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A constant trend in Prague is a growth of built-up areas , particularly at the expense of agricultural land and so-called other areas, as indicated by information from the Real Estate Cadastral Register. Between 1990 and 1997, some 0.6 % of Prague´s total area of 49,600 hectares were affected by such changes; more specifically, the total built-up area increased from 4,241 hectares to 4,611 hectares (+370 hectares), while the total agricultural land area shrank from 21,603 hectares to 21,352 hectares (-251 hectares). Increments/decrements of aggregate areas of different
land types
* differences
in totals are due to rounding Source: CÚZK
Categories of forests
Source: ÚHÚL
As to the analyses of the samples taken on farming land their results were evaluated using the criteria and limits set forth in Decree No. 13/1993 Coll., on the protection of agricultural land fund. Insofar as other land is concerned the analyses were evaluated using the limits laid down in the Methodological Directive of the Ministry of the Environment of the Czech Republic on the criteria applying to contaminated soil and polluted groundwater published in August 1996 (an update of its previous statement regarding standards and criteria applying to contaminated soil and polluted groundwater sanitization). There are three limits used to assess the soil contamination level: A
- Type A criteria are more or less consistent with natural
concentrations. Any excess is viewed as an environmental component
pollution case. Fourteen sites have been monitored on a regular basis since 1981, but there have not been any essential changes in the concentrations of selected hazardous substances over the whole period at any of the sites. There are persistently high concentrations of heavy metals (under Limit B) in Husova, Karlovo námestí, Smetanovo nábrezí, Nám. 14. ríjna, and also in Delnická, Rohanský ostrov or Kolbenovo nám.
High mercury levels are typical for sites in the center of the city. Non-polar extractable substances occur in concentrations well above Limit A at all the sites. In Delnická they were found to exceed Limit C, in some other sites, especially nám. Jirího z Podebrad, Smetanovo nábrezí, Nám. 14. ríjna, concentrations approach Limit B. Sites marked as potentially contaminated
areas during the mapping of waste dumps and historical
contamination sites
were selected (Hloubetín, Morušová,
parking garages of Prague Municipal Transport Company, Reinerova,
and Zbraslav Railway Station). See information about historical contamination sites
The study in Troja Basin has confirmed a generally observable trend namely that of the degradation of natural assemblages caused by anthropogeneous impacts (especially by airborne pollution) having stopped since 1992, and some indicators even having exihibited a reversal and revitalization . A study of lichens was undertaken for the first
time ever. The survival of just nine epiphytes out of the total
number of 72 lichen species identified there. Bryological data
indicates the disappearance of a number of moss species. In the area under study the process
of short-term revitalization is clearly manifested on assemblages of
molluscs. The findings concerned to
number of butterfly species are regarded as indicative of a
stabilized situation.
(Why?
See pressure on
landscape) A slight decline
of the number of butterfly species and a considerable drop in their
overall number compared to the previous inventories in 1987 and 1992
result from a long and hard winter, which have had similar
consequences in the whole territory of Bohemia as well as elsewhere
in Europe. The findings are regarded as indicative of a stabilized
situation.
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What
is the general situation with land use? 
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