摘要

In this study, the evidence of a relationship between the physiological state and leaf optical properties led us to investigate the behaviour of two species -Betula pendula Roth and Carpinus betulus L - in order to determine if the vegetation is affected by the heavy metal load of the soil from a former mining area, Rosia Montana, Romania (46 degrees 8'47 '' N, 23 degrees 10'15 '' E). Two non-destructive techniques (leaf transmittance and reflectance) were compared to assess the physiological state of the plants, and 27 vegetation indices for estimating foliar pigment content were tested. For chlorophyll assessment, the reflectance ratios R-NIR/R-550 and R-NIR/R-700 were the most reliable for an accurate estimation of the pigment content of the leaves. The light use efficiency (LUE) indices were within normal values, except the Red Green Ratio, indicating that the overall reactions of photosynthesis are not impaired by the specific conditions of the habitat. Differences in leaf optical properties are minimal between the two studied species and the values of the vegetation indices are showing similar trends. Both techniques performed consistently well and yielded accurate estimations of pigment content, supporting their interoperability.

  • 出版日期2015