thinning and burning practices, which are being increasingly relied upon in forest restoration efforts in the western USA, provide natural resource managers insight into potentially compromised forest health outcomes over the intermediate term when implemented in Jeffrey pine and similar dry site forest types.
Keywords	Dendroctonus valens ; Pinus jeffreyi ; burning ; defense mechanisms ; demography ; forest health ; forest restoration ; forest types ; harvesting ; managers ; population growth ; stems ; sustainable forestry ; tree mortality ; tree trunk ; trees ; turpentine ; vigor ; whole tree harvesting ; Western United States
Language	English
Dates of publication	2014-1003
Size	p. 677-727.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2014.925403
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Evaluation of Mechanized Thinning and Prescribed Fire Effects on Long-Term Fuels Accumulations in Uneven-Aged Jeffrey Pine

Swim, Shannon L / Walker, Roger F / Johnson, Dale W / Fecko, Robert M / Miller, Watkins W

Journal of sustainable forestry. 2014 Nov. 17, v. 33, no. 8

2014

Abstract: ... aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) accompanied by isolated California white fir ...

Abstract	Forest thinnings implemented through cut-to-length and whole-tree harvesting followed by underburning were evaluated for their effects on long-term downed and dead fuels accumulations in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) accompanied by isolated California white fir (Abies concolor var. lowiana [Gord.] Lemm.). Based on an initial inventory consisting of dry weight and fuel bed depth measurements conducted posttreatment, accumulations in the cut-to-length treatment were elevated according to most measures. Burned stand portions exhibited smaller quantities of fuels initially in individual timelag categories and in total as well as reduced fuel bed depths compared to their unburned counterparts except for the 1,000-hr fuels in the whole-tree treatment where postburn mortality of small stems nullified this effect. A linkage between initial mortality resulting from prescribed fire and final 1,000-hr fuels, as measured 8 yr later, was established but was probably attributable to combined thinning and burning effects. Over the course of the study, either greater accruals or diminished reductions in loading were apparent within burned stand portions compared to unburned portions, most notably in the whole-tree treatment. Results presented here provide insight into potentially compromised fuels reduction outcomes when implemented in uneven-aged stands on dry forest sites.
Keywords	Abies concolor ; Pinus jeffreyi ; forests ; fuels ; inventories ; long term effects ; mechanization ; mortality ; prescribed burning ; stems ; sustainable forestry ; uneven-aged stands ; whole tree harvesting ; California
Language	English
Dates of publication	2014-1117
Size	p. 827-859.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2014.966919
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Long-Term Growth Responses of a Jeffrey Pine Stand to Mechanized Thinning and Prescribed Fire

Swim, Shannon L / Walker, Roger F / Johnson, Dale W / Fecko, Robert M / Miller, Watkins W

Journal of sustainable forestry. 2013 Nov. 17, v. 32, no. 8

2013

Abstract: ... uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) accompanied by isolated California white fir ... when implemented in Jeffrey pine and similar dry site forest types. ...

Abstract	Forest thinnings implemented with cut-to-length and whole-tree harvesting systems followed by underburning were evaluated for their effects on individual tree and stand level growth responses in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) accompanied by isolated California white fir (Abies concolor var. lowiana [Gord.] Lemm.). Based on both dimension and volume measures, trees of the unburned whole-tree treatment combination exhibited the greatest individual growth responses. At the stand level, a diminished volume growth response in the whole-tree treatment was especially pronounced in the burned portion, mostly attributable to exaggerated stocking losses, while a superior response in the unburned cut-to-length combination likely reflected not only the absence of detrimental fire impacts but also benefits of on-site slash retention. For stand level biomass, diminished growth in the whole-tree treatment was again evident, with that in the burned portion again most pronounced, while biomass accrual in the unburned cut-to-length treatment combination was generally comparable to that in the unthinned control. Increasingly utilized in forest restoration efforts in the western USA, the responses presented herein to these thinning and burning practices provide natural resource managers insight into potential compromised outcomes when implemented in Jeffrey pine and similar dry site forest types.
Keywords	Abies concolor ; Pinus jeffreyi ; biomass ; forest restoration ; forest types ; harvesting ; mechanization ; prescribed burning ; slash ; trees ; whole tree harvesting ; United States
Language	English
Dates of publication	2013-1117
Size	p. 745-782.
Publishing place	Taylor & Francis
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2013.791232
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Influences of mechanized thinning and prescribed underburning on radial growth of Jeffrey pine

Fecko, R.M / Walker, R.F / Frederick, W.B / Johnson, D.W / Miller, W.W

Journal of sustainable forestry. 2008, v. 26, no. 1

2008

Keywords	Pinus jeffreyi ; tree growth ; forest thinning ; prescribed burning ; growth rings ; stand density ; stand management ; forest yields ; dry environmental conditions ; forest trees ; tree and stand measurements ; latewood ; earlywood
Language	English
Size	p. 19-60.
Document type	Article
ZDB-ID	1160736-1
ISSN	1054-9811
ISSN	1054-9811
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 5716: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Influences of Mechanized Thinning and Prescribed Fire on Natural Regeneration in an Uneven-Aged Jeffrey Pine Stand

Salverson, Wade G / Walker, Roger F / Fecko, Robert M / Frederick, Wesley B / Miller, Watkins W / Johnson, Dale W

Journal of sustainable forestry. 2011 Nov. 1, v. 30, no. 7

2011

Abstract: ... evaluated for their effects on seedling and sapling demography in a pure, uneven-aged Jeffrey pine ... with thinning was followed by a recovery largely confined to Jeffrey pine in the whole-tree treatment ... for establishment of Jeffrey pine than white fir seedlings, and the largest increase in seedling counts between ...

Abstract	Thinnings using cut-to-length or whole-tree harvesting systems followed by underburning were evaluated for their effects on seedling and sapling demography in a pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) stand containing a minor component of California white fir (Abies concolor var. lowiana [Gord.] Lemm.). Depression of seedling counts due to forest floor disturbance associated with thinning was followed by a recovery largely confined to Jeffrey pine in the whole-tree treatment where final seedling counts exceeded those found initially. The postburn substrate was more favorable for establishment of Jeffrey pine than white fir seedlings, and the largest increase in seedling counts between the initial and final inventories occurred in the burned portion of the whole-tree treatment. Live sapling losses from thinning were greatest in the cut-to-length treatment, while underburning induced complete sapling mortality. Absent treatment, several stand and site variables influenced seedling and sapling abundance, prominent among them a propensity for mahala mat (Ceanothus prostratus Benth.) to elevate counts of white fir within both size classes. These results provide land managers insight into the impacts of six combinations of thinning and burning treatment on natural regeneration in eastern Sierra Nevada Jeffrey pine and similar dry site forest types.
Keywords	Abies concolor ; Ceanothus ; Pinus jeffreyi ; demography ; forest litter ; forest types ; harvesting ; managers ; mechanization ; mortality ; natural regeneration ; prescribed burning ; seedlings ; California ; Sierra Nevada (California)
Language	English
Dates of publication	2011-1101
Size	p. 654-676.
Publishing place	Taylor & Francis Group
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2011.567937
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Influences of Mechanized Thinning and Prescribed Fire on Understory Vegetation in an Uneven-Aged Jeffrey Pine Stand

Salverson, Wade G / Walker, Roger F / Fecko, Robert M / Frederick, Wesley B / Johnson, Dale W / Miller, Watkins W

Journal of sustainable forestry. 2011 Dec. 1, v. 30, no. 8

2011

Abstract: ... were assessed for their effects on shrub, forb, and grass understory species in a second-growth Jeffrey ...

Abstract	Thinnings using cut-to-length and whole-tree harvesting systems followed by prescribed underburning were assessed for their effects on shrub, forb, and grass understory species in a second-growth Jeffrey pine (Pinus jeffreyi Grev. & Balf.) stand. Prior to treatment installation, a mixed shrub-dominated understory featuring antelope bitterbrush (Purshia tridentata [Pursh] DC.) with mules ears (Wyethia mollis A. Gray) as the only forb and Sandberg bluegrass (Poa secunda J. Presl) the most prominent among sparse grasses was inventoried such that both percent cover and dry weight by species were revealed. Five growing seasons after thinning and four after underburning, this inventory was repeated. By either abundance measure, bitterbrush was reduced by approximately two-thirds in the cut-to-length treatment and by one-half in the whole-tree treatment in comparison to that in the unthinned control at the final inventory. For the cut-to-length treatment, a similar reduction in mules ears was noted, but that in the whole-tree treatment was somewhat less for this species. Bluegrass was reduced by approximately one-half in the former treatment and by threefourths in the latter. Prescription fire reduced bitterbrush to less than one-tenth and mules ears to approximately one-half of that in the unburned treatment, but bluegrass prevalence was more than 10× greater in the burned than in the unburned treatment. Among an array of regression models used to evaluate selected variables for their predictive capacity regarding understory plants, abundance of each species noted above among others was negatively correlated with overstory density across treatments.
Keywords	Pinus jeffreyi ; Poa secunda ; Purshia tridentata ; Wyethia ; correlation ; forbs ; grasses ; growing season ; harvesting ; mechanization ; overstory ; prescribed burning ; regression analysis ; second growth ; shrubs ; understory ; vegetation
Language	English
Dates of publication	2011-1201
Size	p. 823-849.
Publishing place	Taylor & Francis Group
Document type	Article
ZDB-ID	2094282-5
ISSN	1540-756X ; 1054-9811
ISSN (online)	1540-756X
ISSN	1054-9811
DOI	10.1080/10549811.2011.577401
Database	NAL-Catalogue (AGRICOLA)

Order via subito

To top

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito