Nitrogen Accretion in Developing Ceanothus Velutinus Stands

Youngberg, C. T.; Wollum, A. G.

doi:10.2136/sssaj1976.03615995004000010029x

Cited by 67 publications

(31 citation statements)

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“…bean plants) are important in TN storage. Many studies have found that nitrogen-fixing species can significantly increase soil N levels (Youngberg and Wollum 1976;Binkley 1992).…”

Section: Soil Chemical Characteristicsmentioning

confidence: 99%

Properties of Soils under Different Land Uses in Chittagong Region, Bangladesh

Osman¹,

Haque²

2015

Journal of Forest and Environmental Science

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In this study, we investigated the effects of three land uses on soil properties in two soil layers; surface soil (0∼15 cm) and subsoil (15∼30 cm). Soil samples were collected from planted forest, barren lands and cultivated lands from different areas in Chittagong Cox's Bazar and analyzed for some physical and chemical properties. Results showed that soil textural class varied from sandy clay loam in planted forest and barren land site to sandy loam in cultivated soils. Maximum water holding capacity was higher in forest followed by barren land and the lowest in cultivated lands. At both soil depths, soils of cultivated land showed the highest values of bulk density (1.42 to 1.50 g cm -3), followed by barren lands (1.37 to 1.46 g cm -3) and the least (1.32 to 1.45 g cm -3) in forest soils. Total porosity decreased with depth ranging from 40.24% to 41.53% in subsoils and from 42.04 to 43.23% in surface soil of cultivated and of planted forest sites respectively. The result further revealed that organic carbon (OC) and total nitrogen (TN) contents were higher in the planted forest soil than in other two land uses. The soils of all land uses under study are acidic in nature and the lowest pH was found in both surface and subsoils of barren land. Cultivated soil contained the highest amount of available P, Ca, Mg and K in both surface soil and subsoils. In contrast, barren site had the lowest contents of available P, Ca, Mg and K in both layers. The soil organic carbon (SOC) and total N storage were higher in planted forest than in barren and cultivated land uses.

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“…bean plants) are important in TN storage. Many studies have found that nitrogen-fixing species can significantly increase soil N levels (Youngberg and Wollum 1976;Binkley 1992).…”

Section: Soil Chemical Characteristicsmentioning

confidence: 99%

Properties of Soils under Different Land Uses in Chittagong Region, Bangladesh

Osman¹,

Haque²

2015

Journal of Forest and Environmental Science

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“…Ceanothus velutinus is a pioneer species that invades after site such disturbances as fire in the eastern Sierran forests. Ceanothus is especially adapted to fire; heat treatment followed by cold stratification is required for seed germination (Zavitkovski and Newton 1968;Youngberg and Wollum 1976). Seeds lying dormant in forest litter for many years are activated by fire and winter weather, resulting in prolific germination in areas of wildfire, clearcut, or slash burn.…”

Section: Effects On Nutrient Cycling and Transportmentioning

confidence: 99%

“…On the other hand, in Little Valley, Nevada, patches of Ceanothus are common in a mosaic of 110-year-old Jeffrey pine forests. Furthermore, the benefits of Ceanothus on site fertility are clear; it replaces the N lost in fire and usually results in greater soil carbon and N contents than were there originally (Youngberg and Wollum 1976;Binkley et al 1982;. A prescribed low intensity burn in Pope Marsh resulted in increased nitrogen loading in spring runoff prior to the reestablishment of vegetation on the site (Norman 1997a).…”

Section: Effects On Nutrient Cycling and Transportmentioning

confidence: 99%

Lake Tahoe watershed assessment: volume I

Murphy¹,

Knopp²

2000

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The United States Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation and marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) This watershed assessment of the Lake Tahoe basin in northern California and Nevada is the first attempt to collate, synthesize, and interpret available scientific information with a comprehensive view toward management and policy outcomes. The seven-chapter report presents new and existing information in subject areas pertinent to policy development and land and resource management in the basin, including environmental history, air quality, watershed dynamics and water quality, biological integrity, and socioeconomic conditions. Key findings report the extent of recent climatic changes, historic accounts of past environmental disturbances, state of our understanding of why the Lake's clarity is declining, significant role that air quality plays in the decline, and an initial nutrient budget for nitrogen and phosphorous that are believed to fuel algae growth. In addition, important new work related to old-growth forests, the risk of wildfire and the conservation of biological diversity in the basin have helped to broaden our perspective of the interrelated nature of the environmental challenge facing the basin. A detailed analysis of institutional arrangements and capacities in the Lake Tahoe basin is presented in the context of environmental decision-making.

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“…The authors speculated that removal of shrubs, particularly snowbrush ceanothus, abundant only within this exclosure, might alter rates of nutrient accumulation in soils, because Ceanothus spp. can fix atmospheric nitrogen (Youngberg andWollum 1976, Zavitkowski andNewton 1968). Tiedemann and Berndt (1972) found that herbivory reduced litter, which was 1.4 times greater inside than on the outside.…”

Section: Observed Effects Of Large Herbivores On Plants and Soils In mentioning

confidence: 99%

Effects of long-term use by big game and livestock in the Blue Mountains forest ecosystems.

Irwin¹,

Cook²,

Riggs³

et al. 1994

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There is empirical evidence that persistent herbivory by large mammals caused moderate to severe reduction of shrubs and forage productivity in a variety of logged and unlogged forest communities, with subsequent effects on frequency of wildfire and conifer seedling establishment in some plant communities. Long-term herbivory was shown to have alternative effects by either improving or reducing wood-fiber production by reducing competition from understory plants or reducing soil fertility. The changes in plant communities caused by the herbivores may have had negative feedback effects to productivity of both elk and cattle. Cattle do not achieve desired weight gains on summer allotments. Empirical studies on forage quality and livestock nutritional status support a view that large domestic and wild mammals subsist on suboptimal forage conditions most of the year in the Blue Mountains. Survival of elk calves appears low, partly as a result of density-induced shortages of high-quality forage. The reduced calf production appears to be exacerbated by low adult bull:cow elk ratios, which reduces calf survival via delayed and lengthy birthing periods. The low bull:cow ratios are a result of reduced cover due to logging and increased access to hunters due to logging roads. Reduced big game productivity has led to restrictions on hunting opportunities, with concomitant losses in revenue to local economies. In addition, the dense elk herds, in concert with forest management activities on federal lands, have resulted in increased use by elk on private lands, where they damage crops. The paper identifies adaptive management experiments that could identify options for-clarifying the complex relationships between herbivores, vegetation, and ecosystem processes and identify management options for restoring forest health.

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Nitrogen Accretion in Developing Ceanothus Velutinus Stands

Cited by 67 publications

References 0 publications

Properties of Soils under Different Land Uses in Chittagong Region, Bangladesh

Properties of Soils under Different Land Uses in Chittagong Region, Bangladesh

Lake Tahoe watershed assessment: volume I

Effects of long-term use by big game and livestock in the Blue Mountains forest ecosystems.

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