Base cation saturation ratios vs. sufficiency level of nutrients: a false dichotomy in practice

2021 ◽  
Author(s):  
Steve W. Culman ◽  
Caroline Brock ◽  
Douglas Doohan ◽  
Douglas Jackson‐Smith ◽  
Catherine Herms ◽  
...  
Keyword(s):  
Base Cation ◽  
False Dichotomy

The Other Entrepreneurs - Migrant Economies as Spaces for Social Innovation?

2019 ◽  
Vol 16 (2) ◽  
pp. 265-271
Author(s):  
Claudia Lintner
Keyword(s):  
Social Innovation ◽  
Close Relation ◽  
The Other ◽  
Structural Level ◽  
Structured Interviews ◽  
Economic Activities ◽  
Migrant Entrepreneurship ◽  
False Dichotomy ◽  
Migrant Entrepreneurs ◽  
The One

This article analyses the relationship between migrant entrepreneurship, marginalisation and social innovation. It does so, by looking how their ‘otherness’ is used on the one hand to reproduce their marginalised situation in society and on the other to develop new living and working arrangements promoting social innovation in society. The paper is based on a qualitative study, which was carried out from March 2014- 2016. In this period, twenty semi-structured interviews were conducted with migrant entrepreneurs and experts. As the results show, migrant entrepreneurs are characterised by a false dichotomy of “native weakness” in economic self-organisation against the “classical strength” of majority entrepreneurs. It is shown that new possibilities of acting in the context of migrant entrepreneurship are mostly organised in close relation to the lifeworlds and specific needs deriving from this sphere. Social innovation processes initiated by migrant entrepreneurs through their economic activities thus develop on a micro level and are hence less apparent. Supportive networks are missing on a structural level, so it becomes difficult for single innovative initiatives to be long-lasting.

Site classification in a mixed hardwood forest (Hallerbos, Belgium) with a homogeneous ground vegetation dominated by Hyacinthoides non-scripta (L.) Chouard ex. Rothm.

1994 ◽  
Vol 59 ◽  
Author(s):  
D. Maddelein ◽  
B. Muys ◽  
J. Neirynck ◽  
G. Sioen
Keyword(s):  
Tree Species ◽  
Ph Value ◽  
Soil Analysis ◽  
Base Cation ◽  
Site Quality ◽  
Ground Vegetation ◽  
Site Classification ◽  
Species Classification ◽  
Tree Species Composition ◽  
Understorey Vegetation

The  forest of Halle (560 ha), situated 20 km south of Brussels is covered by a  beech (Fagus sylvatica)  forest, locally mixed with secundary species (Tilia,  Fraxinus, Acer, Quercus,... ). In almost all  stands, herbal vegetation is dominated by bluebell (Hyacinthoides  non-scripta).     The research intended to classify 36 plots of different tree species  composition according to their site quality. Three classification methods  were compared: the first one based on the indicator value of the understorey  vegetation, a second one on the humus morphology and a last one on some  quantitative soil characteristics. According to the plant sociological site  classification, the plots have the same site quality. However, humus forms  differ apparently and significant differences were found in pH value and base  cation saturation of the soil, abundance and biomass of earthworms and  biomass of the ectorganic horizon. Tree species proved to be the main cause  of these differences.     The results illustrate that the herbal vegetation is not always a reliable  indicator of site quality. In the case of a homogeneous vegetation dominated  by one or more indifferent species, classification on humus morphology or  soil analysis are more appropriate. In the forest of Halle, the tree species  is probably the main cause of the observed differences in site quality.

Levantine Art in the “Orientalizing” Period

2019 ◽  
pp. 369-383
Author(s):  
Marian H. Feldman
Keyword(s):  
Twentieth Century ◽  
Cultural Relations ◽  
Ancient Greek ◽  
The West ◽  
False Dichotomy ◽  
First Millennium

The “Orientalizing period” represents a scholarly designation used to describe the eighth and seventh centuries bce when regions in Greece, Italy, and farther west witnessed a flourishing of arts and cultures attributed to contact with cultural areas to the east—in particular that of the Phoenicians. This chapter surveys Orientalizing as an intellectual and historiographic concept and reconsiders the role of purportedly Phoenician arts within the existing scholarly narratives. The Orientalizing period should be understood as a construct of nineteenth- and twentieth-century scholarship that was structured around a false dichotomy between the Orient (the East) and the West. The designation “Phoenician” has a similarly complex historiographic past rooted in ancient Greek stereotyping that has profoundly shaped modern scholarly interpretations. This chapter argues that the luxury arts most often credited as agents of Orientalization—most prominent among them being carved ivories, decorated metal bowls, and engraved tridacna shells—cannot be exclusively associated with a Phoenician cultural origin, thus calling into question the primacy of the Phoenicians in Orientalizing processes. Each of these types of objects appears to have a much broader production sphere than is indicated by the attribute as Phoenician. In addition, the notion of unidirectional influences flowing from east to west is challenged, and instead concepts of connectivity and networking are proposed as more useful frameworks for approaching the problem of cultural relations during the early part of the first millennium bce.

Unionization or Collegiality: A False Dichotomy in Higher Education

Academe ◽  
1979 ◽  
Vol 65 (1) ◽  
pp. 46
Author(s):  
Walter I. Wardwell
Keyword(s):  
Higher Education ◽  
False Dichotomy

scholarly journals Current, steady-state and historical weathering rates of base cations at two forest sites in northern and southern Sweden: a comparison of three methods

2020 ◽  
Vol 17 (2) ◽  
pp. 281-304 ◽  
Author(s):  
Sophie Casetou-Gustafson ◽  
Harald Grip ◽  
Stephen Hillier ◽  
Sune Linder ◽  
Bengt A. Olsson ◽  
...  
Keyword(s):  
Steady State ◽  
Soil Depth ◽  
Base Cations ◽  
Base Cation ◽  
Mineral Weathering ◽  
Soil Horizon ◽  
Soil Horizons ◽  
Weathering Rate ◽  
Weathering Rates ◽  
Forest Sites

Abstract. Reliable and accurate methods for estimating soil mineral weathering rates are required tools in evaluating the sustainability of increased harvesting of forest biomass and assessments of critical loads of acidity. A variety of methods that differ in concept, temporal and spatial scale, and data requirements are available for measuring weathering rates. In this study, causes of discrepancies in weathering rates between methods were analysed and were classified as being either conceptual (inevitable) or random. The release rates of base cations (BCs; Ca, Mg, K, Na) by weathering were estimated in podzolised glacial tills at two experimental forest sites, Asa and Flakaliden, in southern and northern Sweden, respectively. Three different methods were used: (i) historical weathering since deglaciation estimated by the depletion method, using Zr as the assumed inert reference; (ii) steady-state weathering rate estimated with the PROFILE model, based on quantitative analysis of soil mineralogy; and (iii) BC budget at stand scale, using measured deposition, leaching and changes in base cation stocks in biomass and soil over a period of 12 years. In the 0–50 cm soil horizon historical weathering of BCs was 10.6 and 34.1 mmolc m−2 yr−1, at Asa and Flakaliden, respectively. Corresponding values of PROFILE weathering rates were 37.1 and 42.7 mmolc m−2 yr−1. The PROFILE results indicated that steady-state weathering rate increased with soil depth as a function of exposed mineral surface area, reaching a maximum rate at 80 cm (Asa) and 60 cm (Flakaliden). In contrast, the depletion method indicated that the largest postglacial losses were in upper soil horizons, particularly at Flakaliden. With the exception of Mg and Ca in shallow soil horizons, PROFILE produced higher weathering rates than the depletion method, particularly of K and Na in deeper soil horizons. The lower weathering rates of the depletion method were partly explained by natural and anthropogenic variability in Zr gradients. The base cation budget approach produced significantly higher weathering rates of BCs, 134.6 mmolc m−2 yr−1 at Asa and 73.2 mmolc m−2 yr−1 at Flakaliden, due to high rates estimated for the nutrient elements Ca, Mg and K, whereas weathering rates were lower and similar to those for the depletion method (6.6 and 2.2 mmolc m−2 yr−1 at Asa and Flakaliden). The large discrepancy in weathering rates for Ca, Mg and K between the base cation budget approach and the other methods suggests additional sources for tree uptake in the soil not captured by measurements.

A PROPOSED METHODOLOGY FOR ASSESSING THE RELATIVE IMPACT OF ACID RAIN AND NITROGEN FERTILIZERS ON ACIDITY OF AGRICULTURAL SOILS IN CANADA

1989 ◽  
Vol 69 (3) ◽  
pp. 611-627 ◽  
Author(s):  
D. R. COOTE ◽  
S. SHAH SINGH ◽  
C. WANG
Keyword(s):  
Acid Rain ◽  
Agricultural Soils ◽  
Field Measurements ◽  
Base Cation ◽  
Microbial Reduction ◽  
Base Saturation ◽  
Nitrogen Fertilizers ◽  
N Fertilizers ◽  
Reduction Plant ◽  
Sulfate Leaching

Acid rain and N fertilizers both contribute to soil acidity, but no method has been available to compare their relative impacts. A simple model (SOLACID) is presented to assess quantitatively the acidifying effects of precipitation and N fertilizers on agricultural soils. Acid rain has been treated as a dilute solution of NH4NO3, (NH4)2SO4 and associated acids. Soil and plant pathways are considered for [Formula: see text], [Formula: see text]and [Formula: see text] by way of leaching, gaseous losses from microbial reduction, plant uptake and removal, and organic immobilization and mineralization. Leaching of [Formula: see text] was the factor to which the model was most sensitive. A relationship between base saturation and base cation leaching is described. Field data reported from 21 treatments at six experimental sites were used to test the model, which provided reliable estimates of final pH (r2 = 0.92**) and of changes in base saturation (r2 = 0.86**). Compared with previously published methods, the model provided the best estimates of lime requirements as computed from field measurements (r2 = 0.87**). Key words: Ammonia, sulfate, leaching, nitrification

Base cation and silicon biogeochemistry under pine and scrub oak monocultures: implications for weathering rates

Geoderma ◽  
2005 ◽  
Vol 126 (3-4) ◽  
pp. 353-365 ◽  
Author(s):  
J.L. Johnson-Maynard ◽  
R.C. Graham ◽  
P.J. Shouse ◽  
S.A. Quideau
Keyword(s):  
Base Cation ◽  
Weathering Rates ◽  
Scrub Oak ◽  
Silicon Biogeochemistry
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