Differential tolerances among soft-water macrophyte species to acidification

1990 ◽  
Vol 68 (10) ◽  
pp. 2127-2134 ◽  
Author(s):  
G. H. P. Arts ◽  
J. G. M. Roelofs ◽  
M. J. H. De Lyon
Keyword(s):  
The Netherlands ◽  
Key Words ◽  
Indicator Species ◽  
Historical Data ◽  
Sandy Soils ◽  
Soft Water ◽  
Ecological Groups ◽  
Sharp Distinction ◽  
Macrophyte Species ◽  
Water Ph

Twenty-six macrophyte species were studied for their degree of tolerance to extremely acid conditions. They are characteristic of soft water on sandy soils in The Netherlands. These species were divided into two groups based on their recent distribution by pH and alkalinity. The first group consists of the species that can (at least temporarily) survive under extremely acid conditions (pH < 5); the second group contains species that are limited by a distinct minimum pH of the water (pH 5–6). This sharp distinction between groups on.the basis of pH can be used for reconstruction of the development of acidification in waters using historical data on the macrophytes involved. The two groups of species can be used to discriminate between two types of soft water in The Netherlands. Key words: soft-water macrophytes, ecological groups of macrophytes, autecology, acidification, indicator species.

Two Way Indicator Species Analysis (TWINSPAN) of the Herbaceous Vegetation in an Inland Wetland Ecosystem of Doon Valley Himalaya, India

1970 ◽  
Vol 3 ◽  
pp. 23-31 ◽  
Author(s):  
R. K. Manhas ◽  
M. K. Gautam ◽  
Deepa Kumari
Keyword(s):  
Soil Moisture ◽  
Key Words ◽  
Plant Species ◽  
Indicator Species ◽  
Indigenous Species ◽  
Indicator Species Analysis ◽  
Wetland Ecosystem ◽  
Herbaceous Vegetation ◽  
Doon Valley ◽  
Species Analysis

In swamp distribution, dominance and survival of a species is very much governed by the soil moisture and period of flooding. The present study was conducted to classify the communities and plant species, and to have an idea about various associations of plants present in the swamp with respect to soil moisture. Two way indicator species analysis (TWINSPAN) classified the communities into four and plant species into eleven groups. The communities with least soil moisture were the first to be segregated and with highest soil moisture last. Similarly, the species growing in drier condition was clustered separately from the moisture loving indigenous species. Key words: TWINSPAN; vegetation; inland wetland; India DOI: 10.3126/jowe.v3i0.2433 Journal of Wetlands Ecology, (2009) Vol. 3, pp 23-31

scholarly journals Factors influencing the sodium content of meadow grass.

1965 ◽  
Vol 13 (1) ◽  
pp. 21-47
Author(s):  
C.H. Menkens
Keyword(s):  
The Netherlands ◽  
Sandy Soils ◽  
Sodium Content ◽  
Clay Soils ◽  
N Fertilizers ◽  
Factors Influencing ◽  
High Soil ◽  
Fertilizer Recommendations ◽  
Soil K Status ◽  
Mg Content

Sodium content of grass was largely determined by Na content and K number of the soil. At a given Na content of soil, the Na content of grass decreased with increasing K number of the soil but the decrease was small where K number was >30. Na content of grass increased with increasing soil Na; the increase was higher at low- than at high soil-K status. K fertilizing lowered grass Na at low soil-K status. Soil-Na content can be used in the Netherlands as a basis for Na-fertilizer recommendations, since K number has generally reached a level at which it has an almost constant effect on Na content of grass. Influences of the K and Na status of the soil on the Na content of grass can be expressed as the ratios (15 X K number)/(Na2O+6) for sandy soils and (25X K number)/(Na2O + 14) for clay soils, the numerator at K numbers > 30 being the same as that at K number=30. With increasing ratios, the Na content of grass decreases. The influence on herbage -Na level of a given amount of Na in K fertilizers is correlated to these ratios. The influence of N fertilizers on Na content of grass was not clear and the influence of Mg fertilizers was negligible. Chile nitrate and Nad affected the Na of grass similarly, but Chile nitrate differed from NaCl in decreasing the Ca content; both fertilizers slightly lowered the Mg content of grass. Herbs and clovers contained more Na than grass does. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Analysis of settlings of Lutoviska commune since 2nd half of 18th century using GIS

2016 ◽  
pp. 198-207
Author(s):  
Ihor Kozak ◽  
Hanna Kozak
Keyword(s):  
Population Dynamics ◽  
Standard Deviation ◽  
Spatial Autocorrelation ◽  
Key Words ◽  
Spatial Statistics ◽  
Historical Data ◽  
18Th Century ◽  
Future Research ◽  
Standard Deviational Ellipse

The study was conducted within the actual area of Lutoviska commune in Bieszczady district, Podkarpackie voivodeship in Eastern Poland. The dynamics of settlements in Lutoviska commune from the 2nd half of the 18th century was discussed. Maps and historical data were analyzed in the ArcGIS 10.3 program. In the study there were presented possibilities of applying the ArcGIS for Desktop 10.3 program. We analyzed the Lutoviska commune in terms of the changes of settlements and used maps for the analysis of changes in its structure. The first of these was the historical map, namely the tactical map of “WIG” in scale 1:100 000 from 1936. Next we analyzed maps from 1965 and 2014, which were prepared applying the “WMS” server. The changes in the number of villages and households were presented. Population dynamics for Greek-Catholics, “Latynnykys” and Jews for the year 1785 and Ukrainians in comparison with the number of Poles and Jews for the year 1939 were shown. Ethnic and religious composition from the 2nd half of the 18th century was evaluated. Based on the study of spatial placement of settlements with the use of Spatial Statistics (Spatial Autocorrelation Global Moran’s test, Standard Deviational Ellipse and Mean Centre) the character of settlements distribution in Lutoviska commune was presented. There was confirmed a similar configuration of Standard Deviation Ellipse and Mean Center for Greek-Catholics-Ukrainians in 1785 and Ukrainians in 1939 in Lutoviska commune. The scale and results of such changes are interesting for future research, mainly in terms of the change of traditional village system infrastructure and culture. Key words: dynamics, village, GIS, Lutoviska commune.

scholarly journals Leaching of fluridone, hexazinone and simazine in sandy soils in the Netherlands.

1989 ◽  
Vol 37 (3) ◽  
pp. 257-262
Author(s):  
R. Zandvoort
Keyword(s):  
The Netherlands ◽  
Field Experiments ◽  
Sandy Soils ◽  
Coarse Sand ◽  
Transformation Rate ◽  
Soil Layers ◽  
Late Autumn ◽  
Winter Conditions

Fluridone and simazine were sprayed in field experiments on coarse and humic sandy soils in spring or in late autumn, and hexazinone on coarse sand in spring. After a spring application, over an eight-month period, fluridone and hexazinone were detected by bioassay in the profile of coarse sand from 0 to 60 cm, whereas simazine did not leach below 15 cm. Both fluridone and simazine were found to a depth of 60 cm in coarse sand after an application in late autumn. Thus, in winter conditions the transformation rate is not fast enough to prevent leaching of fluridone and simazine to deeper soil layers after autumn application. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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