摘要
沉水植物的恢复是改善富营养化水体和重建水生生态系统的有效措施．应用遥感技术可以实时、大面积监测沉水植物的分布和生长情况，而水体中的悬浮物等物质影响沉水植物的光谱特征，直接影响对湖泊、河流遥感影像中沉水植物的准确解译．本研究利用地物光谱仪在室外实测了不同水体悬浮物浓度条件下沉水植物黑藻群落的光谱反射率．结果表明，在400～900nm波段，水体中悬浮物浓度越高，沉水植物的光谱反射率越大．水体悬浮物浓度与黑藻群落光谱反射率在400～900nm均为显著相关（P〈0．05），在450～900nm为极显著相关（P〈0．01）．在蓝、绿、红和近红外4个波段，将水体悬浮物浓度与其光谱反射率进行回归分析，均得到了较好的线性关系．利用本研究结果对富含悬浮物水体中沉水植物的反射光谱进行修正，可为准确、快速和大尺度遥感监测沉水植物的分布和动态提供科学依据．
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 resuits 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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第12期2870-2874,共5页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划项目(2006BAC01A14)
国家高技术研究发展计划资助项目(2006AA09Z169).
关键词
沉水植物
黑藻
悬浮物浓度
光谱反射率
地物光谱仪
submersed plant
Hydrilla verticillata
suspended matter concentration
spectral reflectivity
spectroradiometer
