By Alan A. Lucier, Sharon G. Haines

A distinctive contribution to the literature on acidic deposition, this quantity bargains a suite of in-depth research of the main mechanisms governing woodland reaction to acidic inputs. one of the mechanisms reviewed listed below are foliage leaching, aluminum mobilization, mineral weathering, soil organisms, and rhizosphere procedures. Researchers and scholars in soil technology, wooded area ecology, and environmental technology, in addition to coverage makers and wooded area managers desirous about review of acidic deposition results will price this concise monograph for its precise exam of chosen technical matters and its entire reference sections.

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1984. Direct transfer of newly-fixed nitrogen from free-living epiphyllous microorganisms to their host plant. Oecologia 63:52-56. H. 1973. The monocotyledons: Their evolution and comparative biology-mineral nutrition and related phenomena in Bromeliaceae and Orchidaceae. Q Rev BioI 48:277-290. Bernhard-Renversat, E 1975. Nutrients in throughfall and their quantitative importance in rain forest mineral cycles. In: Tropical Ecological Systems-Trends in Terrestrial and Aquatic Research, E. Medina and EB.

Chief among these is the current inability to distinguish the plant-derived contributions from the atmospheric contributions to net throughfall. Another problem is to distinguish effects of individual air pollutants from those of other natural and pollutant stresses. Controlling for additional variation in throughfall and stemflow chemistry resulting from 'such factors as the amount, intensity, and frequency of precipitation, is yet another obstacle. 2. Throughfall Studies of Ion Movement 43 Controlled laboratory and greenhouse studies remain a good source of information for assessing the significance of accelerated leaching caused by pollutants, despite the difficulty of relating their results to field situations.

1980). Second, the reference site should not to be within a region of high background deposition. Kelly (1984) found no statistical differences in throughfall depositions between carefully matched sites that differed in distance from a power plant; he hypothesized that the lack of difference was from regionally distributed inputs which were more important than those of local origin. Finally, higher net throughfall depositions in areas close to sources could include elevated leaching of existing materials resulting from past deposition, rather than to only the washoff of materials deposited in the current dry period.

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