Pinyon-Juniper Litter Reduces Growth of Blue Grama

Jameson, Donald A.

doi:10.2307/3895650

Cited by 39 publications

(25 citation statements)

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“…Reduced light intensity can be inferred from the reduced canopy height and higher canopy closure of positions under the canopy than for those positions near the edge of the canopy. These observations agree with earlier studies Jameson 1966Jameson , 1970 which indicated the detrimental effects of juniper litter on blue grama. Pinyon ricegrass Limited work has been done on vegetational patterns around the pinyons (Pinus edulis and~ monophylla).…”

Section: Patterns Around Individual Treessupporting

confidence: 93%

“…The mechanism of tree control over herbage production has been assumed to be soil moisture, physical and chemical effects of needle litter, light reduction, or a combination of these factors (Jameson 1966;Pieper 1983;Schott and Pieper 1985), Redistribution of available nutrients from interspaces between trees to enriched locations under the tree crowns has also been proposed as an herbage reduction mechanism Sharrow 1983, 1985).…”

Section: Discussionmentioning

confidence: 99%

“…Woodland expansion since the time of settlement has been attributed to several factors, including control of fires, reduced grass competition because of livestock grazing, and possible climatic changes. It has also been suggested that tree expansion may be related to reduced competition from understory vegetation resulting from the allelopathic influence of tree litter (Jameson 1970a(Jameson , 1966, and to increased populations of seed-dispersing birds and mammals (Salomonson 1978;Wander Wall and Balds 1977).…”

Section: Structurementioning

confidence: 99%

“…Although several factors, including shade, rainfall interception, tree litter, and phytotoxic root exudates, can account for reduced undergrowth production under tree canopies (Jameson 1970b(Jameson , 1966, competition for soil moisture also appears to be an important consideration (Jeppesen 1978;Gifford and Shaw 1973;). An individual tree exerts an influence on the undergrowth composition and growth even beyond its canopy.…”

Section: Undergrowth Productivitymentioning

confidence: 99%

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Proceedings - pinyon-juniper conference; 1986 January 13-16; Reno, NV

Everett¹

1987

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FOREWORDThe Pinyon and Juniper Woodland Formation occurs over large acreages from Mexico to Canada and from California to Texas. The vegetation type is poorly understood, inadequately defined, and often misused. Significant management problems are identifying and classifying woodland sites, understanding woodland ecology, and proper management for sustained resource productivity. Land managers and scientists alike recognized the need to improve our understanding of woodlands and their management.An interagency steering committee was formed to develop a state-of-the-art management guide for woodlands. The approach selected was to hold a West-wide pinyon and juniper conference to gather the required information, develop a management guide from the conference papers, and hold field workshops utilizing the management guide. To that end, this conference proceedings brings together current research and management perspectives on pinyon and juniper woodlands. Session topics were selected by the steering committee to provide the required scientific and management base for practical and ecologically sound management guidelines. Session chairmen selected by the committee solicited the speakers for their own sessions as they saw fit. The success of the conference was largely due to the efforts of the session chairmen and their invited speakers.This proceedings provides information on woodland paleobotany, inventory and classification, synecology, silvics and silviculture, fire response, economics, plant-water relations, woodland conversion, range management, wildlife, woodland hydrology, and nutrient cycling. Paleobotany papers provide us with a perspective of where we are now in relation to the previous natural expansion, contraction, and movement of the Pinyon and Juniper Woodland Formation independent of human influence. Several general session papers allow us to evaluate the current human role in the woodland ecosystem. Inventory and classification provide a reference point to evaluate the current extent of the resource and its varying productivity potentials. Papers on synecology, fire response, and silvics provide insight into woodland successional processes and stand development, Woodland conversion, wildlife, range management, silviculture, and economic papers evaluate management alternatives and the required inputs for utilizing and maintaining wood and forage resources. The nutrient cycling papers define biotic and abiotic nutrient pools and the cycling processes in natural and disturbed systems. Woodland hydrology and plant-water relation papers discuss hydrologic models, water harvesting, the erosion process, and water use by trees and competing species.Much information was provided by the conference. Difficult questions were asked by Native Americans about current overuse of woodland resources. Our own watchdog scientists asked us to be careful to separate fact from fable in the scientific literature.A well-deserved thank you is extended to the interagency steering committee:

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Section: Patterns Around Individual Treessupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Structurementioning

confidence: 99%

Section: Undergrowth Productivitymentioning

confidence: 99%

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Proceedings - pinyon-juniper conference; 1986 January 13-16; Reno, NV

Everett¹

1987

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“…During his 12-year study, end-of-season, herbaceous, standing crops varied from 200 to 1000 kg per ha; differences in July-August precipitation explained over 40 percent of the variation in crop levels. Jameson (1966) examines differences in the effect of cover by one-seed juniper on growth of blue grama at sites either derived from granite or from limestone. Canopy densities up to 13 percent on the granite site and up to 31 percent of the limestone site had either no effect or even a positive effect on blue grama productivity.…”

Section: Forest Overstorylunderstory Relationshipsmentioning

confidence: 99%

An assessment of forest ecosystem health in the Southwest

Dahms¹,

Geils²

1997

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This report documents an ecological assessment of forest ecosystem health in the Southwest. The assessment focuses at the regional level and mostly pertains to lands administered by the National Forest System. Information is presented for use by forest and district resource managers as well as collaborative partners in the stewardship of Southwestern forests. The report establishes a scientific basis for conducting forest health projects, provides a context for planning ecosystem restoration, and contributes to the understanding of the physical, biological, and human dimensions of these ecosystems. Chapters describe Southwestern forest ecosystems of the past, changes since the Colonial Period, and the implications of those changes for the health of current and future forests. Opportunities, tools, and research needs for improving long-term sustainability of these forest ecosystems are also identified.

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The Ecological Connection in Farming, Ranching, and Gardening

Spaeth

2020

Soil Health on the Farm, Ranch, and in the Garden

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Pinyon-Juniper Litter Reduces Growth of Blue Grama

Cited by 39 publications

References 1 publication

Proceedings - pinyon-juniper conference; 1986 January 13-16; Reno, NV

Proceedings - pinyon-juniper conference; 1986 January 13-16; Reno, NV

An assessment of forest ecosystem health in the Southwest

The Ecological Connection in Farming, Ranching, and Gardening

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