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首页> 外文期刊>Wetlands >EVALUATION OF NON-DESTRUCTIVE METHODS FOR ESTIMATING BIOMASS IN MARSHES OF THE UPPER TEXAS, USA COAST
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EVALUATION OF NON-DESTRUCTIVE METHODS FOR ESTIMATING BIOMASS IN MARSHES OF THE UPPER TEXAS, USA COAST

机译：评估美国德克萨斯上海岸沼泽生物量的非破坏性方法评价

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摘要

The estimation of aboveground biomass is important in the management of natural resources. Direct measurements by clipping, drying, and weighing of herbaceous vegetation are time-consuming and costly. Therefore, non-destructive methods for efficiently and accurately estimating biomass are of interest. We compared two non-destructive methods, visual obstruction and light penetration, for estimating above-ground biomass in marshes of the upper Texas, USA coast. Visual obstruction was estimated using the Robel pole method, which primarily measures the density and height of the canopy. Light penetration through the canopy was measured using a Decagon light wand, with readings taken above the vegetation and at the ground surface. Clip plots were also taken to provide direct estimates of total aboveground biomass. Regression relationships between estimated and clipped biomass were significant using both methods. However, the light penetration method was much more strongly correlated with clipped biomass under these conditions (R~2 value 0.65 compared to 0.35 for the visual obstruction approach). The primary difference between the two methods in this situation was the ability of the light-penetration method to account for variations in plant litter. These results indicate that light-penetration measurements may be better for estimating biomass in marshes when plant litter is an important component. We advise that, in all cases, investigators should calibrate their methods against clip plots to evaluate applicability to their situation.
机译：地上生物量的估计对自然资源的管理很重要。通过修剪，干燥和称量草木植被进行直接测量既费时又费钱。因此，用于有效且准确地估计生物量的非破坏性方法受到关注。我们比较了两种非破坏性方法，即视觉障碍和光线穿透，以估计美国得克萨斯州上海岸的沼泽地上的生物量。视觉障碍是使用Robel杆法估算的，该方法主要测量顶篷的密度和高度。使用十进角测光棒测量穿过树冠的光线，并在植被上方和地面上获取读数。还使用裁剪图来直接估算地上总生物量。使用这两种方法，估计的生物量和修剪的生物量之间的回归关系都很显着。然而，在这些条件下，光穿透方法与受限制的生物量的相关性更高（R〜2值为0.65，而视觉障碍方法为0.35）。在这种情况下，这两种方法之间的主要区别在于光穿透法解决植物凋落物变化的能力。这些结果表明，当植物凋落物是重要的组成部分时，光渗透率测量可能更好地估计沼泽地中的生物量。我们建议，在任何情况下，研究人员均应根据剪辑图校准其方法，以评估其适用性。

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