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首页> 外文期刊>Limnology >Echosounding observations of coverage, height, PVI, and biomass of submerged macrophytes in the southern basin of Lake Biwa, Japan
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Echosounding observations of coverage, height, PVI, and biomass of submerged macrophytes in the southern basin of Lake Biwa, Japan

机译：日本琵琶湖南部盆地沉水植物的覆盖度，高度，PVI和生物量的回声观测

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We have developed a procedure to process echosounding data to map the distribution of submerged aquatic macrophytes in the southern basin of Lake Biwa, a water body that has a surface area of 52 km2 and a mean depth of 4 m. Echosounding observations were made along 27 transect lines spaced at 500-m intervals on August 4 and September 2 and 30, 2003. Quantitative vegetation data including percent coverage, mean vegetation height, and percent vegetation infestation were directly determined using image data from the echosounder recorded digitally on videotape. Based on the image data from an echosounder, a regression model was developed for estimating biomass of submerged macrophytes. The regression model using the total echo strength as the explanatory variable could reliably estimate macrophyte biomass up to 300 g m?2. Distribution maps of macrophyte height and biomass suggest that the recent summer decline of submerged macrophytes started earlier in shallow areas (<3 m of depth) than deep areas (>4 m) in the southern basin of Lake Biwa.
机译：我们开发了一种处理回波数据的程序，以绘制淹没的水生植物在琵琶湖南部盆地的分布，该琵琶湖的水体表面积为52 km2 ，平均深度为4 m。于2003年8月4日，9月2日和9月30日沿着27条以500米为间隔的样带线进行了回声观测。利用记录的回声测得的图像数据直接确定了定量的植被数据，包括覆盖率，平均植被高度和植被侵害百分比。在录像带上进行数字化处理。基于来自回声测深仪的图像数据，开发了一个回归模型来估计淹没大型植物的生物量。以总回波强度为解释变量的回归模型可以可靠地估算高达300 g m？2 的大型植物生物量。大型植物高度和生物量的分布图表明，最近的夏季淹没大型植物的下降开始于比瓦湖南部盆地的浅区域（深度<3 m）比深区域（> 4 m）更早。

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