Soil fertility after logging in the northern Rocky Mountains

1982 ◽  
Vol 12 (3) ◽  
pp. 679-686 ◽  
Author(s):  
N. Stark
Keyword(s):  
Nutrient Cycling ◽  
Soil Fertility ◽  
Rocky Mountains ◽  
Root Zone ◽  
Leaching Losses ◽  
Northern Rocky Mountains ◽  
Dry Biomass ◽  
Below Ground ◽  
Time Of Harvest ◽  
Whole Tree

Measurements of dry biomass, the concentration of 10 biologically essential ions and other data from compartments of a Douglas-fir – western larch (Pseudotsugamenziesii (Mirb.) Franco – Larixoccidentalis Nutt.) forest were used to study the nutrient impacts of various harvest treatments. Precipitation additions about equalled leaching losses as has been shown elsewhere. Any ions lost in harvest must be replaced by available ions in the soil root zone and ions recycled from decay above and below ground. Conventional harvest of wood >7.6 cm removes about 1% of the total ecosystem cations. Data show that decay and available and accessible soil ions could easily replace the ions lost in a single rotation with conventional harvest. Total aboveground harvest would reduce the decomposer populations and remove the supporting substrate, resulting in possible ion deficiencies during the next rotation (excluding weathering additions). Whole-tree harvest would leave marginal amounts of Mn available or recyclable in the ecosystem on these young soils to support the next rotation. Two guidelines for harvest and nutrient cycling in the Rocky Mountains were developed: (i) The growth of a forest within a rotation should not be subsidized by ions released through weathering during that rotation because the soil will not mature in fertility. (ii) There should be enough biologically essential ions on site at the time of harvest to grow the next three to four forest rotations to maintain a healthy ecosystem.

Spatial databases for the geology of the northern Rocky Mountains - Idaho, Montana, and Washington

2005 ◽  
Author(s):  
Michael L. Zientek ◽  
Pamela D. Derkey ◽  
Robert J. Miller ◽  
J. Douglas Causey ◽  
Arthur A. Bookstrom ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Spatial Databases ◽  
Northern Rocky Mountains

Guide to geophysical data for the northern Rocky Mountains and adjacent areas, Idaho, Montana, Washington, Oregon, and Wyoming

2004 ◽  
Author(s):  
Edward A. Mankinen ◽  
Thomas G. Hildenbrand ◽  
Michael L. Zientek ◽  
Stephen E. Box ◽  
Arthur A. Bookstrom ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Geophysical Data ◽  
Northern Rocky Mountains

Holocene climate recorded by magnetic properties of lake sediments in the Northern Rocky Mountains, USA

The Holocene ◽  
2019 ◽  
Vol 30 (3) ◽  
pp. 479-484
Author(s):  
Daniel P Maxbauer ◽  
Mark D Shapley ◽  
Christoph E Geiss ◽  
Emi Ito
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Rocky Mountains ◽  
Future Research ◽  
Magnetic Minerals ◽  
Holocene Climate ◽  
Northern Rocky Mountains ◽  
The North ◽  
Lake Bottom ◽  
Northern Rockies

We present two hypotheses regarding the evolution of Holocene climate in the Northern Rocky Mountains that stem from a previously unpublished environmental magnetic record from Jones Lake, Montana. First, we link two distinct intervals of fining magnetic grain size (documented by an increasing ratio of anhysteretic to isothermal remanent magnetization) to the authigenic production of magnetic minerals in Jones Lake bottom waters. We propose that authigenesis in Jones Lake is limited by rates of groundwater recharge and ultimately regional hydroclimate. Second, at ~8.3 ka, magnetic grain size increases sharply, accompanied by a drop in concentration of magnetic minerals, suggesting a rapid termination of magnetic mineral authigenesis that is coeval with widespread effects of the 8.2 ka event in the North Atlantic. This association suggests a hydroclimatic response to the 8.2 ka event in the Northern Rockies that to our knowledge is not well documented. These preliminary hypotheses present compelling new ideas that we hope will both highlight the sensitivity of magnetic properties to record climate variability and attract more work by future research into aridity, hydrochemical response, and climate dynamics in the Northern Rockies.

Tracing the nitrogen, sulfur, and carbon released from plant residues in a soil/plant system

Soil Research ◽  
2000 ◽  
Vol 38 (3) ◽  
pp. 699 ◽  
Author(s):  
Yothin Konboon ◽  
Graeme Blair ◽  
Rod Lefroy ◽  
Anthony Whitbread
Keyword(s):  
Triticum Aestivum ◽  
Nutrient Cycling ◽  
Wheat Straw ◽  
Medicago Truncatula ◽  
Plant Residue ◽  
Plant Residues ◽  
Plant Nutrient ◽  
N Loss ◽  
Leaching Losses ◽  
Nutrient Demand

Matching plant residue mineralisation rate to plant nutrient demand is one way of increasing the efficiency of nutrient cycling. A glasshouse experiment was conducted in a Soloth soil with a C4d13 C signature using drained pots to examine the effect on the yield of Japanese millet (Echinochloa frumentocea) and the fate of 15 N, 35 S, and C (using d 13 C shift) from the C 3 plants Flemingia macrophylla, Medicago truncatula hay, and wheat (Triticum aestivum) straw applied at 3 t/ha in the presence of N and NPKS fertiliser. The yield of Japanese millet at 91 days was highest where medic hay had been added (13.7 g/pot) and lowest where wheat straw was used (11.5 g/pot). Recovery of 35 S by the millet was highest in the wheat straw and medic hay treatments (mean 11.5%), whilst recovery of 15 N was highest from medic hay (15.8%). Leaching losses of 35 S were highest in the Flemingia and medic treatments (mean 8.1%), and 15 N loss in leachate was highest in the medic hay treatment (6.6%). A maximum of 1.5% of the C added in residues was recovered in the leachate of the medic hay treatment.

scholarly journals The Distribution of Glaciers in the Rocky Mountains of the United States

1977 ◽  
Vol 18 (79) ◽  
pp. 325-328 ◽  
Author(s):  
W. L. Graf
Keyword(s):  
United States ◽  
Rocky Mountains ◽  
The United States ◽  
Aerial Photographs ◽  
Northern Rocky Mountains ◽  
Southern Rocky Mountains

AbstractEvidence from aerial photographs, maps, and field checks indicates that 319 glaciers lie in cirques of the Rocky Mountains, south of the United States-Canadian border. On a subcontinental scale, the distribution of glaciers is highly clustered, with larger and denser clusters located in the northern Rocky Mountains. Lesser concentrations of small glaciers occur in the southern Rocky Mountains. The total area of glaciers in the Rocky Mountains of the U.S.A. is 78.9 km2.

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