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Assessment of physiological state of Betula pendula and Carpinus betulus through leaf reflectance measurements

机译：通过叶片反射率评估评估西南桦和甜菜的生理状态

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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. (C) 2015 Elsevier GmbH. All rights reserved.
机译：在这项研究中，有关生理状态和叶片光学特性之间关系的证据使我们研究了桦（Betula pendula Roth）和甜菜（Carpinus betulus L）两种物种的行为，以确定植被是否受到重金属负荷的影响。罗马尼亚以前的采矿区Rosia Montana的土壤（北纬46度8'47英寸，东经23度10'15英寸）。比较了两种非破坏性技术（叶片透射率和反射率）以评估植物的生理状态，并测试了27种植被指数以评估叶片色素含量。对于叶绿素评估，反射比R-NIR / R-550和R-NIR / R-700最可靠，可准确估计叶子的色素含量。除红色绿色比率外，光利用效率（LUE）指数均在正常值范围内，表明光合作用的整体反应不会因栖息地的特定条件而受到损害。在两个研究物种之间，叶片光学特性的差异很小，植被指数的值也显示出相似的趋势。两种技术均表现良好，并能准确估算颜料含量，从而支持其互操作性。 （C）2015 Elsevier GmbH。版权所有。

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