Precipitation nutrients in the open and under two forests in Minnesota

1977 ◽  
Vol 7 (1) ◽  
pp. 112-119 ◽  
Author(s):  
Elon S. Verry ◽  
D. R. Timmons
Keyword(s):  
Forest Floor ◽  
Black Spruce ◽  
Inorganic Nitrogen ◽  
Annual Precipitation ◽  
Nutrient Inputs ◽  
Nutrient Input ◽  
Forest Canopies ◽  
North Central ◽  
Annual Amount ◽  
Total P

Concentrations of N, P, K, Ca, Mg, and Na were measured in rain and snow in the open, and in throughfall and stemflow under black spruce and aspen forests in north-central Minnesota. Concentrations of total P in rain and black spruce throughfall were inversely related to storm size. Annual precipitation nutrient inputs to the forest floor were calculated for each site. In general, nutrient contributions from snow were less than 10% of the annual nutrient input from precipitation at each site, and differences in snow nutrient input between sites were minimal. Rainfall nutrient input differed significantly between sites. Rain and snow passing through both forest canopies were enriched with nutrients except inorganic nitrogen. Total annual nutrients added to the forest floor under the black spruce stand averaged 1.7 times that added in the open; the annual amount added under the aspen stand averaged 5.2 times that added in the open.

The effects of experimental fires on black spruce forest floors in interior Alaska

1983 ◽  
Vol 13 (5) ◽  
pp. 879-893 ◽  
Author(s):  
C. T. Dyrness ◽  
Rodney A. Norum
Keyword(s):  
Forest Floor ◽  
Black Spruce ◽  
Mineral Soil ◽  
Available P ◽  
Small Scale ◽  
Total N ◽  
Burned Areas ◽  
Forest Floors ◽  
Surface Mineral ◽  
Total P

Seven units (about 2 ha each) of black spruce – feather moss forest were experimentally burned over a range of fuel moisture conditions during the summer of 1978. Surface woody fuels were sparse and the principal carrier fuel was the forest floor (largely mosses and their decomposition products). Forest floors after burning comprised a small-scale mosaic of unburned, scorched, lightly burned, moderately burned, and heavily burned (organic materials entirely consumed) conditions. Percentage of the unit area in the moderately and heavily burned condition ranged from 11.2 to 77.2% and percent decrease in forest-floor thickness varied from 27.4 to 63.1% in the seven units. Forest-floor consumption was most closely correlated with the moisture content of lower moss (01 horizon) and lower duff layers (022 horizon) at the time of burning. For the first 3 years after fire, biomass production was greater on heavily burned than on lightly burned sites (58 vs. 37 g/m2 on an annual basis). Heavily burned sites were completely dominated by the invading species Epilobiumangustifolium L., Ceratodonpurpureus (Hedw.) Brid., and Marchantiapolymorpha L., whereas lightly burned plots were occupied by sprouting species such as Calamagrostiscanadensis (Michx.) Beauv., Vacciniumuliginosum L., and Ledumgroenlandicum Oeder. Soil pH and amounts of total P and available P in the forest floor increased significantly as a result of burning; and in all cases, increases reached a maximum in moderately and heavily burned areas. Total N in the forest floor increased significantly in moderately burned, but decreased slightly in heavily burned areas. Total N and total P showed smaller increases in the surface mineral soil as a result of burning. Supplies of available P in the mineral soil increased almost 4-fold in moderately burned and over 16-fold in heavily burned areas.

Low-site class black spruce and jack pine nutrient removals after full-tree and tree-length logging

1983 ◽  
Vol 13 (6) ◽  
pp. 1030-1036 ◽  
Author(s):  
G. F. Weetman ◽  
D. Algar
Keyword(s):  
Black Spruce ◽  
Jack Pine ◽  
Coarse Sand ◽  
Nutrient Inputs ◽  
Site Class ◽  
Mg Deficiency ◽  
N Supply ◽  
Tree Length ◽  
Potentially Mineralizable N ◽  
Range Of Values

An old, merchantable, low-site class black spruce (Piceamariana (Mill.) B.S.P.) stand growing on a Lithic Humo-Ferric Podzol overlying a granite bedrock, and a younger but merchantable low-site class jack pine (Pinusbanksiana Lamb.) stand growing on a Ferro-Humic Podzol overlying a deep coarse sand near Baie Comeau, P.Q., were analysed for stand biomass and macronutrient contents of both stand and soil. The magnitude of the depletions of macronutrients from the site, in full-tree and tree-length methods of logging, are compared with their available and total quantities in the soil. The range of values from the literature for nutrient inputs are presented and discussed in relation to logging losses. The results suggest that full-tree logging in the dry jack pine stand could cause a severe loss of potentially mineralizable N supply; P, K, and Mg deficiency problems owing to export are not apparent, but a Ca balance problem is apparent. The implication is that full-tree logging should be avoided on such sites.

scholarly journals Nutrient Uptake and Agronomic Efficiencies of Leaf Litter Compost as Nitrogen Source in Vegetable Cowpea (Vigna unguiculata subsp. unguiculata)

2021 ◽  
Author(s):  
Reshma Das ◽  
Sheeba Rebecca Isaac
Keyword(s):  
Nutrient Uptake ◽  
Leaf Litter ◽  
Vigna Unguiculata ◽  
Crop Residues ◽  
Block Design ◽  
Poultry Manure ◽  
Nitrogen Sources ◽  
Nutrient Inputs ◽  
Nutrient Input ◽  
Nutrient Contents

Background: Nutritional security overrides food security and the present day agriculture focusses more on sustainable and regenerative agriculture in which use of organic inputs assumes prime significance. The search for viable alternatives to the chemical sources of nutrients demands production of the organic nutrient inputs in large quantities. Organic nutrition is expensive on account of the low nutrient contents and large quantum needed and hence unless produced in situ, turn out to be highly expensive. Organic wastes in the form of crop residues are available in plenty in agricultural fields. Tree leaf litter is another biowaste considered as menace under off farm situations. Rapid resource recycling techniques offer immense potential for the safe disposal of the litter and conversion to quality manures. In this background an experiment was conducted to assess the efficacy of litter composts as nitrogen sources in vegetable cow pea (Vigna unguiculata subsp. unguiculata) in terms of the agronomic efficiencies and nutrient uptake. Methods: The field experiment was conducted in College of Agriculture, Vellayani, Thiruvananthapuram, Kerala Agricultural University during December 2018 to March 2019 in randomized block design with three replications. The treatments included the compost of the two tree species litter prepared by composting with different decomposer organisms and additives and enriched with the biofertilizer, PGPR Mix I. Result: The results of the experiment revealed the highest vegetable yields (7.80 t ha-1) in the treatment involving mango leaf litter composted with glyricidia leaves and earthworms on par with Kerala Agricultural University package of practices recommendation for cowpea and it was 2.7 times that in absolute control. The total nutrient uptake was the highest with mango litter co-composted with poultry manure as nutrient input. Agronomy efficiency indices, in terms of nitrogen were significantly superior for the treatments including mango litter composts and hence prove a suitable nutrient input in vegetable cowpea cultivation.

scholarly journals Changes and contemporary trends in the annual amounts of precipitation in Serbia

2021 ◽  
Vol 44 ◽  
pp. 73-79
Author(s):  
Hristo Popov ◽  
Jelena Svetozarevich
Keyword(s):  
Balkan Peninsula ◽  
Middle Part ◽  
River Valley ◽  
Annual Precipitation ◽  
Precipitation Data ◽  
Southeast Europe ◽  
The Republic ◽  
River Valleys ◽  
Annual Amount ◽  
The Sava River

The Republic of Serbia is а continental country located in the western part of the Balkan Peninsula, in Southeast Europe. In terms of physical characteristics, Serbia is divided into two parts: Pannonian part and mountainous part. The northern part of the country is located in the valley of the Middle Danube, the Sava River valley and the Tisza River valley. In the middle part of the country, the river valleys of the Drina, the Kolubara and the Morava are located. For the purposes of this research, the authors have used the annual precipitation data from 15 meteorological stations distributed throughout the Republic of Serbia. The data from these meteorological stations for the period between 1991 and 2019 has been provided by The Serbian Institute of Meteorology and Hydrology. This data has been used to calculate the annual amount of precipitation, and the trends in annual precipitation.

Forest floor mass and nutrients in two chronosequences of plantations: Jack pine vs. black spruce

1998 ◽  
Vol 78 (1) ◽  
pp. 77-83 ◽  
Author(s):  
Helmut Krause
Keyword(s):  
Nutrient Cycling ◽  
Picea Mariana ◽  
Forest Floor ◽  
Pinus Banksiana ◽  
Forest Cover ◽  
Black Spruce ◽  
Jack Pine ◽  
Pine Plantations ◽  
Nutrient Concentrations ◽  
Natural Forests

The purpose of this study was to determine whether change of forest cover had an effect on the development of the organic surface horizons, particularly on those variables that influence nutrient cycling and forest productivity. Jack pine (Pinus banksiana Lamb.) and black spruce (Picea mariana [Mill.] B.S.P.) plantations were selected from among the youngest to oldest (2–16 yr) within a 100 km2 area in southeastern New Brunswick. Natural forests were also included as benchmark sites. The forest floor and tree foliage was sampled and trees measured on 0.05-ha plots. The forest floor samples were used to determine organic mass, nutrient contents and pH. In pine plantations, organic matter accumulated rapidly during the period of exponential tree growth, but leveled off at about 45 Mg ha–1. This was within the range of benchmark sites with mixed conifer-hardwood cover. In spruce plantations, the forest floor mass ranged upward to 77 Mg ha–1. Development was strongly influenced by the nature of the previous forest. Spruce forest floors were on average more acid and had lower nutrient concentrations, particularly N and Ca. The observed differences suggest that nutrients are recycled more rapidly in the pine plantations, partly explaining the superior growth of the latter. Key words: Forest floor, Kalmia angustifolia L., Picea mariana (Mill.) B.S.P., Pinus banksiana Lamb., nutrient cycling, plantation forest

scholarly journals A Range Extension for the Rock Vole, Microtus chrotorrhinus, in Labrador

2005 ◽  
Vol 119 (3) ◽  
pp. 412 ◽  
Author(s):  
Sarah W. Lansing
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Range Extension ◽  
Southern Coast ◽  
Central Coast ◽  
North Central ◽  
The North ◽  
Southern Island

Rock Voles (Microtus chrotorrhinus) were previously documented only from the southern coast of Labrador and the Strait of Belle Isle south of Hamilton Inlet. During two field seasons in 2000 and 2001, both in July, six Rock Vole specimens were collected on Southern Island, off the north-central coast of Labrador, extending the range of the subspecies Microtus chrotorrhinus ravus approximately 250 km to the central Labrador coast north of Hamilton Inlet. Rock Voles were trapped primarily in stunted Black Spruce (Picea mariana) forest and areas associated with rocks, thick brush, and water.

scholarly journals Nitrogen and Phosphorus Budget for a Deep Tropical Reservoir of the Brazilian Savannah

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1205 ◽  
Author(s):  
Jackeline do S. B. Barbosa ◽  
Valéria R. Bellotto ◽  
Damiana B. da Silva ◽  
Thiago B. Lima
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Dynamics ◽  
Wastewater Treatment Plants ◽  
Organic Phosphorus ◽  
Inorganic Nitrogen ◽  
Nutrient Input ◽  
Nitrogen And Phosphorus ◽  
Tropical Reservoir ◽  
Artificial Lake ◽  
Total Organic Nitrogen

This research investigated the source and fate of different chemical species of N and P on a deep tropical urban reservoir, the artificial Lake Paranoá, located in the city of Brasilia (Brazil). To determine an N and P budget, nutrient input from the external load (four main tributaries and two wastewater treatment plants), internal load (from sediment) and nutrient output (from a downstream dam) were estimated empirically. Nutrient storage was evaluated in two compartments: water column and sediment. Nutrient input from the tributaries varied by season presenting higher loads in the wet season, especially N. Nutrient budgets in our study indicated that Lake Paranoá retained dissolved inorganic nitrogen (DIN), PO43−-P, total organic phosphorus (TOP) and exported total organic nitrogen (TON), both on a seasonal and annual scale. Surface sediment is the major storage compartment for both N and P. These results show the pressing need for action to reduce the P outcome charges, mainly, from the wastewater treatment plants. The data here presented contributes to the recognition of this situation and to a better comprehension of these nutrient dynamics, as well as an understanding of the behavior of tropical deep-water reservoirs. This can help to promote more effective management, providing a reference for other similar systems.

Alternate Strip Clearcutting in Upland Black Spruce: VIII. Shallow-soil Ecosystems and Their Classification

1988 ◽  
Vol 64 (1) ◽  
pp. 70-75 ◽  
Author(s):  
Richard A. Sims ◽  
William D. Towill
Keyword(s):  
Black Spruce ◽  
Mineral Soil ◽  
Fragile Sites ◽  
Soil Types ◽  
Northern Ontario ◽  
North Central ◽  
The North ◽  
Shallow Soil ◽  
Soil Ecosystems ◽  
Shallow Soils

Shallow-soil sites in the Nipigon-Beardmore area of northern Ontario are widespread and pose unique operational problems for forest managers. Several working definitions of shallow soils are used in Ontario. More accurate regional definitions are required in order that silvicultural decisions for these sometimes fragile sites may be refined or new ones developed. Harvesting and silvicultural options for shallow-soil sites are limited in the North Central Region.A program of Forest Ecosystem Classification (FEC) for the North Central Region has been designed to provide better understanding of shallow sites and a framework of standardized definitions. The FEC describes several shallow-soil types that occur over boulder pavement or bedrock, and differentiates mainly on the basis of depth-to-rock contact, surface organic material thickness and texture of the primary mineral soil particles. Operational application of this classification may require identification of complexes of shallow-soil types.

The effect of wildfire on soil chemistry in four forest types in interior Alaska

1989 ◽  
Vol 19 (11) ◽  
pp. 1389-1396 ◽  
Author(s):  
C. T. Dyrness ◽  
K. Van Cleve ◽  
J. D. Levison
Keyword(s):  
Forest Floor ◽  
Soil Chemistry ◽  
Black Spruce ◽  
Mineral Soil ◽  
White Spruce ◽  
Available P ◽  
Ph Effects ◽  
Quaking Aspen ◽  
Forest Types ◽  
Surface Mineral

Soil chemical properties were studied after a wildfire in stands of white spruce (Piceaglauca (Moench) Voss), black spruce (Piceamariana (Mill.) B.S.P.), paper birch (Betulapapyrifera Marsh.), and quaking aspen (Populustremuloides Michx.). Samples of the forest floor and surface 5 cm of mineral soil were collected from burned sites and unburned controls and analyzed soon after the fire. With the exception of soil pH, effects of the fire on soil chemistry differed among the four forest types. Generally, amounts of exchangeable K, Ca, and Mg did not appreciably increase in the forest floor and surface mineral soil except in heavily burned areas in white spruce and black spruce. Fire reduced amounts of N by about 50% in white spruce, aspen, and birch forest floors. In black spruce, quantities of N were slightly higher in heavily burned locations. Forest floor C:N ratios were substantially lower in heavily burned locations in white spruce and black spruce than in unburned controls. Burning did not have a marked influence on supplies of available P in the forest floor, except in heavily burned black spruce, where average amounts were 12.50 g/m2 versus only 0.46 g/m2 in the control. Burning caused more moderate gains in available P in surface mineral soils under aspen and white spruce. We concluded that fire caused marked short-term changes in soil chemistry in the four forest types. How long these changes will persist is unknown.

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