Liu Hua, Zhang Ji-Quan, Yuan Lin
State Key Laboratory of Estuarine and Coastal Research & Shanghai Key Laboratory of Urbanization and Ecological Restoration, East China Normal University, Shanghai 200062, China.
Ying Yong Sheng Tai Xue Bao. 2007 Dec;18(12):2870-4.
To restore submersed aquatic vegetation has been recognized as an effective measure in improving eutrophicated water bodies and reestablishing aquatic ecosystems. Remote sensing technology can be used to timely monitor the distribution and growth status of submersed vegetation on a large scale, but the suspended matter in water bodies may affect the spectral characters of submersed vegetation, resulting in an inaccuracy of the interpretation of related remote sensing images. In this study, the spectral reflectivity of submersed plant Hydrilla verticillata in the water bodies with different suspended matter concentration was measured by a ground FieldSpec Pro JR spectroradiometer, and the results showed that the spectral reflectivity of the submersed plant increased with increasing concentration of suspended matter at the band of 400-900 nm. Significant correlations were observed between the suspended matter concentration and the spectral reflectivity of H. verticillata community at the band of 400-900 nm (P < 0.05) and of 450-900 nm (P < 0.01), and a clear linear relationship was found at the wavelength bands of blue, green, red and NIR. The results obtained in this study could be used to calibrate the effects of suspended matter in water body on the spectral reflectivity of submersed vegetation, and be helpful to rapidly and accurately monitor the distribution and dynamics of submersed vegetation on a large scale with remote sensing.
恢复沉水水生植被已被认为是改善富营养化水体和重建水生生态系统的有效措施。遥感技术可用于大规模及时监测沉水植被的分布和生长状况，但水体中的悬浮物可能会影响沉水植被的光谱特征，导致相关遥感图像解释不准确。本研究采用地面FieldSpec Pro JR光谱辐射仪测量了不同悬浮物浓度水体中沉水植物黑藻的光谱反射率，结果表明，在400 - 900 nm波段，沉水植物的光谱反射率随悬浮物浓度的增加而增加。在400 - 900 nm波段（P < 0.05）和450 - 900 nm波段（P < 0.01），悬浮物浓度与黑藻群落光谱反射率之间存在显著相关性，在蓝、绿、红和近红外波段发现了明显的线性关系。本研究结果可用于校正水体中悬浮物对沉水植被光谱反射率的影响，有助于利用遥感技术快速、准确地大规模监测沉水植被的分布和动态变化。
