Growth reduction of the Japanese black pine corresponding to an air pollution episode

Changes of tree-ring widths of Japanese black pine (Pinus thunbergii Parl.) trees growing in air-polluted and unpolluted areas were analyzed. In the stand close to an industrial complex, a large reduction in the series of tree-ring index (TRI), which were computed by removing endogenous effects from the measured series, appeared from the 1960s to 1970s. This reduction in radial tree growth was not explained by the climatic response model calibrated for a pre-pollution period. TRI changes corresponding with changes in concentrations of sulfur dioxide (SO2), and a significant negative correlation between the TRI and SO2 concentration were found in the polluted area. Reduction in tree-ring growth was not seen in the unpolluted area. These results indicate that the past reduction in the growth of Japanese black pine trees growing in an industrial area was mainly caused by SO2.