Abstract:
:There has been an accelerated expansion of deserts in the past five decades. Recent data reveal that the atmogenically formed organic compound, trichloroacetic acid (TCA) is a contributory factor in addition to anthropogenic and natural sources. The aim of this study was to use TCA as an indicator for the possible occurrence of C2-chloroacetic acids; to assess the burden on the vegetation by using pine needles as a bio-indicator system and to deliberate on the possible role of TCA in the dynamics of the vegetation in southern Africa. Field experiments conducted on pine trees and on C3 and C4 crop plants under controlled laboratory conditions, have revealed that plants could be influenced positively or negatively by TCA. To obtain an integrated assessment of the pollution emission over a time span of at least one year, two-year-old pine needles of different Pinus species were used as a bio-indicator for TCA pollution at different measuring sites. The data of our investigation clearly indicate that areas exist in South Africa where the vegetation is burdened by ecotoxicologically relevant TCA contents comparable to those in central Europe and southern Russia where TCA was shown to play a role in the destabilisation of the steppe vegetation.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Weissflog L,Krüger GH,Kellner K,Pienaar JJ,Pfennigsdorff A,Seyfarth K,Ondruschka Bdoi
10.1007/s10661-004-4034-2subject
Has Abstractpub_date
2004-12-01 00:00:00pages
275-80issue
1-3eissn
0167-6369issn
1573-2959journal_volume
99pub_type
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