Ancestral semi-natural meadows, locally called “Lameiros”, are an essential element of the mountain landscapes in Northern Portugal. These meadows are frequently located in areas of high water availability, loamy soils and over 700-800m hight. In association with these meadows can be found traditional irrigation systems, in which the water is applied all year around, to assure the crop water re...

In recent years, the importance of trace metal mobile fractions rather than total contents in environmental matrices is increasing in risk assessment evaluation of contaminated sites. In this study different leaching/extraction tests, aimed at the measurements of mobile fractions of trace metals and standardized at European Committee for Standardization (CEN) for the characterization of waste, ...

Introduction Conclusions References

In the first place, we have to piece together the bits and pieces which most resemble each other. As there are a number of qualities common to obviously unrelated pieces in our puzzle, we select certain basic patterns, and group the pieces together according to those basic patterns, irrespective of whether they have qualities which, on first appearance, do not appear to be reserved to anyone gr...